This software will run with the sample RF data which can be downloaded from ( https://drive.google.com/open?id=0B8Qayko9Dkw4LU1VUWl5SDZMbUU ). To use, update the path to Feb6.bin in initSettings.m and run 'init'. This code can be used for other RF formats by changing the data type, file type, data size, IF and sample rate as appropriate. Using the data linked above, you should be able to replicate the results from this post ( http://sdrgps.blogspot.com/2016/08/softgnss-w5-satellites.html ). Additional data sources can also be found in that post for future experimentation.