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Orolia GNSSource-1000 User Manual

Smart, low-cost & high performance gnss ocxo reference source
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19 December 2022
GNSSource-1000
Smart, Low-Cost & High Performance GNSS OCXO
Reference Source
User Manual
Document Part No: GNSSource-1000_Manual
Revision: 191222

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Summary of Contents for Orolia GNSSource-1000

  • Page 1 19 December 2022 GNSSource-1000 Smart, Low-Cost & High Performance GNSS OCXO Reference Source User Manual Document Part No: GNSSource-1000_Manual Revision: 191222...

  • Page 2: Table Of Contents

    Contents Introduction ..........................................4 Before Getting Started ..................................... 4 Unpacking ........................................4 Safety! ..........................................5 Environmental Responsibility ................................5 Installation Procedure .................................... 5 2.4.1 Connections ..................................... 5 2.4.2 Software Monitoring ................................6 System Operations ......................................7 Operating Modes ...................................... 7 Operating Mode Setup ..................................
  • Page 3 5.11 The NMEA messages ................................... 69 5.11.1 Conditions : .................................... 69 5.11.2 Messages activation: ................................69 5.11.3 Messages cancellation: ..............................69 5.11.4 The NMEA messages list: ..............................69 5.11.5 Message NMEA $PTNTA ..............................70 5.11.6 Message NMEA $PTNTS,B ............................. 70 5.11.7 Message NMEA $GPRMC ...............................

  • Page 4: Introduction

    The GNSSource-1000 has been specifically designed for cross industry applications, including telecom and calibration, requiring extremely stable and precise timing or frequency source. The GNSSource-1000 integrates a GPS receiver, a smart GPS-disciplined OCXO clock, and distributes multiple output signals, either phase or frequency aligned depending on the operating modes.

  • Page 5: Safety

    Orolia Switzerland SA to ensure proper disposal. • To return the appliance : Download and fill up the RMA form (from orolia.com) and send it to clocksupport@orolia.com Once the RMA is approved, we will contact you with shipment process details.

  • Page 6: Software Monitoring

    5V/30 mA for the amplifier. c) GNSSource-1000 is CE tested only for an antenna cable less than 30 meters (98’). Connect a COM cable between J2 and one COM available of your computer for RS232 commands and monitoring (if required).

  • Page 7: System Operations

    GNSSource 1000 User Manual 3. System Operations 3.1 Operating Modes The GNSSource-1000 integrates a smart GXClock-500 module integrating a GNSS receiver. It provides 4 basic modes of operation as follows: Free Run: When the GXClock is not locked to a GNSS reference and, thus, is free running Track: When the GNSS reference is used to perform frequency alignment applications.

  • Page 8: System Description

    GNSSource 1000 User Manual 4. System Description 4.1 Block diagram Figure 3-1 Building block of the GXClock-500 module inside the GNSSource-1000 8 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...

  • Page 9: The Timing And Tracking System Of The Gxclock

    PPSREF. The calculation is used to adjust the time constant of the tracking loop. This way, a noisy PPSREF can be directly connected to the device without adjustments by hard or software. orolia.com GNSSource-1000 Manual | 9 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 10: The "Track" Mode And The "Sync" Mode

    Cxxxx, change the value in use and store it in the EEPROM. • At the beginning of a tracking, the value in use is the one of the EEPROM. 10 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...

  • Page 11: The Pps Tracking Loop

    TWddd. For the GXClock, the default value is ± 60µs. For more details, see the Chapter “TIMING AND TRACKING COMMANDS”. Figure 3-5 Tracking limits. orolia.com GNSSource-1000 Manual | 11 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 12: Frequency Fluctuations During The Tracking

    EEPROM memory. The built-in serial interface allows an automatic parameter adjustment during the manufacturing. The serial interface serves also for the monitoring and tuning of the internal parameters and the PPS facilities. 12 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 13: Serial Interface Connection

    Even if MAv06:4 parameter is settled to cancel the writing in eeprom of FC, a writing in eeprom is anyway possible if the command FCsddddd is followed by the command FS3 orolia.com GNSSource-1000 Manual | 13 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 14: Center Frequency Read-Back

    Like the 1 character commands, this commands use the serial port 1. 5.1 INFORMATION COMMANDS Identification. Serial number. General Status. Beat a message (every second) on the serial port. View PPSRef Sigma. View Time constant. 14 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...

  • Page 15: Tracking Commands

    Send out the time of day. TDhh:mm:ss Set the time of day. 5.5 SETTING COMMANDS FCsddddd Change frequency. MAvxx.. Module adjust. Set and read internal parameters. 5.6 OTHER COMMANDS FREEZEx Freeze frequency. RESET Hot Reset. orolia.com GNSSource-1000 Manual | 15 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 16 ID<CR><LF> Identification. Answer: SPTSXO-002/rr/s.ss<CR><LF> revision number s.ss: software version Factory setting: EEPROM modification : No Data in : FLASH MAv access : Reset value: Example Command Answer Comment ID<CR> SPTSXO-002/00/2.10<CR><LF> - 16 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 17 INFORMATION COMMAND: Serial number. SN<CR><LF> Serial number. Answer: aaaaaa<CR><LF> aaaaaa: 6 characters serial number Factory setting: EEPROM modification : No MAv access: Reset value: Example Command Answer Comment SN<CR> G00098<CR><LF> - orolia.com GNSSource-1000 Manual | 17 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 18 The Status is also transmitted every second with BT5, BT7. • The Status is also included in the NMEA messages $PTNTA, $PTNTS,B. Example Command Answer Comment ST<CR> 4<CR><LF> Status=4, free run. 18 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 19 Seconds elapsed since 2000-01-01 00:00:00. nnnnnnnnn: Residual in ns. Rounded to: 50ns. (GXClock) BT9<CR><LF> Send GPS receiver message status as soon GPS messages are arrived Answer: x<CR><LF> BT9 Note BTA<CR><LF> Beat NMEA message $PTNTA orolia.com GNSSource-1000 Manual | 19 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 20 This command is just for debugging. To store a beat behavior in EEPROM, one should use MAv parameters 0x0B and 0x0C. Example Command Answer Comment BT5<CR> ..3<CR><LF>..3<CR><LF>.. Status=3, sync, in tracking. 20 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 21 EEPROM modification : No Data in : MAv access : Reset value: 000.0 Note • Measurement time interval: 1 second. Example Command Answer Comment VS<CR> 005.3<CR><LF> Means Time Variance @1s of 5.3 10 orolia.com GNSSource-1000 Manual | 21 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 22 EEPROM modification : No Data in : MAv access : 000100 in automatic mode, Reset value: settled time constant otherwise Example Command Answer Comment VT<CR> 001000<CR><LF> Time constant of 1000 second 22 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 23 • Every TR1 command induces a new tracking start. • The value stored in EEPROM can only be changed with the MAv system. Example Command Answer Comment TR1<CR> 1<CR><LF> Tracking start. orolia.com GNSSource-1000 Manual | 23 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 24 The commands SY1 and DE000000000 are equivalent in tracking. • The value stored in EEPROM can only be changed with the MAv system. Example Command Answer Comment SY1<CR> 1<CR><LF> Synchronization PPSOUT - PPSINT. 24 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 25 A value of 000 means no checking. In such situation, an alarm is raised up in case of a calculation overflow (approx +/-500 µs). Example Command Answer Comment AW???<CR> 040<CR><LF> - orolia.com GNSSource-1000 Manual | 25 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 26 • A value of 000 means no checking. In such situation, the tracking is stopped in case of a calculation overflow (approx +/-500 µs. Example Command Answer Comment TW???<CR> 120<CR><LF> - 26 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 27 In automatic mode, if the time interval PPSREF vs PPSINT go out of the fine phase comparator range, approx. +/-500 ns, the time constant goes slowly to 1000 s. Example Command Answer Comment TC??????<CR> 000000<CR><LF> automatic mode orolia.com GNSSource-1000 Manual | 27 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 28 In frequency save mode 1, the saving is only done if the GXClock is in track state. (General Status 2 or 3). • If PPSREF are missing or rejected, the 24 hours period is increased. Example Command Answer Comment FS?<CR> 1<CR><LF> In tracking, frequency saved every 24 hours. 28 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 29 RAM, EEPROM MAv access : Reset value: last value stored in EEPROM. Note • Usefull for precise phase calibration. Example Command Answer Comment CO????