摘要
重力辅助导航在数字重力图的不同区域,其匹配效果各不相同。为了评价数字重力图各区域的重力匹配效果,给路径规划提供可靠的依据,在对地球重力场的各种特征参数进行归一化处理并且分类统计分析的基础上,运用层次分析法将重力场的局部标准差、经度方向粗糙度、纬度方向粗糙度、经度方向坡度、相关系数进行组合,给出一种新的重力匹配区域选择准则,依据此准则将数字重力图划分为重力匹配的适配区和非适配区。在数字重力图上采用均方差(MAD)和平均绝对差(MSD)算法进行重力辅助导航的重力匹配仿真计算和比较,仿真结果表明,适配区域的匹配导航效果明显优于非适配区域,定位误差小于一个重力格网。
The gravity matching results are different in different regions of digital gravity map.The well matched regions in gravity map can provide a reliable basis for path planning.In this paper,the gravity field＇s local standard deviation,longitude roughness,latitude roughness,longitude slope and relevant coefficient were integrated with the analytic hierarchy process method based on the normalization and classification statistics.Then a new selection criterion of gravity matching was proposed to determine the good matching regions and bad matching regions for the gravity aided inertial navigation system.The simulation results with MAD and MSD algorithms show that the navigation errors in good matching regions are less than a gravity grid,which is much better than those in non-matching region.
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2013年第1期93-96,共4页
Journal of Chinese Inertial Technology
基金
国家高技术研究发展计划(863计划)(2011AA060506)
关键词
重力
组合导航
层次分析法
重力匹配准则
gravity
integrated navigation
analytic hierarchy process method
gravity matching criterion
