SBAS1
PRN mask assignments
|
Platform: |
OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7, SMART2 |
The PRN mask is given in SBAS1. The transition of the PRN mask to a new one (which will be infrequent) is controlled with the 2-bit IODP, which sequences to a number between 0 and 3. The same IODP appears in the applicable SBAS2, SBAS3, SBAS4, SBAS5, SBAS7, SBAS24 and SBAS25 messages (SBAS32, SBAS33, SBAS34, SBAS35 and SBAS45). This transition would probably only occur when a new satellite is launched or when a satellite fails and is taken out of service permanently. A degraded satellite may be flagged as a “do not use” satellite temporarily.
Message ID: 977
Log type: Asynch
Recommended input:
log SBAS1a onchanged
ASCII example:
#SBAS1A,USB1,0,46.5,SATTIME,2209,514210.000,02000020,5955,16809;135,ffffffff0000000000000000000000002a40000000000000000000,2*193c8b8a
Each raw SBAS frame gives data for a specific frame decoder number. The SBAS1 message can be logged to view the data breakdown of SBAS frame 1 which contains information about the PRN mask assignment.
|
Field |
Field type |
Description |
Format |
Binary bytes |
Binary offset |
|
1 |
Log header |
SBAS1 header For information about log headers, see ASCII, Abbreviated ASCII or Binary. |
|
H |
0 |
|
2 |
prn |
Source PRN of message |
Ulong |
4 |
H |
|
3 |
mask |
PRN bit mask |
Uchar[27] |
28 1 |
H+4 |
|
4 |
iodp |
Issue of PRN mask data |
Ulong |
4 |
H+32 |
|
5 |
xxxx |
32-bit CRC (ASCII and Binary only) |
Ulong |
4 |
H+36 |
|
6 |
[CR][LF] |
Sentence terminator (ASCII only) |
- |
- |
- |