DS-SS在水声跟踪定位系统中的性能分析

Analysis of DS-SS performance in underwater acoustic tracking & positioning system

传统的水声跟踪定位系统使用单频脉冲信号(Continuous Wave,CW)。CW信号系统容易实现,但却存在很多缺点:对多径干扰敏感、无法多址、无法解决距离分辨力与作用距离之间的矛盾、保密性差等。扩频技术(Spread Spectrum,SS)能够克服CW信号系统的缺点,在通信中有着广泛的应用。在浅水区域,直接序列扩频(Direct Sequence Spread Spectrum,DS-SS)是更适合于水声信道的扩频技术。讨论了一种直接序列系统模型,并仿真了这种模型的抗多途干扰性能、多用户性能、抗单频干扰性能。仿真结果显示此模型性能优良,实用性强。

Continuous wave（CW） is commonly used in traditional underwater acoustic tracking positioning system,and CW signal is easy to be implemented.However,it has many disadvantages,such as sensitive to multipath interfe-rence,multiple-access impossible,unable to solve the contradiction between range and resolution,and low security.SS（spread spectrum） technology can overcome such disadvantages,and is used widely in communication.In shallow water area,DS-SS is the more suitable SS technology for underwater acoustic channel.A DS-SS model is discussed and the simulation about the performance of anti multipath interference,multiple-access,and anti tone interference has been done.Simulations show that the model has good performance and potential applications.