Cushman, Darby & Cushman IP Group of Pillsbury, Madison & Sutro LLP
FM-CW radar apparatus for measuring relative speed of and distance to an object
 An FM-CW radar which is suitable for automotive anti-collision systems, for example, is provided. This radar outputs a radar signal in the form of a triangular wave whose frequency is increased at a given rate and decreased at a given rate. A receiver receives a wave reflected from a target to produce a beat signal and takes the Fourier transform of the beat signal to determine peak frequency components thereof showing peaks in a frequency spectrum. The receiver also determines phases of the peak frequency components and selects at least one from the peak frequency components in a frequency-rising range wherein the frequency of the radar signal is increased and at least one from the peak frequency components in a frequency-falling range wherein the frequency of the radar signal is decreased which show substantially the same phase to pair them for determining the distance to and relative speed of the target based on the frequency of the paired peak frequency components. 
Denso Corporation
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Hiroshi Hiroshi Akihisa Hiroshi Hiroto
Mizuno Naganawa Fujita Hazumi Nakatani