<CR> +000<CR><LF> In tracking, no fine phase offset. orolia.com GNSSource-1000 Manual | 29 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 30 This command has an influence on the delay value, command DEddddddd, as the delay is in fact referenced to PPSINT. Example Command Answer Comment RA+001<CR> +001<CR><LF> 50 ns ahead jump of PPSINT. 30 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 31 Data in : RAM, EEPROM MAv access : Reset value: last value stored in EEPROM Example Command Answer Comment PW100000000<CR> 100000000<CR><LF> Setting a PPSOUT pulse width of 1/10 second orolia.com GNSSource-1000 Manual | 31 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 32 After a command SY1, PPSOUT is aligned to PPSINT and DE=000000000. • Setting command: the answer is the just entered value. • Interrogation command: the answer is the measured value. Example Command Answer Comment DE?????????<CR> 000000000<CR><LF> - 32 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 33 PP002000<CR> 002000<CR><LF> pulse every 2 seconds. Synchronized to even GPS second. PP002001<CR> 002001<CR><LF> pulse every 2 seconds. Synchronized to odd GPS second. PP060000<CR> 060000<CR><LF> pulse every minute. Synchronized to minute since GPS epoch. orolia.com GNSSource-1000 Manual | 33 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 34 After reception of this command, the device responds following the rules of the command BTx. This means the answer is not immediate, but can be delayed up to 1 s. • The calendar works from 2000-01-01 to 2099-12-31. Example Command Answer Comment DT<CR> 2008-04-28<CR><LF> - 34 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 35 After reception of this command, the device responds following the rules of the command BTx. This means the answer is not immediate, but can be delayed up to 1 s. • The calendar works from 2000-01-01 to 2099-12-31. Example Command Answer Comment DT2008-04-29<CR> 2008-04-29<CR><LF> - orolia.com GNSSource-1000 Manual | 35 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 36 After reception of this command, the device responds following the rules of the command BTx. This means the answer is not immediate, but can be delayed up to 1 s. Example Command Answer Comment TD<CR> 15:08:38<CR><LF> - 36 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 37 As the answer is coming after the next PPSINT, it is 1 second ahead. Example Command Answer Comment The difference from 37 to 38 seconds is due to the pulse - message TD08:25:37<CR> 08:25:38<CR><LF> system. orolia.com GNSSource-1000 Manual | 37 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 38 The command FC?????? is useful to know the frequency actually in use. But the command BTB gives the 3 frequencies: actual, holdover, eeprom Example Command Answer Comment FC+00100<CR> +00100<CR><LF> 10’000’000.000 Hz becomes approx.10’000’000.025Hz. 38 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 39 8 byte, type=y6 yyyyyyyyyyyyyyyy: signed 8 byte, type=y7 string ascii, type=y8 Parameter (z): aaaaaa..: up to 24 characters Answer: <CR><LF> MATxx<CR><LF> Read data type of the parameter number xx. Answer: xy<CR><LF> orolia.com GNSSource-1000 Manual | 39 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 40 * Warning: This command can acting into non volatile memory. Numbers of commands sent during the whole unit life time limited to 100'000 in total (all commands cumulated). Example Command Answer Comment MAH05<CR> Timing / Frequency<CR><LF> Timing/frequency flags. 40 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 41 RAM, EEPROM MAv access : Reset value: Last value stored in EEPROM. Notes • No tracking possible. • Status=7 is issued in this state. Example Command Answer Comment FREEZE?<CR> 0<CR><LF> - orolia.com GNSSource-1000 Manual | 41 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 42 All parameters will be loaded with their EEPROM default value. • During a Hot Reset, a partial hardware initialization is done. It is to avoid when a long term stability test is underway. Example Command Answer Comment RESET<CR> SPTSXO-002/00/2.10<CR><LF> - 42 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...

