Re: gpsd_json(5) and cgps seem to differ

[Bryan Christianson]

Hi Gary and Greg
In the gpsd_json manpage the description for PRN is 'PRN ID of the satellite. 
1-63 are GNSS satellites, 64-96 are GLONASS satellites, 100-164 are SBAS 
satellites'

> On 10/06/2023, at 7:07 AM, Gary E. Miller <gem@rellim.com> wrote:
> 
> On Fri, 9 Jun 2023 16:07:46 +1200
> Bryan Christianson <bryan@whatroute.net> wrote:
> 
>> I have noticed that values I am seeing in the S and PRN columns of
>> cgps seem to be at odds with the descriptions of the SKY/satellite
>> fields 'svid' and 'PRN' as reported at gpsd_json(5)
>> https://gpsd.gitlab.io/gpsd/gpsd_json.html. 
> 
> Care to be more specific about what you think is off?


The cgps output I posted has:

│ Time offset             0.119176000     s ││SB122    35  28.0  57.0   0.0  N │
│ Grid Square             RFxxifyy          ││SB129    42  34.0 310.0   0.0  N │
│ ECEF X, VX   -5092288.190  m    0.300  m/s││SB134    47  47.0   5.0   0.0  N │

I expected the PRN for SB satellites to be in the range 100-164

It's a discrepancy between gpsd and the documentation. I'm not sure which is 
correct.

Bryan Christianson
bryan@whatroute.net