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Repeated tpv values


From: Marcin Bułka
Subject: Repeated tpv values
Date: Fri, 8 Oct 2021 09:34:19 +0200

Hi all,

I'm using gpsd 3.23.1 and I saw that I have most values repeated in different tpv objects. For example I have tpv objects with values like this:

timestamp: 1633008508200, eps: 0.16, lat: 45.11, lon: -0.85
timestamp: 1633008508200, eps: 86,    lat: 45.11, lon: -0.85
timestamp: 1633008508300, eps: 0.16, lat: 45.12, lon: -0.86
timestamp: 1633008508400, eps: 0.16, lat: 45.13, lon: -0.87
timestamp: 1633008508400, eps: 180,  lat: 45.13, lon: -0.87

So in most cases (not always) for given tpv object there is another tpv object with all values the same except for eps (one is always small like 0.15 and second is much bigger like 80). Is this normal? And how should I interpret it, which eps value is correct for given timestamp and localization?

In a previous version 3.20 I had similar problem but for the same timestamps I didn't have different eps but localizations, for example:

timestamp: 1633008508200, eps: 0.16, lat: 45.11, lon: -0.85
timestamp: 1633008508200, eps: 0.16, lat: 45.12, lon: -0.86
timestamp: 1633008508300, eps: 0.15, lat: 45.12, lon: -0.86
timestamp: 1633008508300, eps: 0.15, lat: 45.13, lon: -0.87

And here I don't know which localization is correct for a given timestamp.

Thanks,
Marcin




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