The application of interference cancellation to an earth station

The present work describes some interference cancellation equipment which was designed for shielding a ground station from unwanted signals whose intensity is sometimes anomalously large as a result of atmospheric ducting conditions. The system is based on the principle that interference can be removed by adding into the channel an equal amplitude version of the interfering signal in antiphase to the original interference. The system is modeled as a feedback loop containing two multipliers (the correlator and the modulator) in the feedback path. Some test results on simulations of the equipment are reported.