地形跟踪制导中数字表面模型的研究

分析研究了数字表面模型(DSM)在飞行器地形跟踪制导中的应用，提出了一种大地坐标下和高斯坐标下DSM建模的新方法。在此基础上分析了DSM模型纵横断面采样间距对孤立障碍物的影响，分析定义了DSM模型下飞行器掠地飞行的最小安全高度。仿真试验表明，在地形跟踪制导技术中采用数字表面模型DSM比采用数字高程模型DEM有更强的制导适应性。

Research on a digital surface model for terrain following guidance

Topographical rise and fall from mean sea-level datum to ground can be expressed using digital elevation model(DEM),but this model can not be used to describe the feature variation of terrain surface efficiently,and has some deficiency in the application of precise terrain auxiliary navigation(PTAN).a study of the application of a digital surface model(DSM) to terrain following guidance of flying vehicle is carried out,and a new constructing approach of digital surface model under the geodesic coordinate and Guassian coordinate is proposed with digital photogrammetry.On the basis of the DSM,the effects of the sampling interval of DSM's vertical and cross section on the isolated obstacles are analyzed,and the lowest flying safe height over DSM is given.It is shown from the simulation results that DSM model is more adaptability than DEM model in the terrain following guidance technique.