On Thu, 22 Nov 2001, Eugene Leitl wrote: > Given that a GPS receiver gets ephemeris data, almanach data and > pseudorandom code from each currently visible sat it has probably to do > with the latter. Consider S/A (which may or may not be switched off now, I > haven't checked): if you've got a secret part of the key you can refine > your position despite deliberate degradation (selective availability) than > the party without the key.
Forgot the URL: http://www.csr.utexas.edu/texas_pwv/midterm/gabor/gps.html The PRN is a tapped feedback shift register.