GPS-SDR + USRP1 PVT performance

Hi,
I wonder if someone could tell me the performance in PVT solution
obtained
with the combination GPS-SDR + USRP1.
Actually, I’ve found just few works in the Web… (for example
www.cttc.es/resources/doc/090608-gnssdemo-64145.pdf ).

… some other published examples ?

Further, in detail, could someone tell me if has experienced any problem
with the clock instability (20ppm specification) in GNSS applications ?

Thank you
Cheers
Luca


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