Jackson Labs Mini-JLT GNSS Manuel utilisateur

Mini-JLT GNSS™

User Manual

Document: 80200549

Version: 1.1

Date: 28 August, 2017

Mini-JLT GNSS™ User Manual

1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 General Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.1 Antenna Lightning Protector . . . . . . . . . . . . . . . . . . . . . 2

1.2.2 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.3 Power Connections. . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.4 Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . 2

2 Quick-Start Instructions . . . . . . . . . . . . . . . . . . . . . . 3

2.1 Powering Up the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.1.1 PCB Photos . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1.2 Mechanical Drawings . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1.3 Notes on Signal Interfacing. . . . . . . . . . . . . . . . . . . . . . 6

2.1.4 Coaxial Connectors. . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.3 Multi-GNSS Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.4 Connecting the GNSS Antenna . . . . . . . . . . . . . . . . . . . . . . 8

2.5 Remote serial control . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.6 Loop parameter adjustment . . . . . . . . . . . . . . . . . . . . . . . . 8

3 SCPI-Control Quick Start Instructions . . . . . . . . . . . . . . 11

3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2 General SCPI Commands . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2.1 Quick Start Commands . . . . . . . . . . . . . . . . . . . . . . . 11

3.2.2 *IDN? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2.3 HELP?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

3.3 GPS Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

3.3.1 GPS:SATellite . . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.3.2 GPS:SATellite:TRAcking:COUNt? . . . . . . . . . . . . . . . . . . .13

3.3.3 GPS:SATellite:VISible:COUNt? . . . . . . . . . . . . . . . . . . . . 13

3.3.4 NMEA Support . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.3.5 GPS:GPGGA . . . . . . . . . . . . . . . . . . . . . . . . . . .14

3.3.6 GPS:GGASTat . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.3.7 GPS:GPRMC . . . . . . . . . . . . . . . . . . . . . . . . . . .14

3.3.8 GPS:GPGSV . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.3.9 GPS:XYZSPeed . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.3.10GPS:GPZDA . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.3.11GPS:PASHR . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.3.12GPS:GYRO . . . . . . . . . . . . . . . . . . . . . . . . . . .16

3.3.13GPS:GYRO:CAL . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.3.14GPS:DYNAMic:MODE . . . . . . . . . . . . . . . . . . . . . . . 18

3.3.15GPS:DYNAMic:MODE 8 (Automatic Dynamic Mode) . . . . . . . . . . . 19

3.3.16GPS:DYNAMic:STATe? . . . . . . . . . . . . . . . . . . . . . . . 21

3.3.17GPS:REFerence:ADELay <float> <s | ns > [-32767ns,32767ns] . . . . . . .21

3.3.18GPS:REFerence:PULse:SAWtooth? . . . . . . . . . . . . . . . . . . 21

3.3.19GPS:RESET ONCE . . . . . . . . . . . . . . . . . . . . . . . . 21

3.3.20GPS:TMODe <ON|OFF|RSTSURV>. . . . . . . . . . . . . . . . . . 21

3.3.21GPS:SURVey ONCE. . . . . . . . . . . . . . . . . . . . . . . . 22

3.3.22GPS:SURVey:DURation <sec> . . . . . . . . . . . . . . . . . . . . 22

3.3.23GPS:SURVey:VARIANCE <mm2> . . . . . . . . . . . . . . . . . .22

Mini-JLT GNSS™ User Manual

3.3.24GPS:HOLD:POSition <cm, cm, cm> . . . . . . . . . . . . . . . . . 22

3.3.25GPS:SURVEY:STATus:DURation? . . . . . . . . . . . . . . . . . . 22

3.3.26GPS:SURVEY:STATUS? . . . . . . . . . . . . . . . . . . . . . . 22

3.3.27GPS:INITial:DATE <yyyy,mm,dd> . . . . . . . . . . . . . . . . . . 23

3.3.28GPS:INITial:TIME <hour,min,sec> . . . . . . . . . . . . . . . . . . 23

3.3.29GPS:SYSTem:SELect [GPS | SBAS | QZSS | GAL | BD ^ GLO] . . . . . . . 23

3.3.30GPS:JAMlevel? . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.3.31GPS:FWver? . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.3.32GPS?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.4 GYRO SUBSYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.4.1 GYRO:MODE <ON | OFF> . . . . . . . . . . . . . . . . . . . . . 24

