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飞行器一边飞行,一边不断测出下方地面的海拔高度或飞行器与地面间的高程差,和已知的基准地形图比较,从而确定飞行器的位置,这就是地形轮廓匹配定位问题。本文给出了根据测高数据进行后验概率密度递推的基本公式,由此简化得到的几个具体算法,经计算机在实际地形图上仿真表明,具有递推执行,截获概率和定位精度较高,可用于任意飞行航迹和不等间隔测高,可对付较严重的随机扰动、航速误差和航向偏差等特点。
While flying, the altitude of the ground beneath the ground or the elevation difference between the ground and the ground is constantly measured and compared with the known reference topographic map to determine the position of the aircraft. This is the topography contour matching positioning problem. In this paper, the basic formula of recursive probability density of a posteriori is given based on the altimeter data. Several specific algorithms are simplified. The computer simulation on the actual topographic map shows that the recursion with the recursive probability, High, can be used for any flight path and unequal interval altimetry, can deal with more serious random disturbance, speed error and heading deviation and so on.