Patent ID: 7773205
Filing Date: 2010-08-10
Classification: G01S

Abstract:
1. An apparatus, comprising: a first wave synthesizer for generating a frequency modulated continuous wave (FMCW) chirp signal from a source signal; a second wave synthesizer for generating a FMCW local oscillator chirp signal from a source local oscillator signal; an optical device for directing the FMCW chirp signal to be reflected off a target and receiving the reflected FMCW chirp signal from the target; a first mixer for combining the reflected FMCW chirp signal and the FMCW local oscillator chirp signal to generate a first intermediate frequency (IF) signal; a second mixer for combining the source signal and the source local oscillator signal to generate a second IF signal; a third mixer for combining the first IF signal and the second IF signal to generate a final IF signal; and a digital signal processor system for performing fast Fourier transform (FFT) processing on the final IF signal to determine range information for the target; wherein a compensation signal derived from a point source test target response is applied to the final IF signal prior to FFT processing to focus the determined range in formation for the target.