On 12/29/12 6:34 PM, Bob Camp wrote:
Hi
The gotcha is that often the "navigation" and "timing" receivers are identical
in terms of hardware. There is no upgraded hardware in the timing device.
When you put a receiver into position hold, you are telling it "I don't care about
the location solution". It reduces the weight of that part of the filter. Yes,
that's only one way to look at it and there are other ways to look at it.
or, another conceptual model is: I'm fixed, I know where the
transmitting satellite is, and can calculate range and doppler a priori,
so anything else must be local clock variation and propagation. And you
can average out the propagation among multiple satellites (or use one
satellite as your timing reference)..
Particularly if you are post processing and have precise ephemeris data
for the satellites....
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