[Alberg30] GPS Question

[SandersM at aol.com]

In a message dated 9/12/02 2:40:47 PM, BlueDolphin at rivnet.net writes:

>Interesting, that might account for a 'fixed' difference between the two
>units, but not for a fluctuating difference between them.  At times they
>were the same, and then they would each drift, sometimes same direction
>sometimes opposite.  Once, they were some 50 feet apart!

I'm not an engineer, but my guess is that the differences are attributable to 
differences in operation.  There may be differences, for example, in the 
circuitry of the two units -- each is taking signals from several satellites, 
computing the apparent directions of each and triangulating the data to 
arrive at your position.  If the cicuitry is different, or the algorithms in 
the sofware are different, then the models might give differing results.

Even if the two units are identical, I would imagine that the performance 
might not be.  Each unit must acquire a signal from each satellite as it 
appears overhead, track each, and release each signal as it recedes.  Even 
with identical units, mounted next to each other, the manner in which each 
locks onto, receives and releases each of the signals, probably has some 
effect on the output.

As I said, I'm not an engineer -- just my guesses.

Sanders McNew.
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