Firmware Update Release Notes: GNSS Simulation
GSG-5 and GSG-6 Series Version 6.7.5 Release Notes
Rochester NY, USA
February 14, 2017
Version 6.7.5 – February 14, 2017
Features include:
 Execution log now contains the board and channel mapping of each signal generated during a scenario
 Introduced new log for subframe information
 Updated default NTP to UTC offset value to 18
 Galileo generation improvements
o Added possibility to specify Galileo almanacs
o Fixed IODa in subframe data
o Improved generation of almanacs from ephemerides - The almanac is generated from the ephemeris
having time of clock closest to the time of almanac
o SVID is set to zero in subframe data, if the corresponding SV is not included in the constellation
o Fixed iono parameters in subframes
o Fixed satellite health parameters in subframes
Fixes include:
 Corrected the times in the data logs so they are all aligned
 Fixed a lockup condition that could occur when NTP time is selected and scenario start is cancelled
 Fixed infrequent packet loss problem causing TCP retransmissions
 Improved USB operation that caused errors when files were transferred
Version 6.7.3 – November 15, 2016
Fixes include:
 Corrections to GSG-5 licensing
Version 6.7.2 – November 11, 2016
Fixes include:
 Corrections to GSG-61 signal generator operation
Version 6.7.1 – November 2, 2016
Features include:
 New Troposphere model – DO-229
 Support for TLE file format
 Added new parameter to prn and channel power events to keep noise setting the same when power is adjusted
 Implemented advanced log feature with support for RSG and satellite data
 All RSG queries are available without RSG license
 GSG-61 model introduced
 Added display of imperial values and UTC time to the front panel display while scenario is running
 Spaces are allowed around commas used as delimiters in SCPI arguments
 Multiline responses for raw SCPI mode now always contain newline symbol after the last line
 New scenario parameter allows the user to set all power offsets between constellations to zero
Fixes include:
1 | GSG Firmware Release Notes
Corrected application of SBAS NAVBITS events
Improved performance of SBAS corrections
Fixed a bug that caused a unit crash when downloading observation files
Signal generator corrected to generate multiple constellations simultaneously
SOURce:SCENario:DATEtime SCPI command can be used to set the time to NTP
Fixed the ability to set the date/time and position while scenario is not running
Corrected RINEX observation file generation for QZSS
Updated list of supported SBAS satellites
Implemented a workaround for the GSG dropping from the network
Improved web interface to prevent it from becoming inaccessible
Fixed a bug that caused SCPI requests to time out
Removed unnecessary newline symbols in NMEA log
Version 6.6.5 – June 7, 2016
Fixes include:
 Corrected event file usage in looping scenarios
Version 6.6.3 – May 8, 2016
Fixes include:
 Fixed a bug that prevented calibration verification in manufacturing
Version 6.6.1 – April 22, 2016
Features include:
 NMEA handling is redesigned. Interpolation is done internally; external interpolation of the trajectory is no
longer a requirement.
 Increased precision of lever arm and ECEF coordinate entries
 Subframes are now synchronized across all GPS satellites. All GPS satellites transmit the same subframe/page at
the same time.
