| 摘要 |
PROBLEM TO BE SOLVED: To accurately detect the distance to an object with no error by selecting one distance from multiple distances obtained from the phase difference via the relative speed information. SOLUTION: A distance detecting means M1 obtains the distance to an object based on the phase difference between the transmission signal and reception signal. A relative speed detecting means M2 detects the relative speed information of the object based on the Doppler frequency between the transmission signal and reception signal. A selecting means M3 selects one distance among multiple distances corresponding to the phase difference as the distance to the object. Multiple distances correspond to the phase difference in the region below±π(rad) and in the region above±π(rad), the changing direction of the phase difference differs in two regions when the object is approaching or separating, one of two regions can be selected based on the relative speed information, and the accurate distance can be obtained.
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