机载三线阵传感器影像区域网联合平差

机载三线阵扫描传感器飞行过程能够同步记录影像数据和POS数据。由于系统误差的存在,POS直接对地定位的精度还不能满足测制大比例尺地图的需要,因此,空中三角测量仍然是必须的。本文简述三线阵扫描传感器立体成像原理;在引入POS集成的传感器空间定位模型的基础上,建立机载三线阵传感器区域网联合平差的数学模型。平差试验结果表明,无论什么情况,区域网联合平差对提高机载三线阵传感器影像的定位精度都是必要的。

Combined Block Adjustment for Airborne Three-line CCDScanner Images

Airborne three-line CCD Scanner records image and POS data synchronously on fly,which is the hot spot of research these days.Linear arrays on the focal plane capture strips of imagery looking forwards,downwards and backwards from the aircraft.The entire ground surface is imaged three times,far superior to the 60% triple coverage in typical film-based aerial photography.Because of system error of POS a triangulation is required.The first,the imaging Principle of Three-line CCD Scanner has been introduced in this paper and Integrated Sensor Orientation model has been discussed.The second,the paper provides combined block adjustment math models based on Integrated Sensor Orientation model.The remaining misalignment is determined by the combined block adjustment because the axes of the IMU cannot be perfectly aligned with the axes of the sensor system.The offset between the GPS antenna centre and the projection centre must be estimated also.Finally,some conclusions are drawn after experiment results are analyzed.In any case,the Combined Block Adjustment is fully necessary for Airborne Three-line CCD Scanner images.