对某城区一对1：8000航摄立体数字影像利用Intergraph数字摄影测量工作站上的立体量测软件IS-DM进行手工量测，然后通过用自行开发的GPS辅助光束法区域网平差软件WuCAPSGPS的单模型光束法平差精确测定了18个加密点的位置。经过对数字影像采用1到100不同质量因子的JPEG压缩，获得一组质量各异的压缩影像，从分析重建影像点定位结果的变化入手，探讨了JPEG压缩对摄影测量点定位精度的影响。试验表明：失真JPEG压缩对摄影测量点定位精度的影响是显著的。随着压缩比的增大，影像可视化质量逐渐衰减，像点量测精度不断降低，加密点位精度几乎呈线性趋势下降，且高程比平面衰减的速度要快得多。

简要介绍了以航线为单元，通过相位平滑递推算法在航求解双差载波相位观测量整周相位模糊度，进而确定各摄站空间位置的无初始化GPS动态定位原理，对某测区一组实际航摄资料进行GPS数据处理和GPS辅助光束法区域网平差，证实所介绍的算法是正确的、有效的，所获取的GPS摄站坐标可满足空中三角测量的精度要求，并且用该数据与经初始化GPS动态定位获取的GPS摄站坐标数据进行GPS辅助光束法区域网平差的总体精度是完全一致的。

从单线阵推扫式传感器的成像机理出发，利用6个卫星轨道开普勒参数和3个传感器姿态角建立了推扫式卫星遥感影像坐标与其地面点在地心坐标系下的坐标关系式，即构像方程。按照所建立的构像方程，对某地区一景SPOT25影像进行对地目标定位，获得了实地上83.392m的平面精度；利用单个地面控制点对卫星轨道开普勒参数和传感器姿态实施调整后，目标定位精度提高到14.217m。试验证实，所建立的构像方程是正确的，在卫星遥感对地目标定位中有较好的应用前景。

本文简要介绍了GPS辅助光束法区域网的基本原理和方法，详细讨论了太原航摄机动态试验场实际GPS航摄飞行试验的结果。利用联合平差程序WuCAPS系统时对试验区进行GPS辅助光束法区域网平差，用分米级精度的GPS摄站坐标获得了实地上平面为士7.9cm、高程为士18.1era的加密精度，充分显示了动态GPS定位技术在航空遥感定位中的广阔应用前景。

In conventional aerial photogrammetry, high precision photogrammetric point determination is always carried out by aerotriangulation using a great deal of ground control points around the perimeter and in the center of a block area because the exterior orientation parameters of aerial photographs are unknown. A technological revolution in photogrammetry has taken place since Navstar Global Positioning System (GPS) was applied to determine the 3D coordinates of exposure station positions during the photo flight missions. GPS-supported aerotriangulation is conducted by a combined bundle adjustment wth GPS navigation data, which replaces the essential ground control points with GPS-determined camera positions. The simulation experiments of GPS-supported aerotriangulation can date back at least to 1986. Recent investigations show this method is now practical. We have been engaged in theoretical studies, software development, and related to experiments and production on the field since 1990. So far, most-abundant research achievements are obtained in terms of the theory and application. In this paper, we first derive the mathematical model of combined bundle adjustment with GPS navigation data from the geometry between camera and airbrone GPS antenna, and then describes briefly a software package WuCAPS (Wuhan Combined Adjustment Program System) developed by the author, which serves the purpose of combined bundle adjustment for photogrammetric and non-photogrammetric observations. At the end of the present work,a set of actual aerial photographs, at an image scale of 1:34,000, with airborne GPS data taken fromTianjing site in China were processed by our WuCAPS. The empirical results have verified that theaccuracy of the combined bundle adjustment with 4 XYZ ground control points around the corners of block area is very closed to that of the conventional bundle adjustment with 3 additional parameters, which leads to an 88% reduction in field survey and 75% saving in production cost, and can meet the specification of topographic mapping at small or medium scale by GPS-supported aerotriangulation without ground control. This shows the ample applicability and the economic benefit of kinematic GPS relative positioning in high accurate photogrammetric point determination.