Patent ID: 7602477

Claim:
A radar device comprising: radar means that emits an outgoing wave in a predetermined detection area and outputs a reception signal according to intensity of a reflected wave of the outgoing wave, the reflected wave being reflected by an object; determination means that determines a condition in which no object is present in the detection area; storing means that stores a noise reception signal corresponding to a noise outputted from the radar means in association with emission of an outgoing wave by the radar means when the condition in which no object is present in the detection area is determined and the outgoing wave is emitted by the radar means; differentiation means that calculates a subtraction signal by subtracting the noise reception signal stored by the storing means from the reception signal outputted by the radar means; and object detection means that compares the subtraction signal with a predetermined reference value and detects the object reflecting the outgoing wave based on the subtraction signal equal to or larger than the reference value, wherein the object detection means further includes an analog-to-digital (A/D) conversion means, the radar means emits a plurality of outgoing waves in different directions in the detection area, and the radar device further comprises: summation range specification means that determines a plurality of summation ranges by specifying a number of reception signals corresponding to a number of outgoing waves emitted adjacent to each other and by shifting adjacent summation ranges by a number of reception signals smaller than the specified number of reception signals such that some of the reception signals are included in a plurality of the summation ranges; and summation means that sums summation signals converted by the A/D conversion means from the reception signals for each range determined by the summation range specification means, wherein the storing means stores a noise component of each summation signal; the differentiation means calculates the subtraction signal by subtracting the noise component from the summation signal, and the object detection means sets a reference value in a range lower than a peak value of the subtraction signal, and detects an object based on a comparison between the subtraction signal and the reference value.