 Introduced OPT-TLM allowing the TLM word to be set to all 1’s in the unit, applied to all simulations
 Introduced OPT-HPWR to allow the maximum power available from the GSG to increase to -50dBm
 Environment propagation models can be selected from the front panel
 Return Link Service testing for Galileo is supported
 RSG file trajectories can be looped within a scenario
 New SCPI command for rebooting the unit remotely
Fixes include:
 Corrected a bug that caused that GLONASS 4 year interval number to be incorrect after rollover
 Update of start time from NTP is now correct when stopping a scenario and immediately restarting it
Version 6.5.3 – December 21, 2015
Features include:
 QZSS and GPS ephemeris and almanac files can now be downloaded from the JAXA server
Fixes include:
 Fixed a problem that caused GLONASS only scenarios to have the wrong date
 Corrected a bug that could cause ephemeris download to fail
Version 6.5.1 – September 14, 2015
Features include:
2 | GSG Firmware Release Notes
 New environmental propagation models: Urban, Suburban, Rural
 SCPI command added for changing signal generator mode
 Added support for RINEX v2.12 file types
 ANTEX files are accepted to support PPP testing
Fixes include:
 Noise BW properly set in GSG-55 licensed units
 NMEA correctly outputs speed over ground
 Fixed a bug that caused signal generator to lock up when SBAS signal type was selected
 Adding SBAS in a scenario will correctly generate only 1 of each satellite
Version 6.4.3 – July 13, 2015
Features include:
 Separate fields for NTP server address and data download server address
 New signal generator mode – PRN code modulation ON, data modulation OFF
 Default data and NTP offset are updated to reflect the current GPS-UTC offset – now 17
 The GN talker ID for RMC and GGA NMEA sentences is now accepted for trajectory files
Fixes include:
 Correct power level set when commanded via SCPI
 Corrected GLONASS almanac time when user navigation files are used
Version 6.4.1 – May 27, 2015
Features include:
 Support for IRNSS L5 constellation generation (OPT-IRN)
 Support for QZSS L2C and L5 (OPT-QZ, OPT-L2C, OPT-L5)
 Trajectories can now be defined using 6 Keplerian elements
 Added YUMA Almanac support for QZSS
 Default constellation updated to support newly launched block IIF satellite
 Improved calculations when only position information is given as trajectory
 Added SCPI commands to support closed circle trajectories
o TURNRATE – similar to RATEHEADING command, but the given rate will be used as an average heading
around full circle, and heading will be changed each step in order to maintain a closed circle
o TURNRADIUS – specifies value of circle radius in meters
 Added SCPI command to query SV position
o SVPos? – query a satellite’s ECEF position
 Added SCPI commands to query pseudo-range and Doppler of each satellite
o DOPPler? – query a satellite’s Doppler
o PRANge? – query a satellite’s pseudo-range for a frequency band
 Added confirmation when stopping a running scenario
 Default RINEX data is now available to user from StudioView File Manager or web interface files
 User can now specify the sequence of CNAV messages
Fixes include:
 Fixed a bug that could cause a crash if the user trajectories directory is empty
 Improved Simulate Now satellite generation through UTC day rollover
 Improved L2C and L5 CNAV message update
 Heading on front panel shows correct value even when speed is very small
 Fixed BeiDou GEO satellites’ residuals jump
 Changed web server to eliminate issues with the web UI locking up
 Fixed a bug that caused the simulator to disable satellites when it should not
3 | GSG Firmware Release Notes
Version 6.3.5 – April 13, 2015
Features include:
 Support for new GSG hardware revisions
Fixes include:
 Corrected BeiDou day numbering for BeiDou-only leap second testing
 Corrected how GLONASS ephemeris is transmitted during GLONASS-only leap second
 Fixed an issue that caused a unit lockup when a BeiDou scenario is running for more than 20 hours.
Version 6.3.1 – February 28, 2015
Features include:
 GSG Front Panel Menu has been redesigned. All items are still available/settable from the front panel, but the
menu arrangement has changed. The basic scenario parameters are more accessible and the advanced features
are now submenus.
 SP3 format now supported for defining constellation
 IRNSS L5 signal available in the signal generator (OPT-IRN)
 Future Leap Second value, week number, and day of week are read from RINEX 3 header file if given
 New SCPI command to check synchronization of time between GSG and NTP server
 Simulate Now can use files generated by SecureSync (instead of internet source)
 Added Navbits support for Galileo
 Updated RSG Engine to include more realistic movement model
 Improved NTP time synchronization
 New SCPI commands have been introduced to allow entry of PRY rates and attitude in degrees
 TLM value updated to reflect current value in the GPS signal
 Improved SCPI-raw performance
 Scenarios are now available for RTCM 11000.3 Marine testing
 TDG (timing group delay) set to a non-zero value
Fixes include:
 Corrected carrier phase observations for GPS L5
 Corrected RTCM messages to include initialization of carrier phase advance (due to ionosphere)
 Fixed an error that could cause Simulate Now to lose synchronization in scenario runs of greater than 1 day
 Corrected a bug that caused *OPC? to fail to block commands when issued in the first seconds of a scenario start
 Fixed an issue that caused HDOP value in NMEA sentences to be updated only when view 2 or higher was shown
on front panel during running scenario.
