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Vehicular radar system

  • US 7,242,461 B2
  • Filed: 09/28/2005
  • Issued: 07/10/2007
  • Est. Priority Date: 10/01/2004
  • Status: Active Grant
First Claim
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1. A radar system of a vehicle, the radar system having a light emitter for repeatedly emitting laser light so that the laser light is emitted over a predetermined angular range at least along width direction of the vehicle in each light emission, and a photoreceptor for outputting light reception signals, which are output from photoreceptive elements in accordance with intensity of reflected laser light reflected by a reflection object, the photoreceptive elements being arranged at least along the width direction of the vehicle, the radar system comprising:

  • an integrator having, for each photoreceptive element, a plurality of switches for switching connection with the photoreceptor, and a plurality of capacitors respectively connected to the switches for accumulating electric charges corresponding to intensity of the light reception signals;

    a controller for switching the switches to a connected state one after another in a predetermined order at a predetermined time interval until a predetermined time passes after every emission of the laser light, while keeping the switch, which is not switched to the connected state, at a disconnected state, wherein the controller switches the switches to the connected state one after another in a predetermined order at a predetermined time interval if the laser light is emitted predetermined times, in order to make the integrator output integration signals corresponding to the electric charges accumulated in the capacitors; and

    a sensor for comparing the integration signals, that correspond to the respective photoreceptive elements and output by the integrator, with a predetermined integration standard value, and for sensing the reflection object based on the integration signals equal to or greater than the integration standard value.

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