I have a SiGe GN3S Sampler v1 and a copy of A Software-Defined GPS and
Galileo Receiver A Single-Frequency Approach (ISBN-10: 0817643907) that
I am selling for $250.
The sampler is the earlier revision USB2 GPS digitizer that utilizes
SiGe SE4110L GPS Front End ASIC. Its bandwidth is suited for GPS but is
too narrow for Galileo reception.
The book describes implementation of a SDR GPS receiver and provides
Matlab code and digitized samples for experimentation.
Look up http://ccar.colorado.edu/gnss/ for more information on this