巴克码在复合声呐信号中的应用

摘要

The-transmitted-waveform-directly-affects-the-performance-of-sonar-at-range-resolution,-velocity-resolution,-low-interception-ability-and-anti-reverberation-ability.-Therefore,-the-design-and-proper-selection-of-waveform-show-an-important-significance-to-sonar-system.-Barker-code,-whose-ambiguity-function-is-close-to-ideal-thumbtack-shape,-bears-high-time-frequency-resolution.-Resolution-and-anti-reverberation-performance-of-the-complex-sonar-signals-based-on-Barker-code-are-analyzed-by-ambiguity-function-and-Q-function,and-are-compared-with-those-of-Continuous-Waveform(CW)-signal-and-Linear-Frequency-Modulation(LFM)-signal.-Simulations-indicate-that-complex-sonar-signals-based-on-Barker-code-are-featured-with-a-relatively-high-resolution-in-range,and-a-relatively-high-reverberation-suppression,which-make-them-the-prioritized-waveforms-for-active-sonar-operating-in-shallow-water.%信号波形直接影响着声呐对目标的时延分辨力、频移分辨力、低截获能力及抗混响能力。因此，设计和选择合适的波形对声呐系统有着极其重要的影响。巴克(Barker)码的模糊函数呈理想的“图钉型”，具有良好的时频分辨力。本文利用模糊函数和 Q 函数，对基于巴克码的复合声呐信号的分辨力、抗混响等性能进行了仿真分析，并和传统的单频矩形脉冲(CW)信号、线性调频脉冲(LFM)信号进行了比较，得出基于巴克码的复合声呐信号能够实现较高的测量精确度，而且在一定的多普勒频移范围内具有较好的抗混响能力，是浅海中主动声呐的优先选择信号。