GPS receiver

[joris]

subject: "global position system receivers"

I don't understand well why the performance of a multiplex receiver is
still higher than a continous receiver?
In literature they told someting about the integration of the spectrum
of more sattelites but i don't understand it very well..

 

[Peter Bennett]

On 26 Sep 2003 07:26:29 -0700, joris.verhulst@student.khbo.be (joris)
wrote:

subject: "global position system receivers"

I don't understand well why the performance of a multiplex receiver is
still higher than a continous receiver?

I think you have that backwards.

In literature they told someting about the integration of the spectrum
of more sattelites but i don't understand it very well..

Early GPS receivers had a single signal processing channel that was
switched (multiplexed) between the various satellites the receiver was
using to compute a fix. If a satellite went out of view momentarily
when the receiver was trying to get data from it, the receiver could
lose the fix, and take some time re-acquiring satellites.

Current receivers have multiple processing channels (often 12), so
they can process data from multiple satellites simultaneously, and
will usually have data from more satellites than are really needed to
compute a fix. This makes the fix more accurate, and tolerant of loss
of signal from one or two satellites.



--
Peter Bennett VE7CEI
GPS and NMEA info and programs: http://vancouver-webpages.com/peter/index.html
Newsgroup new user info: http://vancouver-webpages.com/nnq