| 摘要 |
PROBLEM TO BE SOLVED: To enable measurement of high accuracy with less data amount. SOLUTION: A reflection wave is orthogonally tested by a transmitted wave (21), and the tested wave output is taken a complex data series and N data columns are taken as vector and an auto correlation row of the vector is obtained (28). Average correlation row of K×K (K=(N+1)/2) in which correlation between respective reflection wave is oppressed is obtained by calculating average of a space of the auto correlation row (29) while evaluation function to time is obtained by applying MUSIC (Multiple Signal Classification) method (31) and time to be a peak of the evaluation function is obtained (36) and distance from the peak time to a reflected target is operated (37).
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