Computing Dilution of Precision (DOP) for GPS

Computing Dilution of Precision (DOP) For 4 or More Satellites

For each satellite n define:

n,1 = sin az cos el

 an,2 = cos az cos el

 a n,3 = sin el

Where:

el =Local elevation angle, and az = Local azimuth angle (from North)

 Next, form the line-of-sight matrix A for all satellites used in the solution:

Next, compute the covariance matrix: