Correct: I was thinking how to simulate an only bird. The RACAL GPS101 is a single channel simulator and maybe made that way. Then it is possible to place a number of 1 channel simulators at a distance...
On Sat, Dec 17, 2011 at 3:18 PM, Magnus Danielson < [email protected]> wrote: > On 12/17/2011 02:37 PM, Azelio Boriani wrote: > >> Jim, you're right a DAC is not needed: I was thinking of generating the >> BPSK by a DAC but it is not necessary. I have seen some BPSK hardware >> modulators: easier than generating samples and feeding a DAC. >> > > For a single bird a digital output could be made to work, but for a > constellation you would need individual bits which would then be mixed > together using a resistor network since the birds will not have the same > information due to different PN-cods, same rate since they will have > different doppler rates etc. etc. Having a three or four bit DAC would be > an alternative. Also, the square carrier waves would require more filtering > than what a few-bit sine would require. > > So, saving a DAC is not necesserilly as smart as it looks. > > Looks like there is room for a GPS/GNSS receiver and simulator list. > > Cheers, > Magnus > > _______________________________________________ > 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.
