利用PICS导航数据进行独立模型法区域网联合平差的研究

COMBINED BLOCK ADJUSTMENT WITH INDEPENDENTMODELS USING PICS NAVIGATION SYSTEM DATA

用PICS导航系统所记录的摄站坐标作控制点，进行独立模型法区域网联合平差，用二次多项式作摄站坐标控制方程式中的附加参数，以消除导航定位数据中的系统误差。研究分三个阶段进行。首先，用带有各种误差的模拟数据进行平差方法试验；然后，用真区域网进行稠密地面控制加密并分析PICS记录坐标的精度；最后，用PICS导航数据和稀疏布设的地面控制点进行了区域网联合平差。本文介绍的研究结果表明，摄站坐标随机误差对区域网加密精度的影响，平面元素存在跳跃而失去其使用价值，而PICS的摄站高程坐标可减少大量的高程控制点，加密精度能满足中、小比例尺加密的要求。

The projection centre coordinates of aerial photographs recorded by PICS navigation system were utilized as the control points in combined block adjustment with indepen- dent models. Additional parameters of polynomical second order were added in their equations for compensation systernatic errors of the navigation data. Three stages were separated in this investigation. Firstly. combined block adjust- ment were completed using simulated block data with series of random afld systematic errors. Secondly. precisions of PICS's coordinates were obtained utilizing aerial triangu- lation of a test area with full ground control points. Finally. combined block adjustment were carried out with the PICS's projection centres of photographs and a few ground points for coutrol points. The results had shown that the llorizontal elements of PICS's data were useless for its great and unstable random errors. however its vertical coordi- nates could reduce a great deal of the ground vertical control points and the find accu- racies of densification could fit the reguirement of mapping of the medium scale.