Back-up protection sensor for a vehicle

A protection sensor for a lawn vehicle includes a substantially unidirectional antenna operatively coupled to a Doppler detection circuit. The Doppler detection circuit generates a radio frequency signal which is radiated by the antenna. When the radiated signal strikes an object, such as a person,...

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Bibliographische Detailangaben
Hauptverfasser:	ZUERCHER, JOSEPH CHARLES, MCCLANAHAN, DAVID LEE, PAHL, BIRGER
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AGRICULTURE ALARM SYSTEMS ANALOGOUS ARRANGEMENTS USING OTHER WAVES ANIMAL HUSBANDRY ANTENNAS, i.e. RADIO AERIALS BASIC ELECTRIC ELEMENTS DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES ELECTRICITY FISHING FORESTRY HARVESTING HUMAN NECESSITIES HUNTING LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING MOWING ORDER TELEGRAPHS PERFORMING OPERATIONS PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION SIGNALLING SIGNALLING OR CALLING SYSTEMS TESTING TRANSPORTING TRAPPING VEHICLES IN GENERAL VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR
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Beschreibung
Zusammenfassung:	A protection sensor for a lawn vehicle includes a substantially unidirectional antenna operatively coupled to a Doppler detection circuit. The Doppler detection circuit generates a radio frequency signal which is radiated by the antenna. When the radiated signal strikes an object, such as a person, animal or another moving lawn vehicle, within a predefined detection region of the sensor, the signal is reflected and received by the antenna. The Doppler detection circuit generates an output signal responsive to a difference in frequency between the radiated signal and the reflected signal, thereby indicating the presence of the moving object within the protection region of the sensor. The unidirectional antenna virtually eliminates false detections generated by the lawn vehicle, to which the sensor is mounted, or by the operator of the vehicle.