[Thumbgps-devel] [gpsd-dev] PPS over USB

[Hal Murray]

esr at thyrsus.com said:
> Clock time should be OK even with a single sat - multiple birds are needed
> for the spherical trig to compute position, but atomic time you get directly
> from each sat sample. 

I think it's more complicated than that.

You can get time with only 1 sat if know where you are located.  It takes 
special software, usually called "timing".

The usual approach for finding the location is to do a "survey".  That 
requires more special software which is usually included in the timing 
package.  It collects a 1000 (or whatever) good samples and averages the 
position.  The "good" qualifier means they don't use low-quality samples 
which might be way off.

It's worth asking Navisys if they have the timing mode software.


-- 
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