[time-nuts] Precise positions for GPSDOs

Poul-Henning Kamp phk at phk.freebsd.dk
Thu May 2 08:22:25 EDT 2013

In message <CAPXiX5ricf=Ea0B=C2yR8iX+70SRtfJ9jeuTkgUQEhh5iZbN1A at mail.gmail.com>, Stewart Cobb writes:

>The next best idea is to locate your antenna on Google Maps. [...]

If your GPSDO's self-survey isn't better than the registration of
Google Maps, you have different problems.

In particular, be aware that the GPSDO does not need to know the
antennas _actual_ position, it needs the _apperant_ position, which
takes the reflection environment into account. (GW: "fresnel zone")

This is a much better strategy:


Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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