So I am wondering and without experimenting I hope someone can answer
something for me.

Suppose I use (lets say 3 or 4) identical USB 12 channel NEMA compatible
receivers, sit them side by side, and stream the data to a PC. Should
the units lock onto the same set of satellites, receive the exact same
time signals, have the same SNRs, and display the exact same position
information, or ...

would they all give slightly different positions so that averaging the
results be an effective method of getting more accurate positioning
information?

Intuitively I'd expect subtly different receiver characteristics,
potentially causing different satellite locks, differing SNRs, and
different position values between the units. I'd suspect that even
slight differences in the internal clock frequencies of the receivers
could make a difference.

Anyone knowledgeable have any thoughts on this?

On 16 Dic, 13:32, Rob <no...@all.com> wrote:
> So I am wondering and without experimenting I hope someone can answer
> something for me.
>
> Suppose I use (lets say 3 or 4) identical USB 12 channel NEMA compatible
> receivers, sit them side by side, and stream the data to a PC. *Should
> the units lock onto the same set of satellites, receive the exact same
> time signals, have the same SNRs, and display the exact same position
> information, or ...
>
> would they all give slightly different positions so that averaging the
> results be an effective method of getting more accurate positioning
> information?

"they all give slightly different positions" <- Yes on this one.

"that averaging the results be an effective method of getting more
accurate positioning information?" <- NO

> Intuitively I'd expect subtly different receiver characteristics,
> potentially causing different satellite locks, differing SNRs, and
> different position values between the units. *I'd suspect that even
> slight differences in the internal clock frequencies of the receivers
> could make a difference.
>
> Anyone knowledgeable have any thoughts on this?

Why averaging the results will not give you increased accuracy could
requires a quite long explanations to be exaustive
Anyway. Averaging you may remove some errors due the receivers, but
the position error does not depends only on the receivers.
Averaging, you cannot remove errors from the sistem (both receivers
are affected by the same error on ephemeris, ionosphere, satellite
clock, ecc...)