Patent ID: 7737882
Filing Date: 2010-06-15
Classification: G01S

Abstract:
1. A radar device, comprising: transmitting means for transmitting an electric wave as a transmission signal from a common antenna, a direction of transmission for said transmission signal by said antenna being one of a plurality of predetermined transmission directions; receiving means for receiving a reflected wave resulting from reflecting the transmission signal from an object as a reception signal; detecting means which mixes the transmission signal and the reception signal together to generate a beat signal for detecting the object therefrom; measuring means for measuring a distance to the object and a relative speed of the object on the basis of the beat signal; unmodulated pulse transmitting means for modifying an unmodulated wave into a pulse and transmitting the pulse from said common antenna in one of said plurality of predetermined transmission directions; A/D converting means for converting the beat signal generated by the detecting means into a digital voltage value when an unmodulated pulse is transmitted from the unmodulated pulse transmitting means at the specific timing, and the reflected wave is received by the receiving means; and dirt detecting means for detecting dirt adhered to a radome of an antenna on the basis of an output of the A/D converting means, wherein the transmitting means selectively transmits the transmission signal in said plurality of predetermined transmission directions of an electric wave beam at a respective predetermined timing, and wherein the unmodulated pulse transmitting means selectively transmits the unmodulated pulse in a given one or more of said plurality of predetermined transmission directions at a specific timing based on a current direction of a transmission signal from said transmitting means.