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ATLAS HYDROSWEEP DS-2 - ePIC

1. ATLAS HYDROSWEEP DS 2 2 Description of the ATLAS HYDROSWEEP DS 2 Product Description Up to this point any normal multibeam echosounder would be capable of providing similar information It must however be considered that each of the individual beams because of their different alignment angles can only measure one sample of the full angular backscatter distribution of separate bottom locations It is therefore important to note that in this classical configuration the angular ambiguity cannot be resolved and hence an unbiased classification result of the full ensonified swath width cannot be calculated Figure 2 3 Backscatter ambiguity in multibeam data acquisition The ATLAS HYDRSWEEP DS 2 mills cross arrangement of transmitter and receiver transducer however allows training the normal across track orientated fan into the fore aft plane While steaming along the pre planned track line and the fan trained into the fore aft orientation at regular user selectable intervals individual backscatter samples of the depth profile underneath the track line are simultaneously taken by all depth channels eventually revealing the full angular backscatter distribution of individual bottom locations These along track scatter curves can be applied as normalisation functions to calibrate the individual across track backscatter samples to one common reference 2 3 Optimally Chosen Operating Frequency Previous deep sea echosounders had generally
2. ATLAS Hydrographic GmbH ATLAS HYDROMAP CONTROL Product Description Bremen Germany March 2002 ATLAS Hydrographic GmbH ATLAS HYDROMAP ONLINE Version 2 2 User Manual ED 1044 G 012 Bremen Germany 06 01 2001 ATLAS Hydrographic GmbH ATLAS HYDROMAP OFFLINE Version 4 2 User Manual ED 1045 G 012 Bremen Germany 02 01 2001 ATLAS Hydrographic GmbH ATLAS HYDROMAP OFFLINE Mini Version 4 2 User Manual ED 1051 G 012 Bremen Germany 03 01 2001 International Hydrographic Organization IHO Standards for Hydrographic Surveys Special Publication No 44 Monaco 4th Edition April 1998 U S Army Corps of Engineers Hydrographic Surveying EC 1130 2 210 Washington D C USA 1 October 1998 Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 7 1
3. factor At the negligible small costs of some extra soundings this method provides a stable and reliable ray bending correction for most survey conditions without the necessity to stop the vessel for any kind of time consuming profile acquisition 2 7 Motion Compensation Wide swath sonar systems with slant beam geometry are subject to significant propagation effects in the water column Thus for any high precision bathymetric multibeam echosounder Mr Ziese was a former senior development manager of ATLAS Hydrographic Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 2 10 ATLAS HYDROSWEEP DS 2 2 Description of the ATLAS HYDROSWEEP DS 2 Product Description systems an active real time beam stabilisation is an absolute prerequisite for any accurate depth measurement A full 3 axis rotational plus an additional single axis translation correction including roll pitch yaw and heave is required ATLAS Hydrographic recommends utilising either a high precision motion sensor as e g the ATLAS DYNABASE 2 05 combined with an accurate gyro or alternatively a combined instrument as the TSS POS MV for active beam steering of multibeam echosounder systems The motion sensor may simultaneously be used for real time heave correction of optionally connected single beam survey echosounders as e g the ATLAS DESO 17 the ATLAS DESO 25 or the ATLAS DESO 30 Doc Id HYD DS2 ProductDescription 1
4. HYDROSWEEP DS 2 1 Introduction Product Description 1 Introduction The worldwide constitution of National Exclusive Economic Zones EEZ focuses the nations attention on the enormous resource potential of oceanic regimes The utilisation of vast areas extending from inshore to the high seas offers a broad spectrum of technological challenges The future management of these marine resources highly depends on the availability of appropriate technologies for surveying monitoring and exploitation The ATLAS HYDROSWEEP DS 2 has been developed as a unique surveying tool for continuous and gap less acquisition of highly demanded seafloor data International Marine Research Institutions National Hydrographic Services Offshore Surveyors and Engineers as well as Environmental Agencies utilise the instrument s outstanding accuracy resolution and the wide swath width in a demanding environment The ATLAS HYDROSWEEP DS 2 multibeam echosounder utilises an enhanced preformed beam detection technology in order to overcome classical array aperture limitations A dual principle beamforming device combines traditional stabilised time delay beamforming with ATLAS Hydrographics advanced high resolution bearing discriminator a technology originally introduced with ATLAS Hydrographics shallow water multibeam echosounder system ATLAS FANSWEEP 20 Swath angles of up to 120 degrees can be achieved and resolved into up to 240 independent depth information chan
5. beams can be handled by HDBE For broadband applications the current configuration is preset to 140 nominal beams Experience with this innovative beam forming concept have been gained with a variety of different ATLAS HYDROSWEEP MD 2 and ATLAS HYDROSWEEP DS 2 system installations see for example the list of delivered ATLAS deep sea systems in chapter 6 Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 2 7 ATLAS HYDROSWEEP DS 2 2 Description of the ATLAS HYDROSWEEP DS 2 Product Description electric signal from transducer V angle time i i support beam generator v traditional beam former A a b angle ee bearing estimation A beam n time i HDBE angle amplitude time amplitude smoothing and noise reduction soft beam former en time_i gt bottom detection Figure 2 5 ATLAS HYDROSWEEP DS 2 Beamformer block diagram Figure 2 6 Support beam generation within HDBE Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 2 8 ATLAS HYDROSWEEP DS 2 2 Description of the ATLAS HYDROSWEEP DS 2 Product Description 2 6 Sound Velocity and Ray Bending The acoustic sound propagation in seawater depends on the physical parameters of the seawater i e temperature salinity and ambient pressure
6. been designed for 12 kHz operations Today modern transducer ceramics offer significantly increased receiving sensitivities The capability to reach the full ocean depth of 10 000 metres or more can therefore now be achieved with the higher 15 5 kHz frequency of the ATLAS HYDROSWEEP DS 2 Amongst the advantages narrower focussing beam patterns lower ambient noise levels and a smaller transducer design are of prime importance With 15 5 kHz a shorter near field condition is generated hence shorter pulses and more accurate signal threshold discrimination are provided Typical open ocean ambient noise levels drop at a rate of 5 to 6 dB per octave offering a higher detection probability Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 2 4 ATLAS HYDROSWEEP DS 2 2 Description of the ATLAS HYDROSWEEP DS 2 Product Description Maintaining the geometrical acoustic beam structure and alignment a 15 5 kHz transducer can be shortened by approx 2096 The seafloor backscatter coefficients are typically higher at 15 5 kHz providing better results at larger grazing angles A 12 kHz signal penetrates more easily into the bottom surface layers The quality of the return signal is compromised by this effect resulting in a reduced accuracy of the travel time and backscatter measurements The ATLAS HYDROSWEEP DS 2 has been optimised for the full application range from water depths as shal
