Re: GPS Tip: Why does a GPS need to know where it is before it can compute where it is?

Happy Trails wrote:
On 24 Mar 2006 17:56:52 -0800, s_anode@xxxxxxxxxxx wrote:

The software assumes it knows where the receiver is located. Estimates
the error vectors from all the satellites assuming that postion (and
time). Weighted least sum squares those errors into a offset, adds
that offset to the assumed position (and time), and repeats until the
offset jump is negligible or the cycle has been repeated too many
times.


There, Sam - see what nonsense you have started!

If you are going post a "tip of the day", at least keep it on the same
subject line, so someone can just do an "ignore thread" on it.

Melanie


As soon as I quit laughing... I should regret that I made the
posting in the first place.....

But it may yet serve to be educational. OK--Here's a quiz...
Does everybody know the difference between ephemeris and
almanac data and the roles the play in GPS receivers? If
not, we may salvage this thread after all.



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