Ground velocity sensor with drop-out detection

Details Ground velocity sensor with drop-out detection Ground velocity sensor with drop-out detection

G - Physics

01

S

343/28, 349/34

G01S 15/60 (2006.01)

Patent

CA 1247731

GROUND VELOCITY SENSOR WITH DROP-OUT DETECTION Abstract of the Disclosure A vehicle-mounted ultrasonic velocity sensor includes an ultrasonic transmitter and receiver coupled to transmit and receive horns. In one embodiment, a phase-locked-loop signal processing circuit converts the transmitted and reflected frequencies into a signal indicative of the vehicle velocity. In another embodiment, velocity data is obtained by measuring the period of a certain number of cycles of the reflected signal using a pair of counters, one counting at a rate equal to the reflected frequency, the other counting at a fixed rate. In both embodiments, the variable magnitude reflected signal is applied to an input of a drop-out detection circuit whose output is then connected to an input or inputs of the velocity determining circuits to prevent velocity detection during dropout periods.

492880

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