3.4.2 GYRO:TRACE <int> [0,255]. . . . . . . . . . . . . . . . . . . . . 24

3.4.3 GYRO:CAL <float,float,float,float,float,float>. . . . . . . . . . . . . . . 24

3.4.4 GYRO:CAL:COMPUTE. . . . . . . . . . . . . . . . . . . . . . . 25

3.4.5 GYRO:SENS, GYRO:EFC, and GPS:CAL:RESET . . . . . . . . . . . . 25

3.4.6 GYRO:GLOAD? . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.5 PTIME Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.5.1 PTIMe:DATE? . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.5.2 PTIMe:TIME? . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.5.3 PTIMe:TIME:STRing? . . . . . . . . . . . . . . . . . . . . . . . 26

3.5.4 PTIMe:TINTerval? . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.5.5 PTIMe:LEAPsecond? . . . . . . . . . . . . . . . . . . . . . . . 26

3.5.6 PTIMe:LEAPsecond:PENDing? . . . . . . . . . . . . . . . . . . . 26

3.5.7 PTIMe:LEAPsecond:ACCumulated?. . . . . . . . . . . . . . . . . . 26

3.5.8 PTIMe:LEAPsecond:DATE? . . . . . . . . . . . . . . . . . . . . . 26

3.5.9 PTIMe:LEAPsecond:DURation? . . . . . . . . . . . . . . . . . . . 26

3.5.10PTIME? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.6 SYNChronization Subsystem . . . . . . . . . . . . . . . . . . . . . . . 27

3.6.1 SYNChronization:HOLDover:DURation? . . . . . . . . . . . . . . . . 27

3.6.2 SYNChronization:HOLDover:INITiate . . . . . . . . . . . . . . . . . 27

3.6.3 SYNChronization:HOLDover:RECovery:INITiate . . . . . . . . . . . . . 28

3.6.4 SYNChronization:SOURce:MODE . . . . . . . . . . . . . . . . . . 28

3.6.5 SYNChronization:SOURce:STATE? . . . . . . . . . . . . . . . . . . 28

3.6.6 SYNChronization:TINTerval? . . . . . . . . . . . . . . . . . . . . 28

3.6.7 SYNChronization:TINTerval:THReshold [50,2000] . . . . . . . . . . . . 28

3.6.8 SYNChronization:IMMEdiate. . . . . . . . . . . . . . . . . . . . . 28

3.6.9 SYNChronization:FEEstimate? . . . . . . . . . . . . . . . . . . . . 28

3.6.10SYNChronization:LOCKed? . . . . . . . . . . . . . . . . . . . . . 29

3.6.11SYNChronization:OUTput:1PPS:RESET [ON|OFF] . . . . . . . . . . . 29

3.6.12SYNChronization:health? . . . . . . . . . . . . . . . . . . . . . . 29

3.6.13SYNChronization?. . . . . . . . . . . . . . . . . . . . . . . . . 30

3.7 DIAGnostic Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.7.1 DIAGnostic:ROSCillator:EFControl:RELative? . . . . . . . . . . . . . . 30

3.7.2 DIAGnostic:ROSCillator:EFControl:ABSolute? . . . . . . . . . . . . . . 30

3.7.3 DIAGnostic:LIFetime:COUNt? . . . . . . . . . . . . . . . . . . . . 30

3.8 MEASURE Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.8.1 MEASure:VOLTage?. . . . . . . . . . . . . . . . . . . . . . . . 31

3.8.2 MEASure:CURRent?. . . . . . . . . . . . . . . . . . . . . . . . 31

3.8.3 MEASure? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3.9 SYSTEM Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3.9.1 SYSTem:COMMunicate . . . . . . . . . . . . . . . . . . . . . . 31

3.9.1.1 SYSTem:COMMunicate:SERial:ECHO . . . . . . . . . . . . . 31

Mini-JLT GNSS™ User Manual

3.9.1.2 SYSTem:COMMunicate:SERial:PROmpt . . . . . . . . . . . . . 31

3.9.1.3 SYSTem:COMMunicate:SERial:BAUD . . . . . . . . . . . . . .32

3.9.2 SYSTem:STATus? . . . . . . . . . . . . . . . . . . . . . . . . . 32

3.9.3 SYSTem:FACToryReset ONCE . . . . . . . . . . . . . . . . . . . 32

3.10SERVO Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . .32

3.10.1SERVo:FASTlock . . . . . . . . . . . . . . . . . . . . . . . . . 32

3.10.2SERVo:FALEngth . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.10.3SERVo:COARSeDac . . . . . . . . . . . . . . . . . . . . . . . .33

