Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-05-27
1978-06-13
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5SM, 343 77, 343 171PF, G01S 728, G01S 902, G01S 942
Patent
active
040952223
ABSTRACT:
A method and apparatus is described for the post processing of return signal data in a single channel medium PRF pulse doppler radar receiver. The disclosure is directed to preventing sidelobe return signals from being displayed as "ghost" or "false" targets. The received signal data is preliminarily processed by a filter bank and a CFAR threshold circuit to remove main beam clutter and area sidelobe clutter returns. The preliminarily processed data is then temporarily stored as two parallel correlations are performed on a range cell by range cell basis to identify range cells which contain discrete sidelobe clutter return signals. One of the parallel correlations is performed on the data after it has passed an STC (Sensitivity Time Control) threshold circuit and the other parallel correlation is performed on the raw data. The outputs of the parallel correlators are compared. The identified range cell correlations in the raw data correlator are compared with corresponding range cells of the STC's correlations to identify range cell numbers which contain discrete sidelobe clutter return signals. Identified range cell numbers are blanked from the raw data before it is correlated for a third time. The output of the third correlator identifies the true target return signals and the corresponding unambiguous range thereof.
REFERENCES:
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patent: 3949398 (1976-04-01), Donahue
patent: 3955196 (1976-05-01), Nirasawa et al.
Hubler Malcolm F.
Patterson H. W.
Westinghouse Electric Corp.
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