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Re: Satellites show up multiple times

From: Gary E. Miller
Subject: Re: Satellites show up multiple times
Date: Tue, 4 Aug 2020 09:53:47 -0700

Yo Andreas!

On Tue, 4 Aug 2020 12:04:20 +0200
Andreas B <> wrote:

> I'm using a ublox ZED-F9P with default settings, which works great.

But, as you see, still a long way to go.

> Some satellites have two entries in the seen/used list in cgps.

That is a new "feature".  There are no duplicates, each is a separate
satellite and frequency (L1, L2, E5, etc.) combination.

Yes, the presentation needs a lot of work, patches welcome. cgps ran
out of screen space for new items a while ago.  Almost 200 signals can
be tracked by an F9P, how to display all that?  Some new concepts are

If you look at the JSON the data is presented more unambiguously.

> The SNR difference between the two entries of
> PRN 7 is 11, which really seems to be alot. Why this big difference?

Each is a separate freqeuncy.  Each is being tracked by a different
channel in the receiver.  Depending on your antenna, the satellite, the
atmosphere, multipath, and more, it is normal that each has a different

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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