Cushman, Darby & Cushman IP Group of Pillsbury, Madison & Sutro LLP
FMCW radar system for detecting distance, relative velocity and azimuth of a target obstacle
 Beat signals of respective receiver channels CH1 and CH2, produced by mixing their receiving signals with a transmission signal, are subjected to Fourier transformation to detect the frequency and phase of peak frequency components in both an ascending-section where the frequency of the transmission increases and a descending-section where the frequency of the transmission decreases. Based on peak frequency components derived from the same target, phase differences .DELTA..phi.u(i) and .DELTA..phi.d(j) between receiver channels CH1 and CH2 in the ascending- and descending-sections (steps 210-230). Relative relationship between the transmission signal and the receiving signal is judged based on the signs of the phase differences. Respective peak frequencies fu(i) and fd(j), detected as absolute values of frequency differences between the transmission signal and the receiving signal, are given sings in accordance with the judgement result. Then, the distance D and relative velocity V of the target are calculated (steps 240-260). 
Denso Corporation
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Akihiso Hiroshi Hiroshi Hiroto Hiroshi
Fujita Naganawa Mizuno Nakatani Hazumi