Patent ID: 6426716
Filing Date: 2002-07-30
Classification: G01S

Abstract:
A radar Doppler transceiver apparatus comprising:a PRF generator for producing a sequence of clock cycles; a modulated delay element connected to the PRF generator for producing a modulated delay; a transmit pulse generator connected to the modulated delay element for generating a transmit pulse having a modulated delay; an adjustable delay element connected to the PRF generator for producing an adjustable fixed delay; a mixer pulse generator connected to the adjustable delay element for generating a mixer pulse, the mixer pulse having an adjustable plus modulated delay relative to the transmit pulse; a summation circuit connected to the transmit and mixer pulse generators; an RF oscillator connected to the summation circuit for producing a pair of RF bursts from each clock cycle, a transmit burst and a mixer burst, the mixer burst being delayed from the transmit burst by an adjustable plus modulated delay; an antenna connected to the RF oscillator for transmitting the transmit burst towards a target; a mixer connected to the antenna for mixing reflected bursts produced by the transmit burst with the mixer burst to produce a modulated mixer signal; an IF filter/amplifier for rejecting unmodulated mixer outputs and amplifying modulated mixer outputs; an envelope detector for demodulating the modulated and amplified mixer outputs and producing a Doppler signal; a baseband filter/amplifier for conditioning the Doppler signal and providing a range gated Doppler signal output.