7. effect which depending on the survey conditions always provide the user with optimally compensated bathymetric data sets All of these methods can be utilised in real time However if during the later offline processing procedure better and more accurate oceanographic information becomes available data re alignment procedures including sound velocity corrections are provided in state of the art post processing software module 1 As a first and basic approach the ATLAS HYDROSWEEP DS 2 provides access to a manual adjustment of sound velocity correction factors These factors can be derived from a variety of different sources as e g external separate sound velocity sensors see below or prediction models Quality and accuracy of such corrections are strictly within the responsibility of the operator 2 If an external sound velocity profiler is available the ATLAS HYDROSWEEP DS 3 allows interfacing such a device through interface types like e g RS 232 422 This enables the user to efficiently transfer measured profile data in near real time straight into the multibeam processor Commonly used sound velocity profilers are CTD s conductivity temperature depth probes XBTs expandable bathy thermographic probes XSVs expandable sound velocity probes and USVs continuous undulating sound velocity Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 2 9 ATLAS HYDROSWEEP DS 2 2 Description of the AT
8. ms 3 300 5 000 m 54 30 0 30 10 ms 54 16 ms Qao RDT 36 x 4 6 Water Search 1 Beam 1ms 10 400 m i05 Deep Sea RDT 36 x 2 3 Search cim 10 ms 100 12 000 m i Table 4 4 Transmission modes of the ATLAS HYDROSWEEP DS 2 for 120 swath width Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 4 6 ATLAS HYDROSWEEP DS 2 4 Technical Data of the ATLAS HYDROSWEEP DS 2 Product Description The following table describes technical data of the ATLAS HYDROSWEEP DS 2 transmitter Feature Specification Transmission source level gt 237 dB rel 1 uPa 1 m in RDT operation mode gt 220 dB rel 1 uPa 1 m in ODT operation mode Beam width longitudinal 2 3 in medium and deep sea mode 4 6 in shallow water mode Pulse length 1 60 ms depending on transmission mode Dynamic compensation Pitch and roll in RDT Pre trigger for heave compensation Table 4 5 Technical data of the ATLAS HYDROSWEEP DS 2 transmitter 4 3 Receiver Feature Specification Beam width longitudinal Approx 20 at 3dB Beam width across 0 5 to 2 3 in medium and deep sea mode 1 0 to 4 6 in shallow water mode Input Sensitivity 45 rel 1 uPa for shallow water 50 rel 1 uPa for deep water Reception directivity 23 dB for shallow water 27 dB for deep water Bandwidth 100 Hz to 1 kHz Automatically determined by the water depth range Dynamic compensation Roll Heave comp
9. profile is compensated 4 7 Calibration Mode The technical data as specified above are applicable in the survey mode In the calibration mode above specification is applicable within the following constraints The roll compensation is limited to 10 The pitch compensation is limited to 5 Accuracy values are not specified for the calibration mode The estimated standard deviation for 90 swath width is 1 96 Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 4 9 ATLAS HYDROSWEEP DS 2 4 Technical Data of the ATLAS HYDROSWEEP DS 2 Product Description The calibration mode is not executed at yaw angles gt 5 Switching to calibration mode can be accomplished in a Automatic mode depth travelled distance b Manual mode ratio between longitudinal and transversal soundings 4 8 Operational Conditions The depth ranges accuracies and related technical data as specified above are valid under the following operational conditions Isotropic noise level in deep water lt 45 dB rel 1 uPa Hz Isotropic noise level in shallow water lt 60 dB rel 1 uPa Hz Roll angle Less than 10 degrees Pitch angle Less than 5 degrees Continuously uninterrupted ray path Undisturbed acoustic contact between the water and the radiating transducer surface no air bubbles beneath the transducers 4 9 Environmental Conditions Parameter Range Temperature of underwater 3
10. 5 C maximum parts incl cables 4 C minimum Temperature of electronic 40 C maximum average unis 50 C peak 0 C minimum Humidity Max 95 no condensation Vibrations 0 35 g maximum at 0 100 Hz Table 4 10 Environmental conditions for the ATLAS HYDROSWEEP DS 2 COTS components such as PCs workstations printers plotters magnetic storage devices and storage media shall expose to environmental conditions according to manufacturer s specifications It is recommended to provide an office type environment for the computer hardware and associated peripherals Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 4 10 ATLAS HYDROSWEEP DS 2 4 Technical Data of the ATLAS HYDROSWEEP DS 2 Product Description 4 10 Equipment Dimensions and Weights Equipment Height Width Front to back Weight Transmitter cabinet 1 2180 mm 750 mm 420 mm 212 kg Type SH 6020 A 001 Transmitter cabinet 2 2180 mm 750 mm 420 mm 212 kg Type SH 6020 A003 Signal processing cabinet 1950 mm 600 mm 600 mm 142 kg Type GE 6012 A 007 Interface Processor cabinet 500 mm 670 mm 500 mm 50 kg Type GE 6028 O 300 Transducer array incl cable 350 mm 2839 mm 300 mm 393 kg longitudinal Transducer array incl cable 350 mm 2839 mm 300 mm 393 kg transversal Operator station and peripheral devices Depending on the individual system configuration Table 4 11 Equipment dimensions and weig
11. 6c doc Edition 05 2003 Version 1 2 Status Final 2 11 ATLAS HYDROSWEEP DS 2 3 System Operation and Echosounder Control Product Description 3 System Operation and Echosounder Control Under most survey conditions the ATLAS HYDROSWEEP DS 2 provides fully automatic bottom tracking without any operator intervention being necessary It automatically adjusts the operating mode deep or shallow water the gain the transmission voltage and the range dependent parameters as required The results of the echo evaluation are transferred into a second independent dual CPU processor controlling all internal operations and being responsible for the complete timing External sensors and data sources as there are the ship s navigation system and the roll pitch and heave sensor platform are connected The measured depth profiles are assembled together with the corresponding external information into a common data record Upon completion of each data acquisition and evaluation cycle this record is transferred to the operator station via a local area network LAN connection The ATLAS HYDROSWEEP DS 2 multibeam echosounder can be operated with different types of software packages for measurement data acquisition data storage and data processing The possible solutions are described below 3 1 Operation with the ATLAS HYDROMAP ONLINE On one hand it is possible to operate the ATLAS HYDROSWEEP DS 2 via the well proven ATLAS HYDROMAP ONLINE soft
