RG_MAN-0001 GPS Manual V2
Contents
1. 0 5bv with 50 duty cycle 94 Hz per 1 m s 940 Hz per 36 km h 1933 HZ per 46 mph 1 0638 cm per pulse can be connected to inputs which have a 12v pull up resistor but output will still be 0 5v square wave Power Supply Operating Voltage 6 to 18 Volts DC Operating Current 0 380 Amps at 12 Volts Operating Temperature Ambient Temperature Range 22 F to 158 F 30 C to 70 C Housing Material Anodized 6061 Aluminum Race Grade Notes 11 Physical Case Size 3 95 x 2 35 x 0 9 inches excluding connectors 100 x 60 x 23 mm excluding connectors Weight 160 grams without antenna MIA AA Fans Dimensions in inches Connection The mating connector is a ASL 606 05SN e pin 1 Ground negative battery do not use a Ov line e pin 2 RS 232 Tx serial data out For ADL2 or ADL3 connect to pin 79 For SDL connect to pin 34 For ACL connect to pin 15 or pin 20 e pin 3 12 volt supply 6 to 18 volts allowed pin 4 CAN Low e pinS CAN High2. get the most accurate data Therefore best operation is achieved with these lights on Race Grade GPS Page 5 RS 232 Serial Output standard NMEA 0183 message strings GPGGA and GPRMC are sent out by default at a baud rate of 57 600 The baud rate and type of messages can be changed by sending the unit back to Race Grade CAN Output The RaceGrade GPS version 2 receive now includes a CAN output The CAN bus speed operates at 1 mbit s and on the base ID of 0x146 The CAN output is based off the MoTeC GPS with STC serial to CAN Simply select the GPS Async template for MoTeC devices 20 Hz Update Option This option allows the following four channels to update at a true 20 Hz rate e GPS Latitude e GPS Longitude e GPS Speed e GPS Heading It s best to buy this option at the time of purchase If you buy it afterwards the unit must be sent to Race Grade for updating Options must be specified at the time of ordering Race Grade Notes 6 Installation GPS Receiver The enclosure is made from 6061 Aluminum alloy It should be mounted in a safe location away from electrical noise vibration and temperature Maximum operating temperature is 70 C or 158 F NOTE To counter any possible vibration damage please mount the receiver box on soft Velcro not the hard industrial type or even double sided foam tape Antenna The location of the antenna is VERY important It should be mounted such that it can have a c
3. PS Global Positioning System device works Please read it thoroughly Installation is very important and understanding how GPS works will help you get the most from this sensor The GPS device uses an antenna on top of the vehicle to track satellites in orbit around Earth lt takes a minimum of three satellites to identify your position on earth and a fourth to calculate accurate timing ia cleat Satellites are constantly moving and a satellite which ne antenna sees at the start of the race might not be visible minutes later Satellites used in the GPS solution are dynamically added or dropped based on signal quality Ideally you should have 8 or more satellites being tracked in order to obtain good accuracy Anything under 6 satellites is quite poor With more satellites there is more information to correctly identify your position with less error So it s easy to see the importance of your antenna having a clear line of sight to the satellites in the sky The system is a 12 channel receiver and able to use up to two of the tracked satellites as special geostationary satellites SBAS which provide DGPS differential GPS via WAAS correction Therefore the maximum reported satellites in the data will be 10 Differential GPS uses those SBAS satellites to more accurately calculate your position Positional accuracy goes from 3 meters to under 0 7 meters with Differential GPS Race Grade GPS Page 4 Warm Up Time When the GPS rec
4. eiver is first powered it will start searching for satellites to lock onto This process takes time It will take longer the first time you power up at a new location from where you had previously turned it off Normal cold start up times meaning being in a new area from the previous location can be anywhere from 2 to 10 minutes Subsequent warm start up times at the same location normally takes 30 seconds to 2 minutes If you are outside of North American expect the very first time to take up to 20 minutes Internal Battery There is also now an internal battery to store the recent location during power off This will aid in warm starts instead of cold starts resulting in dramatically less time to lock onto satellites The internal battery has a 10 year life and is not user replaceable After ten years please contact JGM Automotive Tooling for replacement Status LEDs There are 4 LEDs on the front face of the unit labeled as follows e POWER red Unit has power e GPS yellow GPS signals have been acquired and calculated data is being sent out e DIFF yellow SBAS differential satellite available e DGPS green Differential corrections are active resulting in improved data This is the light you really want to see on There are only two required lights for operation one is POWER and the other GPS The DIFF and DGPS lights indicate increased accuracy of the data With differential correction you will
5. ity The channel GPS Sats Used is a value that represents the number of satellites used in the calculations A value of 8 to 10 is excellent A value of 6 or 7 is decent but may suffer some noise Values below 6 will have very poor accuracy For the RaceGrade GPS the number of satellites does not include the SBAS or WAAS DGPS satellites So a value of 10 is the maximum possible even though the unit is capable of tracking 12 satellites Most other GPS units include these in the reported satellites used Most other GPS units accept multi path signal and therefore the channel GPS Sats Used can not be analyzed to estimate accuracy with any degree of precision Setup for SDL ADL2 ADL3 ACL For ADL2 SDL or ACL use please select the template GPS Standard RMC GGA listed under the communications RS 232 Verify 57 600 for the baud rate You ll be able to log the following channels of information Recommended Logging Rates Update Option 10 Hz 20 Hz e GPS Latitude 20 Hz 50 Hz e GPS Longitude 20 Hz 50 Hz e GPS Speed 20 Hz 50 Hz e GPS Heading 20 Hz 50 Hz e GPS Date 1 Hz 1 Hz e GPS Time 10 Hz 10 Hz e GPS Sats Used 10 Hz 10 Hz e GPS Altitude 10 Hz 10 Hz For the 10 Hz update rate channels should be logged at 20 Hz even though they only update at 10 Hz This will help minimize the time delay between when the data arrives to the logging device through the serial stream and the moment the values are logged For the 20 Hz
