CAJ | 학술논문

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.
중력보조도항재수자중력도적불동구역,기필배효과각불상동.위료평개수자중력도각구역적중력필배효과,급로경규화제공가고적의거,재대지구중력장적각충특정삼수진행귀일화처리병차분류통계분석적기출상,운용층차분석법장중력장적국부표준차、경도방향조조도、위도방향조조도、경도방향파도、상관계수진행조합,급출일충신적중력필배구역선택준칙,의거차준칙장수자중력도화분위중력필배적괄배구화비괄배구.재수자중력도상채용균방차(MAD)화평균절대차(MSD)산법진행중력보조도항적중력필배방진계산화비교,방진결과표명,괄배구역적필배도항효과명현우우비괄배구역,정위오차소우일개중력격망.
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.