BKG Earth Rotation Simulation Tool
Contents
1. Workspace I Data Value Color Line style Marker Title text Model Combination Result HAM Excitation Model 01 01 2010 16 07 20 Plot arid c HAM Excitation Model 01 01 2010 16 B HAM Data dimensionless HAM Data dimensionless red solid 2 none v X axis text MID d X axis logarithmic scale Processing Pali see ayy Combination ole blue w solid m none v H al 4 1 Model Combination Result AZ ati Poles magenta v soid x ere x pae uz 55 393 000 2 X axis as date o Model Combination Result Model Comatio Jl Model Combination Result AAM Exiic ALOD cyan soid xm none X axis min value 0 000 f 2 7 Model Combination Result HAM Excit axis text Pole X Pole ALOD d axis logarithmic scale e Pole Y TES N Apply IERS plot Output Selected output in the workspace 3 To add more data to the selection keep pressed the Ctrl key while clicking on other data entries Click again the entry will be unselected Version V3 O 1 35 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool You can repeat the steps until all required data to be plotted are selected All the selected data will be displayed in the graphic 4 Click on Plot po InteuatonallEarthiRotation an d Reterence Syrtes SAMAA Data Pre Processing Combination Output About Workspace Data2. mr 2 Click the input data source corresponding to the data to import in the upper left field Products Version V3 0 1 19 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool Depending on the data type branches may open in which you may select data sources po iatemeational arin Rotation and AD Reference Systems Same Data Pre Processing Combination Output About Products i EOP Measured Data oad data EOP 05 C04 XML C1 Model Data Local Data elect combined range 01 01 1948 06 10 2010 Date 10 00 000 Available data sources Workspace SH Data B Total Data Bi Gap in Data Discontinuity Varying Unknown Sample Rate No data has been selected yet E EEEEEGIGGGGLLLCHLELLLCLZre0 CCCZ3CCZCCOGIGHPGALLLLRSLLCOLILE VLLJDOAE C CX O LSLCLL ICILLCOCLGANELE ESBEEAUGNEDEEDODQUSQQSIUEALGLLA SIAC 3 Click to select the data source for the analysis Version V3 O 1 InteuationalllEarthiRotation and a Faference SEM Data Pre Processing Combination Output About pe Load local file checkmark Products EOP 05 C04 XML 1 Model Data CJ Local Data Workspace cb Data Version V3 0 1 Select combined range 01 01 1948 06 10 2010 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 4 You can select a period of time within which data are to be con sidered and ad
3. A HAM Excitation Model 01 01 2010 16 M Data dimensionless Processing 7 Combination 1 Model Combination Result AAM Excitatic Model Combination Result Model Combinatic H C Model Combination Result AAM Excitatic Sq Model Combination Result HAM Excitatic Pole X Output Value Color Line Style Marker Title Text Plot grid X axis text X axis logarithmic scale 36 Plot configuration Value Color Line style Marker Title text Model Combination Result HAM Excitation Model 01 01 2010 16 07 20 Plot arid HAM Data dimensionless req v solid vl none X axis text MJD d X axis logarithmic scale 7 Pole X blue vw solid LM none Pole magenta ivl solid iv X axis max value 93 000 2 X axis as date g ALOD cyan me solid ly X axis min value 0 0004 Y axis text Pole Pole ALOD d Y axis logarithmic scale 7 Parameters for graphical output Apply button Plot button 5 Enter the parameters for the graphical output Shows the data selected item Adjust the color of the plotted graphic line Adjust the line style of the plotted graphic line solid dotted etc Defines symbols displayed at data points on the curve Enter a text that is displayed over the graphic Switch on or off whether a grid is desired in the graphic Enter the label texts for the x axis Switch
4. panels 11 plot grid 36 power density spectrum 43 power spectrum 43 pre processing panel 12 procedure panel 29 process overview 11 program start 10 47 User Manual Index BKG Earth Rotation Simulation Tool R requirements data material 9 S scale 36 37 selecting data 14 short term FFT 40 spline interpolation 44 starting program 10 structure program 11 structure program 11 structured data import 19 system requirements 8 T time frequency analysis by wavelets 45 title Text 36 U using data from data base 15 V value 36 W wavelet 45 workbench 11 working with the program 9 48 X x axis as date 37 x axis max value 37 x axis min value 37 x axis text 36 Y y axis text 37 Version V3 O 1
5. e 28 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool Example Assume you want to analyse e EOP Pole x from 1970 to 1980 e EOP Pole y from 1975 to 1985 In this case you first load the complete EOP Pole data over the complete period of time from 1970 to 1985 Then you apply analyse procedures on them or restrict the period of time depending on the type of data or procedure When plotting the data you may restrict the time period again for the graphics displaying results according your requirements Version V3 0 1 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 3 6 Pre Processing Data You can process data only if you have loaded data into the work space previously If you did not yet return to Loading and Selecting Data on page 14 Similar to the products in the data panel the procedures for data pre processing are arranged in groups Only those can be selected which correspond to the loaded data type and for which a sufficient amount of data is loaded to the workspace They are described in Procedures auf Seite 39 To set up and apply the procedure 1 Change to the Pre Processing panel either by clicking its tab or click on the forward button in the Data panel The Pre Processing panel becomes active The available anal ysis methods are listed in the left upper white field The other white field below still shows the data in the workspace x Int
