Hi, On 03/30/2017 03:46 PM, paul swed wrote:
I am curious if the first local oscillator on a GPS receiver must actually be locked or coherent to the reference oscillator in the GPS receiver typically running at some 10 MHz approximately. Or as long as the first LO is quite stable it doesn't matter because the receiver can track the code. This is a question for very classic receivers like Austrons, Odetics etc. Discreet. Modern fully integrated receivers are not in question. Thank you for your insights.
If you only do a code receiver, you can do this, but the carrier tracking will need to compensate the LO. This is naturally possible, but some of the precision will be lost. You can play some tricks to average this from the channels and sort things out.
If you want to do a carrier phase receiver, you would suffer too much, then you would need to lock the LO to get the gain.
For old receivers, I'd just assume the LO is locked, as it saves compensation tricks later, which would save computation cycles.
However, there where some crude receivers back in the days. 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.