12. ATLAS HYDROGRAPHIC Product Description ATLAS HYDROSWEEP DS 2 Hydrographic Deep Sea Multibeam Echosounder Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final ATLAS HYDROSWEEP DS 2 Change Log Product Description Table of Contents 1 INTRODUCTION ceresna 11 rati cuero Er eu Eee o Ei eua co Eu eu Pau i cave een fate te ence eres Pato e eeu 1 1 2 DESCRIPTION OF THE ATLAS HYDROSWEEP DS 2 eere 2 1 2 1 GENERAL mc Tum RD 2 1 2 2 BACKSCATTER DATA FOR SEABED CLASSIEICATION eere mener rne 2 3 2 3 OPTIMALLY CHOSEN OPERATING FREQUENCY ccoocccncconccnncconcconcconcconcconeconcconeconeconecenens 2 4 2 4 OPEN FRONT END TECHNOLOGY 2 5 2 5 MODULAR RECEIVER CONCERT 2 5 2 6 SOUND VELOCITY AND RAY BENDING RII emen rne ree tenet rne trn teret nennen 2 9 2 7 MOTION COMPENSATION nn nn nene rn nn enn enn EEEE PEERAA nErenn 2 10 3 SYSTEM OPERATION AND ECHOSOUNDER CONTROL eren 3 1 3 1 OPERATION WITH THE ATLAS HYDROMAP ONLINE emm HH 3 1 3 2 OPERATION VIA ATLAS HYDROMAP CONTROL Reemi 3 3 3 3 DATA POST PROCESSING eme E a iL eria Aa ai aineen rre rris 3 7 4 TECHNICAL DATA OF THE ATLAS HYDROSWEEP DS2 enm 4 1 4 71 GENERA ene EE Nen Ure o i e ATES ora iden BOTS grt iade itn vo 4 1 Ay TBRANSMIETER 2 252 Arc a eee altas 4 4 2 3 IBREGEIVER A nn nn nen ee Dann T e Io dt rl tte se PEST 4 7 4 4 BEAMFORMER AND BOTTOM DETECTI
13. Both signal amplitudes and directional spreading are affected As under normal environmental conditions oceans are stratified media Both speed and directional variations of sound propagating through such an environment under oblique angles can be observed The directional changes are commonly referred to as ray bending effects E Lat 60 00 313 N Planning Speed 4 10 kt DGPS ir 7 Tine 09 42 11 UIC Y Lon 024 58 539 E WGS84 Course 156 0 ROT 7 fmin Date 12 08 97 UTC x r IIT v 1 Survey HORA Contigure C Values C m s 1905 Depth x C Sources C Keel Man C Profile x S C Mean Man C Protile Actual C Data C Keel ms 1490 8 C Mean ms 1442 5 Man Profile Inordsee Manual C Data C Keel m s 1500 0 C Mean ms 1500 0 Manual C Profile y Delete Acquired at 01 01 70 00 00 00 Edit New Delete A V SVP C Profile hr ea th ego e 5 E XE Edi Show n Xy Si N oza ale 000 AA motns ES boo e P3 095204 Ass Am 1 e e t P R iPsus Prote Prot Select Reverse S N E W iAuto Event wins R R Ee JVRM a EBM REL Se v 3 0 WA Set Center Default Brightness Tree Menu Help Figure 2 7 Typical sound velocity profile as observed during an ATLAS HYDROSWEEP DS 2 survey The ATLAS HYDROSWEEP DS 2 offers four different approaches to compensate for this propagation
14. Expandable Bathy Thermographic Probe XDR External Data Representation XSV Expandable Sound Velocity Probe Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 5 1 ATLAS HYDROSWEEP DS 2 Product Description 6 Delivered ATLAS Deep Sea Systems 6 Delivered ATLAS Deep Sea Systems Delivery System Vessel Customer Country Date s Type RV METEOR Bundesministerium f r Germany 1986 1995 DS 2 Forschung und Technologie RV Alfred Wegener Institut AW1 Germany 1989 1997 DS 2 POLARSTERN Bremerhaven 120 ORV SAGAR National Institute of India 1989 DS KANYA Oceanography Goa RV MAURICE Lamont Doherty Earth USA 1989 2001 DS 2 EWING Observatory Palisades 120 HDBE RV THOMAS US Navy USA 1990 DS THOMPSON University of Washington Seattle RV HAKUREI Metal Mining Agency Japan 1991 2000 DS 2 MARU II Tokyo RV SONNE Reedereigemeinschaft Germany 1991 DS Forschungsschifffahrt Bremen RV L ESPOIR Svitzer Ltd Britsurvey United 1994 1998 DS 2 Great Yarmouth Kingdom 2002 120 HDBE WFS PLANET TNSW Emden Germany 2003 DS 2 120 HDBE AKADEMIK Russian Academy of Sciences Russia 2003 DS 2 BORIS RAS Moscow 120 PETROV HDBE Table 6 1 Delivered ATLAS HYDROSWEEP DS and DS 2 deep sea systems Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 6 1 ATLAS HYDROSWEEP DS 2 7 References Product Description 7 111 12I BI 14I EI 6 References
15. LAS HYDROSWEEP DS 2 Product Description probes These oceanographic probes have to be lowered into and through the water column The user can choose between memory logging and cable connected configurations CTD s require the ship to stop while conducting the vertical sound velocity profile acquisition At typical winch speeds of 1 metre per second a Mid Atlantic station at 5 000 metres would take 10 000 seconds or 2 hours 47 minutes plus handling off the valuable ship s and survey time Both XBTs and XSVs can be dropped while sailing at normal survey speed without any risk of interference with the acoustic survey activities However both probe types are designed as a one time non recoverable item which after full wire length has been paid out snap off the connection and drop to the seafloor Thus additional operating costs of depending on the chosen model 60 US to 120 US per profile must be added to the overall survey costs an additional financial burden which under certain oceanographic conditions like e g in coastal and or shelf areas might become a quite significant subject USVs are tow fish based continuous profilers undulating between preset minimum and maximum depth values Technically these systems offer perfect control over the acoustic propagation conditions however their high procurement costs as well as their limiting effects on ship s manoeuvrability must be considered upfront 3 Both in many shelf areas
16. ON ALGORITHM enne emere 4 8 4 5 PARAMETER RANGES FOR MOTION COMPENSATION 0oocconcconcconcconcconcconcconcconeconcconeconess 4 8 4 6 RESOLUTION AND ACCURACY ecce emen eee tene rne ese rre nennen rre rne reet rennen 4 9 A 7 GALIBRATION MODE EE esci to ER Exec E ERO reiche ceed ben ERO reed 4 9 4 8 OPERATIONAL CONDITIONS oocconcconccnnccnnccnncnnnccnnncnnnonnnnnnnnnn nn rn n rn nen rn EEEE EEEE E EEEn 4 10 4 9 ENVIRONMENTAL CONDITIONS uuansnnnnnennnennnnnnnennnennnennnennnennnnnnnnnnnnnnnennnnnnne nennen 4 10 4 10 EQUIPMENT DIMENSIONS AND WEIGHT 4 11 441 POWER SUPPLY ar ee ne ee ER 4 11 5 ABBREVIATIONS 1 orari sa cod eod ie ioa p ege et Sege Nee ege See sue 5 1 6 DELIVERED ATLAS DEEP SEA SYSTEMS ccccceecceecceecceeceeeccesceeeceeeeeeseeeeeees 6 1 7 REFERENCES beis e ee 7 1 Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final ii ATLAS HYDROSWEEP DS 2 Change Log Product Description CHANGE LOG Version CHANGES Author s Date 1 0 lnitial version based upon an existing Ch Zwanzig 25 04 2002 product description from Holger Klindt 1 1 Change of ATLAS Hydrographic Logo S Birnstiel 01 03 2003 1 2 Revision and completion of technical data UI L tticke 23 05 2003 1 2 1 final minor changes S K nnecke 07 10 2003 Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final ATLAS
17. P DS 2 4 Technical Data of the ATLAS HYDROSWEEP DS 2 Product Description Operation Mode Transmissio A Range Directions approx Length n Mode Shallow ODT 90 x 4 6 Medium RDT 4ms 90 x 2 3 Depth 3B 2ms 100 1 000 m De I eams A mis 27 0 27 Deep Sea 12 ms 90 x 2 3 rt som 800 3 700 m oe 12 ms 30 0 30 Deep Sea II 24 ms 90 x 2 3 a Beams 12ms 3 300 11 000 m a 21 ms 30 0 30 Shallow 36 x 4 6 Water 4 u 1 ms 10 400 m gt Search 0 Deep Sea RDT 36 x 2 3 Table 4 3 Transmission modes of the ATLAS HYDROSWEEP DS 2 for 90 swath width Ranges are nominal the actual switching is automatically controlled by various parameters Nominal values Doc Id HYD DS2_ProductDescription_16c doc Edition 05 2003 Version 1 2 Status Final 4 5 ATLAS HYDROSWEEP DS 2 4 Technical Data of the ATLAS HYDROSWEEP DS 2 Product Description Operation Pulse Mode Transmissio enath Range Directions approx n Mode eng Shallow ODT 120 x 4 6 Water 1 Beam 1 ms 10 100 m 0 Medium 4ms i Depth II RDT 3ms 120 x 2 3 5Beams 28 100 450 m 2540 27 0 27 3 ms 54 4ms Medium 6ms 5 A Depth III RDT 4ms 120 x 2 3 5Beams SMS 400 1 000 m 54 27 0 27 4 ms 54 6 ms 12 ms Deep Sea III mm RDT 5ms 5 Beams 4 ms 800 3 700 m 54 30 0 30 8 ms 54 12 ms 16 ms Deep Sea IV 120 x 2 3 RDT 10 ms 5 Beams 8