6. 1 11 12 Hints Functions in panels Panel areas 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool In certain situations hints are indicated explaining briefly what is best to do next D miematonal arin RANINEN i Bi Reference SEM yation Output About ig j Shifting Select combined range 01 01 2010 30 Dec 14 Jan 29 Jan 13 Feb 28 Feb 15 Mar 30 Mar Hints RE The functions provided by the panels are available only if the previ ous steps are completed successfully The panels provide e Data select data file and a period of time of which data sets are to be analysed Pre processing select a procedure method to be used for analysis and set its parameters loaded data required Combination accumulate and compare model time series to compute correlations and differences Output set the output parameters and view the numerical and or graphic results results from completed procedure required Another panel About contains information about the program and the operator of the service It is not needed to operate the program however it may contain information of your interest The panels provide white areas in the left with which you control the program as follows e Select between the items offered depending on the current program status in the upper white field For example when the Procedure panel is active select the procedure t
7. Importing Structured Data 3 4 3 Importing Data Without Structure 3 5 Selecting Period of Time of Data and Sample Rate 3 6 Pre Processing Data 3 Combining Model Time Series 3 8 Generating Graphical Output 3 9 Printing Graphics 3 10 Exporting Graphics Procedures 4 1 Comparison 4 2 Correlation 4 3 Fast Fourier Transformation and Short Term FFT 4 4 Filters 4 5 Power Spectrum Version V3 0 1 O O1 O1 ao 10 11 11 13 14 15 19 22 27 29 33 39 38 38 39 39 39 40 41 43 User Manual BKG Earth Rotation Simulation Tool 4 6 Short Term FFT 4 7 Spline Interpolation 4 8 Time Shift 4 9 Up Downsampling and Time Shift 4 10 Wavelet Transformation Index 43 44 44 44 45 47 Version V3 O 1 1 About this Document User Manual BKG Earth Rotation Simulation Tool 1 About this Document This chapter provides an overview of this document and information on its use 1 1 Purpose of this Document This manual contains information about the structure function and operation of the program It is intended to enable and to facilitate your work and the usage of the program Read and use the manual if you work with the program and operate the software 1 2 Using this Document This manual consists of an overview of program e an overview of the process of analyzing signals with the sys tem detailed operating instructions how to use the system This manual does not contain information ab
8. for column Load config Workspace cH af Data A Select combined range 01 01 1962 gt 08 05 2008 gt 1960 1962 1964 1966 1968 1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 Generic CSV Sample Rate 0 00 d E Total Data Gap in Data M Discontinuity Varying Unknown Sample Rate Apply selected data m 2 In the Products field the columns are added in alphabetical or der as branches of the loaded file Select the branches col umns to be used for the analysis To add more columns to the selection keep pressed the Ctrl key while clicking on other entries If you click again the entry will be unselected 3 You can select a period of time within which data are to be con sidered and adjust a sample rate See Selecting Period of Time of Data and Sample Rate on page 27 4 When finished click on Apply selected data under the Selected Data field left The data are gathered from the file and added to the white Selected data field left Now they can be used for analysis Version V3 0 1 eo 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool Correcting wrong f you notice that you want to delete loaded data proceed as follows entries 1 Select the data entry to delete in the workspace and right click the data entry 2 Select Delete from the context menu showing up The entry will be deleted eo Version V3 O 1 3 Working with
9. input signal in powers of two i e dividing or multiplying by 2 4 etc Upsampling and down sampling are offered as two different methods with a parameter to specify the resampling factor Version V3 0 1 Sample Factor Resampled Value 4 Procedures User Manual BKG Earth Rotation Simulation Tool The modification of the sample rate follows the Theory of sampling band limited signals for the special case of low pass limited signals i e upsampling uses an interpolation of higher degree This means that the signal is filled up with zeroes and then be low pass filtered The low pass usually provides a cut off frequency of half the sam pling rate of the original signal When downsampling the sample rate changes so that the rules for the low pass limit are tightened This is ensured by previous low pass filtering Furthermore time shifting is provided The signal remains unchan ged only the time axis information is changed Input parameters are opecifies the sample factor for the signal Output parameters are Contains the resampled signal 4 10 Wavelet Transformation Scaling Sigma Version V3 0 1 This method conducts a high resolution time frequency analysis by means of a wavelet analysis Output of the method is a time frequency series Mother wavelet is the Morlet wavelet see Oliver Faber Effiziente Wavelet Filterung mit hoher Zeit Frequenz Aufl sung Theoreti sche Geod sie Heft Nr 119 ht
10. signal shift another output is at which time shift the correlation is maximized and minimized and the peak values of both 39 4 3 40 Correlation Maximum Minimum Timepoint Maximum Timepoint Minimum FFT Length Window Type Amplitude Frequency Imaginary Part Phase Real Part 4 Procedures User Manual BKG Earth Rotation Simulation Tool Output parameters are Contains the correlated signal Contains the maximum correlation value Contains the minimum correlation value Contains the time of the maximum correlation value Contains the time of the minimum correlation value Fast Fourier Transformation and Short Term FFT This method applies an FFT on the time series input Input parameters are Select an FFT length from 2 to 65536 in steps of powers of two The signal is filled up with zeroes up to the specified length Select a Window type e None e Square e Hamming e Hanning Output parameters are Contains the amplitude series values FFT magnitude Contains the frequency series values Contains the imaginary part series values Contains the phase series values FFT phase prograde and retrograde Contains the real part series values Version V3 0 1 4 4 Filters Version V3 0 1 4 Procedures User Manual BKG Earth Rotation Simulation Tool These methods allow for filtering the input time series by different FIR filters finite impulse response filters The fil