 Fixed a bug that set max power level at -67.3dBm instead of -65dBm
- NOTE: Requires min v2.04 to be installed first
Version 6.2.7 – January 22, 2015
Limited Release
Features include:
 Removed auto start confirmation pop-up from GSG-51
Version 6.2.5 – December 1, 2014
Limited Release
Features include:
4 | GSG Firmware Release Notes
Added Navbits support for BDS and SBAS signals
QZSS L1-SAIF signal introduced (OPT-QZ)
Version 6.2.1 – October 31, 2014
Features include:
 Support for QZSS L1C/A (OPT-QZ)
 Support for GEO and IGSO BeiDou satellites (OPT-BDS)
 Support for Beidou B2 (OPT-BDS, OPT-L5)
 Support for Vehicle Silhouetting to block signals based on vehicle body (OPT-VIS)
 Support for Lever Arm (OPT-VIS)
 Multipath parameters can now be modified during runtime using SCPI commands or event files
 Pressing the ‘Menu’ button when the scenario is running displays the running scenario configuration
 STANAG tropospheric model is available
 IONEX files are accepted for custom Ionosphere models
 Navigation message modification can be done using event files
 Altitude is also displayed as Mean Sea Level on front panel and in NMEA log
 L5 band is supported by the ionosphere model
 RINEX Observations include phase data
Fixes include:
 Corrected multipath doppler offset implementation
 Corrected normalized sensor range
 Fixed a bug that caused linearaccelerometer to give the wrong direction
 Improved scenario startup time
 Starting altitude is handled correctly when using NMEA files
 Corrected PRYrate command so the orientation does not suddenly change when crossing 180degrees
- NOTE: Requires min v2.04 to be installed first
Version 6.1.1 – July 18, 2014
Features include:
 Support for Jamming simulation (OPT-JAM)
o Added noise and sweep types of interference
o Added location based jammer
 Support for sensor simulation (OPT-SEN)
o Accelerometer
o Linear Accelerometer
o Gravimeter
o Gyroscope
o Odometer
o Odometer3D
 Support for environmental models to block signals (OPT-VIS)
 Timing calibration file is accessible to the user if OPT-TIM is installed
 Run-time control of noise and unit power level from front panel
 Added capability to change navigation message bits to simulate errors
 YUMA almanac is accepted
 SCPI improvements
o SatID can be given as an input for SOURce:SCENario:POWer
o Added command for retrieving MAC address via SCPI
 Added possibility to add a random offset to multipath carrier phase at startup
5 | GSG Firmware Release Notes
 Option E6 has been renamed to L6 to support BeiDou B3 when available
 MAC address is now shown in the network settings menu
 Part number is displayed on the show system information screen
 Added ability to upload files to unit via web interface
 Signal Generator settings persist through a power cycle
Fixes include:
 When Observation logging is turned on, it is only for one scenario
 Fixed web interface presentation and operation in Internet Explorer
 RTCM messages are no longer available when a base station location is not set
 Fixed a bug that caused unit transmit power to change when a high power level interference signal was set
 Event files are limited to 4000 lines
 Improved SCPI-RAW over Telnet
 Fixed a bug that caused unsaved parameter changes to show in the scenario overview
- NOTE: Requires min v2.04 to be installed first
Version 6.0.4 – May 5, 2014
Fixes include:
 Fixed a bug that could cause unit to lock up when loading/starting/stopping scenarios
 Corrected Interference channel issue that could lead to all interference channels defaulting to GPS L1 C/A
 Corrected phi orientation in user antenna files
o Phi is now anti-clockwise with phi 0 degrees pointing to the north
- NOTE: Requires min v2.04 to be installed first
Version 6.0.3 – April 17, 2014
Features include:
 SCPI-RAW allows sending of SCPI commands via Ethernet without using VISA or VXI-11
 New SCPI command allows user to disable altitude compensation
 RTCM 3.x message support for GLONASS
 Position can be set using the RSG SCPI commands when a scenario is loaded but not yet running
Fixes include:
 2 SCPI commands updated for better performance
o SOURce:POWer
o SOURce:SCENario:DATEtime?
