| 摘要 |
PURPOSE:To minimize reduction in the wave transmitting/receiving sensitivity product by providing a phase shifting circuit on an active sonar circuit for an acoustic homing apparatus to control the main axis of a wave beam received so that it coincides the direction of receiving waves according to the turning of an underwater navigating body. CONSTITUTION:The curve C indicating the wave transmitting/receiving sensitivity product DI varies with the turning. When the wave transmitting directivity (curve A) coincides with the wave receiving directivity (curve B), the reduction in the wave transmitting/receiving sensitivity product is minimized and increases before and after the point of coincidence. The axis of the wave receiving directivity is controlled to coincide the axis of the wave transmitting directivity regardless of the turning of an underwater navigating body. This maintains reduction in the wave transmitting/receiving sensitivity product at the minimum in the turning. |
