雷达景象匹配由于具有全天候的特征,在飞行器导航与定位中受到重视,但因为地形起伏影响,实际地物在雷达景象上的成像会发生变形与移位,这将影响实时雷达景象与参考基准图匹配的精度。根据实时雷达景象的成像方式,利用参考基准图模拟出地面平坦条件下的模拟雷达图一;并利用DEM数据,采用纠正方法,在该模拟雷达图上引入地面起伏因素的影响,得到地面起伏情况下的实际成像——模拟雷达图二。试验中,将同一地区的两类模拟雷达实时图分别与参考基准图影像进行匹配,比较匹配的结果,针对其匹配差异分析地面起伏对雷达景象匹配的实际影响,最后得出结论——实际地面在雷达图上的成像特征是影响匹配的最主要因素,地形起伏对匹配的影响与地面特征的分布有关,只有起伏区域存在明显地物特征时才会对匹配产生影响。

Radar image scene matching is an important means on navigation and location of aeroplane, due to its all-weather\nimaging capability. However, because of radar side looking and terrain undulation, the real objects distorts and displaceswhen\nradar scene is imaged. It impacts the matching precision between a radar image and the reference one. In this paper, based on\ntheway of scene imaging, the analogy real-radar image (image one) is made from reference image firstly. And the impact of\nterrain undulation is introduced into the real-radar image one by rectificationwith DEMdata. Then the real-radar image (image\ntwo) is produced, which containsthe impactofterrain undulation. Inthe experiment, twotypes ofthe analogyreal-radar images\nof the same area arematchedwiththe reference one.Thematchingresults are compared, andthe difference ofmatchingresult is\nused to analyze the practical influence ofterrain undulation on radar scene matching. At last, the article drawa conclusion———\nthe imaging characteristic of actual surface object is a main factor that affects matching, and the terrain undulations just have\ninfluenle on matching onlywhen it combined with object feature.