[time-nuts] GPS antenna length correction

Hal Murray hmurray at megapathdsl.net
Mon Apr 28 11:20:11 EDT 2014

brian at lloyd.com said:
> As I think about the geometry of satellite position and path length, it
> seems to me that, since the geometry is determined by the antenna position
> and not the receiver position, additional antenna cable introduces a fixed
> delay value and hence a fixed constant that gets added to each path
> regardless of direction. It seems to me that this would produce a much
> "fuzzier" solution to position and/or variation in timing. Knowing cable
> length and propagation velocity, would allow the software to subtract that
> constant from all ranges and thus provide a more correct position and time
> solution. Is this not the case? Does it do something simpler but "good
> enough"? 

If you just do the normal calculations, you get the location of the antenna 
as though you were there a while ago.  If you know the delay in the cable, 
you can correct the time.  There is no way to correct the position.

These are my opinions.  I hate spam.

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