 Corrected minor coordinate format issue
 Corrected power levels with antenna pattern files
 Heading and RateHeading commands do not reset acceleration to zero
- NOTE: Requires min v2.04 to be installed first
Version 6.0.1 – March 13, 2014
Features include:
 BeiDou B1 (opt-BDS) capable
 RTCM 3.x message output capable (opt-RTK)
 Memory optimized to allow 4 constellations to be generated simultaneously
 Unit files can now be accessed via http (Web interface)
 RINEX Navigation files can be logged on the unit during a scenario run
 YUMA almanac is now generated automatically when a scenario is run
 Added the ability to independently control power levels for L1, L2, and L5
6 | GSG Firmware Release Notes
Protocol enhancements
o Added command to enable Galileo E5 in signal generator mode
o Added commands to control power levels by frequency from protocol
Fixes include:
 GPS signals used as interference or in Signal Generator are no longer lost at the week rollover
 Corrected gains in antenna model GPS-703-GGG
 Corrected vertical acceleration RSG commands
 Corrected a geometry issue that affected position when traveling a large distance from scenario start position
 Abspower off event corrected
 GLONASS leap second is properly handled
 Protocol fixes
o SOURce:PPSOUTput no longer requires full command text, shortened SCPI command is accepted
o Datetime second format corrected
- NOTE: Requires min v2.04 to be installed first
Version 5.5.7 – December 20, 2013
Features include:
 Improved Simulate Now reliability
 Improved external triggering
Fixes include:
 Correct power level offsets that were not applied to different frequencies, codes, and constellations.
 Corrected L2C and L2P signal levels
 Corrected L2P(Y) signals
 Corrected 180 degree longitude entry
 Corrected GLONASS signal disappearing in signal generator mode after 2-5 hours.
 Corrected the PPS offset value in units with an older hardware configuration
- NOTE: Requires min v2.04 to be installed first
Version 5.5.5 – November 11, 2013
Features include:
 Improved observation files
o Different files names for each observation file
o More than one hour of observations data can be collected
 Support for record and playback to replay data recorded data the same day
 Galileo E5 capable
Fixes include:
 Galileo E1/E5 ranges corrected
 Corrected an issue that could cause the unit to lock up at a certain day and time of week
Known Issue:
 Power level offsets are not applied to different frequencies, codes, and constellations.
- NOTE: Requires min v2.04 to be installed first
Version 5.5.4 – October 25, 2013
Features include:
 Improved PPS timing calibration, allows special calibration option
 Aligned the NMEA log data to the whole second
 Improved response when querying unused channels
Fixes include:
7 | GSG Firmware Release Notes
 SBAS corrections applied to the satellite ranges
 Corrected SCPI commands for power adjustment when used with RSG option and without
 Corrected a bug that prevented a custom antenna gain pattern from taking effect unless ‘enter’ was pressed
 Corrected the number of digits in NMEA data timestamps
 Corrected transfer of binary files using SCPI
 SBAS satellite position correction
- NOTE: Requires min v2.04 to be installed first
Version 5.5.1 – July 8, 2013
Features include:
 Simulate ‘Now’ capable
 Galileo E1 capable
 Improved trajectory altitude handling
 Observations now support multiple frequency bands
 SV clock models implemented
 Added ability to load user selected SBAS files
- NOTE: Requires min v2.04 to be installed first
Version 5.1.13 – May 23, 2013
Fixes include:
 Corrected L2 power level issue.
- NOTE: Requires min v2.04 to be installed first
Version 5.1.11 – May 6, 2013
Fixes include:
 Patch to Linux kernel to address new USB part now being used.
