Patent ID: 7148841

Claim:
A radar device comprising: a code generator that generates a spectrum spreading code and a despreading code; a transmission section that transmits a signal modulated with the spectrum spreading code; a reception section that receives a reflection wave of the signal, which is transmitted from the transmission section and reflected by a target; a delay section that delays the despreading code stepwise; a despreading process section that applies a despreading process to a signal received by the reception section, with using the despreading code delayed stepwise; a correlation value detection section that detects a correlation value from data output from the despreading process section; a target detection section that determines as to whether or not a target is present, based on the detected correlation value; an estimation section that estimates a reception intensity of a reflection wave from a target located at a first distance from the radar device, on a basis of the correlation value detected by the correlation value detection section; an acquisition section that acquires a cross-correlation value between the first distance and a second distance, on a basis of (x) the estimated reception intensity of the reflection wave from the target located at the first distance, (y) a delayed despreading code used to detect a correlation value for the first distance and (z) a delayed despreading code used to detect a correlation value for the second distance; and a correction section that corrects the correlation value for the second distance, which is detected by the correlation value detection section, on a basis of the cross-correlation value acquired, wherein: the first distance is different from the second distance.