扩频技术在浅海水声测距中的应用

Application of spread spectrum technology in underwater acoustic distance measurement system in shallow sea

传统的水声系统由于主要使用单频脉冲信号,因而无法克服距离分辨力和作用距离之间的矛盾。文中主要研究如何将扩频编码m序列编码技术应用到水声测距中的方法,既详细分析了浅海水声多途信道的特点,也给出了用于水声测距的扩频数字模型,并进行系统性能仿真与水池试验验证。结果表明:增加m序列码元周期和减小脉宽能够增加测量精度,频谱越宽则抗干扰性越强。该项研究为扩频技术在水声测距与定位中的实际应用提供了较好参考。

Since the traditional underwater system usually uses single frequency pulse signal, there is a contradiction between range ambiguity and ranging accuracy. This paper mainly studies the application of the m-sequence spread spectrum technology into the underwater acoustic distance measurement system. It analyzes in detail the multipath feature of the underwater channel, and presents the model of the direct-sequence spread-spectrum, as well as the system performance simulation and the pool testing certification. The results show that the increase of the m-sequence symbol period and the reduce of the pulse width can improve the measurement accuracy, and the wider the spectrum, the stronger the anti-interference. It can be a good reference for the practical application of the spread spectrum technology in the underwater acoustic distance measurement..