高分辨率机载SAR影像空中三角测量模型

Highresolution airborne SAR aerial triangulation model

目前,我国西部地区近2000000km2的国土面积还缺乏相应比例尺的地形图,由于西部多云多雾天气条件的限制,采用高分辨率机载SAR遥感影像成为遥感技术测图实施中的重要数据源之一。同时,为了减少地面控制点的外业测量工作,研究如何获取足够数量及精度的控制点也成为当务之急。本文分析了高分辨率机载SAR影像空三应用的条件,并在测区稀少控制点的条件下,讨论DGPS/INS辅助机载SAR影像空三向量模型以及相应的数据处理方法,为机载SAR影像获取地面控制点的实际应用提供理论依据。

Presently, almost 2000000 square kilometers of western area in China has still lacked of corresponding relief maps. While remote sensing cartography technique being performed, the high resolution airborne SAR imagery has often been chose as one kind of important data resources, because of the cloudy or rainy mountainous conditions in these districts.At the same time, the mission that how to acquire enough ground control points (GCPs), aiming to reduce measuring work of mapping GCPs, has become an urgent demand. This paper analyzes the practical conditions, and analyses the instance with navigation data provided from GPS/INS system. With only sparse GCPs around the mapping area available, it puts forward the corresponding vector model, and sequent technique flow of airborne SAR triangulation, with which we can obtain the coordinates of the required GCPs for cartography, accordingly.