水下爆炸声源辅助声呐系统的目标定位和参数估计

系统阐述了利用水下爆炸声源作为发射声源,辅助声呐系统实现水下目标定位和目标方位、距离参数估计的方法。研究了目标散射信号的窄波束混响模型,以及混响背景下的目标方位参数的估计方法。对目标参数估计误差进行研究,证明方位参数、距离参数的估计误差近似满足高斯分布,并推导了距离参数估计误差方差的表达式。利用仿真实验对目标距离参数估计误差及其标准差进行研究,得出了一系列提高距离参数估计精度的措施。仿真和湖试数据处理结果显示,在存在一定爆炸声源距离误差的条件下,本文方法可实现对远距离水下目标的准确定位。

Target localization and parameters estimation by sonar system with explosions as underwater sound sources

Underwater target localization and parameters(azimuth and range) estimation by the method of utilizing explosions as underwater sound sources are described. The narrow beam reverberation model of the target echo signal is researched to estimate the target azimuth in reverberation background. Estimation errors of target azimuth and range are studied and proved to approximately meet Gaussian distribution. Then the variance of target range error is deduced. Simulation experiments are applied to research the target range error and its standard deviation, and a series of measures to improve the estimation accuracy of target range are proposed. It is confirmed by the data processing results of simulations and lake experiments that the proposed method can accurately locate underwater target at a long distance on the condition of a certain underwater explosion range error.