小波变换在水声定位数据后置处理中的应用

Application of Wavelet Transform in back data processing of acoustic positioning system

水声定位系统在工作过程中由于受到环境噪声和多途信号的干扰会导致定位结果出现异常跳变点即野值。提出一种水声定位数据后置处理方法,该方法首先对目标原始定位轨迹进行预处理,然后利用小波变换的方法对预处理后的轨迹进行野值剔除和滤波平滑,得到新的目标轨迹。利用该方法对某长基线水声定位系统海上试验数据进行轨迹平滑,并与卡尔曼滤波轨迹平滑结果对比,对比结果证明了该方法的有效性。

Outliers will appear in the acoustic positioning system because of the interference from background noise and multi-path signal.A method of back data processing of acoustic positioning system is given in this paper.The original trace is pretreated firstly,then the wavelet transform is used to remove the outliers in the pretreated trace and smooth the trace then the new trace is generated.The method is used in processing the experiment data of a long base line acoustic positioning system and compared with the result using Kalman filter trace smoothing method.The result of processing proves the validity of this method.