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.
