Bae Systems Electronics Limited

Selex Sensors and Airborne Systems Limited

George Edward Matich

Raymond John Walls

David Henry Ramsey

A continuous wave ranging system, comprising a modulatorfor modulating an r.f. carrier wave in accordance with a pseudo random code, a transmitting antennafor radiating the modulated signal towards a target, a receiving antennaand receiverfor detecting the signal reflected back from the target, a correlatorfor correlating the reflected signal with the transmitted code with a selected phase shift corresponding to the current range gate to be tested, whereby the range of the target from the system may be determined, a storecontaining a plurality of different pseudo random codes, and selector meansarranged to supply to the modulatorand to the correlatora code from the storewhich code does not produce a breakthrough sidelobe in at least the next range gate or gates to be tested.

Ranging systems

A continuous wave ranging system, comprising a modulatorfor modulating an r.f. carrier wave in accordance with a pseudo-random code, a transmitting antennafor radiating the modulated signal towards a target, a receiving antennaand receiverfor detecting the signal reflected back from the target, a correlatorfor correlating the reflected signal with a transmitted code with a selected phase shiftcorresponding to the current range gate to be tested, and meansfor processing the range/amplitude data from the correlatorto discriminate between reflections due to the target and those due to other objects adjacent to the target.

Multiple target ranging system

An aircraft radar and altimeter system, comprising a radio transmitter and a transmitting antenna for radiating a beam of radio energy, a radio receiver and receiving antenna for receiving radio energy reflected from the ground, processing means for comparing the signal received by the receiver with the signal transmitted by the transmitter and determined from the comparison the instantaneous altitude of the aircraft above the ground, and means for changing the direction of radiation of the beam relative to the aircraft to compensate for changes in the attitude of the aircraft relative to the horizontal about at least one of the fore and aft and side-to-side axes.

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Basildon, United Kingdom

George Edward Matich