Patent ID: 6633254
Filing Date: 2003-10-14
Classification: G01S

Abstract:
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.