Looking for a simple way to calculate PDOP

[codegu...@gmail.com]

I am looking for a simple way to calculate PDOP. The selected number
of satellites will range from 4 to 8, so basically the algorithm
should support any number of satellites. Could anybody provide some
salt?
Thanks.

[hannan...@gmail.com]

I dont have my book with, but from what i know, there are two ways to
compute the PDOP
1. using the elevation and azimut (for each satellite, then you build
the line of sight (Lets call this matrix A), then in order to get
PDOP, you need to compute $A* A^T$
2. compute the line of sight from the position of the satellite and
the approx. position of the receiver and then compute $A* A^T$

for a stand alone position, you are suppose to get 4x4 matrix and PDOP
is simply the squar of the trace of the diagonal matrix values

$\sqrt{ \sum_{i=1}^4\Tr{ A*A^T}$

Regards.

[Uwe Hercksen]

codegu...@gmail.com schrieb:

Hello,

you may find some information here:
http://en.wikipedia.org/wiki/Dilution_of_precision_(GPS)

Bye

[Sam Wormley]

See: http://www.colorado.edu/geography/gcraft/notes/gps/gif/gdop.gif
http://www.Colorado.EDU/geography/gcraft/notes/gps/gps_f.html

[codegu...@gmail.com]

Thanks a lot. It solves my problem.