Radar channel including an orthogonal MTI filter pair

Communications: directive radio wave systems and devices (e.g. – Clutter elimination – Mti

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G01S 1352

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active

046188649

ABSTRACT:
In a radar operating in a moving target indication (MTI) mode with frequency diversity by transmitting N+1 pulse bursts and receiving echo signalling therefrom, a radar channel is included for doppler processing the received N+1 pulse echo signal bursts. Each pulse of the same burst envelopes a fixed carrier frequency. The radar is operative to change the transmitted carrier frequency from one pulse burst to another. The radar channel comprises an MTI filter operative as two different orthogonal MTI filters, each having a frequency response similar to an N-pulse MTI filter, to process functionally in parallel a received N+1 pulse echo signal burst to generate a filter signal from each functional filter. Also included is apparatus for combining the two filter signals non-coherently to generate a composite signal corresponding to the N+1 pulse echo signal burst for target detection. The radar channel is operative to process N+1 pulse bursts with either fixed or variable interpulse periods. The two functionally operative filters have frequency response characteristics substantially similar to each other for target echo signals, but effect uncorrelated noise output signals corresponding to a common N+1 pulse echo signal burst.

REFERENCES:
patent: 3797016 (1974-03-01), Martin
patent: 4318099 (1982-03-01), Hsiao
patent: 4339754 (1982-07-01), Hammers et al.
patent: 4489392 (1984-12-01), Lewis
patent: 4573052 (1986-02-01), Guillerot et al.
"Radar Handbook", by M. I. Skolnik; p. 35-3; McGraw-Hill, N.Y., 1970.
"IEEE Transactions on Audio and Electro-Acoustics" (Sep. 1968); pp. 307-308.
M. Skolnik, Intro. to Radar Systems, (McGraw-Hill, 1980), p. 110.

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