11. status and shows when the proc ess is complete Then result is output in the graphical display and added to the workspace mass ee 1 7 Data Pre Processing Combination Output About Procedures For Pre Processing Approximation Resampling Shifting C1 EOP Correction Workspace A Data 7 Pre Processing 3 dimensionless EE Spline Interpolation Result OAM Excitat gt Version V3 0 1 Hints New Interval Fraction of Unit 0 680 Time Shift Fraction of Unit 0 0E0 Select combined range OAM Excitation Model Spline Interpolation Result 01 01 2010 gt 16 07 2010 gt Set common time period Date 13 Feb 28 Feb 15 Mar 30 Mar 14 Apr 29 Apr 14 May 29 May 13 Jun Target Sampling rate 0 17 v 30 Dec 14 Jan 29 Jan 28 Jun 13 Jul Sample Rate 0 25 d Sample Rate 0 17 d B Total Data Gap in Data Discontinuity Varying Unknown Sample Rate Procedure output in the workspace If it is required to improve the results return to altering the parame ters or to load other data This is described in the previous sections You can repeat the previous steps to collect various data in the workspace If the results are complete and meet the expectations you can use them as an input for other procedures use them for combination and comparation as described in Combining Model Time Series on page 33 e continue with
12. the Program User Manual BKG Earth Rotation Simulation Tool 3 5 Selecting Period of Time of Data and Sample Rate Version V3 O 1 To compare model data time series it is required that they e refer to the same period of time and provide the same sample rate You will note that you can select a period of time of the data at each stage of the program Select combined range 01 01 1948 gt 29 09 2010 10 00 000 The reason is that different time data can be required in the different stages but need to be loaded only once The graphical time display shows the periods of time of all loaded data one below the other You can easily recognise signal gaps discontinuities and varying sample rates Once the data are loaded reduce their period of time for processing according to your needs 1 Enter start time and end time of the period to analyse Enter them into the date fields If you click the Set Com mon Time Period button the fields are set to start and end date of the period of time shared by all loaded data Use the graphical selector Left click into the graphic at the start time draw right to the end time and release the mouse button Over the processing period of time the are no gaps discontinuities and varying sample rates allowed If so use pre processing functions to remove them Pre processing data is one of the subse quent steps and is explained in Pre Processing Data on page 29
13. turning them into graphical output as described in Generating Graphical Output on page 35 Otherwise repeat the previous steps 31 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool Correcting wrong If you notice that you want to delete data from the workspace pro entries ceed as follows 1 Select the data entry to delete in the workspace and right click the data entry 2 Select Delete from the context menu showing up The entry will be deleted 32 Version V3 0 1 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 3 7 Combining Model Time Series This function allows to combine and compare different types of mo del time series data As a first step create combinations of model time series by simple accumulation Then compare the model combinations and EOP data sets Relations between the model combinations and or the EOP time series and differences between the compared parame ters of the model combination can be computed and displayed The methods are described in Procedures auf Seite 39 1 Change to the Combination panel either by clicking its tab or click on the forward button in the Pre Processing panel 2 The Combination panel becomes active The available combi nation methods are listed in the left upper white field The other white field below still shows the data in the workspace po Inemational rte de NETS Is In Data Pre Processing Combinat
14. workspace If you have selected the proce dure prior to the data inappropriate data become not selecta ble anymore are greyed out in the workspace The procedures may provide input parameters Enter proper values for the intended analysis po Intermationell Sy fe YET erate Reference SEM Data Pre Processing Combination Output About Procedures For Pre Processing re Approximation Resampling Shifting IE Spline Interpolation i Up and Downsampling J EOP Correction Workspace ig Data 1 OAM Excitation Model 01 01 2010 16 eH Pre Processing lt gt o 8n 30 Hints New Interval Fraction of Unit pe A P aram ete r s O 0E0 Selected procedure Time Shift Fraction of Unit Select combined range 01 01 2010 16 07 2010 gt Set common time period 28 Feb Target Sampling rate 0 17 v 30 Dec 14 Jan 29 Jan 13 Feb 15 Mar 30 Mar 14 Apr 29 Apr 14 May 29 May 13 Jun 28 Jun 13 Jul OAM Excitation Model Sample Rate 0 25 d B Total Data Bi Gap in Data M Discontinuity Varying Unknown Sample Rate Selected data in the workspace Run button Progress bar Version V3 O 1 po Inematonal rnin Rotation and Reference Systems SIMA 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 5 When finished click the Run button Analysis starts A progress bar indicates the
15. 06106 0 002000 Workspace fH 1 Data 5 Select combined range 01 01 1948 gt 06 10 2010 gt Date 10 00 000 B Total Data Bi Gap in Data M Discontinuity Varying Unknown Sample Rate The first line of the data table is shown in the text field This maybe the line with the table header information names of the columns or it also maybe the first data line Table structure You can either use a predefined configuration or enter a configura configuration tion The configuration specifies the column separator and the names of the columns You can skip these steps if the first line of the table contains the column names anyway To use a predefined configuration load it from file 1 Click on Load config 2 Find the desired file and click on OK The file is loaded 3 Click on Apply The configuration is applied to the loaded data Version V3 0 1 23 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool Alternatively specify the configuration 1 Adjust the proper column separator and click the Next button 2 Click in the first table cell under the table header and enter a column name Click on Apply or use the Enter key when you finished with a name Repeat this for each column po iemetonal Eire Ent AD Reference SAn SIMA Data Pre Processing Combination Output About Products Text convert
