Joined 12 years ago
Problem of EM sensors is most often then not, are active (especially radars and IFF), they broadcast or ping signals thus leaving quite a huge EM signature that can be pinpointed precisely with 3 antennas.
That is the basics of how people in astronomy clean their signal.
http://beauty-of-imagination.blogspot.fr/2012/09/fun-with-si...
Problem of EM sensors is most often then not, are active (especially radars and IFF), they broadcast or ping signals thus leaving quite a huge EM signature that can be pinpointed precisely with 3 antennas.