Patent ID: 6130607
Filing Date: 2000-10-10
Classification: G01S,H01Q

Abstract:
A back-up protection sensor for a vehicle having working machinery, the sensor comprising:a substantially unidirectional antenna;a Doppler detection unit operatively coupled to the antenna, the detection unit generating a radio frequency signal of from about 450 MHZ to about 1.5 GHZ, the antenna radiating the radio frequency signal and receiving a signal reflected from a conductive body in relative motion with respect to the sensor, the conductive body being within a predetermined detection region, the detection unit further generating a sensor output signal responsive to a difference in frequency between the radio frequency signal and the reflected signal; anda vehicle interface processor, the interface processor being responsive to the sensor output signal and providing a control signal to disable the operation of the working machinery upon the sensing of the conductive body in relative motion with respect to the vehicle.