Patent ID: 6778129
Filing Date: 2004-08-17
Classification: G01S

Abstract:
A crossover detection method that is executed in a radar apparatus for calculating the distance of a target and its relative velocity, using a beat signal obtained by mixing a received signal with its original transmitting signal, comprising:calculating distance/relative velocity information indicating the distance/relative velocity, respectively, at a multitude of clock times, based on the beat signal; calculating predicted distance/relative velocity information indicating the distance/relative velocity, respectively, of the target after a prescribed time has elapsed, based on the calculated distance/relative velocity information, respectively; calculating predicted distance/relative velocity errors by subtracting the calculated distance/relative velocity information from the calculated predicted distance/relative velocity information, respectively; calculating degree of similarity information by comparing a predetermined average predicted distance/relative velocity errors with the calculated predicted distance/relative velocity errors, respectively; and determining whether there is crossover, based on the calculated degree of similarity information.