| 摘要 |
PROBLEM TO BE SOLVED: To form specific beam characteristics with a small number of reception elements when forming a reception beam of a sonar by directional synthesizer with space taper method and reduce size and weight of the receiver. SOLUTION: A phase delay circuit necessary for phase matching for directionality synthesizing is constituted of two steps, a phase delay circuit (1)1 and a phase delay circuit (2)2. In the first step phase delay circuit (1)1, a delay ofΔαregarded to have a reception element at a hypothetical position set in accordance with every reception element is given to the reception signal from each reception element. In the second step phase delay circuit (2)2, delay quantity to phasing plane can be given to the reception signal in the hypothetical position, signal used for the reception directionality synthesizing is apparently doubled and a specific beam is formed with a reception element with small number of initial constitution to assure the small-sizing and weight reduction.
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