On Thu, 30 Mar 2017 19:56:31 -0400
Bob kb8tq <[email protected]> wrote:
> > Doppler is pretty big when the spacecraft is coming or going at the
> > horizon, about 5 kHz (out of 1.5 GHz, so 4-5 ppm).
> > Relatively speaking, GPS satellites are moving slowly (a few km/s)
> >
>
> So somewhere in the baseband processor code somebody said “we’ll handle +/- 5
> KHz”. If your LO is < (say) 500 Hz it’s still inside the likely doppler
> handling range.
>
> If you want to do carrier phase then maybe you want to get a bit fancier ….
You have a carrier PLL anyways. What we call "carrier phase" is just
using the information from that subsystem to get a better estimate
for the time differences.
Attila Kinali
--
It is upon moral qualities that a society is ultimately founded. All
the prosperity and technological sophistication in the world is of no
use without that foundation.
-- Miss Matheson, The Diamond Age, Neil Stephenson
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