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Micro-JLT GNSS™ User Manual

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© 2019 Jackson Labs Technologies, Inc.

3.3.24GPS:RESET ONCE  . .   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  25
3.3.25GPS:TMODe <ON|OFF|RSTSURV>   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  25
3.3.26GPS:SURVey ONCE   .   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  26
3.3.27GPS:SURVey:DURation <sec>   . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  26
3.3.28GPS:SURVey:VARIANCE <mm^2> .   .   . . .   .   .   .   .   .   .   . .   .   .   . .   .  26
3.3.29GPS:HOLD:POSition <cm, cm, cm>.   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  26
3.3.30GPS:SURVEY:STATUS? . . . . . . . . . .   .   . .   .   .   . .   .   .   . .   .  26
3.3.31GPS:INITial:DATE <yyyy,mm,dd>   .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  27
3.3.32GPS:INITial:TIME <hour,min,sec> .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  27
3.3.33GPS:SYSTem:SELect [GPS | SBAS | QZSS | GAL | BD ^ GLO] .   .   .   .   . .   .  27
3.3.34GPS:JAMlevel? .   .   . .   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  27
3.3.35GPS:FWver? .   .   .   . .   .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .   .   . .   .  27
3.3.36GPS?.   .   . .   .   .   . .   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  28

3.4 GYRO SUBSYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.4.1 GYRO:MODE <ON|OFF> .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  28
3.4.2 GYRO:TRACE <int> [0,255].   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  28
3.4.3 GYRO:CAL <float,float,float,float,float,float>. .   .   .   . .   .   .   . .   .   .   . .   .  28
3.4.4 GYRO:CAL:COMPUTE.   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  28
3.4.5 GYRO:SENS, GYRO:EFC, and GPS:CAL:RESET .   . .   .   .   . .   .   .   . .   .  28
3.4.6 GYRO:GLOAD?    .   . .   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  28

3.5 PTIME Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.5.1 PTIMe:DATE?   .   .   . .   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  29
3.5.2 PTIMe:TIME?    .   .   . .   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  29
3.5.3 PTIMe:TIME:STRing?   .   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  29
3.5.4 PTIMe:TINTerval? .   . .   .   .   . . .   .   . .   .   .   .   . .   .   .   . .   .   .   . .   .  29
3.5.5 PTIMe:OUTput <ON|OFF>   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  29
3.5.6 PTIMe:LEAPsecond?   .   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  30
3.5.7 PTIMe:LEAPsecond:PENDing?   . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  30
3.5.8 PTIMe:LEAPsecond:ACCumulated?.   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  30
3.5.9 PTIMe:LEAPsecond:DATE? .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  31
3.5.10PTIMe:LEAPsecond:DURation?   . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  31
3.5.11PTIMe:STAMp Subsystem   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  31
3.5.12PTIMe:STAMp:MODE <OFF|ASYnc|MEMory|OUTput|DIFFer>  . .   .   .   . .   .  32
3.5.13PTIMe:STAMp:SOURce <GPS|EXTernal|ALL>   .   .   . .   .   .   . .   .   .   . .   .  33
3.5.14PTIMe:STAMp:DIFFer <ALL|EXT|GPS>  . . .   .   .   . .   .   .   . .   .   .   . .   .  34
3.5.15PTIMe:STAMp:FILTer [OFF | REL | DUR | PPS]  .   .   . .   .   .   . .   .   .   . .   .  34
3.5.16PTIMe:STAMp:FILTer:PPSecond <int> [1,100]    .   .   . .   .   .   . .   .   .   . .   .  36
3.5.17PTIMe:STAMp:FILTer:1PPeriod <int> [1,604800]    .   . .   .   .   . .   .   .   . .   .  37
3.5.18PTIMe:STAMp:LAST?  .   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  38
3.5.19PTIMe:STAMp:MEMory?  .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  38
3.5.20PTIMe:STAMp:RESET . . . . . . .   . . .   .   .   . .   .   .   . .   .   .   . .   .  38
3.5.21PTIMe:STAMp?.   .   . .   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  38
3.5.22PTIMe? .   . .   .   .   . .   .   .   . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  39

