Jackson Labs RSR GNSS Transcoder, User Manual

Page: 68 / 128

RSR GNSS Transcoder™ User Manual
58 © 2017 Jackson Labs Technologies, Inc.
The format of this command is:
SIMulation:LNAV:IONosphere <subframe> <word> <data>
The following describes the parameters accepted by SIM:LNAV:IONosphere:
<subframe> The GPS LNAV subframe number to be addressed by the command. Subframe
numbers range from 1 to 5, inclusive, corresponding to the subframes described in
IS-GPS-200H Appendix II ("GPS NAVIGATION DATA STRUCTURE FOR LNAV
DATA"). Currently the only supported subframe number is 4.
<word> The starting word position within the subframe at which the <data> will be written.
Supported word positions range from 2 through 9 inclusive, based on an initial index of zero.
<data> A series of consecutive 24-bit hexadecimal values to be written to the subframe
beginning at the specified <word>. Each 24-bit value consists of six ASCII hex characters
(nibbles). No spaces or other characters should appear anywhere within the <data> string.
Up to eight 24-bit values may be specified as long as the final <word> position does not
exceed the maximum index (9).
An example of this command is:
SIM:LNAV:ION 4 2 780502FFFF2603FFFB000003000000034EA8120000000000
4.3.48 SIMulation:LNAV:EPHemeris
The SIM:LNAV:EPHemeris command supports the transmission of user-specified ephemeris
parameters to the simulator for storage in nonvolatile memory. This command is normally only used
by the JLT Windows application available in late 2017.
The format of this command is
SIMulation:LNAV:EPHemeris <prn> <subframe> <word> <data>
The following describes the parameters accepted by SIM:LNAV:ION:
<prn> The destination satellite identified by its PRN number (1-32 inclusive).
<subframe> The GPS LNAV subframe number to be addressed by the command. Subframe
numbers range from 1 to 5, inclusive, corresponding to the subframes described in
IS-GPS-200H Appendix II ("GPS NAVIGATION DATA STRUCTURE FOR LNAV
DATA"). Supported subframes range from 1 to 3 inclusive.
<word> The starting word position within the subframe at which the <data> will be written.
Supported word positions for subframes 2 and 3 range from 2 through 9 inclusive, based on
an initial index of zero. Supported word positions for subframe 1 are 2, 6, 7, 8, and 9.
<data> A series of consecutive 24-bit hexadecimal values to be written to the subframe
beginning at the specified <word>. Each 24-bit value consists of six ASCII hex characters
(nibbles). No spaces or other characters should appear anywhere within the <data> string.
Up to eight 24-bit values may be specified as long as the final <word> position does not
exceSed the maximum index (9).
Data written by SIM:LNAV:EPHemeris is stored in a temporary RAM buffer on the simulator
platform. Once a complete set of ephemerides have been transmitted to the simulator, they must be
committed to EEPROM storage by issuing a SIM:LNAV:WRITE command.
An example of this command is: