Lady Heather's precision (nominal 48 hour) survey collects data over multiple 1
hour periods. With 48 hours of data, multipath and transient disturbances are
minimized. It applies weighted median filters to the data and does other
statistical analysis to arrive at a final location. With a good choke-ring
antenna you can get within under a foot. With a crappy patch antenna without a
ground plane maybe 6 feet. Simple averaging of the survey samples does not
perform nearly as well.
As far as Lady Heather not working with other GPSDO's... well, She has good
taste. The Trimble Thunderbolt is far and away the best time-nut GPSDO out
there. It is highly configurable and controllable, comes with a very good
OCXO, and is dirt stinkin' cheap. If you dot all your i's and cross all your
t's and pay very close attention to the details you can coax ridiculously high
performance out of the tiny little box... rivaling the best cesium references
made for under $200.
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