18. Receiver 2 3 e 20 Today modern inexpensive data acquisition systems do provide the necessary means to keep and handle the full envelope signal for all acoustic beams see example below taken by an ATLAS HYDROSWEEP DS 2 Figure 2 4 Full coverage memory image of sonar buffer of ATLAS HYDROSWEEP DS 2 The ATLAS HYDROSWEEP DS 2 provides advanced signal processing techniques offering superior system performance The algorithms implemented in the ATLAS HYDROSWEEP DS 2 include a combination of a classical time delay Beamformer technique and a so called High Definition Bearing Estimation HDBE in order to achieve very high depth resolution in the across ship direction The acoustic raw signals are picked up by the pre amplifier signal conditioner and fed into a coarse time delay Beamformer This however only serves as an initial preformed beam conditioner The raw beam time series comprises unbiased unmasked full length envelope data each one representing the beam oriented signal trace for the full sounding cycle HDBE is based on the information provided by the classical time delay Beamformer i e the amplitude time series from each beam The per beam amplitude information is analysed to arrive at an angular information of the incoming sound wave that is of a much higher resolution than the angular information derived from the beam pattern alone Using a priori knowledge of the beam directivity pattern the amplitude ratio between adjac
19. as well as in the abyssal planes the variations in bottom topography can be described by means of a simple stationary stochastic process The ATLAS HYDROSWEEP DS 2 utilises this fact to calculate the mean sound velocity in the water column by means of a statistical analysis of a subset of subsequent cross profiles 4 The Cross Fan Calibration Method is based upon the ATLAS Ziese Principle a unique and patented acoustic method for a near real time sound velocity assessment This method is based on the symmetrical transmit and receive beam pattern of the ATLAS HYDROSWEEP DS 3 With the multibeam fan trained into the fore and aft plane an in situ acoustic assessment of the ray bending effect under the given oceanographic conditions can be carried out This method as compared to normal oceanographic profile measurements becomes a highly efficient survey tool especially under deep sea conditions with no separate ship s time required This unique patented method can save between 3 and 6 hours of ship s time every day While steaming along the pre planned track line and the fan trained into the fore aft orientation at regular user selectable intervals all depth channels simultaneously take individual samples of the depth profile underneath the track line Comparing all of these measurements of the same bottom profile however taken under different beam angles in a robust least square estimator does provide a best fit mean sound velocity correction
20. depending on the actual working depth utilises nine different transmit modes The system software depending on the water depth and the coverage selected by the operator automatically selects these In the RDT modes all transmit pulses are sent out with minimum time spacing relative to each other so that the overall sounding rate is kept at the optimum Common to all RDT modes is the roll and pitch stabilisation This ensures a maximum transmit energy under all conditions and consequently projects stable footprints at the seafloor the prerequisite for high signal to noise ratios and corresponding superior data quality At reception time because of the chosen wide receiving beam width in the fore aft direction approx 20 a pitch stabilisation is not required The following tables summarise the available operation and transmission modes for Survey and Calibration soundings Operation Mode Transmission Mode No of Coverage Beams Shallow Water Search ODT 1 36 at 3 dB Deep Sea Search ODT 1 36 at 3 dB Shallow Water ODT 1 120 at 5 dB Medium Depth RDT 3 90 at 3 dB Medium Depth RDT 5 120 at 5 dB Deep Seal RDT 5 120 at 5 dB Deep Sea Il RDT 3 90 at 3 dB Table 4 2 Operation modes of the ATLAS HYDROSWEEP DS 2 overview ODT Omni Directional Transmission RDT Rotational Directional Transmission Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 4 4 ATLAS HYDROSWEE
21. e vertical water depth the achievable coverage depends on the acoustic conditions please find more details enclosed Equal footprint or equal angle 2 3 15 5 kHz 10 0 m below the transducers gt 11 000 m The maximum detectable depth depends on the acoustic conditions please find more details enclosed 120 3 7 x water depth 10 to 4 700m 90 2 0 x water depth 10 to 8 000 m 60 1 5 x water depth 10 to 11 000m The actual achievable swath width depends on the acoustic backscatter properties of the seafloor and the water sound velocity profile on the roll conditions survey mode and the pitch conditions calibration mode of the vessel For details see the following figures General technical data of the ATLAS HYDROSWEEP DS 2 Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 4 1 ATLAS HYDROSWEEP DS 2 4 Technical Data of the ATLAS HYDROSWEEP DS 2 Product Description 10000 8000 6000 4000 2000 Depth m Coverage m 2000 4000 6000 18000 10000 Figure 4 1 Range performance of the ATLAS HYDROSWEEP DS 2 for typical silt sediments Backscatter coefficients
22. ensation by geometrical correction of depth output Table 4 6 Technical data of the ATLAS HYDROSWEEP DS 2 receiver Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 4 7 ATLAS HYDROSWEEP DS 2 4 Technical Data of the ATLAS HYDROSWEEP DS 2 Product Description 4 4 Beamformer and Bottom Detection Algorithm Feature Specification Beam forming principle 2 stage Beamformer structure with Primary coarse stabilised time delay Beamformer Secondary fine high resolution bearing discriminator HDBE Primary acoustic channels 59 coarse channels Depth channels Up to 240 Bottom detection The HYDROSWEEP DS 2 evaluates individual acoustic travel times by means of synchronised amplitude and phase detection with interlaced centre of energy and high resolution bearing discrimination computation with automatic adaptive gate control A subsequent series of advanced plausibility filters increases the ability of unambiguous bottom target detection Table 4 7 Technical data of the ATLAS HYDROSWEEP DS 2 Beamformer and bottom detection algorithm 4 5 Parameter Ranges for Motion Compensation Parameter Range Roll angle 10 for 120 swath width 14 for 90 swath width Pitch angle 10 Heave 5m Table 4 8 Parameter ranges for the ATLAS HYDROSWEEP DS 2 motion compensation Input Scaling roll 0 4444 VI pitch 0 4444 v heave 2 0 V m Max input voltage 10V Doc Id HYD DS2 ProductD