  • Page 43: Device Status

    5 PPSREF unstable(holdover) The stability of the PPSREF is too low to be tracked. 6 No PPSREF(holdover) No PPSREF was detected. 7 Frequency frozen Frequency is frozen. 8 factory used 9 Fault orolia.com GNSSource-1000 Manual | 43 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 44: The Mavxx.. Command Is A Computer And Human Oriented Command To Tune Quickly

    The actual function of this flag is to transmit or not a message, data type y = 8,9, at power-on, Reset. Currently, only MAv00, Factory welcome message and MAv01, User welcome message, are concerned. 44 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 45: Mavxx

    GPS resource utilization 0x24 s 4byte 0x00000000 GPS longitude 0x25 s 4byte 0x00000000 GPS latitude 0x26 s 4byte 0x00000000 GPS altitude 0x27 s 2byte 0x0010 Time GPS-UTC offset u: unsigned, s:signed orolia.com GNSSource-1000 Manual | 45 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 46 To read the behavior : MAB00<CR> Answer : 0 : cancelled; 1 : activated • To cancel the message : MAC00<CR> • To activate the message : MAA00<CR> Changing the message behavior with the Monitoring program: 46 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 47 To read the behavior : MAB00<CR> Answer : 0 : cancelled; 1 : activated • To cancel the message : MAC01<CR> • To activate the message : MAA01<CR> Changing the message behavior with the Monitoring program: orolia.com GNSSource-1000 Manual | 47 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 48 If activated, the messages are transmitted in following order : 0x00, 0x01, 0x30, etc.. As it is stored in eeprom, it can be modified. Currently this parameter did not apply to GXClok. 48 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 49 0x04 (this one), to low. Pulse width to 0, command PW000000000. PPSOUT cadence to null, command PP000000. Bit 5 • Bit5 is active only if Bit4 is not active orolia.com GNSSource-1000 Manual | 49 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 50 GNSSource 1000 User Manual Changing timing and frequency flags with the Monitoring program : 50 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 51 The "Sync" value can also be changed with the command SYx. bit 0, Track The "Track" value can also be changed with the command TRx. Changing tracking start flags with the Monitoring program: orolia.com GNSSource-1000 Manual | 51 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 52 During free run, with the command FCsddddd. • During a tracking. bit 2, restart tracking After 254 seconds with a PPSREF out of tracking window, but stable, a new tracking is initiated if this flag is set. 52 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 53 PPSRef changes more than ± 2 comparator steps, Status = 5 is issued. For the GXClock that means a frequency offset of ± 4e-9. Changing tracking start flags with the Monitoring program: orolia.com GNSSource-1000 Manual | 53 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 54 Related to command @@@@XOF. See special_commands for more information. bit 0, ? by unknown command Although the new value is stored in eeprom, the new behavior is active immediately. Changing communication flags with the Monitoring program : 54 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 55 Changing the value in eeprom: the new parameter is taken account after power on / reset. . Warning This parameter is not taken account in the GXClock, sw 2.10. It is supposed the device is always stationary. orolia.com GNSSource-1000 Manual | 55 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 56 Position information of message $GPRMC is updated as soon as new information from the GPS receiver are available. This mean if this message is activated 4 times, position information may vary. • For quick debugging command can also be used. 56 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 57 Status determination system in order to cancel a too fast going in tracking. This delay is mainly intended for situations where the tracking state is permanently settled by software or by hardware. The unit of the delay is 32 seconds. orolia.com GNSSource-1000 Manual | 57 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 58 • The pulse width is rounded to 50 ns in the GXClock. • See also command PWddddddddd. • 0x000186A0 equal 100'000 ns. Changing the pulse width with the Monitoring program : 58 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 59 Tracking window in use. • In tracking, no error as long | ppsint - ppsref | < Tracking window. • See also command TWddd. Changing the tracking window with the Monitoring program : orolia.com GNSSource-1000 Manual | 59 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 60 Alarm window in use. • In tracking, no alarm as long | ppsint - ppsref | < Alarm window. • See also command AWddd. Changing the alarm window with the Monitoring program : 60 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 61 Time constant of the tracking loop in second. • For the GXClock, from 100 seconds to 10’000 seconds. • See also command TCdddddd. Changing the tracking loop time constant with the Monitoring program : orolia.com GNSSource-1000 Manual | 61 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 62 Changing the value in eeprom: the new parameter is taken account after power on / reset. More information • Fine comparator offset in approx. ns. • + 127 / -128 range. • See also command COsddd. Changing the fine comparator offset with the Monitoring program : 62 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 63 Changing the value in eeprom: the new parameter is taken account after power on / reset. More information • PPSOUT cadence . • 1 pulse every 1 to 255 second. • See also command PPdddeee. Changing the PPSOUT cadence with the Monitoring program : orolia.com GNSSource-1000 Manual | 63 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 64 Offset in second to GPS origin that is 1980-01-06 00:00:00. • In fact useful in pp2s situation to choose in between odd or even pulse. • See also command PPdddeee. Changing the PPSOUT origin with the Monitoring program : 64 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 65 Parameter ram eeprom flash Data type Value(default) Help 0x20 u 1byte 0x00 GPS type Description GXClock, sw 2.10: This parameter is just indicative. Only the GPS language, Parameter 0x21 is considered. orolia.com GNSSource-1000 Manual | 65 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 66 Situation in October 2012, sw2.10 : It is recommended to work with 2 languages: 0x04 UBlox LEA-xT. 0x08 NMEA $GPRMC. Other languages are possible, but it is recommended to inform SpectraTime before to work with them. Typical configuration for LEA-xT: 66 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 67 More information about some bit bit 0, Consider GPS messages to track If this bit is settled and the expected GPS messages are not present, it will be Status=6 in tracking. Typical configuration for LEA-xT: orolia.com GNSSource-1000 Manual | 67 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 68: Serial Communication Interface 2

