[time-nuts] : L1 GPS timing signal(s) into local time on computer(s)
gxti at partiallystapled.com
Tue Aug 21 16:46:34 UTC 2012
On 08/21/2012 12:35 PM, Sarah White wrote:
> Thanks Chris.
> I always appreciate clear explanations. I'm assuming that the "fixed
> location" requirement is important to note for purposes of compensating
> for any dopler shift, as well as the distance the signal must first
> travel before being decoded.
> ... I would presume that the fixed location used for above calculations
> would be relative to the position of the antenna? I read somewhere that
> even compensating for the length of the antenna cabling is important?
Yes, the antenna location is what's being measured. You will want to
compensate for cable delay but this is simply a matter of subtracting
however many nanoseconds it takes the signal to flow through the cable.
It does not directly affect the process of doing fixes (whether for
position or for time) because the pulses from all of the satellites flow
in parallel once they're inside the cable.
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