Vehicle diplex doppler near-obstacle detection system

Details Vehicle diplex doppler near-obstacle detection system Vehicle diplex doppler near-obstacle detection system

G - Physics

01

S

343/13, 343/45,

G01S 13/32 (2006.01) G01S 13/34 (2006.01) G01S 13/50 (2006.01) G01S 13/56 (2006.01) G01S 13/93 (2006.01)

Patent

CA 2000166

VEHICLE DIPLEX DOPPLER NEAR-OBSTACLE DETECTION SYSTEM Abstract of the Disclosure A vehicle near-obstacle detector in the form of a diplex Doppler radar system provides range information between a vehicle and an object based on the phase shift between a pair of Doppler signals derived from two transmitted radar signals at slightly different frequencies. A speed dependent error introduced by the time constant of a filter circuit converting duty cycle range information based on the phase shift to an analog signal is compensated by introducing a small time shift in the signal path of one of the Doppler signals to effect a shift in the duty cycle range information. This control is particularly useful in vehicle backing up situations.

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