    In the iSync, the Micro-Controller has a second serial port dedicated to the communication with a GPS. In the GXClock the GPS is embedded and there is no external connection to this port. 68 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 69: The Nmea Messages

    Messages activated with the MAv parameters 0x0B and 0x0C can be temporary cancelled with the commands MAW0B00 and MAW0C00. And permanently cancelled after power-on / Reset with the commands MAS0B00 and MAS0C00. 5.11.4 The NMEA messages list: $PTNTA $PTNTS,B $GPRMC $GPZDA orolia.com GNSSource-1000 Manual | 69 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 70: Message Nmea $Ptnta

    5.11.6 Message NMEA $PTNTS,B Proprietary SpectraTime details iSync indicator. ~3ms ~250ms ~500ms ~750ms BTB, MAWØBØB MAWØBBØ MAWØCØB MAWØCBØ Activation commands MASØBØB MASØBBØ MASØCØB MASØCBØ Activation after power on Ø : zero. 70 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 71 0: fixed value, 1: automatic. 001500: loop time constant in use, from 000100 to 999999 seconds. ,001.50: sigma (1s) of PPSRef in approx. ns. *16: xor checksum in between $ and *. orolia.com GNSSource-1000 Manual | 71 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 72: Message Nmea $Gprmc

    A correct message from a GPS device is present. The position information of the GPS message is correct. • In the standard configuration the GXClock is able to manage a leap second correction during a holdover. 72 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...

  • Page 73: Message Nmea $Gpzda

    Exemple: $GPZDA,133358,09,05,2007,,*4E<CR><LF> $GPZDA : message header that never change. 133358 : hour, minute, second in UTC. : day. : month. 2007 : year. : xor checksum in between $ and *. orolia.com GNSSource-1000 Manual | 73 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 74: The Nmea $Gprmc Mode

    The bit 3 of parameter 0x05 must be settled, so the incoming $GPRMC messages will be accepted. This can be done with Hyperterminal : p.ex. : MAW0518 in ram. To store this behavior permanently in eeprom : MAS0518. With the Monitoring program : 74 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 75: Special Commands

