Configuring The Gps Constellation; Uploading Almanac And Ephemerides Data - Jackson Labs RSR GNSS Transcoder User Manual

RSR GNSS Transcoder™ User Manual
Combined Accelerate/Turn - Specify heading change, lateral acceleration and change in
speed.
Combination Acclerate/Turn/Climb - Specify change in heading, lateral acceleration, change
in height, height rate and start and end lateral acceleration
Halt - Set final position and stop
End - End sequence of motion commands

3.8.5 Configuring the GPS Constellation

The default GPS constellation for simulation and transcoding is a synthesized 30 satellite
constellation optimized for position and timing accuracy. In most cases, this synthesized
constellation should be used, however there are cases where a specific user-selected GPS
constellation needs to be simulated. In these cases, the user can provide the subframe data for either
the ephemeris or almanac for each satellite.
The SIMulation:LNAV:SELect <SYNTH | USER> command sets the source of the ephemeris and
ionospheric correction data. With the USER option, the stored ephemeris and ionospheric data from
the SIM:LNAV commands will be used directly in the simulation. Care must be taken so that the time
of validity for the ephemeris is within 0 to 2 hours after the simulation time. For simulations longer
than 2 hours the ephemeris data must be updated periodically and at least every two hours for the
target GPS receiver to operate correctly and with a continuous smooth PVT output.
As of the release of this manual the USER mode is not yet supported in the firmware. Future releases
of the RSR GNSS Transcoder™ firmware will included support for the USER mode and SIM:LNAV
commands. Also the Jackson Labs Technologies, Inc. Windows simulator application available end
of 2017 will provide the tools to convert standard RINEX ephemeris and Yuma almanac data to
subframe data that is accepted by the RSR GNSS Transcoder™.

3.8.5.1 Uploading Almanac and Ephemerides Data

To provide ephemeris data to be used during the simulation enter the following command:
SIMulation:LNAV:EPHemeris <prn> <subframe> <word> <data>
for up to 32 satellites PRN numbers. See Section
subframes and words for each PRN.
Similarly, ionospheric correction data is provided with the following command:
SIMulation:LNAV:IONosphere <subframe> <word> <data>
See Section 4.3.47
All of the required words in a subframe must be received together since the entire subframe is
assembled in volatile memory. To store the completed subframe in non-volatile memory for use in
the simulation enter the SIM:LNAV:WRITE command.
As of the release of this manual the USER mode and the SIM:LNAV commands are not yet
supported in the firmware. Future releases of the RSR GNSS Transcoder™ firmware will included
support for the USER mode and SIM:LNAV commands. Also the Jackson Labs Technologies, Inc.
Windows simulator application available end of 2017 will provide the tools to convert standard
RINEX ephemeris and Yuma almanac data to subframe data that is accepted by the RSR GNSS
Transcoder™.
30
for a complete description of this command.
4.3.48 for a complete description of the required
© 2017 Jackson Labs Technologies, Inc.