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Re: Identifying a GEO GNSS Satellite

From: Sanjeev Gupta
Subject: Re: Identifying a GEO GNSS Satellite
Date: Wed, 28 Apr 2021 12:47:12 +0800

On Wed, Apr 28, 2021 at 12:23 PM Gary E. Miller <> wrote:
Yo Sanjeev!

> Please see:

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):

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?


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