Radar system

Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Missile or spacecraft guidance

Reexamination Certificate

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Details

C342S013000, C342S020000, C342S059000, C342S061000, C244S003150, C244S003190, C343S872000

Reexamination Certificate

active

06952179

ABSTRACT:
A dual mode radar seeker comprising a wide-band passive anti-radar antenna system (3) at the rear of a radome (1), operating at relatively low radar frequencies in an amplitude comparison tracking mode, and a high-frequency (W-band) active amplitude-comparison antenna system (5) in the nose of the radome (1) and having a common boresight with the anti-radar system. The active system employs coarse phase shift steering (31, 41) of the antenna ‘beam’ for the transmit and, optionally, also, the receive ‘beam’. The high frequency and the use of phase shift steering both help to keep down the size of the active radar thus enabling it (5, 7, 9) to be positioned far forward in the nose of the radome (1) so as not to obscure the field of the anti-radar system (3).

REFERENCES:
patent: 3165749 (1965-01-01), Cushner
patent: 4264907 (1981-04-01), Durand, Jr. et al.
patent: 4324491 (1982-04-01), Hueber
patent: 4384290 (1983-05-01), Pierrot et al.
patent: 4477814 (1984-10-01), Brumbaugh et al.
patent: 4562439 (1985-12-01), Peralta et al.
patent: 4652885 (1987-03-01), Saffold et al.
patent: 4776274 (1988-10-01), Kriz et al.
C.R. Seashore et al, “MM-Wave Radar and Radiometer Sensors for Guidance Systems”, Microwave Journal, Aug. 1979 vol. 22, #8, pp. 47-51.

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