6. lear view of the sky out to 5 degrees above the horizon Poor mounting locations will have a large negative impact on the results from its calculated data Normally the best location would be on top of the race car For motorcycles on top of the rear fairing works well On a closed wheel race car the best choice is the roof For best performance do not place the antenna under the front or rear window For open wheeled cars on top of the roll hoop or just in front of the cockpit works best It s best to have the correct length specified when ordering e GPS signals are easily blocked by electrical noise Keep the antenna more than 6 from any other antennas such as car to pit voice radios telemetry and other GPS antennas e For cars with live TV coverage cameras most of them send their signal at the same frequency as GPS Therefore you must separate the GPS antenna and wire to the opposite side of the car Keep the TV antenna and wire as far away as possible from the GPS antenna and wire e Keep the antenna outside any of any metal or carbon fiber enclosed space as these materials will block satellite signals Plastic duct tape as well as fabric convertible tops are generally ok e The antenna should be kept flat or parallel to the ground If mounted on a slope then the ability to receive signals will Race Grade Notes 7 decrease slightly Keep this in mind when mounting on a motorcycle as the bike leans from corner to c
7. option those channels which update at 20 Hz should be logged at 50 Hz GPS Date should only be logged at 1 Hz See the table above Race Grade Notes 9 12 Analysis Math GPS data will have an inherent time lag The sequence of delays are from receiving real time satellite signals processing them sending the data into the logger and the logger logging them MoTeC s i2 has a built in Corrected GPS function found under the Tools pull down menu This function should only be used with data originating from a ADL2 SDL or ACL Corrected GPS Properties Channels Latitude GPS Latitude 1 Speed GPS Speed mph Additional Channels ERE g Remove Corrections Eliminate duplicate samples via linear interpolation Time shift all GPS channels Auto 20 Manual Actual shift may vary You can use either the Auto function or manually adjust the time delay The 10 Hz unit typically has a delay of approximately 130 msec The 20 Hz unit typically has a delay of approximately 110 msec Race Grade Notes 10 Appendix GPS Engine Specifications 12 channel GPS engine Horizontal accuracy lt 1 meter at 95 with DGPS Update rate of 10 Hz or optional 20 Hz screw on SMA antenna connector 5 600 kbit s baud rate other rates available upon request NMEA message output types GGA and RMC other messages avallable upon request Optional CAN output bus speed of 1 Mbit s Digital output pulse
8. orner e Try to keep the antenna mounted on the centerline of the vehicle As with normal wheel speeds during cornering the speed of the inner side of the chassis Is less than the speed of the outer side of the chassis e The antenna has a magnet base to hold itself onto a metal surface If you use double sided tape or hook amp loop when removing please be careful not to remove the bottom silver sticker from the antenna This sticker has a metal film that help reject false signals and shield it from noise e Any extra antenna wire can be zip tied in a back and forth bundle Do not coil the extra antenna wire length in a circle or wrap it around anything Simply run the extra antenna wire back and forth Loss of Signal As mentioned earlier the antenna must see as many satellites as possible The antenna should have a clear view of the sky ideally a clear line of sight to the sky down to 5 degrees above the horizon If part of the sky is blocked by a building tree or bridge then the GPS unit will loose track of those satellites being blocked When this happens a reacquisition will take place which can take some length of time Loss of signal can occur when driving under bridges The size of the bridge and satellite location time of day has an impact on the acquisition of satellites You should always log your satellite count to be aware of what the antenna saw while traveling around the race track Race Grade Notes 8 GPS Qual
9. pal M GPS BL V2 vailable in 10 Hz or 20 Hz GPS Vehicle Speed Sensor LED NABLED 4Mbit FastStart ENAB E CAN 20Hz serial 9155 52 40HZ r USER MANUAL Version 2 2 Copyright JGM Automotive Tooling 2013 MoTeC Systems USA and RaceGrade are registered trademarks of JGM Automotive Tooling MoTeC is a registered trademark of MoTeC Pty The information in this document is subject to change without notice While every effort is taken to ensure correctness no responsibility will be taken for the consequences of any inaccuracies or omissions in this manual 17 October 2013 Race Grade GPS Page 2 Contents INTOduUCIO Ns 3 VV QUT AJ ING enana ia 4 Salus LEDS iia co eelieesds eased thant 4 O72 02 Serial OUMU ansias 5 CARN COUPE tna ead 5 20 HZ Update ODIOM sai 5 INStala ON arica 6 GPS RECEIVER a tiren 6 AMENNA PP CPC OO a a tae oleae esis 6 OSORIO las dosel oil 7 Setup for SDL ADL2 ADL3 ACL ooooncocccnccnccnoncncoconconononnnnos 8 12 Analysis Mati 9 PRO DG INCU sans 10 GPS Engine Specifications oocoocccocccoccconiconiconconnnonnnos 10 F OWED SUDD Y nailon iia 10 Operating Temperatueren 10 o eremere erect teen ce ee hee iets enn eer nee rner ee ae eee rr eee aene 11 CONNECCION secreto A Atos e la sed LE AE 11 Race Grade GPS Page 3 Introduction Thank you for purchasing a ace Grade GPS receiver This user s guide was written to help you understand how the Aazee Grade G
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