23. ent beams is computed and an across fan arrival angle of the incoming wave is deduced The ATLAS HYDROSWEEP DS 2 uses the knowledge of the beam pattern together with the per beam amplitude information to generate an amplitude angle trajectory in travel time Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 2 6 ATLAS HYDROSWEEP DS 2 2 Description of the ATLAS HYDROSWEEP DS 2 Product Description space This trajectory is used to generate a number of so called soft beams that are used in conjunction with the hard beams to arrive at an improved angular resolution of the bottom The following processing steps are carried out see also figure 2 5 The per stave data from the transducer is processed in a classical time delay Beamformer The per beam amplitude information is smoothed and noise is reduced with a noise reduction algorithm A number of arithmetic support beams are generated From the amplitude information of the soft beams the angle and amplitude function is computed The individual amplitude angle information is associated with the corresponding soft beams The per beam information off the soft beams is used to detect the bottom using a weighted soft beam approach Where no information on the bottom could be gained through HDBE the depth is detected using the hard beam patterns Considering the required accuracy and the actual signal to noise ratio between 120 and 240
24. escription 16c doc Edition 05 2003 Version 1 2 Status Final 4 8 ATLAS HYDROSWEEP DS 2 4 Technical Data of the ATLAS HYDROSWEEP DS 2 Product Description 4 6 Resolution and Accuracy The resolution and accuracy characteristics of the ATLAS HYDROSWEEP DS 2 sensor operated in the survey mode are listed in the table below It has to be mentioned that the accuracy of an entire surveying system including an ATLAS HYDROSWEEP DS 2 is not identical to the accuracy of the ATLAS HYDROSWEEP DS 2 sensor because it includes additional error sources coming from the motion sensor the applied sound velocity probe and other sensors Parameter Value Depth resolution 0 1m for 10 999 m water depths im for water depths gt 999 m Side scan resolution Up to 6 kB samples per sounding cycle Typical standard deviation of 0 596 for 120 swath width EES lt 0 3 for 90 swath width for the depth range from 100 m to the maximum water depth Standard deviation of the 0 5 dee e for the depth range from 100 m to the maximum water V depth calibration Table 4 9 Resolution and standard deviation of an ATLAS HYDROSWEEP DS 2 Remark The values stated are expected values in normal survey situations and in the absence of adverse bottom or environmental conditions Due to the longitudinal swath calibration method the overall accuracy includes systematic and stochastic errors of the sensor A possible bias due to any unknown sound velocity
25. etween shallow and deep water and smooth or rough bottom and the like but they also provide a unique flexibility for future application variations e g backscattering analysis where the changes of operation parameters could then be performed by external commands which would override the standard parameters e g TVG start depth TVG gain factor or longitudinal fan transmission calibration mode 2 5 Modular Receiver Concept The ATLAS HYDROSWEEP DS 2 transducer array includes separate transmitter and receiver arrays each one consisting of 3 modules of 8 12 individual acoustic elements The original ATLAS HYDROSWEEP DS Beamformer had been designed as a straight forward time delay Beamformer with orthogonal 90 envelope sampling and an effective 62 kHz sampling rate per beam Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 2 5 ATLAS HYDROSWEEP DS 2 2 Description of the ATLAS HYDROSWEEP DS 2 Product Description A bottom tracking controlled echo processor was fed by the digitised envelope data An iterative weighting estimator calculated the echo s centre of energy straight from the online raw data and converted these into the acoustic travel times for each individual acoustic beam Due to limited capabilities of real time data acquisition systems in 1985 except for the travel times no acoustic envelope data were kept The resulting beam pattern parameters were Transmitter 90 e 2 3
26. f 240 depth channels High resolution 2 D seafloor imaging with up to 6 kByte samples per sounding cycle Full 3 D sonar imaging of the ensonified water column Acoustic measurement of sound velocity distribution for real time ray correction Calibrated bottom backscatter analysis providing seafloor sediment classification Look ahead acoustic navigation for scientific station planning 2 2 Backscatter Data for Seabed Classification For each of the acoustic beams the ATLAS HYDROSWEEP DS 2 acquires both the acoustic echo travel times as well as the corresponding signal amplitudes These raw amplitudes however are the result of a complex convolution of the following characteristics and transfer functions Transmit signal time series Acoustic and electric transducer transfer functions Sea water propagation transfer function Seafloor scatter function Receiver transfer function In order to provide all necessary data for conversion of the measured relative amplitudes into absolute acoustic signal levels which is necessary for backscatter calculations the ATLAS HYDROSWEEP DS 2 measures all electric and acoustic system parameters as e g Transmit frequency Acoustic source level Transmit pulse length Acoustic transmitter beam pattern Acoustic receiver beam pattern Receiving voltage response Constant and time variable gain settings Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 2 3
27. ferent types of parameter sets can be saved for later usage In order to apply a saved parameter set it has to be loaded into the user interface Additionally it is possible to export individual parameter sets of different types from the internal database into files and to import individual parameter sets from files into the database This feature is relevant for exchange of parameter sets between different instances of ATLAS HYDROMAP CONTROL and also for backup and restores purposes Within ATLAS HYDROMAP CONTROL different users with different permissions can be administrated All users with administration permission are able to create new user accounts to delete existing user accounts and to modify the permission rights of existing accounts Within ATLAS HYDROMAP CONTROL access rights for administration installation survey control and monitoring can be assigned to each user account independently and individually 3 3 Data Post Processing The high quality data collected by the ATLAS HYDROSWEEP DS 2 are the basis for a complete description of the seabed This is for example possible in the form of charts 3 D displays combined bathymetry and acoustic imagery or backscatter analyses seabed classification ATLAS Hydrographic is able to deliver a complete set of products for the post processing not only of ATLAS HYDROSWEEP DS 2 data but also for all data collected with other sensors of the ATLAS Hydrographic multibeam and single beam echosou
28. hts nominal values of the ATLAS HYDROSWEEP DS 2 4 11 Power Supply Parameter Range Operating voltage 230 V 10 single phase or 115 V 10 single phase Frequency 47 63 Hz Total power consumption 5 kVA 7 kVA depending on configuration Type of fuse in main 16 A slow blow 230 V switchboard No of separate fuses 6 min Table 4 12 Power supply requirements for the ATLAS HYDROSWEEP DS 2 Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 4 11 ATLAS HYDROSWEEP DS 2 5 Abbreviations Product Description 5 Abbreviations ATLAS ATLAS Hydrographic CORBA Common Object Request Broker Architecture COTS Commercial Off The Shelf CTD Conductivity Temperature and Depth Probe DESO Depth Sounder DS Deep Sea DTM Digital Terrain Model ECDIS Electronic Chart Display and Information System EEZ Exclusive Economic Zone GPS Global Positioning System HDBE High Definition Bearing Estimation IHO International Hydrographic Organisation kB Kilobyte kHz Kilohertz LAN Local Area Network MB Megabyte MD Medium Depth NMEA National Marine Electronics Association ODT Omni Directional Transmission OSF Open Software Foundation PC Personal Computer RDT Rotational Directional Transmission SP Special Publication SQL Structured Query Language TPE Total Propagated Error TVG Time Variable Gain USACE U S Army Corps of Engineers USV Continuous Undulating Sound Velocity Probe XBT
