||Harbor defense has always been a topic of great concern to many countries and the direction of development. In this paper, an underwater listening array system will be integrated to detect underwater targets in Kaohsiung Harbor. Include：|
1. Hardware integration (analog to digital recorder, 4 underwater microphones, power supply wiring)
2. Signal design (linear frequency modulation signal)
3. Power supply configuration (lithium battery *4)
4. Signal processing technology
In order to correctness of array system, the measurement experiment in May and June 2017, and the test site was near Ryukyu. The calibration experiments were performed on the system to test the correctness of the system. After completing the system test, return to Kaohsiung Port for passive and active acoustic experiments. In the passive experiment, understand the voiceprint of different targets in the harbor and the frequency band of Kaohsiung Harbor noise. In the active experiment, the self-transmission and acoustic experiments are performed, and the signals are transmitted to the underwater target, and the echo is received through the array to detect it.
The experimental results show that the underwater listening array system integrated in this study can detect underwater targets through active sonar. When the target is reached, the system will not receive the echo of the target due to the boundary effect. Therefore, in this paper, the solution to the target echo in the harbor environment will be discussed, and the method will be applied to Kaohsiung Port.