3.6 SYNChronization Subsystem . . . . . . . . . . . . . . . . . . . . . . . 39

3.6.1 SYNChronization:HOLDover:DURation?  . . .   .   .   .   .   .   .   . .   .   .   . .   .  40
3.6.2 SYNChronization:HOLDover:INITiate   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  40
3.6.3 SYNChronization:HOLDover:RECovery:INITiate .   .   . .   .   .   . .   .   .   . .   .  40
3.6.4 SYNChronization:SOURce:MODE <GPS|EXTernal|AUTO>    .   . .   .   .   . .   .  40
3.6.5 SYNChronization:SOURce:MODE:EDGE <NEGative|POSitive> . .   .   .   . .   .  41
3.6.6 SYNChronization:SOURce:STATE? .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  41
3.6.7 SYNChronization:HOLDover:STATE?  .   . . .   .   .   .   .   .   .   . .   .   .   . .   .  42
3.6.8 SYNChronization:TINTerval?    . . .   .   . . .   .   .   . .   .   .   . .   .   .   . .   .  42

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Содержание Micro-JLT GNSS

Страница 1: ...Micro JLT GNSS User Manual Document 80200550 Version 1 2 Date November 6 2019...

Страница 2: ...Micro JLT GNSS User Manual Copyright 2019 Jackson Labs Technologies Inc...

Страница 3: ...13 3 2 General SCPI Commands 13 3 2 1 Quick Start Commands 13 3 2 2 IDN 14 3 2 3 HELP 14 3 3 GPS Subsystem 14 3 3 1 GPS SATellite 15 3 3 2 GPS SATellite TRAcking COUNt 15 3 3 3 GPS SATellite VISible...

Страница 4: ...OUTput ON OFF 29 3 5 6 PTIMe LEAPsecond 30 3 5 7 PTIMe LEAPsecond PENDing 30 3 5 8 PTIMe LEAPsecond ACCumulated 30 3 5 9 PTIMe LEAPsecond DATE 31 3 5 10PTIMe LEAPsecond DURation 31 3 5 11PTIMe STAMp S...

Страница 5: ...te SERial PROmpt ON OFF 47 3 9 3 SYSTem COMMunicate SERial BAUD 9600 19200 38400 57600 115200 47 3 9 4 SYSTem STATus 47 3 9 5 SYSTem FACToryReset ONCE 47 3 9 6 SYSTem CPURESET 47 3 9 7 SYSTem ISP 48 3...

Страница 6: ...eters 64 5 3 1 2 Auxiliary Parameters 64 5 3 1 3 Traces Parameters 65 5 3 2 Sending manual commands to the receiver 67 5 3 3 Using the Mouse in the Graph Window 67 5 3 4 Exporting the graphics 69 5 4...

Страница 7: ...run in stationary Position Hold mode as well as 3D mobile mode to discipline either a single oven or optional double oven OCXO local oscillator to better than 0 1ppb frequency accuracy typically It s...

Страница 8: ...Antenna Lightning Protector Always use a UL approved and properly installed GNSS Antenna Lightning protector on the coaxial GNSS antenna feed to prevent damage injury and or death in case of a lightn...

Страница 9: ...Conditions This instrument is intended for indoor use It is designed to operate at a maximum relative non condensing humidity of 95 and at altitudes of up to 50 000 meters Refer to the specifications...

Страница 10: ...Micro JLT GNSS User Manual 4 2019 Jackson Labs Technologies Inc...

Страница 11: ...ith significantly better than 1ppb frequency accuracy By default the unit will be set to Position Hold mode and an antenna position Auto Survey process is started after power on that may take up to 3...

Страница 12: ...rt website page for free WARNING Do not connect RS 232 serial levels to connector J1 The unit may become damaged from RS 232 serial levels on connector J1 as the default configuration is RS 422 differ...

Страница 13: ...Micro JLT GNSS User Manual Figure 2 2 Micro JLT GNSS Double Oven PCB 2 1 2 Mechanical Drawings The following drawings show the mechanical dimensions and the pinout of the Micro JLT GNSS PCB Figure 2 3...

Страница 14: ...ive signal J1 Pin 7 RX Serial P RS 422 positive signal input RXD_TTL RS 422 level positive signal TTL level RS 422 positive signal TTL SCPI communications port input to unit J1 Pin 8 RX Serial N RS 42...

Страница 15: ...1 is equivalent to a standard 3 3V TTL serial output and may be used as such when used without termination If the Micro JLT GNSS is ordered with the TTL option pin 5 of connector J1 TXD_TTL pin 7 of c...

Страница 16: ...representation of UTC USNO available The selection of GNSS systems is made with the GPS SYST SEL command as detailed in Section 3 3 33 Because these systems operate at different carrier frequencies w...

Страница 17: ...high frequency accuracy typically better than 10 digits of frequency accuracy when locked to GNSS signals 2 5 Remote serial control The unit is controlled via the RS 422 TTL serial port at 115200 bau...