29. in a sector of 120 degrees Each of the illuminated bottom elements contributes to the total echo trace with a specific signal containing information about position and characteristic features of that particular bottom location Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 2 2 ATLAS HYDROSWEEP DS 2 2 Description of the ATLAS HYDROSWEEP DS 2 Product Description Upon return of the full bottom echo the backscattered sound signal is received by an array of hydrophone elements The output signals are corrected for differences in the individual receiving characteristics and amplified to a standard calibrated level by means of individually adjusted preamplifiers These circuits are closely mounted to the hydrophones Thus a high signal to noise ratio is maintained throughout the complete electronic system Digitally controlled Time Variable Gain TVG amplifiers subsequently correct for acoustic transmission losses The properly adjusted analogue signals are sampled and then digitised by analogue to digital flash converters A preformed beam analysis combined with the new ATLAS high resolution bearing discriminator High Definition Bearing Estimation HDBE allows sorting the information into up to 240 small pencil like acoustic detection elements The corresponding amplitude and phase data from each of these channels are subsequently converted into Precise bottom bathymetry with a maximum o
30. low as 10 metres down to more than 10 000 metres A successful customer record gives impressive evidence for the correctly chosen system parameters see chapter 6 2 4 Open Front end Technology The ATLAS HYDROSWEEP DS 2 has been designed with a very flexible transmitter and receiver front end in order to support a number of standard system functions and to be open for additional user applications now or in the future The major differences to other multibeam systems are four fold 1 Transmitting and receiving transducers are of identical construction 2 The connection between the transducers and the transmitting receiving amplifiers is performed via processor controlled switches These two features are primarily required for the patented Cross Fan Calibration Method but they are also providing a unique computer control capability of the direction of sound emission and reception either along or across the vessel s axis 3 The transmitter is capable to energise the transducers either in the ODT or in the RDT mode with roll and pitch stabilised directivity 4 The receiver is with the exception of the pre amplifiers and TVG amplifiers built up completely in digital technology The digital controlled Time Variable Gain TVG can be overridden via the system operator station workstation or PC The latter two features are primarily designed for optimising the hydro acoustic functions to cope with the conditions differing b
31. m Detailed information concerning the ATLAS HYDROMAP ONLINE can be found in reference 2 Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 3 1 ATLAS HYDROSWEEP DS 2 3 System Operation and Echosounder Control Product Description 07 29 58 UTC 08 08 97 UTC Presentation Survey Data Display Settings Start Depth m 20 00 Increment m I 1 00 Fill List Copy to Isolines Reset AER 1Pous Prot Prot sene norem ale Auto Event WINS 48 8 _ EHI SNO 4VRM a EBM REL Set v 0 50 NM A SetCenter Det Brightness Tee Meu Hep Figure 3 1 Visualisation within the ATLAS HYDROMAP ACQUIRE software module Right Side Range ba m Quantity fo Left Side Range 120 0 m Quantity bh Options Alternating Direction Additional Waypoints Distance m LH M Edi Figure 3 2 Visualisation within the ATLAS HYDROMAP NAVIGATE software module Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 3 2 ATLAS HYDROSWEEP DS 2 3 System Operation and Echosounder Control Product Description 3 2 Operation via ATLAS HYDROMAP CONTROL On the other hand it is possible to use non ATLAS software products for measurement data acquisition data storage and data processing In this case the ATLAS HYDROSWEEP DS 2 is controlled by a software applicati
32. ms User Name Transmission Alarms Logged in Since m Messages Figure 3 3 Main Window of ATLAS HYDROMAP CONTROL ATLAS HYDROMAP CONTROL is based upon a client server architecture including a CORBA link CORBA Common Object Request Broker Architecture for the communication between the ATLAS HYDROMAP CONTROL clients and the ATLAS HYDROMAP CONTROL server The server includes the object relational database Because of the client server architecture it is possible to run several instances of ATLAS HYDROMAP CONTROL on separate PCs with respect to the same echosounder to be controlled This feature is helpful for echosounder remote control or when it shall be possible to control an echosounder from different places on a ship Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 3 4 ATLAS HYDROSWEEP DS 2 3 System Operation and Echosounder Control Product Description Control ATLAS HYDROSWEEP DS 2 Sensor nl x Transmitter Receiver Signal Processing Bathymetry Sidescan Save Load m Bathymetric Coverage gt r Across Beam Distance C Keel Unit C Equal Angle ManualCKeel m s C Unit m f Equal Spacing C Keel Accuracy NEN m s Port 200 m C C Keel Sensor Starboard 200 2i m Resolution Across 5m 3500 m No of Beams ke C Beam Distance I m ME mtm Port 600 iz Manual C Mean hz m s Starboard 100 2 2 Resolution Al
33. nder family One possible product for the post processing of data from the ATLAS HYDROSWEEP DS 2 multibeam echosounder is the ATLAS HYDROMAP OFFLINE see reference 3 The ATLAS HYDROMAP OFFLINE consists of the modules MANAGE EDIT and CARIS and covers an extensive functional spectrum including among others functions for data editing and data cleaning data conversion DTM calculations 2 D and 3 D visualisations side scan viewing backscatter calculations and the generation of final chart products Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 3 7 ATLAS HYDROSWEEP DS 2 Product Description 4 Technical Data of the ATLAS HYDROSWEEP DS 2 4 Technical Data of the ATLAS HYDROSWEEP DS 2 In the following basic technical data of the ATLAS HYDROSWEEP DS 2 are provided ATLAS Hydrographic reserves the right to alter the technical data of the ATLAS HYDROSWEEP DS 2 to similar or better standards without further notice 4 1 General Feature Transmission principle Reception principle Scanning angle Beam spacing across Beam spacing longitudinal Operating frequency Minimum depth Maximum vertical depth Swath width Table 4 1 Specification Stabilised directional full swath transmission fan Stabilised directional preformed beam reception with high resolution bearing discriminator HDBE 120 corresponding to a coverage swath width of 3 5 times th
