AVSPOS extracts the available satellite position (XYZ) XYZ=avspos(X,Y,P1,P2) extracts the visible satellites, which are described in P2, from the matrix X. The output XYZ is a N-by-3*M matrix with the coordinates of the visible satellites.

SKYPLOT for a given receiver position Y=skyplot(X,PRN,C,O) draws the skyplot for the receiver position. The required inputdata for the calculation of the skyplot X is N-by-3*M matrix, where N are the timesteps and M is the number of the Sat