16. Result Spline Interpi ES Pole x Hint Pole X Pole Y Model Combination Result Spline Interpolation Result AAM Excitation Model 01 01 2010 16 07 2010 AAM Data dimensionless Y dimensionless r 0 00000 0 00025 t 0 00050 f 0 00075 t 0 00100 0 00125 0 00150 s ao 1v 0 00175 0 00200 0 00225 r 0 00250 0 00275 0 00300 Jan 2010 Feb 2010 Mar 2010 Apr 2010 MJD d May 2010 Jun 2010 Jul 2010 Version V3 0 1 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 3 8 Generating Graphical Output To generate graphical output plotting data and or procedure and or combinations output needs to be in the workspace Two dif ferent methods for plotting are available If this is not yet fulfilled return to e Loading and Selecting Data on page 14 or Pre Processing Data on page 29 or e Combining Model Time Series on page 33 To generate graphic output Note that the upper 1 Change to the Output panel either by clicking its tab or click on white control field the forward button in the Procedure panel disappeared only He pdt din 2 Select the data to display graphically in the workspace Ex k E 84938498 metum t EE IntermationalllEartheRotation and 2 EET o ETES tS Reference SEM d Data Pre Processing Combination Output About Plot configuration
17. ameters are opecifies the center frequency of the band pass Select between e Monthly 30 days e Semi Annual 182 days e Annual 365 days e Chandler Wobble 435 days opecifies the filter length of the differentiation filter Specifies filter coefficients for the generic filter Separate the values by Specifies the cut off frequency of the filters Select between e Monthly 30 days e Semi Annual 182 days e Annual 365 days e Chandler Wobble 435 days Specifies the averaging time pulse period for the filter Select between 6 14 30 60 and 90 days Output parameters are Contains the series of filtered values Version V3 0 1 4 Procedures User Manual BKG Earth Rotation Simulation Tool 4 5 Power Spectrum This method estimates a power density spectrum using averaged periodograms The parameters should be set to useful values according to the data set signal length Result is a frequency series Input parameters are Number of Specifies the number of periodograms Periodogram Overlap of Specifies the overlap of the periodograms in percent Periodogram Window Type Select a Window type e None e Square e Hamming e Hanning Output parameters are Amplitude Contains the amplitude series values FFT magnitude Frequency Contains the frequency series values Imaginary Part Contains the imaginary part series values Phase Contains the phase series values FFT phas
18. d select the file and click on Open The program is set to the status as stored in the file 13 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 3 3 3 Using Online Help The program provides online help for each panel 1 Click on the Help button to call for help about the currently ac tive panel Help is displayed in a standard web browser or in a specific help viewer depending on the type of installation 3 4 Loading and Selecting Data You can decide to use predefined data from the data base or own structured data or own data without structure Note s The meaning the comparability and the combinability of input data is not sub ject of this documentation This document deals with the program operation only on which data have no effect In doubt test different data combinations or ask the operator of the software see e Using Data from the Data Base on page 15 e Importing Structured Data on page 19 e Importing Data Without Structure on page 22 14 Version V3 0 1 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 3 4 1 Using Data from the Data Base In the Data panel you select the data to be analysed They are ar ranged in tables presented in form of a so called tree that is the data are grouped in different levels product groups Basic procedures Correlation Approxima tion etc in the root of the tree products which can be in t
19. detic data sets The data sets can be selected by means of a graph ical user interface and be loaded into an analysis application Predefined data sets of different origin are available as well as the functionality to use own data sets The time series can be combined and the procedures intended to be applied on the data sets can be selected and be parameterized Result data can be presented as numeric data or visualized graph ically wnereby users can widely control the graphical output The software is divided into three operational sections separated by tabs The sections are e Data select data file and a period of time of which data sets are to be analyzed e Pre Processing select a pre processing procedure method to be used for analysis and set its parameters Combination accumulate and compare model time series to compute correlations and differences Output set the output parameters and view the numerical and or graphic results Another section About presents information about the program op erator disclaimer and imprint The following chapters show how to operate the program The dif ferent procedures and their outputs are described in separate doc uments 2 Introduction User Manual BKG Earth Rotation Simulation Tool 2 2 System Requirements The program can be run platform independently in a browser Suffi cient computing power is required on the client computer or on the server The program
20. di BKG Earth Rotation Simulation Tool User Manual Version V3 O 1 MEDAV GmbH 2010 MEDAV GmbH Grafenberger Stra e 34 D 91080 Uttenreuth Tel 49 0 9131 583 0 Document BKG Earth Rotation Simulation Tool User Manual Version V3 0 1 Issue 10 27 2010 Copyright This document is protected by copyright laws Trademarks For better legibility in this document marking of trademarks is waived This should not mislead to the assumption that these trademarks are to be used freely by anybody Contact for Errors or Complaints The product is the result of highest possible effort for reliable function and easy usability When editing this document greatest importance was attached to com pleteness and correctness Even so if you find an error or incompleteness please contact MEDAV GmbH Tel 49 9131 583 0 eMail info medav de The document is subject to change without prior announcement User Manual BKG Earth Rotation Simulation Tool Table of Contents About this Document 1 1 Purpose of this Document 1 2 Using this Document 1 3 Special Representations Introduction 2 1 Overview 2 2 System Requirements Working with the Program 3 1 Requirements of the Data Material 3 2 Starting the Program 3 3 Overview of the Process 3 3 1 Structure of the Program 3 3 2 Interrupting and Continuing Work 3 3 3 Using Online Help 3 4 Loading and Selecting Data 3 4 1 Using Data from the Data Base 3 4 2
21. e prograde and retrograde Real Part Contains the real part series values 4 6 Short Term FFT see Fast Fourier Transformation and Short Term FFT on page 40 Version V3 0 1 43 4 7 4 8 4 9 44 4 Procedures User Manual BKG Earth Rotation Simulation Tool Spline Interpolation New Interval Time Shift Y This method conducts a spline approximation or interpolation This is a resampling or interpolation method i e the number of available samples can be increased via the spline approximation and the time series can be complemented by additional values bet ween the real sample values As an adjustable parameter for the spline approximation the new sample interval is specified which can be set freely A time shift in the subsample domain can be spe cified additionally The method checks whether the new sample interval is shorter than the original interval of the input time series Only in this case the method can be applied usefully A residual signal cannot be determined by this method Input parameters are Specifies the new sample interval Specifies a value for the time shift Output parameters are Contains the result values of the polynome interpolation Time Shift see Up Downsampling and Time Shift on page 44 Up Downsampling and Time Shift This method conducts up and downsampling on the input signal and allows for time shifting It enables for changing the sample rate of the
22. ed 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 3 2 Starting the Program The program runs in a web browser Note s Response time of the program strongly depends on the quality of the internet connection To start the program 1 Start a web browser and enter the URL internet address of the program as you received by your software operator 10 Version V3 0 1 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 3 3 Overview of the Process This section briefly explains how to turn numerical geodetic time se ries data into expressive overview graphics 3 3 1 Structure of the Program The program is subdivided into panels which can be invoked by the tabs at the upper edge of the program window They are intended to be used one after the other from the left to the right therefore alternatively they can also be invoked by forward backward buttons switching between subsequent panels po Inematonal rin Rotation and Raerence Systems SIMAS Data Pre Processing Combination Output About Products C1 EOP Measured Data C1 Model Data Local Data 01 01 1948 29 09 2010 gt Date 10 00 000 Tabs to switch between panels Workspace Data B Total Data Gap in Data M Discontinuity Varying Unknown Sample Rate Forward Backward Buttons No data has been selected yet Version V3 0
23. ejationalllEanthiRotation and 4 i Raerence SEM Data Pre Processing Combination Output About Procedures For Pre Processing Hints c Approximation Resampling Shifting C1 EOP Correction Select combined range 01 01 2010 gt 16 07 2010 gt Set common time period Target Sampling rate o 17 v Date 30 Dec 14 Jan 29 Jan 13 Feb 28 Feb 15 Mar 30 Mar 14 Apr 29 Apr 14 May 29 May 13 Jun 28 Jun 13 Jul Sample Rate 0 25 d B Total Data Bi Gap in Data M Discontinuity Varying Unknown Sample Rate workspace Tk l Data EE I 44M Excitation Model 01 01 2010 16 Pre Processing List of available procedures Loaded data in the workspace Version V3 0 1 29 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool Note s The meaning effect parameters and the output of the procedures are subject of the descriptions shipped with these procedures This document deals with the program operation only on which the procedures do not have effect 2 Select the data in the workspace on which you intend to apply the procedure 3 Select the procedure or procedure group in the upper left field Procedures for Pre Processing by a click Branches with procedures may open for selection If so select the appropriate type of procedure If not return to selecting appropriate data Only procedures are selectable which are suitable to the loaded data in the
24. elected Enter start time and end time of the period to analyse in the date fields or use the graphical selector 17 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 8 Click on Apply selected data The data are displayed in the lower white field workspace when loading is finished You can repeat the steps until all required data are in the workspace When all the correct data are in the workspace you proceed with setting up the analysis procedure see Pre Processing Data on page 29 Correcting wrong f you notice that you want to delete loaded data proceed as follows entries 1 Select the data entry to delete in the workspace and right click the data entry 2 Select Delete from the context menu showing up The entry will be deleted 18 Version V3 O 1 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 3 4 2 Importing Structured Data You can load structured own data if their structure corresponds to that of the sources in the data base 1 Activate the Data panel gt Imemafonal Er Rotation and Ae gacamo SIMA Data Pre Processing Combination Output About C1 Model Data C1 Local Data Select combined range 01 01 1948 29 09 2010 gt Date Data panel Workspace H Data B Total Data Bi Gap in Data M Discontinuity Varying Unknown Sample Rate No data has been selected yet