34. nels ATLAS HYDROSWEEP DS 2 has been designed to meet the following performance characteristics The range to include all world oceans independent of their specific boundary conditions i e depths from shallow shelf regions all the way down into the abyssal plains and deep oceanic trenches The coverage to provide utmost operational efficiency With its horizontal T type transducer array the ATLAS HYDROSWEEP DS 2 provides coverage of up to 120 degrees The accuracy to comply with Hydrographic standards as specified by the International Hydrographic Organisation Special Publication No 44 see reference 5 The ATLAS HYDROSWEEP DS 2 achieves full SP44 compliant data accuracy within swath widths of typically 2 to 3 times the water depth The angular resolution to provide a maximum of operational and scientific value for a wide variety of applications from object search and detection to route surveys The ATLAS HYDROSWEEP DS 2 achieves up to 240 depth data per swath Acoustic footprints can be arranged in either an equal footprint or an equal angle pattern in order to adapt to specific survey conditions The efficiency to support the operator from the initial investment phase through to the full instruments life cycle with innovative solutions to minimise its procurement and installation costs while simultaneously offering superior operational capabilities in a highly demanding commercial and technical environment With its symme
35. on called ATLAS HYDROMAP CONTROL see reference 1 ATLAS HYDROMAP CONTROL is a state of the art software product for the operational control of all ATLAS echosounders running on PC platforms with Windows NT 2000 or higher or Linux 7 3 or higher ATLAS HYDROMAP CONTROL does not include measurement data acquisition Therefore ATLAS HYDROMAP CONTROL is usually installed together with external software packages for data acquisition and data processing e g ATLAS HYDROMAP NT However it is of course possible to install ATLAS HYDROMAP CONTROL alone on a PC platform This is useful when special PC platforms shall be dedicated only for echosounder control but not for measurement data acquisition Besides all functions specific for the control of an ATLAS echosounder ATLAS HYDROMAP CONTROL provides the following functionality Graphical presentations Total quality control Logging of all user transactions and system messages Storage import and export of different types of parameter sets TPE calculations TPE Total Propagated Error Alarm generation User administration ATLAS HYDROMAP CONTROL includes an internal object relational SQL database in which the following information is stored Predefined sensor definition parameter sets for most of the commercially available sensors belonging to an echosounder system Predefined sensor control parameter sets for different surveying situations Predefined quality control parameter se
36. ong CMean Accuracy ms 100 1200 Max Ping Rate 175 C Sensor C Mean Calculation J Swath Distance m Transmission State m Current Sensor Control Parameter Set Modification State C Remote Loaded Set a eus JE Help Apply Cancel dh Figure 3 4 Tab Bathymetry of the Control ATLAS HYDROSWEEP DS 2 Sensor window When different instances of ATLAS HYDROMAP CONTROL have been installed on different PC platforms the ATLAS HYDROMAP CONTROL server including the internal database is installed only on one PC platform in order to avoid redundancies in data storage As a measure for total quality control of an entire surveying system ATLAS HYDROMAP CONTROL logs all relevant system events with an exact time stamp in the internal database These events include all user operations which influence the measurement data quality In this context every change in the echosounder parameters is stored including the time of change the values of the changed parameters and the user who performed the change Also all system messages alarms error messages and warnings which are internally generated by the system in reaction of alarms or peripheral malfunctions are stored in the system log For an inspection of the system log ATLAS HYDROMAP CONTROL provides a special View Log window Within this window it is possible to specify filter parameters including a time range the echoso
37. opography detection Precisely synchronised amplitude and phase sampling followed by advanced real time signal plausibility filters provide the basis to reach the projected performance and quality requirements and increase the ability of unambiguous bottom target detection This unique patented technique enables the system to train the normal multibeam fan around its vertical axis from the normal across track orientation into the for aft plane This re alignment offers a three fold advantage over conventional multibeam echosounders Mean sound velocity calibration for real time ray bending corrections Angular bottom backscatter calibration for reliable bottom type classification Forward looking acoustic navigation for scientific station planning Figure 2 1 Sonar diagram of an ATLAS HYDROSWEEP DS 2 Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 2 1 ATLAS HYDROSWEEP DS 2 2 Description of the ATLAS HYDROSWEEP DS 2 Product Description High Resolution Bottom Imager 3 D Volume System Master High Definition Bearing Estimator 2 nd stage Beamformer Hydrosweep Master Control us Pre coarse Beamformer Multiplexer a 3 s E S E 5 ES Transmitter TVG Amplifier Generator Transmitter Recewer iransmitter receiver Figure 2 2 Functional block diagram of the ATLAS HYDROSWEEP DS 2 The ATLAS HYDROSWEEP DS 2 ensonifies the seafloor with
38. ranging from 12 dB near nadir to 25 dB at 30 degrees grazing angle Assumed isotropic noise levels ranging from 45 dB rel 1 uPa Hz to 60 dB rel 1 uPa Hz Pulse length 12 20 ms Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 4 2 ATLAS HYDROSWEEP DS 2 4 Technical Data of the ATLAS HYDROSWEEP DS 2 Product Description 10000 Sy 18497 esl 8000 6000 4000 2000 Depth m Coverage m 2000 4000 6000 8000 10000 Figure 4 2 Range performance of the ATLAS HYDROSWEEP DS 2 for typical clay sediments Backscatter coefficients ranging from 25 dB near nadir to 33 dB at 30 degrees grazing angle Assumed isotropic noise levels ranging from 45 dB rel 1 uPa Hz to 60 dB rel 1 uPa Hz Pulse length 12 20 ms Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 4 3 ATLAS HYDROSWEEP DS 2 4 Technical Data of the ATLAS HYDROSWEEP DS 2 Product Description 4 2 Transmitter In order to reach the desired system capabilities and specifically the continuous operation from 10 metres to 10 000 metres the ATLAS HYDROSWEEP DS 2
39. the applied quality standard or when the transmission of the echosounder is disturbed For both types of alarms it can be individually configured how the alarms shall be presented Possible options are acoustic alarms entries in the message list within the Main Window of ATLAS HYDROMAP CONTROL and or alarm message boxes popping up on the screen ATLAS HYDROMAP CONTROL provides the possibility to handle the following different types of parameter sets Sensor control parameter sets A sensor control parameter set includes all parameter values which are necessary for the operation of a specific echosounder Sensor control parameters are for example the sensor operation mode the frequency of the transmitted acoustical pulses the bathymetric coverage the side scan coverage the TVG start gain and the TVG stop gain Sensor control parameter sets are with respect to the parameter structure and the parameter values specific for an echosounder type like the ATLAS HYDROSWEEP DS 2 Visualisation parameter sets Visualisation parameter sets refer to graphical presentations within ATLAS HYDROMAP CONTROL and include different kinds of colour tables Quality control parameter sets A quality parameter set includes accuracy values for horizontal positions depth accuracy values and minimum sizes for feature detection which are required by a user defined or common quality control standard e g IHO SP 44 Special Order according to which surve
