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被动测距声呐中的关键技术问题是对两对水听器所接收信号的时间差进行估计.通常,这种时延估计的误差用Crammer-Rao下限来描述.本文利用现代估计理论中的Ziv-Zakai方法,结合被动测距声呐的特点以及有关模拟计算结果,对这种时延估计中的信号模糊问题进行了讨论.结论是:被动测距声呐时延估计中的信号模糊影响具有普遍性.在声呐的设计中可利用Ziv-Zakai理论作为分析工具,讨论各参数的取定,也可利用该理论对已知声呐系统的技术指标进行预估.
The key technical issue in passive range sonar is to estimate the time difference of the signals received by the two hydrophones.The error of this delay estimation is usually described by the Crammer-Rao lower bound.In this paper, we use the Ziv- Zakai method, combining with the characteristics of passive range sonar and the related simulation results, the problem of signal ambiguity in this kind of time delay estimation is discussed.It is concluded that the signal fuzzy influence in the passive ranging sonar time delay estimation is universal. In the design of sonar, Ziv-Zakai theory can be used as an analysis tool to discuss the determination of each parameter. The theory can also be used to predict the technical indicators of the known sonar system.