25. er c EOP Measured Data IADA ERSTIiinstuffiSw Datenleopc04 62 now csv EOP 05 C04 XML Separators C1 Model Data Local Data OTabstop Semicolon Comma me Generic CSV Space Other Input name For column Second Third Apply Load config Time First Second Second 404 405 406 407 408 409 410 A11 A12 37665 0 012700 0 030000 0 213000 0 030000 0 0326338 0 020000 0 0017230 0 0014000 l0 064246 0 012000 0 006106 0 002000 x em Workspace H Data Select combined range 01 01 1948 gt 06 10 2010 gt Date 10 00 000 Edit here header to edit B Total Data Bi Gap in Data M Discontinuity Varying Unknown Sample Rate v ea 3 If you want to re use this configuration later save it to file To do so click on Save config find a directory enter a file name and click on Save Version V3 O 1 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool Converting and When configuration is finished continue with converting the and loading the file gading the file 1 Click on Convert progress bar indicates the loading status and shows when the load process is complete ht ee 1 7 x InteuationallEanthiRotation and vet 12 799 Erro Data Pre Processing Combination Output About Text converter Products a Model Data l Choose and load file a Separators ME Tabstop Semicolon Comma Space Other Input name
26. ion Output About Reference Systems SAME Procedures for Combination C1 Combination C1 Result Evaluation Workspace cH Gi Data Version V3 0 1 Hint Select one or more Model Data time series and run the Model Combination procedure to create a model combination 3 Select the data in the workspace on which you intend to apply the combination method 33 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 4 Select the method or methods group in the upper left field Pro cedures for Combination by a click Branches with methods may open for selection If so select the appropriate type of method If not return to selecting appropriate data Only methods are selectable which are suitable to the loaded data in the workspace If you have selected the methods prior to the data inappropriate data become not selectable any more are greyed out in the workspace When finished click the Run button Analysis starts A progress bar indicates the status and shows when the proc ess is complete Ay Iniemational Farin Rotation and AD Reference Systems Same Data Pre Processing Combination Output About Procedures for Combination fe Combination i Ex Model Combination C1 Result Evaluation e Workspace A Data C1 Pre Processing i Combination EX Pole v ES ALOD 34 Combination
27. just a sample rate See Selecting Period of Time of Data and Sample Rate on page 27 Start and End time oe Load button Graphical period selector s B Total Data Bi Gap in Data Discontinuity Varying Unknown Sample Rate No data has been selected yet Progress bar 5 Checkmark Load local file to activate loading of a local file 6 Click on Choose and load file Select the file to load and click on OK The file is loaded The period of time over which data sets are contained in the file is indicated in the graphical period selector 7 In the Products field the columns are added as branches of the loaded file Select the branches columns to be used for the analysis To add more columns to the selection keep pressed the Ctrl key while clicking on other entries If you click again the entry will be unselected 8 When finished click on Apply selected data under the Selected Data field left 21 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool The data are gathered from the file and added to the white Selected data field left Now they can be used for analysis Correcting wrong f you notice that you want to delete loaded data proceed as follows entries 1 Select the data entry to delete in the workspace and right click the data entry 2 Select Delete from the context menu showing up The entry will be deleted 3 4 3 Importing Data Without Str
28. needs Java Runtime environment Version 1 5 on the client computer 8 Version V3 0 1 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 3 Working with the Program Follow the instructions of this chapter to operate the program 3 1 Requirements of the Data Material Handling of irregular data Version V3 0 1 Data of different origin and use are available by the software how ever you can also use own data The program can handle data in CSV and XML table formats The first column of the table is always used as x axis parameters During the load process each data series is checked for regular time intervals Some procedures presume regularity of the time in tervals so a warning is printed if irregular time intervals are de tected Special resampling procedures exist to fill gaps in data series or to create regular data from irregular data Spline based interpolation or Chebychev Polynom interpolation resamples those data se ries The target interval can be selected from a list where the minimum interval is half of the current interval and the maximum is calculated so that at least 10 sample points are in the result series or one year whichever is less The procedures check the input data for interval sizes and propose the most probable target interval If the intervals exceed a certain value the procedure will print an error message The exact size of the valuedepneds on the procedure us
29. o be used e See select and delete data objects loaded for analysis depending on the program status workspace in the lower white field For example when the Procedure panel is active select data for graphical output Version V3 O 1 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool In the larger right area of the program window enter data or view outputs depending on the situation Follow the detailed steps de scribed in the sections below e Loading and Selecting Data on page 14 e Pre Processing Data on page 29 e Combining Model Time Series on page 33 e Generating Graphical Output on page 35 3 3 2 Interrupting and Continuing Work Saving the program status Loading a program status Version V3 0 1 You can interrupt your work at any time and continue later If you want to do so save the current program status to a local file and re load the file when you want to continue To save the current program status 1 Click on Save El 2 Find a location for the file enter a file name and click on Save The file is saved to the given location It contains all current program information If you want to load a status file be aware that the current program settings will be replaced by those of the file and will be lost If you want to preserve your current settings first save them to another file as described above To reload the status file 1 Click on Load 2 Find an
