SHIP SPEED MEASURING DEVICE AND SHIP SPEED MEASURING METHOD

To provide a ship speed measuring device and a ship speed measuring method capable of more accurately measuring the counter water ship speed.SOLUTION: A ship speed measuring device 1 includes: a transducer 20 for transmitting an ultrasonic wave into water and receiving a reflected wave of the ultrasonic wave; and a signal processing circuit 110 for calculating the counter water ship speed of a ship in which the transducer 20 is installed on the basis of a reception signal outputted from the transducer 20. The signal processing circuit 110 specifies, on the basis of the reception signal, the target depth at which the vertical counter water vessel speed is substantially null, and acquires the counter water vessel speed in the traveling direction with respect to the target depth as the counter water vessel speed of the ship.SELECTED DRAWING: Figure 1 【課題】対水船速をより正確に測定することが可能な船速測定装置および船速測定方法を提供する。【解決手段】船速測定装置１は、超音波を水中に送波するとともに超音波の反射波を受波する送受波器２０と、送受波器２０から出力される受信信号に基づいて、送受波器２０が設置された船の対水船速を算出する信号処理回路１１０と、を備える。信号処理回路１１０は、受信信号に基づいて、上下方向の対水船速が実質的にゼロである対象深度を特定し、当該対象深度に対する進行方向の対水船速を船の対水船速として取得する。【選択図】図１