Cancellation system for transmitter interference with nearby rec

Details Cancellation system for transmitter interference with nearby rec Cancellation system for transmitter interference with nearby rec

1984-02-24

1987-04-21

Tubbesing, T. H.

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

342194, 342 13, 455 79, G01S 742, H04B 148

Patent

active

046600426

ABSTRACT:
Interference from frequency modulated transmitter signals, such as radar jamming signals, is cancelled in a nearby receiver by orthogonally related cancellation signals derived from the transmitter signal. The cancellation signals are controlled or modulated by corresponding cancellation modulation signals derived from the transmitter frequency modulation signal superposed on weighting signals. The employment of the transmitter frequency modulation signal as part of the cancellation modulation signals reduces cancellation error resulting from differences in frequency dependent delay shift in different transmission paths for the interfering signal and the cancellation signal.

REFERENCES:
patent: 3021521 (1962-02-01), Hutchins
patent: 3699444 (1972-10-01), Ghose et al.
patent: 3810182 (1974-05-01), White et al.
patent: 4064511 (1977-12-01), Manfanovsky
patent: 4423505 (1983-12-01), Greig
patent: 4475243 (1984-10-01), Batlivala et al.

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