| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal arrival azimuth calculating method leaving no vagueness of the azimuth in measuring the signal arrival azimuth by forming a plurality of beams by a straight array arranged with receiver sensors straight. SOLUTION: A plurality of beams are formed 20 by a straight array 10, the port and starboard azimuthsθL(t) andθR(t) are defined to be the relative azimuth time series from the detected (30) maximum output azimuthθ(t), the relative azimuth time series is converted (50) into the absolute azimuth time series, the N1 point at the time tk -tk+ N1-1 is taken out of the port and starboard absolute azimuth time series, the port and starboard mean azimuths are calculated (60), the port and starboard estimated error and its variance are calculated (91) from the measured port and starboard absolute value at other time tm -tm+ N2-1 and the mean azimuth, and the true signal arrival azimuth is judged (100) by using the threshold Fth for certification with the ratio of the variance of the estimated error as the F certification quantity.
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