Patent ID: 8686893

Claim:
A radar device comprising: transmitting and receiving means for emitting radar waves and receiving echoes of signals of the radar waves which are reflected by various types of objects as detection targets; detection means for detecting a signal intensity of each arrival echo on the basis of the received signals of the arrival echoes received by the transmitting and receiving means; change amount calculation means for calculating a change amount Y which is a difference between a current signal intensity P of a current arrival echo and a previous signal intensity Pb of a previous arrival echo detected by the detection means before a predetermined observation period T SW corresponding to the current signal intensity P of the current arrival echo; probability distribution memory means for storing, every type of the objects as the detection targets, a probability distribution of the change amount Y of the arrival echo transmitted from each type of the object, calculated on the basis of the arrival echo as the radar wave reflected by the object of each type and arriving at the transmitting and receiving means; and judgment means for judging the type of the object by which the radar wave is reflected and from which the arrival echo arrives at the transmitting and receiving means corresponding to the change amount Y calculated by the change amount calculation means on the basis of the probability distribution of every type of objects stored in the probability distribution memory means, wherein a transmitting wavelength Î» of the radar wave and the predetermined observation period T SW are determined on the basis of the change amount Y of the signal intensity P of the arrival echo which is adjusted by fluctuation generated by the object of each type as the detection target.