Страница 18: ...the Integral part of the PID loop This corrects phase offsets between the Micro JLT GNSS 1PPS signal and the UTC 1PPS signal as generated by the GNSS receiver Set higher values for tighter phase follo...

Страница 19: ...Micro JLT GNSS GNSDO Additional information regarding the SCPI protocol syntax can be found on the following web site http www ivifoundation org scpi A basic familiarity with the SCPI protocol is rec...

Страница 20: ...ight in MSL Meters rather than in GPS Meters on all commands that return antenna height the legacy Fury GPSDO uses GPS height The NMEA position fixes are in the WGS84 coordinate system while the X Y a...

Страница 21: ...tes PRN that the almanac predicts should be visible given date time and position 3 3 4 NMEA Support The following NMEA commands allow the Micro JLT GNSS GNSDO to be used as an industry standard naviga...

Страница 22: ...ports PJLTS and PJLTV Jackson Labs proprietary NMEA sentences PASHR and a proprietary version of the GGA sentence GGASTat described in Section 3 3 6 Please note that the position direction and speed d...

Страница 23: ...ion of the lock state variable The command allows capture of the position and other information available in the GGA command as well as tracking the lock state and health of the unit s OCXO performanc...

Страница 24: ...described in Section 3 3 4 3 3 10 GPS GPGSV int 0 255 This command instructs the Micro JLT GNSS to send the NMEA standard GSV message every N seconds with N in the interval 0 255 The command is disabl...

Страница 25: ...city in the y direction cm s ccccc is the velocity in the z direction cm s ddd is the speed accuracy estimate cm s eeeeeeeee is the GPS TOW in seconds ff is the current UTC leap second offset in secon...

Страница 26: ...00 0 00 8 00 0 00 0 0 46 21 Please note that the length of the string is fixed at 115 characters plus the two binary 0x0d 0x0a termination characters PASHR POS 0 aa bbbbbb 00 cccc ccccc d eeeee eeeee...

Страница 27: ...d is the lock status e eeeeeee is the EFC voltage ff ffff is the EFC percentage 0 to 100 g gEhh is the estimated frequency accuracy similar to 100s ADEV in scientific notation iii is the seconds in h...

Страница 28: ...for the most accurate GPS coordinates to be provided in high dynamic applications such as Jet aircraft Doppler tracking is enabled in all airborne modes as Carrier Phase tracking is very difficult to...

Страница 29: ...The current dynamic state being applied to the GNSS receiver can be queried with the command GPS DYNAMic STATe Please note that this command syntax has changed from previous products such as the FireF...

Страница 30: ...dynamics The dynamic state is always set to STATIONARY if one of the Position Hold Auto Survey stationary modes is selected using the command GPS TMODe as the Position Hold mode setting overrides any...

Страница 31: ...for a 0 0ns offset to the UTC 1PPS time pulse Change in this command will be effective after the next power cycle or after the GPS RESET ONCE command is sent 3 3 23 GPS REFerence PULse SAWtooth This...

Страница 32: ...he Survey when the minimal duration has been reached and the variance of the average position is under the specified minimum variance 3 3 28 GPS SURVey VARIANCE mm 2 This command specifies the minimum...

Страница 33: ...and positioning information for the NMEA data and to generate the 1PPS reference for the GNSDO The command is followed by a list of the shortened names of the GNSS systems to enable The shortened nam...

Страница 34: ...n the Micro JLT GNSS 3 4 3 GYRO CAL float float float float float float This command is not supported in the Micro JLT GNSS 3 4 4 GYRO CAL COMPUTE This command is not supported in the Micro JLT GNSS 3...

Страница 35: ...he local time is referenced to UTC time The hour minute and second is returned 3 5 3 PTIMe TIME STRing This query returns the current 24 hour time suitable for display for example 13 24 56 3 5 4 PTIMe...

Страница 36: ...ts in NV memory and applies them correctly even if the antenna is removed prior to the leapsecond as long as the pending information has been received and stored in NV memory and the unit has a proper...

Страница 37: ...3 5 11 PTIMe STAMp Subsystem This subsystem is unrelated to OCXO disciplining For more information on OCXO disciplining please refer to Section 3 6 The commands below are implemented for time stamping...

Страница 38: ...fer to Section 3 5 15 for more information on filters Lastly the time stamps can be outputted to the RS 422 TTL serial interface Please refer to Section 3 5 12 for more information on time stamp outpu...

Страница 39: ...E ASYnc command GPS time stamp 2059 520524 000000016 Below is few samples of the results displayed when using the PTIMe STAMp MODE OUTput or PTIMe STAMp MEMory commands 01 2060 167182 000000061 first...

