Clifford Kelly's Open Source Zarlink Receiver: http://home.earthlink.net/~cwkelley/

Peter Bennet GPS Site  http://vancouver-webpages.com/pub/peter/

Peter Dana  GPS site:   http://www.colorado.edu/geography/gcraft/notes/gps/gps_f.html

GPS ICD-200 Document:   http://www.navcen.uscg.gov/pubs/gps/icd200/

Spread Spectrum Scene, Spread Spectrum Technology: http://sss-mag.com

Matjaž Vidmar, S53MV, GPS receiver and much more:  http://lea.hamradio.si/~s53mv/

Andew Holme, Fractional N Synthesis, Spectrum Analyzers, Ethernet and much more:  http://www.holmea.demon.co.uk/