40. trical mills cross transducer configuration the ATLAS HYDROSWEEP DS 2 allows to acquire simultaneous and independent data sets for Precise bottom bathymetry with a maximum of 240 depth channels High resolution 2 D seafloor imaging Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final ATLAS HYDROSWEEP DS 2 1 Introduction Product Description Full 3 D sonar imaging of the ensonified water column Acoustic measurement of sound velocity distribution for real time ray correction Calibrated bottom backscatter analysis providing seafloor sediment classification Look ahead acoustic navigation for scientific station planning With the actual topographic bottom profile available in each sounding all additional data sets can be viewed online in their correct geographical context This enables the operator to correlate on the fly all of the above information for an efficient real time interpretation of the acquired marine environment Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 1 2 ATLAS HYDROSWEEP DS 2 2 Description of the ATLAS HYDROSWEEP DS 2 Product Description 2 Description of the ATLAS HYDROSWEEP DS 2 2 1 General The revolutionary new hydro acoustic transducer configuration the so called symmetrical T shaped transmitter receiver array has been developed with special emphasis given to flexible high resolution ocean volume and seafloor t
41. ts e g concerning the different orders of the IHO Standards for Hydrographic Surveys SP44 or the different classes of the USACE Accuracy Performance Standards for Corps of Engineers Hydrographic Surveys User defined parameter sets The system log User administration information user names permissions and passwords At time of delivery the ATLAS HYDROMAP CONTROL database includes already predefined sensor definition parameter sets and sensor control parameter sets which have been created and approved by ATLAS Hydrographic At time of delivery the database also includes predefined quality control parameter sets referring to quality standards like the IHO Standards for Hydrographic Surveys according to which surveying may be carried out Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 3 3 ATLAS HYDROSWEEP DS 2 3 System Operation and Echosounder Control Product Description ioi x File System Presentation Extras Help HE E E EE IO Skati eis amp Silv Echosounder Control Measurement Data Data Set Time Data Set Age s Center Depth m m Water Sound Velocity Transmission State TF tees C Keel m s I Connection State Sensor Operation r Motion Data State Heave m Rd Weg Star Transmission Pitch deg Operation Mode STANDBY y Alarm Activation User IT TPE Alar
42. under type and the message types e g alarms error messages or warnings in order to search for specific log entries Additionally it is possible to search for special keywords If desired the displayed log entry results can be printed out For a very detailed analysis the system log can also be inspected by the aid of common database administration tools The system log stores the system events over a time interval history that can be defined by the user ATLAS HYDROMAP CONTROL provides the possibility to calculate the total propagated error TPE of an echosounder system The TPE calculations are based upon the stored accuracy values of the different sensors being part of the echosounder system The Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 3 5 ATLAS HYDROSWEEP DS 2 3 System Operation and Echosounder Control Product Description calculated TPE values are compared to allowed threshold values defined by the current quality standard according to which surveying has to be carried out The quality standard selected for TPE threshold values can be for example the Special Order of IHO SP44 the Class 1 of the USACE Accuracy Performance Standards for Hydrographic Surveys or a user defined quality standard It is possible to configure ATLAS HYDROMAP CONTROL in such a manner that alarms are automatically generated when the calculated TPE values are beyond the threshold values defined by
43. ware package providing an entire functional spectrum for full echosounder control data acquisition and data storage data processing data visualisation data export data printout and data replay This software package cannot only be used for the ATLAS HYDROSWEEP DS 2 bur also for all other ATLAS multibeam echosounders like the ATLAS HYDROSWEEP MD 2 the ATLAS FANSWEEP 20 and the ATLAS FANSWEEP 15 It includes also functions for the acquisition of data from single beam echosounders The graphical user interface of the ATLAS HYDROMAP ONLINE provides easy and self explanatory access to all system functions including survey planning data acquisition quality control system calibration and maintenance It provides application oriented and user friendly menu operation and guarantees widely uniform and self explanatory operation of all modules The user interface is based on the international software standards X Windows and OSF Motif OSF Open Software Foundation and includes extensive online help facilities As hardware platforms for the ATLAS HYDROMAP ONLINE standard PCs with Linux 7 3 or higher or standard Unix workstations e g from Hewlett Packard or Sun Microsystems are used The ATLAS HYDROMAP ONLINE includes the modules ATLAS HYDROMAP ACQUIRE for data acquisition ATLAS HYDROMAP NAVIGATE for navigation planning and control and the ATLAS HYDROMAP ECDIS for electronic chart display ECDIS Electronic Chart Display and Information Syste
44. ying has to be carried out A quality control parameter set includes also settings with respect to the TPE calculation alarm generation and alarm presentation Sensor definition parameter sets The definition parameters of a sensor include its product related parameters like the sensor type e g multibeam echosounder motion sensor c keel sensor or heading sensor the manufacturer of the sensor the sensor name e g ATLAS HYDROSWEEP DS 2 or ATLAS DYNABASE the sensor accuracy and the required calibration intervals Sensor installation parameter sets An installation parameter set includes all installation related parameters of the sensors being part of a surveying system In this context every sensor within a surveying system is given a logical name by which for example different sensors of the same type and name e g two GPS sensors can be distinguished The installation related parameters of a sensor include among others the serial number of the sensor its installation position within the ship and the last time of calibration Doc Id HYD DS2 ProductDescription 16c doc Edition 05 2003 Version 1 2 Status Final 3 6 ATLAS HYDROSWEEP DS 2 3 System Operation and Echosounder Control Product Description Ship s parameter sets A ship s parameter set includes ship related parameters like the ship s name the coordinates of the ship s reference point and the ship s draught Within ATLAS HYDROMAP CONTROL the dif

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