The data files from the roof tests are MAT files you can load into MATLAB
Each file has two variables : bestpos and sv

bestpos is a Nx9 matrix:
column 1:   time of week
2:   solution status
3:   position type
4:   lat.
5:   lon.
6:   height (above MSL)
7:   lat. STD
8:   lon. STD
9:   height STD

sv is a Kx2 matrix:
column 1:   time of week
2:   PRN



For every time tag there is one best pos
For every time tag there are multiple SV's