| 摘要 |
PROBLEM TO BE SOLVED: To achieve high distance resolution without expanding frequency modulation bandwidth. SOLUTION: The frequency-modulated continuous wave radar device comprises a sensor section 1 that irradiates a frequency modulation transmission signal due to a saw-tooth-shaped wave and receives a reflective signal reflected by a target for outputting a beat signal BO, having a corresponding frequency deviation width; and a signal-processing section 2A, that detects the null point of the frequency deviation width on frequency spectrum for outputting as a target detection signal L, by connecting the data of either the first or the second half of the beat signal BO with the data of one of the first and second halves set as negative phase. By using the null detection output of the frequency spectrum, where one of the first- and second-half frequency region data of the beat signal BO is obtained as the opposite phase and steeper characteristics are given, distance measurement of higher resolution can be conducted. COPYRIGHT: (C)2004,JPO
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