推扫式高光谱传感器集成的POS系统视准轴及位置偏差检校

Boresight Misalignment and Position Offset Calibration of Push-broom Hyperspectral Sensor Integrated POS System

摘要: 推扫式高光谱传感器与其集成的定位定向系统(简称为POS系统)间的视准轴偏差是其影像直接对地目标定位的主要误差源之一。由于垂直下视推扫式高光谱影像连接点间构网强度较弱,不能够进行严密的光束法平差检校,本文将POS系统解算的外方位元素作为只含有系统误差的观测值,建立视准轴和位置偏差简单的光束法平差检校模型。实验结果表明,该检校模型可靠有效,实验区经检校后的直接对地目标定位精度显著提高,其平面中误差约1.4m(约4个像元),高程中误差约4.4m(约13像元)。

Abstract: Boresight misalignment between a hyperspectral sensor and intergrated POS system is a key error source in image direct georeferecing(DG).Due to the poor intensity of tie/pass points nets of a nadir push-broom hyperspectral image,a rigorous bundle adjustment cannot be implemented for calibration.To solve this problem,this paper develops a simple boresight misalignment and position offset bundle adjustment calibration model using the exterior orientation elements solved by POS system with only systematic errors.Test results showed that this calibration model is sound and effective.The direct georeferencing precision with this calibration is improved significantly,with a standard deviation of approximately 1.4m(about 4 pixels) at planimetry and 4.4m(about 13 pixels) at the height in the test area.