| 摘要 |
PURPOSE:To obtain the accurate horizontal distance between a diving ship and a wave receiver by providing two receivers which are arranged at the same positions of different depth and receive a direct wave and a reflected wave sent from wave transmitter, depth indicators, signal processing parts, and an arithmetic means. CONSTITUTION:The two wave receivers 1A and 1B are arranged at the same position of different depth and receive the direct wave sent from the transmitter 10 and the reflected wave from the surface of the sea. The depth indicators 2A and 2B measure the depths of the two wave receivers 1A and 1B. The signal processing parts 3A and 3B analyze the frequencies of received signals obtained by the receivers 1A and 1B to find two frequencies at which the direct wave and reflected wave has a half-wavelength phase difference. A computer 100 uses the depths of the receivers 1A and 1B obtained by the depth indicators 2A and 2B and the frequencies obtained by the processing parts 3A and 3B to calculate the depth of the transmitter 10 and the horizontal distance L from the transmitter 10 to the receivers 1A and 1B. |
