hi...
as you may know iranian govt (and some other countries) use territorial jammers to disturb satellite signals. i've seen a lot about jamming cancellation using beam forming methods but my question is:
does any method exist that can be applied to this special problem? considering that any recommended method should perform signal processing after LNB ,
my initial guess is to use an array antenna and a FPGA board to process data between LNB and receiver and use a beamforming method but i dont know much about the output of LNB and jamming effects on that i will appreciate any help on this issue too
It may be better done on the "analog" side:
Assume one antenna directed to the transmitter of interest, a second slightly off this path. While one antenna will receive the signal-of-interest plus jamming, the second only the jamming. Subtracting the second from the first (plus eventually adjusting gain and phase) will result in cancelling out of the jamming signal. All that provided that the jamming signal does nor "overdrive" your LNBs.
Does this help?
Phase estimation (or signal runtime estimation) can be done by finding corresponding "points" (eg. peaks, spikes etc. of the jamming) in both input signals. If the jammer is stationary, this is a one-time job.
I see more difficulty in adjusting differing gains, especially if the LNBs implement AGC. (Otherwise this might be a one-time job as well.)
Good luck with that.
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