中文摘要：

水声释放器在海洋环境监测、水下施工和海洋测绘等领域发挥着重要作用。考虑到长期值守对低功耗的要求,传统水声释放器采用简单的非相干频率调制解调方法进行遥控,要求遥控信号有较高的信噪比,因此易被非授权方截获、复制从而导致丢失。基于STM32微处理器设计了一种频率调制结合扩频调制的二级触发释放器遥控系统,该系统在通过作为第一级触发的频率检测后,需对低信噪比扩频信号检测进行二级触发,从而提高系统的可靠性、安全性。海上实验结果表明了该方案的有效性。

英文摘要：

The acoustic release transponder plays an important role in marine environmental monitoring, underwater construction and marine mapping, and so on. Taking into account the low power requirements to support long lifetime, the traditional acoustic release transponder uses simple frequency modulation and demodulation for signal detection, thus the remote control signal is easily intercepted and copied by unauthorized user. To improve the reliability and safety, a scheme of developing a two-level remote control system is presented by incorporating the classic frequency modulation with the spread spectrum modulation. With the proposed method, following the non-coherent detection of frequency modulation signals, the receiver needs to detect the low SNR spread spectrum signal to finish the two-level remote control. Based on STM32 microprocessor, the design and implementation of the proposed scheme is provided. The offshore experimental results validate the effectiveness of the proposed method.