3.10.4SERVo:DACGain . . . . . . . . . . . . . . . . . . . . . . . . . 34

3.10.5SERVo: EFCScale . . . . . . . . . . . . . . . . . . . . . . . . . 34

3.10.6SERVo:EFCDamping . . . . . . . . . . . . . . . . . . . . . . . . 34

3.10.7SERVo:SLOPe . . . . . . . . . . . . . . . . . . . . . . . . . .34

3.10.8SERVo:TEMPCOmpensation . . . . . . . . . . . . . . . . . . . . . 34

3.10.9SERVo:AGINGcompensation. . . . . . . . . . . . . . . . . . . . . 34

3.10.10SERVo:PHASECOrrection . . . . . . . . . . . . . . . . . . . . . 34

3.10.11SERVo:1PPSoffset . . . . . . . . . . . . . . . . . . . . . . . . 35

3.10.12SERVo:TRACe . . . . . . . . . . . . . . . . . . . . . . . . . . 35

3.10.13SERVo? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4 Firmware Upgrade Instructions . . . . . . . . . . . . . . . . . . 37

4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

4.2 ISP Flash Loader Utility installation . . . . . . . . . . . . . . . . . . . . . 37

4.2.1 Philips LPC2000 Flash Utility . . . . . . . . . . . . . . . . . . . . . 37

4.2.2 Flash Magic Flash Programming Utility . . . . . . . . . . . . . . . . .38

4.3 Putting the PCB into In-Circuit Programming (ISP) mode . . . . . . . . . . . . 38

4.4 Downloading the firmware . . . . . . . . . . . . . . . . . . . . . . . . 38

4.4.1 Philips LPC2000 Flash Utility . . . . . . . . . . . . . . . . . . . . . 38

4.4.2 Flash Magic Flash Programming Utility . . . . . . . . . . . . . . . . .40

4.5 Verifying Firmware Update . . . . . . . . . . . . . . . . . . . . . . . . 43

5 GPSCon Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

5.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

5.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

5.3 Using GPSCon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

5.3.1 Setting the options . . . . . . . . . . . . . . . . . . . . . . . . . 45

5.3.1.1 Communication Parameters . . . . . . . . . . . . . . . . . .46

5.3.1.2 Auxiliary Parameters . . . . . . . . . . . . . . . . . . . . . 46

5.3.1.3 Traces Parameters . . . . . . . . . . . . . . . . . . . . . 47

5.3.2 Sending manual commands to the receiver . . . . . . . . . . . . . . .49

5.3.3 Using the Mouse in the Graph Window . . . . . . . . . . . . . . . . .49

5.3.4 Exporting the graphics . . . . . . . . . . . . . . . . . . . . . . .51

5.4 Interpreting the Data. . . . . . . . . . . . . . . . . . . . . . . . . . .52

6 Certification and Warranty . . . . . . . . . . . . . . . . . . . . .55

6.1 Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

6.1.1 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

6.1.2 Limitation of Warranty . . . . . . . . . . . . . . . . . . . . . . . . 55

6.1.3 Exclusive Remedies . . . . . . . . . . . . . . . . . . . . . . . .56

Mini-JLT GNSS™ User Manual

Introduction

1.1 Overview

The Mini-JLT GNSS board adds multi-GNSS support to the original Jackson Labs Mini-JLT GPSDO

with the addition of a GPS/Glonass/Galileo/BeiDou/QZSS/SBAS fixed-position timing receiver.

Jackson Labs Technologies, Inc. originally designed the Mini-JLT™ board to address a market

demand for replacing the end-of-life Trimble Navigation Limited Mini-T™ GPSDO units used in

existing customer projects. The board was designed to be form-fit-function compatible to the Trimble

units, with the exception of adding various features such as a 1PPS external input, 3-axis on-board

accelerometer, USB communication, internal antenna power supply, wide-range main power supply,

extended temperature range, lower overall height (0.8 inches vs. 0.5 inches above the PCB), and a

significantly improved thermal stability, Allan Deviation, and Phase Noise performance. The unit

also adds support for NMEA and SCPI communication commands, and removes support for TSIP

proprietary commands.

