中文摘要：

采用模拟分析的实验方法，首先通过给出实验所使用的数学模型，以SPOT影像数据所提供的外方位元素数据为模拟对象进行模拟分析．最后选用40个地面检测点，通过其在全球定位和惯性导航系统（GPS／INS）不同精度条件下地面点位变化来分析最终的模拟结果．模拟结果表明，姿态角误差在点位误差中起主要作用．并且p角在x方向误差影响最大，m角在y方向上误差的影响最大，当考虑点位误差时，＊的影响最小．而数字高程模型（digital elevation model，DEM）误差对y方向比对x方向的误差影响要大．

英文摘要：

This paper presents an approach based on simulated data of the external orientation deriving from SPOT data and describes the mathematical formulation of the model. The ground coordinates of 40 ground control points are available and used as check data for the results＇ analysis under different accuracy level for global positioning system and inertial navigation systems （GPS/INS）. It can be observed that for the fixed error in exposure centre, the increase in attitude error brings more significant change to the ground position error than an increasing error in exposure centre with fixed error in attitude doses. And error in φ plays a more important role in ground point error in X, while has greater effect on ground point error in Y than others. Under the consideration of point positioning accuracy, the influence of κ is the least. Moreover, the increasing error in digital elevation model （DEM） has greater influence on positioning error in Y than in X.