Patent ID: 7579981
Filing Date: 2009-08-25
Classification: G01S

Abstract:
1. A signal processing method for an FM-CW radar which determines a relative distance and a relative velocity with respect to a target from peak frequencies occurring in an upsweep section and a downsweep section of a triangular FM-CW wave wherein, when said target is a target that has previously been detected, predicted values for the peak frequencies currently detected in the upsweep and downsweep sections are computed from the relative distance and relative velocity previously detected with respect to said target, and it is determined whether any of said predicted values exceeds a detection frequency range, and if there is a peak frequency that exceeds said detection frequency range, said frequency is folded and said folded frequency is taken as one of said predicted values, said method then proceeding to search the currently detected peak frequencies to determine whether there are upsweep and downsweep peak frequencies substantially equal to said predicted values, and if said substantially equal frequencies are found, said found frequencies are folded and said folded frequencies are used to determine the relative distance and the relative velocity.