矢量水听器双潜标系统纯方位定位精度分析

Analysis of location precision when using a dual subsurface-buoy system with a vector hydrophone

为了对基于矢量水听器的双潜标系统的定位精度进行分析,从纯方位被动定位系统原理入手,推导了此类条件下定位误差的几何稀释度的具体数学表达式.结合矢量水听器及潜标的应用条件,给出了仿真参数的选取依据.研究了系统基线长度、测向误差及站址误差对定位精度的影响.计算机仿真及数学分析表明,增大基线长度可以提高系统定位精度,较小的测向误差会引起较大的定位误差,站址误差所引起的定位误差大于站址误差本身且存在最小值,其值是站址误差的2倍.该研究为潜标系统的实际应用提供了重要的参考依据.

In order to analyze the precision of locations determined by the dual subsurface-buoy system when using vector hydrophones,mathematical expressions for the geometrical dilution of precision were derived starting with the principles appropriate for a bearings-only passive positioning system.These were combined with the conditions suitable for the application of vector hydrophones and subsurface-buoys so that simulation parameters could be selected.The impacts of base length,directional errors and station positional errors on positioning accuracy were studied.Computer simulations and mathematical analysis showed that positional accuracy can be improved by increasing the base length.Even a small directional error caused very large positional errors and the location errors caused by station positional errors have a minimum value which is larger than the station positional error itself.The mininum value of location errors caused by station position error is √2 times of the station poision error.The result of this study can provide an important reference for practical applications of the subsurface-buoy system.