- NOTE: Requires min v2.04 to be installed first
Version 5.1.9 – May 6, 2013
Fixes include:
 Corrected network bug that could cause unit to randomly drop from network
 Improved RSG synchronization with OPC
 Fixed an error that could cause satellites to be disabled due to a phase shift between P-code and C/A code
- NOTE: Requires min v2.04 to be installed first
Version 5.1.7 – April 30, 2013
Features include:
 Improved external trigger feature - only first trigger received is used
 Introduces single channel GSG-5 unit
Fixes include:
 'Speed or altitude above regulation limits' error that can occur during a static scenario
 Improved synchronization for GSG-63/64 models
 Corrected GLONASS ranges
- NOTE: Requires min v2.04 to be installed first
Version 5.1.5 – April 10, 2013
Fixes include:
 Fixes GPIB bug that affects log? command
- NOTE: Requires min v2.04 to be installed first
8 | GSG Firmware Release Notes
Version 5.1.3 – April 02, 2013
Fixes include:
 Removes an error message that may show in GSG-5 licensed units
- NOTE: Requires min v2.04 to be installed first
Version 5.1.1 – March 18, 2013
Features include:
 Controlled TOA for Age of Almanac reporting by some receivers
 Default data leap second updated to 16
- NOTE: Requires min v2.04 to be installed first
Version 5.0.1 – February 22, 2013
Features include:
 Capability for new GPS signals L2c and L5
 Adds the ability to choose the satellite model for each GPS and GLONASS satellite
 Calibration date is stored in unit
 Improved options display – see which options are enabled and which are not in each unit
 Signal generator can output 1 each of GPS and GLONASS
 Adds the capability to add trial licenses for software options
Fixes include:
 Corrected error when antenna model is used with attitude changes
 Corrected the ephemeris data file calculation in signal generator mode
 Added fix for Garmin that would not use the signal if there was 0 clock error
 Improved the fan speed settings
 Improved NMEA file size and handling (improvement from 4.5/4.51)
- NOTE: Requires min v2.04 to be installed first
Version 4.51 – December 20, 2012
Fixes include:
 SBAS bug fix in v4.5 that would cause SBAS satellites to be disabled when the scenario is started.
- NOTE: Requires min v2.04 to be installed first
Version 4.5 - December 19, 2012
Features include:
 Capability for Real-time scenario generation feature
 Introduces new trajectory format, .traj files
 Repeatable trajectory capability
 Programmable PPS (configurable to 1, 10, 100, 1000 PPS)
 Reset (&Clean) factory defaults using SCPI protocol
Fixes include:
 Faster response to SOUR:SCEN:LOG? command
- NOTE: Requires min v2.04 to be installed first
Version 4.11 - October 23, 2012
Fixes include:
 Improved USB functionality
Version 4.09 - October 18, 2012
Features include:
9 | GSG Firmware Release Notes
 Change in signal generator mode to use af0 and af1 value from the RINEX ephemeris file.
 Execution log introduced on unit.
- NOTE: Requires min v2.04 to be installed first
Version 4.07 - September 28, 2012
Corrections include:
 L1L2-Iono model correction
 Signal duplication using events now works properly
 Multi-band antenna gain fixes
 Unit detects loss of external reference and reports error
- NOTE: Requires min v2.04 to be installed first
Version 4.05 – August 18, 2012
- Includes workaround for Topcon GRS-1 issue
Corrections Include:
 Corrected a bug that can cause a ‘Speed or altitude above regulation limits’ error to occur in a static scenario
 Corrected a bug that caused interference signals to have -65dbm power level regardless of requested value
 Ensured all interference signals are shown in the scenario details when running
 Fixed an issue with GLONASS only scenarios where the next day’s data did not load on long scenarios
- NOTE: Requires min v2.04 to be installed first
Version 4.01 – August 6, 2012
- Introduces GSG-62.
- Introduces GPS P/Pseudo-Y.
- Introduces GPS L2 and GLONASS L2.
Features include:
 Added ability to set scenario start time from an NTP server
 NMEA log data from unit contains more accurate SNR values
 Introduced user defined antenna patterns
 Arming and Triggering can now be done from the front panel
 The front panel keys can be locked out
 Introduced Scenario Relative power event
Corrections include:
 GLONASS RINEX file fixes
 Corrected a bug that would cause a crash if a scenario was started with zero satellites selected
 Corrected a bug that could occur in the transmit power menu after a factory reset
 Improved error message received when unit exceeds regulation limits
 Updated satellite identifiers returned by SOURce:SCENario:SATid[n]?