Страница 40: ...ime stamps based on the type of filter By default the filter is in OFF mode which the filter is disabled allowing all time stamps to be processed Multiple filters can be enabled at onc except the OFF...

Страница 41: ...d command found in Section 3 5 16 Variable N is the stored pulse period limit specified with the PTIMe STAMp FILTer 1PPeriod command found in Section 3 5 17 By default variable M is set to 1 and varia...

Страница 42: ...cribed in Section 3 5 15 is disabled If this command is sent then the pulse storage period speci fied in the PTIMe STAMp FILTer 1PPeriod command in Section 3 5 17 will be reset to one The maximum numb...

Страница 43: ...abled If this command is sent then the limit of stored time stamps specified in the PTIMe STAMp FILTer PPSecond command in Section 3 5 16 will be reset to one The maximum number of pulse period is one...

Страница 44: ...more information on OCXO disciplining please refer to Section 3 6 This query returns all 100 most recent time stamps at once These time stamps are in GPS time for mat with week number and week second...

Страница 45: ...ore information on time stamping please refer to Section 3 5 11 This subsystem regroups the commands related to the synchronization of the Micro JLT GNSS with the GNSS receiver The list of the command...

Страница 46: ...exit the holdover state even while GNSS signals are still being properly received This forced holdover allows the unit to effectively disable GNSS locking while still keeping track of the state of the...

Страница 47: ...SOURce MODE EDGE NEGative POSitive This command configures the triggering edge of the external PPS input source Pin 3 of J4 connector shown in Figure 3 1 for both OCXO disciplining discussed in Sectio...

Страница 48: ...he reference 1PPS at which point the unit will initiate a counter reset jam sync aligning the oscillator driven 1PPS with the reference 1PPS phase The oscillator phase is slowly and continuously adjus...

Страница 49: ...he 1PPS output signal is disabled until proper GNSS lock is achieved 3 6 14 SYNChronization OUTput 1PPS RESET This query returns the state of the SYNC OUT 1PPS RESET command and may return ON or OFF 3...

Страница 50: ...lts in 0x40 0x10 0x4 0x54 The unit would thus indicate HEALTH STATUS 0x54 A health status of 0x0 indicates a properly locked and warmed up unit that is completely healthy and does not have any pending...

Страница 51: ...t DIAGnostic 3 7 1 DIAGnostic ROSCillator EFControl RELative This query returns the Electronic Frequency Control EFC output value of the internal reference oscillator It returns a percentage value bet...

Страница 52: ...Sure POWersupply This query returns the power supply voltage applied to the Micro JLT GNSS board 3 8 3 MEASure POWersupply VOSCillator This query returns the power supply voltage applied to the OCXO w...

Страница 53: ...always 8 bit 1 stop bit no parity no HW flow control Upon Factory reset the speed is set at 115200 bauds Higher baud rates such as 115200 are suggested if several NMEA commands are enabled or high ra...

Страница 54: ...tion float 10 0 10 0 SERVo PHASECOrrection float 500 0 500 0 SERVo COARSedac int 0 255 SERVo 1PPSoffset int ns 5000000 5000000 SERVo TRACe int 0 255 SERVo FASTlock int 1 20 SERVo FALEngth int 100 2000...

Страница 55: ...ERVo FASTlock 3 10 2 SERVo FALEngth int 100 20000 This command adjusts the length of time during which the FASTLOCK feature is active please see the command SERVo FASTlock above The length can be set...

Страница 56: ...ill query the state of this command SERVo EFCScale 3 10 6 SERVo EFCDamping int 2 4000 This command sets the Low Pass filter effectiveness of the DAC Values from 2 to 50 are typically used Larger value...

Страница 57: ...ill query the state of this command SERVo PHASECOrrection 3 10 11 SERVo 1PPSoffset int ns 5000000 5000000 This command sets the Micro JLT GNSS 1PPS signal s offset to UTC in 5 55ns steps The maximum c...

Страница 58: ...SERVo This command returns the result of the following queries SERVo DACGain SERVo EFCScale SERVo PHASECOrrection SERVo EFCDamping SERVo SLOPe SERVo COARSedac SERVo AGINGcompensation SERVo 1PPSoffset...

Страница 59: ...link provided below Alternatively you can also use the Flash magic utility to perform the same upgrade The JLTerm application is available for download at http www jackson labs com index php support T...

Страница 60: ...ownload The Micro JLT GNSS is RS 422 level TTL compatible An RS 422 TTL to RS 232 converter must be used when connecting to the computer s RS 232 serial port or to industry standard RS 232 to USB adap...

