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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 <> wrote:

> Please see:

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):

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.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703  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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