| 摘要 |
A time needed until measurement values are obtained in a two-frequency continuous wave radar systems is reduced. A target object detection system ( 1 ) that emits to target objects transmission signals ( 22 ), as transmission waves ( 23 ), whose frequencies have been modulated successively into a plurality of stepped frequencies, and receives echoes ( 24 ) of the transmission waves ( 23 ) reflected from the target objects, thereby to calculate relative velocities of the target objects by frequency-analyzing reception signals ( 25 ) obtained from the received echoes ( 24 ). The target object detection system ( 1 ) includes: a frequency modulation means ( 2 ) that executes a plurality of times frequency-modulation processes to successively modulate the transmission signals ( 22 ) into those of the stepped frequencies, within a minimum measurement time in which a desired velocity resolution is achieved; and a frequency-analysis means ( 6 ) that frequency-analyzes throughout the plurality of frequency-modulation processes the reception signals ( 25 ) obtained by receiving the echoes ( 24 ) of the transmission signals ( 22 ) modulated into those of an identical stepped frequency in the plurality of frequency-modulation processes iterated by the frequency-modulation means ( 2 ).
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