【摘要】 在主动声纳信号波形中,梳状谱信号如调频脉冲传信号(PTFM)和正弦调频信号(SFM)等,因为其优良的抗混响以及速度分辨能力越来越受到人们的重视。然而,由于这类信号的多普勒容限很小,必须采用相当数量的拷贝才能够充分发挥其性能。常规的匹配/相关技术实现多拷贝检测需要的计算量过大,工程上实现难度极大,从而限制了它们在实际工程中的应用。本文充分利用梳状谱信号匹配/相关输出的多峰结构和Parseval定理,提出了一种新的梳状谱信号检测方法以及相应的多拷贝快速算法,并通过实际湖试数据对这种检测方法的正确性进行了验证。该算法同时实现了梳状谱信号匹配滤波/相关输出端多峰的能量累积,有利于检测器输出信噪比的提高以及声纳系统整体性能的改善。更多还原

【Abstract】 Among all the active sonar waveforms,comb-spectrum signals such as Sinusoidal Frequency Modulated(SFM)and Pulse Train Frequency Modulation(PTFM)signals have gained more and more attention due to their superior reverberation rejection and velocity resolution capabilities.However,to fully exploit these benefits,quite a large number of copies tuned to the expected Doppler shifts are needed because the Doppler tolerant velocity is very small.Unfortunately,the implementation of multi-copy detection through the conventional matched filtering/correlation techniques requires such a demanding computation load that it is impossible to be applied practically.Based on their multiple peak structure at the matched falter/correlation output and the Parseval Relation,a new comb-spec- trum signal detection technique and the related multi-copy fast implementation algorithm are proposed.The correctness and effectiveness of the proposed method are validated through the real data obtained from a recent Lake Test.An additional benefit of the proposed meth- od is that the summation of the multiple-peak energy at the matched filter/correlation output is realized inherently which is helpful to the improvement of signal-to-noise ratio at the detector output and the overall performance of the sonar system.更多还原