    Outgoing messages are not stopped. Remark Messages transmitted normally by the iSync on TXD1 and to TXD2 are not stopped. To stop them: BT0, MAW0B00, MAW0C00 and MAW2100 @@@@XON<CR>[<LF>] Command @@@@XOF Cancellation of command. orolia.com GNSSource-1000 Manual | 75 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 76: Time Of Day Command Synchronization

    • TD17:00:00 means it was 17:00:00 at the last ppsint. • The safe message arrival interval is approx. 3 ms after reference PPSINT and 50 ms before next PPSINT. • Remark: with SY1 PPSINT and PPSOUT are aligned. 76 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 77: Time Tagging On The Ppsref Input And The Bt8 Command

    3 Date / Time 2 Granularity 1 ND 0 Validation Typical BT9 messages for some GPS : GPS type Param. 0x21 Param. 0x22 Good working message LEA-xT 0x04 0x1D 10400C01 NMEA $GPRMC 0x08 0x19 orolia.com GNSSource-1000 Manual | 77 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 78: Time And Date In Use In The Isync Clock

    In really noisy environment, with ppsref jumps larger than 500 ns, it is recommended to not work in automatic time constant mode because the time constant will never go over 1000 seconds. The following relationship is available: (ppsref noise)[ns] x 100.0 -> (time constant)[s] 78 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...

  • Page 79: Gxclock Simplified State Machine And Status Indication

    |holdover|, |tracking| possible are not showed here. • The transition from |tracking setup| to |tracking| goes for a short time through |holdover|. That is why Status=5 can appear for a short time in such situation. orolia.com GNSSource-1000 Manual | 79 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 80: Annexes

    Click on "Track now". If the PPSOUT must be aligned to the PPSREF, click also on "Sync now". With iSync Manager, Timing+Tracking/MAvxx..,parameter 0x05 Activate bit 0 on RAM Then "Write". If the PPSOUT must be aligned to the PPSREF, activate also bit 1. With iSync Manager, Command/Terminal 80 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...
  • Page 81 To align the PPSOUT to the PPSREF, send "SY1". Remark: "SY1" can also be sent whenever before. When the Sync mode is active, the final Status becomes 3. To cancel BT7, send "BT0". orolia.com GNSSource-1000 Manual | 81 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 82: Automatic Start Of The Tracking

    Just after Power ON, the GPS can generate a bad PPSREF. It is therefore recommended to allow the restart of tracking if the PPSREF changes its position. This can be made with the bit 2 of the MAv parameter 0x06: 82 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 83: Low Time Interval Error With The Ppsref From The Gps

    The value can be changed with the command COsddd or with the MAv parameter 0x16. Here an offset of 100 ns is added to the fine phase comparator. This make it works outside of the zero area. orolia.com GNSSource-1000 Manual | 83 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 84: Very Good Short Term Frequency Stability

    MAv parameter 0x04, bit 4 must be put to 0 and bit 5 must be put to1. MAv parameter 0x22, the bit 0 must be put to 0. And to avoid any interference of the still messaging GPS, MAv parameter 0x21, can be settled to 0x00. 84 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66...

  • Page 85: Direct Communication With The Gps Receiver

    F9 and make it big. The messages needed by the iSync for stationary timing are highlighted. With the help of the U-Blox documentation, it is now possible to cancel messages, make other messages active or fully change the LEA-xT configuration. Important note: orolia.com GNSSource-1000 Manual | 85 sales@orolia.com Orolia Switzerland +41.32.732.16.66...
  • Page 86 GPS just as a "PPSREF generator" and to configure the iSync accordingly, see the Chapter: Tracking an external PPSREF To break the direct link to the GPS, run the iSync Manager, window "Terminal" and send "@@@@". 86 | GNSSource-1000 Manual orolia.com Orolia Switzerland +41.32.732.16.66 sales@orolia.com...

  • Page 87: Testing The Gps Jamming

    3) The "CW Jamming Indicator" is always under 4% in a not jamming situation. Values up to 10% are acceptable as long the "Jamming Status" is staying "Green, OK". - End of document - orolia.com GNSSource-1000 Manual | 87 sales@orolia.com Orolia Switzerland +41.32.732.16.66...

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