On Wed, Apr 28, 2021 at 12:23 PM Gary E. Miller <
gem@rellim.com> wrote:
Yo Sanjeev!
> Please see: https://ntpmon.dcs1.biz/
odd PRN 45 is on the sky view, but not in the sat list?
It is, identified as SB132
> I am at 1N, 103E. The PRN45 is a few degrees West of me, as I see
> it. It seems to be Geostationary.
The NMEA PRN range 32 to 64 is reserved for SBAS.
Fro mdrivers_driver_nmea.0183.c:
* 33..64: Various SBAS systems (EGNOS, WAAS, SDCM, GAGAN, MSAS)
Sadly, different GNSS receivers encode to PRN differently...
I'm going to guess it is NAVIC.
This shows the native PRNs (1-32):
https://en.wikipedia.org/wiki/Indian_Regional_Navigation_Satellite_System#List_of_satellites
IRNSS-1G, PRIN I01 is at 129.5 E. Maybe that one? If you can capture u-blox
binary, then we can see the PRNs.
But 129.5E is *East* of me. This is to the west.
I have a ublox (8,I think) at home. Will capture logs.
> It could be a BDS2 GEO, there is one (3I-2S) listed at 89.5E. But my
> receiver is not BDS-capable (MTK-3301 in NMEA mode). Would it see a
> BDS SBAS, because the protocol is similar to, eg, WAAS?
I think all SBAS speak an privately documented GPS dialect. All GNSS
protocols are open, except for SBAS.
Ah. If I understand you correctly, it is possible that my (putative) receiver understands WAAS and not EGNOS?
Thank you, will try a ublox capture today. gpspipe?
--
Sanjeev