[time-nuts] Timing performance of servers

David davidwhess at gmail.com
Fri Oct 26 18:48:39 UTC 2012


On Fri, 26 Oct 2012 12:53:02 -0500, Dennis Ferguson
<dennis.c.ferguson at gmail.com> wrote:

>> Also, some antennas are better at rejecting low angle signals than others. While the software can reject some undesired signals, it can only do so if the software can identify them as separate. If the multipath signal destructively interferes with the desired signal, there is not much the software can do.
>
>Given that the transmitted C/A bandwidth is greater than 1 MHz, however,
>I'm not sure that it is possible for multipath signals to destructively
>interfere across the entire bandwidth; I think the issue is distortion,
>with some frequencies in the bandwidth suffering destructive interference
>while others are constructively interfered with.  This can be compensated
>for in software, though it is much better not to have to.
>
>Dennis Ferguson

I thought the problem for GPS was not frequency selective fading
caused by multipath but locking onto the delayed signal and generating
the wrong range to the satellite.



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