US 6,633,254 B1Granted

Self-modulating remote moving target detector

AssigneeBAE Systems Information and Electronics Systems Integration Inc.

InventorEldon Sutphin

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Abstract

A self-modulating, remote, moving target detector for intrusion alarms, vehicle detection, and remote speed and distance measurement that includes a remote continuous wave radar transceiver that is used to detect moving targets. The same frequency used for the radar transmission is modulated in a continuous manner in order to transmit radar data concerning a moving target to a remote location away from the radar transceiver. The transceiver oscillator is self-modulated by the reflected signal received from a moving target in the transceiver and retransmitted such that the primary radar signal becomes the information carrier concerning the moving target, which is received remotely, in order to activate an alarm or a display system showing the moving target. The system could be utilized with any frequency from audio to light, with RF and microwave of primary interest.

A moving target detector for providing a remote intrusion alarm comprising:

a radio frequency transceiver for transmitting a continuous wave for use as a transmitted radar signal and a receiver for receiving a reflecting radar signal;
a remote radio frequency receiver remotely located from said transceiver for receiving a modulated transmitted radar signal;
said transceiver including a RF voltage controlled oscillator generating a continuous wave at a pre-determined radio frequency;
an antenna electrically coupled to said voltage controlled oscillator for transmitting a continuous radar signal and for receiving reflected radar signals, including signals reflected from a moving target;
a power divider connected to the output of said voltage controlled oscillator;
RF circulator connected to the output of said power divider for receiving said continuous RF wave from said voltage controlled oscillator, said circulator being electrically coupled to said antenna for transmitting said RF continuous wave and for receiving a reflected radar signal;
an RF signal mixer having an input connected to the output of said power divider that receives the radio frequency wave from said voltage controlled oscillator and having an input connected to the output of said circulator for receiving said reflected radar signal from said circulator, said mixer detecting the frequency and phase differences between the transmitted radar signal and reflected radar signals from a moving target, the output of said mixer being connected as an input to the voltage control oscillator for modulating the signal generated by the voltage control oscillator;
said transceiver providing for modulation of the generated RF radar signal for transmission representative of the Doppler shift between the transmitted radar signal and the reflected radar signal received;
transmitting the radar signal to said remote receiver for processing the modulated information that represents information concerning a moving target;
and
an alarm connected to said remote receiver that is activated by moving targets signal information received.

8 more elements

Abstract

Claims11