Hi I still think it's a bird on the antenna.
Bob On Mar 25, 2010, at 7:11 PM, Magnus Danielson wrote: > J. Forster wrote: >> From an unnamed, but VERY credible source: >> >> "> It might be that the DoD is turning the civilian signals off in combat >> >>> areas to deny GPS to the Taliban and others. >>> >> >> Quite possible. This countermeasure was discussed more than ten years >> ago. >> >> It is possible to turn of the civilian signals -- or to leave then on >> but _jam_ them within a selected area -- without interfering with US >> military use of the satellites. A modern military does not need the C/ >> A code to acquire lock on a satellite. It can acquire the encrypted P >> code directly." > The preferred method of controlling the access to GPS within a region is > GPS jammers, and the full set of efforts being spent on strengthening > the allied forces availability to signal is to ensure ability to survive > from jamming signal, which includes removing need for C/A locking prior > to Y-code lock with direct lock methods, transfer of time, solutions and > ephemeris data, and eventually means to direct additional power towards > the area and the improved M-code. > > Turning of the C/A code of a satellite will effect the 1/3 of the earth > area that it sees, and for that to be effective in a certain area, you > need to do that to 6-8 sats to turn it off, and that will significantly > reduce the GPS availability for so large geographical areas that things > they want to work will run closer to failure. So no, turning of C/A code > is not what they want to do it. They can, but they want to avoid it. > > Cheers, > Magnus > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.