根据机载光电平台的特点, 建立了6个坐标系统, 进行了8次线性变换, 构建了从光电平台成像系统像面坐标系到大地地理坐标系的目标定位数学模型。计算了目标在大地地理坐标系的经纬度和高程坐标, 分析了各种测量参数对目标定位精度的影响。通过建立误差模型和仿真数据进行目标定位实验,采用蒙特卡罗方法统计目标定位误差。实验结果表明,载机经纬度误差、载机姿态角度误差及光电平台指向角度误差是影响目标定位精度的主要因素,其中载机经纬度误差直接传递到目标定位误差, 载机姿态角度误差和光电平台指向角度误差大体上以10-4~10-2比例作用到目标定位误差。本文方法有效可行, 对机载光电平台目标定位具有实用价值。

On the basis of the characteristics of an airborne electro-optical platform, six coordinate systems were established and eight linear coordinate transformations were performed. A coordinate transformation model from a camera sensor plane to geodetic coordinate systems was established by using linear coordinate transformation, and the computation formula of geodetic coordinate of the target was derived based on the transformation of different coordinates. The influence of target localization due to various error factors was discussed, and the localization error was analyzed with Mont Carlo method. The experimental results show that the target location is affected by aircraft position errors, aircraft attitude errors and EO platform pose errors, among which the aircraft position errors are transferred directly into the target location, and the aircraft attitude errors and EO platform pose errors are tranferred scaling with the range of 10-4~10-2 to the target location. This method is efficient and useful to the localization of targets for airborne EO platforms.