There was a request off-list for more background on this stuff, because
we're using plenty of jargon. One of the big goals for this group is
education, so I'm eager to help people understand what's going on. But I
don't want to answer questions privately, because I'm sure more people are
confused a
Speaking of Doppler shifts, back when we were doing the GPS class we
were catching satellites at >10kHz Doppler using the recorded data we
found, and that really shouldn't be possible for a receiver at rest
(relative to the Earth surface).
I never looked into it further but i am suspicious of the
Awesome! And nice job on the pretty pictures!
I think this is strong evidence that we should get access to a real
satellite simulator, soon.
Though I don't understand why it saw a -14.8kHz Doppler shift. The original
file is a zero-IF sample. Did you set the HackRF at a center frequency
different
For all you folks following along at home who want to see some pretty
pictures, here you go!
https://drive.google.com/open?id=1pnFV5MWkx5YR9ZlutetgDrejNG9SZx6Zp6xbdKl48Ps&authuser=0
I sometimes have blissful moments of forgetting that Google wants all of
my data, always. In this particular insta
Interesting, good to know; although in this case it's a two-bit ADC
(literally and, perhaps, figuratively?), so it kind of doesn't have
low-order bits to dither. :-)
Considering that the noise floor is higher than the signal amplitude, you
could alternately look at it as being entirely dither, but
I'm happy to get a copy of the file from you next time I see you. I
don't know if we have a sensible place to stick 200MB test files.
I've attached a single cycle of the pseudo-noise sequence from
satellite vehicle #1, in the packed format, IF, and sample rate that
we're using. You can loop it and
