三元阵被动测距浅海试验及后置处理

为改进三元阵被动测距性能,采用了滑动窗互相关器估计时延,与常规互相关器相比时延估计性能有较大提高;采用的方位和距离的改进计算公式,在近程有很高的测距精度。针对实验结果瑕点多的现象,提出了在线自动跟踪剔除瑕点的方法,能稳健有效自动地筛选出高质量的数据,称之为“圆筛”。并引入了“动态滤波”,将其与“圆筛”结合作为后置处理模块。介绍了浅水、近程的三元阵被动测距海试结果,目标船分别为摩托艇和中型双体船,测距结果与精度为20 cm的差分GPS定位结果比较,表明“圆筛”和“动态滤波”相结合的后置处理方法,可显著改善测距效果。 

Experiment of passive ranging for three-sensor array in shallow sea and post processing

For improving passive ranging of three-sensor array,a sliding cross-correlator is adopted to improve the performance of time delay estimation.Compared with the traditional cross-correlator the sliding cross-correlator's ability is highly increased.An improved formula which is in high precision for near target is employed.An algorithm for kicking out wild value is presented,which is on line,can track automatically.The algorithm named "round filter" can pick out the data in high quality with robustness.A"dynamic filter"is presented,which is combined with the "round filter" as the post processor.The experimental result of three-sensor array passive ranging in shallow water and near field is introduced,which shows the post processor is indeed obvious in improving the ranging performance.