Patent ID: 7592943
Filing Date: 2009-09-22
Classification: G01S

Abstract:
1. A frequency modulated continuous wave (FMCW) radar comprising; a frequency sweep generator for producing a swept frequency signal; a discriminator for receiving a portion of the swept frequency signal and for producing a reference difference-frequency signal of frequency equal to the difference between the frequency of the swept frequency signal and the frequency of a time displaced swept frequency signal derived from the swept frequency signal, said discriminator comprising an optical delay means for producing the time displaced swept frequency signal; a transceiver for generating the signal to be transmitted by the radar from the swept frequency signal and for receiving returned target signals, the transceiver also producing a target difference-frequency signal of frequency equal to the difference between the frequency of the signal transmitted by the radar and the frequency of the signal returned to the radar from a remote target(s); and an analogue-to-digital converter (ADC) for sampling the target difference-frequency signal at a rate derived from the frequency of the reference difference-frequency signal, and producing a linearized open loop digitized target difference-frequency signal.