I see that Paragon-X allows the generation and capture of various ToD formats. What are these, and where can I find more information on the format of each?
Supported formats
Paragon-X is aware of the following formats:
- CCSA
- Cisco
- NTP
- NMEA (GPRMC and GPZDA)
- G.8271
References and details for each are given below.
...
| Value | Meaning | Decoded |
|---|---|---|
225446 | Time of fix | 22:54:46 UTC |
| A | Navigation receiver warning | A = OK, V = warning |
| 4916.45,N | Latitude | 49 deg. 16.45 min North |
| 12311.12,W | Longitude | 123 deg. 11.12 min West |
| 000.5 | Speed over ground, Knots | 0.5 |
| 054.7 | Course Made Good, True | |
| 191194 | Date of fix | 19 November 1994 |
| 020.3,E | Magnetic variation | 20.3 deg East |
| *68 | mandatory checksum |
...
| Mandatory checksum |
An example GPZDA message is $GPZDA,172809.456,12,07,1996,00,00*45, which decodes as
| Value | Meaning | Decoded |
|---|---|---|
| 172809.456 | UTC | 17:28:09.456 UTC |
| 12 | Day of month | 12th |
| 07 | Month | July |
| 1996 | Year | 1996 |
| 00 | Local time zone offset from GMT, ranging from 00 through ±13 hours | 0 hours offset from GMT |
| 00 | Local time zone offset from GMT, ranging from 00 through 59 minutes | 0 minutes offset from GMT |
| *45 | Mandatory checksum |
G.8271
This is defined in Clause A.1.3 of the ITU-T G.8271 standard. These are serial messages sent once per second, at 9600 baud (default), no parity check, within 1ms of the 1PPS rising edge, with content that represents the time at which the current 1PPS starts, and which finish within 500ms.
...
Detailed description of each of the three message types - event, announce and GNSS status - can be found in Clause A.1.3 of the G.8271 standard linked above.
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