Hi Ahhhh, but they did recover the code in addition to the carrier frequency. Given enough gain (and thus directivity) they were able to capture the full transmission from a single bird. They could not pull the almanac data off of it, but the sat's orbital parameters are relatively easy to come up with.
If I remember correctly they came up with some pretty impressive timing numbers. The paper didn't mention any navigation results (gee… I wonder why…). It was the first public paper I attended that started chipping away the value of selective availability. Bob On Mar 30, 2013, at 10:26 AM, Jim Lux <[email protected]> wrote: > On 3/30/13 5:31 AM, Bob Camp wrote: >> Hi >> >> If you go back into the papers from the early 1980's there is one where they >> used a high gain antenna and no knowledge of the coding scheme to pull >> timing off of GPS. I believe it was at White Sands, but that could be wrong. >> > > > One can just run it into a squaring circuit and recover the carrier, for > instance. Recovering accurate carrier frequency isn't going to help you > navigate a ICBM to a hardened target. Knowing the P-code is. > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
