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US 4,540,978 AGranted
Bistatic pulse-overlap Doppler radar intrusion detection apparatus
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorsBryan L. Burns, Michael W. Callahan
Life of this patent
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Abstract
An intrusion detection apparatus utilizing a plurality of bistatic pulse-overlap Doppler radar units to detect target Doppler frequency shifts in an enclosed sensitive volume and utilizing a single RF frequency with different pulse repetition rates to synchronize the bistatic receiver unit with its associated transmitter unit.
Claims6
A bistatic pulse-overlap Doppler radar intrusion detection apparatus comprising in combination:
- a plurality of Doppler radar units arranged around the periphery of an area to form an enclosed volume, each of said plurality of Doppler radar units comprising a bistatic pulse-overlap Doppler radar having a transmitter unit and a receiver unit, each transmitter unit in said plurality of Doppler radar units transmitting an RF signal which forms a narrow ellipsoidal sensitive volume to an adjacent receiver unit in said plurality of Doppler radar units, each transmitter unit operating on the same RF frequency but on a different pulse repetition frequency than the adjacent transmitter, each receiver unit receiving and synchronizing on the pulse signal received from its associated adjacent transmitter unit by using only that transmitter's RF signal, said receiver units synchronizing only on the direct transmitter to receiver pulse signals, each receiver unit utilizing the overlap between the direct transmitter to receiver pulse signal and the target echo to detect the target Doppler shift.
Dependencies are inferred from the claim text.