地磁特征对匹配算法性能的影响分析

Effect Analysis of Geomagnetic Characteristic on the Performance of Matching Algorithm

地磁匹配区的选择是影响地磁匹配系统性能的重要因素,而选择准则直接决定了匹配区的适配性以及匹配制导的可靠性和精度.为此,文中从地磁标准差、地磁粗糙度、地磁相关长度、地磁梯度标准差4个参数着手,以某一匹配区中9条不同航迹的仿真匹配试验结果作为研究样本,对比分析了各条航迹的不同地磁特征对匹配算法性能的影响.研究结果表明,各条航迹上的地磁梯度标准差与匹配概率之间存在较为明显的正比关系,可将地磁场梯度标准差作为地磁匹配区的选取准则,对载体航迹进行规划.

The selection of matching area is an important element for the performance of the geomag- netic matching system, and the selection criteria determines the reliability and precision of matching guidance. In this paper the effects of geomagnetic characteristic parameters such as standard devia- tion, roughness, correlation length and gradient standard deviation on matching algorithm perform- ance are analyzed comparatively based on the simulation results of nine different tracks in selected are- as that are done by using the proposed method. The study results show that there is significant posi- tive relationship between the gradient standard deviation and the matching probability on each track, so the geomagnetic gradient standard deviation can be used as selection criteria for matching region in geomagnetism navigation and plan the carrier flight path.