30. on or off logarithmic scale for x axis Version V3 O 1 x axis max value x axis as date x axis min value Y axis text Y axis logarithmic scale Generate default Data Pre Processing Combination Output About X Y Plot 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool Select the period of time to be displayed here the lower start value Data loaded and processed remain unchanged this setting refers to the display gra phic only Enable to display the x axis in date format MM DD YY Y Y If disabled the x axis is displayed in MJD format Modified Julian Date double integer value Select the period of time to be displayed here the upper end value Data loaded and processed remain unchanged this setting refers to the display gra phic only Enter the label texts for the y axis Switch on or off logarithmic scale for y axis If two data series are selected as input activate this to plot the series against each other instead of plotting them both over time This requires two data series over the same period of time If other than two data series are selected as input this function is not available Note that not all parameters apply for each type of input data 6 Click on the Apply buttons to generate the graphic s The graphic s shows up Di Reference SES yams Sa Workspace J Data C Pre Proces J Combination sing Model Combina
31. out the data or data for mats and not about procedures applied for analysis This type of knowledge is assumed to be present to the users of program and must be achieved from other sources Version V3 0 1 5 1 About this Document User Manual BKG Earth Rotation Simulation Tool 1 3 Special Representations Cross references Controls Keys Cross references are displayed as shown here The steps in the chapters containing step wise instructions partially refer to on screen controls These are e g e buttons to be clicked with the mouse lists from which elements are to be selected drop down list fields etc fields into which text is to be entered text fields All these carry labels which are represented as shown here If keys or combinations of keys are required for operation then this is represented as follows e Ctrl a means that the Ctrl key and the a key lower case must be pushed simultaneously e Return means that the Return key must be pushed e Shift means that the Shift key must be pushed The steps of the instructions are numbered and should be carried out in the given order if nothing else is denoted Version V3 O 1 2 Introduction User Manual BKG Earth Rotation Simulation Tool 2 Introduction The program allows for interactive analysis of geodetic time series data 2 1 Overview Version V3 0 1 Users can apply standard methods of time series analysis on geo
32. re sources to the selection keep pressed the Ctrl key while clicking on other entries If you click again the entry will be unselected 16 Version V3 0 1 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool To add a complete branch just click it All elements of the branch will be selected Ox Intermational EEE QE Rarancea SEM Data Pre Processing Combination Output About Products EOP 05 C04 XML Model Data Local Data Select combined range 10 00 000 Workspace ci Data ENSE Progress bar Start and End time 01 01 1948 2 06 10 2010 4 Load button Date Graphical period selector B Total Data Bi Gap in Data Discontinuity Varying Unknown Sample Rate No data has been selected yet xN 4 5 6 7 Version V3 0 1 Click the Load button to load them into the program A progress bar indicates the loading status and shows when the load process is complete The data are listed in a table for selection You can select a period of time within which data are to be con sidered and adjust a sample rate See Selecting Period of Time of Data and Sample Rate on page 27 Select the data to analyse in the Product field They refer to the columns of the table To add more columns to the selection keep pressed the Ctrl key while clicking on other entries If you click again the entry will be uns
33. ta in the workspace in the Output branch 2 Select Export JPG or Export PNG 3 Find a directory and enter a name for the file 4 Click on Save 38 Version V3 0 1 4 Procedures User Manual BKG Earth Rotation Simulation Tool 4 Procedures In this chapter the methods are listed and described in alphabetical order 4 1 Comparison Time Shift Difference Time shifted This method allows for visual comparison of two signals without fur ther modification It expects two time series as input which are directed to output wit hout modification so that they can be viewed in the same plot whe reby however one of the time series can be time shifted as specified by parameter see Up Downsampling and Time Shift on page 44 Input parameters are Specifies a time shift value Output parameters are Contains the difference between the two signals Contains the time shift 4 2 Correlation Version V3 0 1 This method computes the normalized correlation coefficient of two signals Autocorrelation is a special case of correlation If the correlation is plotted over time the length of the window used for the correlation must be specified similar to short term correlati on and the number of points at which a correlation shall be com puted The default values depend on the signal length Another parameter specifies a time shift of the signals against each other If the correlation is plotted over the