Страница 61: ...rogramming begins Figure 4 2 Properly Program the unit in ISP mode It is important to put the device in ISP mode prior to conducting a firmware upgrade Failure to send the SYST ISP command may result...

Страница 62: ...as shown in Figure 4 4 This will begin to download the firmware automatically and reset the board If there is a failure or error please refer to the next step Figure 4 4 Open Hex File and Download Fir...

Страница 63: ...the Flash Magic Programming Utility A Open the Flash Magic utility Select the correct Device LPC1833 by clicking Change and select LPC1800 LPC1833 If Flash Magic version is 11 20 or older skip to Sect...

Страница 64: ...to browse for the hex file that you downloaded in Section 4 4 E Check again for the Erase option Sectors used by file in Figure 4 7 F Go to Start section and press the gray start button You will obse...

Страница 65: ...2019 Jackson Labs Technologies Inc 59 Micro JLT GNSS User Manual Figure 4 8 Flash Magic Programming Utility Classic Version Figure 4 9 Required Flash Magic Communications Options...

Страница 66: ...r Figure 4 10 Device selection window C Expand the ARM CORTEX folder and select the appropriate processor in this case the LPC1833 Figure 4 11 Expanded device selection window D Select the Baud Rate o...

Страница 67: ...d the warranty G Under Step 3 Hex File browse for the hex file that you downloaded in Section 4 4 H Under Step 4 Options check Activate Flash Bank I Go to Step 5 and press Start You will observe the f...

Страница 68: ...Micro JLT GNSS User Manual 62 2019 Jackson Labs Technologies Inc...

Страница 69: ...m index php support 5 2 Installation Extract the contents of the ZIP file downloaded from the Jackson Lab s website and execute the MSI installer Follow the on screen instructions to complete the inst...

Страница 70: ...for your computer s serial port connection and set the baud rate to 115200 parity to None Data Bits to 8 and Stop Bits to 1 Set Flow Control to None Once you have configured the communication paramet...

Страница 71: ...pressing the wrench icon you can select the Traces tab and configure the trace labels and vertical plot ranges See Figure 5 4 for an example of an auxiliary measurement The labels and parameters are c...

Страница 72: ...Micro JLT GNSS User Manual 66 2019 Jackson Labs Technologies Inc Figure 5 3 Auxiliary Parameters window Figure 5 4 Traces Parameters window...

Страница 73: ...ver over the buttons to see the exact command that is sent Figure 5 5 Sending manual commands 5 3 3 Using the Mouse in the Graph Window Refer to Figure 5 6 for the following description The default vi...

Страница 74: ...t becomes the left end of the curve Then similarly click the right mouse button on the curve at the time you wish to be the right most portion of the magnified curve and it immediately becomes the end...

Страница 75: ...the entire logfile contents Use the checkbox Export all graph data to make this choice You may select a size of the exported images in X and Y The file format may be BMP JPG GIF or PNG Your settings w...

Страница 76: ...unit over a period of more than 200 hours The red trace is EFC crystal frequency control voltage The crystal is aging becoming faster in frequency over time This requires the control voltage to be low...

Страница 77: ...the OCXO in the evenings heating it up and thus making the unit use lower power during that event In Figure 5 9 which is a zoom of Figure 5 8 we can see the phase offset error of the internal OCXO to...

Страница 78: ...Micro JLT GNSS User Manual 72 2019 Jackson Labs Technologies Inc...

Страница 79: ...stomer shall prepay shipping charges and shall pay all duties and taxes for products returned to Jackson Labs Technologies Inc for warranty service Except for products returned to Customer from anothe...

Страница 80: ...ackson Labs Technologies Inc products are not intended for use in medical life saving or life sustaining applications 6 1 3 Exclusive Remedies THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND...

Страница 81: ...Second int 1 100 Added Section 3 5 17 PTIMe STAMp FILTer 1PPeriod int 1 604800 Added Section 3 5 18 PTIMe STAMp LAST Added Section 3 5 19 PTIMe STAMp MEMory Added Section 3 5 20 PTIMe STAMp RESET Adde...

Страница 82: ...5 22 PTIMe Updated Section 3 6 1 SYNChronization HOLDover DURation Updated Section 3 6 2 SYNChronization HOLDover INITiate Updated Section 3 6 3 SYNChronization HOLDover RECovery INITiate Updated Sec...

Страница 83: ...on 4 2 ISP Flash Loader Utility installation Updated Section 4 3 Putting the PCB into In Circuit Programming ISP mode Updated Section 4 4 Downloading the firmware Updated Section 4 4 3 Using the Flash...

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