Radar apparatus for vehicle

Details Radar apparatus for vehicle Radar apparatus for vehicle

1999-07-01

2000-09-26

Lobo, Ian J.

Communications: directive radio wave systems and devices (e.g.,

Return signal controls external device

Radar mounted on and controls land vehicle

342128, G01S 1393

Patent

active

061248231

ABSTRACT:
A radar apparatus of the present invention is a radar apparatus for detecting an object around a vehicle, which comprises a transmitter section for radiating a frequency-modulated, transmitted wave a receiver section for receiving a radio wave re-radiated from an object exposed to the transmitted wave and mixing the radio wave received with part of the transmitted wave to obtain beat signals, and a signal processing section for analyzing frequencies of the beat signals to detect the object around the vehicle. This radar apparatus is arranged to set a first threshold value and a second threshold value higher than the first threshold value as to signal levels of a frequency spectrum of the beat signals. The signal processing section is arranged to detect the object around the vehicle, using a beat frequency of a signal level over the second threshold value, and to compare the frequency spectrum with the first threshold value in a predetermined frequency range to determine whether there is dirt on the transmitter section or on the receiver section.

REFERENCES:
patent: 5341144 (1994-08-01), Stove
patent: 5982321 (1999-11-01), Iihoshi et al.

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