The Mini-JLT GNSS™ GPSDO uses a multi-GNSS receiver that can run in stationary (Position Hold

mode) and mobile mode to discipline an OCXO local oscillator to better than 1ppb frequency

accuracy. It supplies two 10MHz outputs. The board includes both TTL-level (RS-232 serial levels

optional) and USB serial control ports for NMEA and SCPI communication. The board operates

from a single +5V supply with 4.0V to 6.0V range, and has connectors to indicate GNSS and

External-Reference lock/presence. The board includes a high-performance GNSS receiver that can

acquire and track up to 72 GNSS signals down to a state of the art –167dBm (GPS and GLONASS),

a 32bit processor that runs a Real Time OS, one10MHz +5dBm legacy output, one optional 10MHz

+13dBm output, 1PPS UTC synchronized CMOS output, TTL/USB or optional RS-232 serial

control interfaces, and precision voltage references and DACs.

Mini-JLT GNSS™ User Manual

Figure 1.1 Mini-JLT GNSS™ GPSDO

1.2 General Safety Precautions

The following general safety precautions must be observed during all phases of operation of this

instrument. Failure to comply with these precautions or with specific warnings elsewhere in this

manual violates safety standards of design manufacture, and intended use of the instrument. Jackson

Labs Technologies, Inc. assumes no liability for the customer’s failure to comply with these

requirements.

1.2.1 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 lightning strike.

1.2.2 Grounding

To avoid damaging the sensitive electronic components in the Mini-JLT GNSS™ GSPDO always

make sure to discharge any built-up electrostatic charge to a good ground source, such as power

supply ground. This should be done before handling the circuit board or anything connected to it, i.e.

the GNSS antenna.

1.2.3 Power Connections

Make sure to connect the DC power to the device following the polarity indicated in Section 2.1 . Do

not reverse the power pins as this will cause serious damage to the circuit board.

1.2.4 Environmental 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

tables for the ac mains voltage requirements and ambient operating temperature range.

Mini-JLT GNSS™ User Manual

Quick-Start

Instructions

2.1 Powering Up the Unit

To operate the unit, simply follow these two steps:

1) Connect a 3.3V or 5V-compatible GNSS antenna to SMA connector J4. The antenna can

be passive or active. The Mini-JLT GNSS™ board will supply 3.3V to the antenna by

default, and this can be increased to up to 5.5V through the external antenna power supply

pin 5 of connector J1

2) Connect +5V (+/-1V) DC Power to J1 pin 6 on the unit, and ground to pin 4 of J1

[The unit will consume up to 8W of power during oscillator warmup]

The unit will now lock to GNSS signals (Red LED D1 is blinking when satellites are being received)

and will indicate proper lock and no events pending when the Green LED D1 goes on. Once the

green LED D1 is on, the unit will output 10MHz with 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 hours to

finish. The antenna should never be moved when the unit is set to run in

Position Hold mode as this would result in loss of frequency and timing

accuracy and incorrect GNSS fixes. The unit must be configured to mobile

mode using the GPS:TMODE OFF command when used in an application

where the antenna position can move during normal operation. Using the

Auto Survey process and Position Hold mode allows the unit to

over-determine the timing solution, and also allows TRAIM operation which

will result in slightly higher timing stability and more robust GNSS

reception in challenged environmental conditions such as under foliage, in

urban canyons, etc.

Please note that the GNSS receiver establishes the internal antenna gain right after

power-on, so for proper operation the GNSS antenna should always be connected prior

to turning on the +5V power.

Mini-JLT™ User Manual

Connect a terminal program (TeraTerm is recommended) to the unit via the TTL serial connector

pins on J1, or to the USB serial port, both with 115.2KB 8N1 and no flow-control.

WARNING: Do not connect RS-232 serial levels to connector J1, the unit may get

damaged from RS-232 serial levels on connector J1 as the default configuration is TTL

level.

Both the TTL serial port J1 and the USB port are internally “ored” together, so the user may send and

receive commands to/from both ports as long as commands are not sent to both ports at the same

time. Try some of these SCPI commands:

help?

syst:stat?

GPS?

sync?

meas?

2.1.1 PCB Photos

The Mini-JLT GNSS™ PCB is shown in Figure 2.1.

Figure 2.1 Mini-JLT GNSS™ Single Oven PCB

2.1.2 Mechanical Drawings

The following drawings show the mechanical dimensions and the pinout of the Mini-JLT GNSS™

PCB:

Jackson Labs Mini-JLT GNSS Manuel utilisateur

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