 GPIB setting now persists through a power cycle
 Updated 3GPP trajectory to correct for a jump sometimes seen when the trajectory repeats
 Calibration mode now outputs full power with zero attenuation
 Corrected an almanac issue that caused certain receivers to hang when reading almanac data for unhealthy sats
- NOTE: Requires min v2.04 to be installed first
Version 3.03 – April 30, 2012
-Allows for creation of GSG-53 GPS/GLONASS 4-channel simulator
Corrections include:
 GLONASS almanac fixes
10 | GSG Firmware Release Notes
New coordinate formats on front panel display. Pressing the format button now changes between:
1) Geodetics in DD MM.mmmm (current format)
2) Geodetics in DD MM
3) Geodetics in DD ddddd
4) EFEC in IIIIIII.ii (signed Integers)
 Antenna model fixes:
o Fixed issue with signal levels growing over time when using patch antenna model
o Corrected a minor issue in the cardioid antenna model algorithm
 Fixes to interference channels:
o Changed the display of the interference channel to indicate whether it is a GPS or GLONASS CW signal
o Correct an error that could cause the wrong frequency to be transmitted when selecting GLONASS slot 0
 Improvements to firmware update:
o Update can be canceled while the file is being transferred but not once update has started
o Firmware will check for free space and firmware file in the user partition temporarily as necessary
 SCPI protocol fixes:
o Added proper wait time for SOURce:ONECHN:CONTrol stop command
o Corrected GGA format from NMEA log query- removed extra field
o Changed Elevation and Azimuth fields in GSV sentences to integers
 Other fixes:
o Disabled the ability to create a multipath SBAS signal via an event file
o Added an acknowledgement screen after reset to factory defaults is complete
- NOTE: Requires min v2.04 to be installed first
Version 3.02 – March 13, 2012
 Correction: Unit locks up on next reboot after manual calibration using calibration menu.
- NOTE: Requires min v2.04 to be installed first
Version 3.01 - February 29, 2012
 Corrections to the v3.00 release
- NOTE: Requires min v2.04 to be installed first
Version 3.00 - February 22, 2012
- GSG-56 introduced GLONASS support
New features include:
 RINEX Observation file logging,
 10Hz NMEA trajectory support
 ECEF coordinate support
 Interference signals (GSG-55/56)
Bug fixes include:
 Time jump at day26
 USB improvements
- NOTE: Requires min v2.04 to be installed first
Version 2.09 – October 12, 2011
 Configurable gateway
 Configurable DNS
 HTTP proxy support to be used with download feature
 Because of above changes the "Interface and reference" menu has been reorganized
 Fix for "Garbage on the screen when scen/siggen is run/stopped many times from protocol"
- NOTE: Requires min v2.04 to be installed first
11 | GSG Firmware Release Notes
Version 2.08 - September 29, 2011
 Limits for Export restricted version changed to be greater than before
 Fix for "Every Thursday in 2011 (except a few in Jan2009) cause error"
- NOTE: Requires min v2.04 to be installed first
Version 2.07 - August 26, 2011
 External trigger can be used to synchronize several units
 Improved almanac handling
 Faster scenario start-up
 Web interface improvements
 Ublox and Trimble Force 22E receiver performance verified
 GSG-55E model name introduced
 A number of scenario replay and usability enhancements
- NOTE: Requires min v2.04 to be installed first
Version 2.06 – May 31, 2011
 Correcting for FPGA M9K Memory Block Read Issue, which caused severe problems for affected HW units
 Introducing Reset&Clean functionality
 Introducing Configurable gateway
 Introducing Export restricted version
 Introducing Dynamic navigation message updating and better leap second handling
 Usability improvements, e.g. Yes/No/Cancel dialogs and better error handling when parsing user uploaded
scenario files
 Avoiding 'no ext ref' warning message, by giving the PLL extra time to lock. Esp needed by the 622 VCXO version.
- NOTE: Requires min v2.04 to be installed first
Version 2.05 - April 25, 2011
 Web interface reboot disabled during firmware update
 Front panel changes according the license
- NOTE: Requires v2.04 to be installed first
Version 2.04 - April 11, 2011
 Support for Web interface, unit front panel as a Web page.
- NOTE: Requires v2.03 to be installed first
Version 2.03 - April 6, 2011
 Support for configurable VCXO frequency
 First part for enabling web server interface
Version 2.02 – March 10, 2011
 Leap second feature added
 NMEA trajectory corrections with improved support data with only one of the GGA, RMC types present
 Changes in navigation message to correct for an issue seen with Rockwell receivers
 Protocol improvements, IEEE488.2 commands
 Corrected issue with verifying calibration data
 Corrected missing SBAS data behavior
12 | GSG Firmware Release Notes
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