Raytheon Company

Santa Barbara Research Center

John E Clement

Arthur H Hardy, Jr

James F Asbrock

William O McKeag

James S Lee

A method for ranging or targets may include transmitting a pulse of electromagnetic energy at a target. The method may also include generating a time-varying signal in response to receiving a first signal indicating transmission of the pulse of electromagnetic energy. Additionally, the method may include detecting a reflection of the pulse from the target. Moreover, the method may include generating a second signal indicating detection of the reflection. The method may further include generating a third signal substantially equivalent to the second signal delayed by predetermined delay. The method may also include sampling the time-varying signal in response to receiving the third signal.

System and method for ranging of targets

Object detection apparatus (40) inlcudes a transmitter assembly (44) and a receiver assembly (10). The receiver assembly includes a receiver element (12) having an input aperture (16) for receiving electromagnetic radiation reflecting from an object. The receiver element further includes an output aperture (24) and a curved surface (22) disposed relative to the input aperture for reflecting substantially all electromagnetic radiation (A,B,C) reflecting from an object at a range in excess of a range of interest, to the output aperture. A first radiation detector (14) is disposed at the output aperture for receiving the object radiation reflected thereto and for generating a first electrical signal. A second radiation detector (30) is disposed at a location upon the receiver assembly for receiving object radiation reflected thereto that reflects from an object at a range that is within the range of interest. The apparatus further includes circuitry (32, 34, 35, 36, 37, 38, 39) for combining the first electrical signal with the second electrical signal for substantially eliminating a component of the first electrical signal that is due to electromagnetic radiation reflecting from an object within the range of interest.

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Santa Barbara, CA, United States of America

John E Clement