34. ters are band pass e differentiation generic high pass low pass moving average The band pass filter the high pass filter and the low pass filter have a linear phase least square filter design Certain fix cut off fre quencies are given for these filterings see table below Select between high pass or low pass filters They are available with the following sample rates hourly four times a day daily The method checks whether one of these sample rates is used and automatically selects the correct filter If a different sample rate had been used it issues an error message The differentiation filter is an FIR filter The filter length can be specified by parameter i e the number of samples used The moving average filter is an FIR filter with a rectangular impul se response The pulse period in days can be specified by para meter The default value depends on the selected type of filter the user setting is checked for validity 41 Band Pass Filter Center Frequency Differentiation Filter Filter Length Generic Filter Filter Coefficients High Pass Filter Low Pass Filter Cut Off Frequency Moving Average Averaging Time Filtered Values 4e 4 Procedures User Manual BKG Earth Rotation Simulation Tool A generic filter using individual filter coefficients is available to ad vanced users All coefficients and the filter degree can be specified by parameters Input par
35. tion Result AAM Excitation M Version V3 0 1 Model Combination Result AAM Excitation Model 01 01 2010 16 07 2010 AAM Data dimensionless 0 00000 0 100 0 00025 0 075 idis 0 00050 0 050 0 00075 0 025 90 000 0 00100 0 00125 0 00150 s ao 1V 0 00175 Pole X Pole Y 0 00200 0 00225 0 00250 0 00275 0 00300 2 o eo o o o o J J 2 o o J D N UM N O d uU 37 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool If you are satisfied with the result you are finished Improving and Otherwise you may alter the output parameters by returning to en Adding new tering the parameters Graphics 1 If desired select other output data 2 Click on Plot and change the desired parameters 3 Click on Apply A new graphic will be generated and added to the previous graphics Note s Note you can return to any previous panel to alter selections in the data proce dure output control field or in the workspace to improve your results 3 9 Printing Graphics Graphics can be printed To print graphics 1 Right click the data in the workspace in the Output branch 2 Select Print The printer control panel opens 3 Setup the printer and click on OK The graphics are printed 3 10 Exporting Graphics Graphics can be exported as PNG or JPEG file To export graphics data 1 Right click the da
36. tp dgk badw de Index php id 1 1 A parameter is the parameter Sigma in the publication named abo ve Another parameter specifies whether prograde or retrograde portions are plotted scaling parameter a gt 0 or scaling parameter a lt 0 Input parameters are Specifies whether scaling prograde or retrograde Specifies the Sigma value as explained in the named documents 45 Time Real Amplitude 46 User Manual BKG Earth Rotation Simulation Tool Output parameters are Contains the time value series Contains the real amplitude value series 4 Procedures Version V3 0 1 User Manual Index BKG Earth Rotation Simulation Tool Index A about panel 12 analysis procedure 29 applying analysis procedure 29 autocorrelation 39 C color 36 combination panel 12 comparison 39 control fields 11 correlation 39 D data base using data 15 data material requirements 9 data panel 12 14 data without structure importing 22 F fast Fourier transformation 40 FFT 40 FIR filter 41 G generate default X Y plot 37 generating graphical output 35 graphical output 35 grid 36 Version V3 0 1 H hints 12 importing data without structure 22 importing structured data 19 L line style 36 loading data 14 logarithmic scale 36 37 marker 36 methods 39 O online help 14 output panel 12 35 overview process 11 P
37. ucture You can load data without structure that means the data are ar ranged in a table In this case load the data and add structure infor mation as table column separators and names To use own data without structure 1 Activate the Data panel miematonol Carin RAINE 4 Reference Systems SEM Data Pre Processing Combination Output About Select combined range 01 01 1948 29 09 2010 Date Data panel Workspace ci Data B Total Data Bi Gap in Data M Discontinuity Varying Unknown Sample Rate No data has been selected yet 2 In the Products field select Local Data Generic CSV ec Version V3 O 1 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool The CSV Import panel shows up in the right allowing for selec tion of a data file and specifying parameters 3 Click on Choose and load file Select the file to load and click on OK po InteuetionsllEarthiRotation and Reference Siamo SAMAS Data Pre Processing Combination Output About Products Text converter J EOP Measured Data I IDA_ERSTiinstuffisw DatenleopcO4 62 now csv EOP 05 C04 XML Separators 1 Model Data Tabstop Semicolon Comma Local Data Generic CSV Space Other Input name for column Load config 37665 0 012700 0 030000 0 213000 0 030000 0 0326338 0 0020000 0 0017230 0 0014000 0 064246 0 012000 0 0
38. urn subdivided into groups depending on the selected product group Basic statistics Autocorrelation etc in the branches of the tree data vectors name of a table column depending on the selected product in subbranches To load predefined data from the data base proceed as follows 1 Activate the Data panel po Intemational rnin Rotation and Reference SEM Data Pre Processing Combination Output About Local Data Select combined range 01 01 1948 29 09 2010 gt Date 10 00 000 Workspace eu Data E Total Data Bi Gap in Data Discontinuity Varying Unknown Sample Rate No data has been selected yet Version V3 0 1 15 3 Working with the Program User Manual BKG Earth Rotation Simulation Tool 2 Click on an input data source in the upper left field Products Depending on the data type branches may open in which you may select data sources po miematonal Bari te es T e Reference Systems SIMA Data Pre Processing Combination Output About Products EOP 05 C04 XML C1 Model Data Local Data elect combined range 01 01 1948 06 10 2010 Date 10 00 000 Available data sources Workspace TkH Data B Total Data Bi Gap in Data Discontinuity Varying Unknown Sample Rate No data has been selected yet j 3 Click to select the data source or sources for the analysis To add mo
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