METHOD FOR SUPPRESSION OF SIDE LOBES OF RADAR WHICH USE COMPRESSION OF PHASE-CODE- MANIPULATED SIGNAL Russian patent published in 1997 - IPC

FIELD: radars. SUBSTANCE: method involves simultaneous output of two pulse phase-code- manipulated signals of same duration, binary phase manipulation and identical number of samples in given direction. Carrier frequency of second signal f(2) differs from carrier frequency of first signal f(1) by delta f which is greater than signal spectrum. Signals which are reflected from target are filtered in two parallel channels which amplifies signals, and convert them into identical intermediate frequencies f-in. Then each signal is amplified for second time, and subjected to band-pass filtration at intermediate frequency, delayed for duration of one sample of phase-code- manipulated signal. Non-delayed and delayed signals are added and subtracted. Added and difference signals are detected. Envelope of difference signal is subtracted from envelope of added signal. Resulted video signal is subjected to balanced filtration. Compressed signals are added. Codes of phase-code-manipulated signals conforms to condition that code of first video signal and code of second video signal are simultaneously additional sequences. EFFECT: decreased level of side lobes. 1 tbl, 3 dwg