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[gpsd-dev] PPS over USB
From: |
Hal Murray |
Subject: |
[gpsd-dev] PPS over USB |
Date: |
Mon, 23 May 2016 01:16:16 -0700 |
address@hidden said:
>> PPS over USB will be more accurate with a fudge factor.
> Gack, no. The USB delay is much less than the sample interval on the USB
> 1.1 bus.
I don't understand what you are trying to say.
PPS over USB will be off on average of 1/2 the polling interval. It's easy
to see if you have a decent place to stand. In some sense, it's not a big
deal. On the other, it's a systematic error so it's silly not to document
the fix, especially in a document that is mostly cut-n-paste.
Eric: Please plug your 701W into your Pi with HAT and collect some data.
--
These are my opinions. I hate spam.
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