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Re: Identifying a GEO GNSS Satellite


From: Gary E. Miller
Subject: Re: Identifying a GEO GNSS Satellite
Date: Tue, 27 Apr 2021 21:23:07 -0700

Yo Sanjeev!

On Wed, 28 Apr 2021 11:32:11 +0800
Sanjeev Gupta <ghane0@gmail.com> wrote:

> Please see: https://ntpmon.dcs1.biz/

odd PRN 45 is on the sky view, but not in the sat list?


> 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.

> 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.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin

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