卫星摄影测量LMCCD相机的建议

Proposal to Use LMCCD Camera for Satellite Photogrammetry

建议在平行排列的三线阵CCD相机的正视阵列上下端两侧各附加一个128×128像元小面阵CCD,构成线阵、面阵混合配置的相机。卫星推扫摄影时,每经历(ftanα/10)/pixel时间(取样周期),附带记录小面阵影像。采用"等效框幅"(equivalenceframephoto并简写为EFP)[1]光束法平差,应用三线阵CCD影像及小面阵影像,实现了单航线四控点(航线首末端四角隅各一个控制点)空中三角测量,取得与相同参数的框幅像片平差相当的结果。而且平差精度受卫星飞行姿态变化率影响甚微。采用与MOMS 02/D2相类似的参数进行数值模拟计算,给出了B≥2航线空中三角测量精度统计,说明了LMCCD相机影像空中三角测量的效能。以上f=正视相机主距,α=前视光线、后视光线与正视光线的夹角,B=正视影像投影中心与前、后视影像投影中心距离。

Using the LMCCD camera for satellite photogrammetry is suggested. The LMCCD camera is formed via appending four small matrix CCDs (128×128 pixels) to each side of both ends at the nadir view line array in the three-line array CCD camera. When the camera is photographing by bush broom mode, the images of the small matrix CCDs will be recorded according to the sampling period ((ftan α/10)/pixel). In bundle adjustment by the method of so-called equivalence frame photo (EFP), use the two types CCD image, and carry out the aerial triangulation of single strip, that only use four control points in the corners of the strip. The result of the adjustment is similar to the frame photos that have the same parameters and the influence of the rate of satellite flying attitude on the accuracy of adjustment is slight. The parameters that is similar to the MOMS-02/D2 is adopted for the simulations, and the accuracy statistics of the aerial triangulation of single strip (B≥2) is offered , that explained what is efficiency of image obtained by the LMCCD camera for the aerial triangulation.Wheref=Focal length of the nadir view lensα=Convergence angle between the nadir view ray and forward view or backward viewB=Base length Between forward (or backward)/nadir look