利用多光谱影像检测资源三号卫星平台震颤

卫星平台震颤是影响高分辨率卫星成像质量的因素之一,会引起影像模糊和内部畸变。本文从资源三号卫星多光谱相机的成像特点和多光谱影像配准误差影响因素入手,理论推导和仿真分析了卫星平台震颤对配准误差的影响规律,在此基础上提出了基于多光谱影像高精度密集匹配的平台震颤检测方法和流程,最后利用不同波段、不同时间的成像数据进行试验。试验结果表明资源三号卫星在试验数据成像阶段存在约0.6Hz的平台震颤,且垂轨方向震颤幅值大于沿轨方向,同时引起波段间相同频率周期性配准误差。检测结果为进一步提高资源三号处理精度提供了可能,也为卫星平台震颤源的分析和优化卫星平台设计提供了重要参考依据。

Detection of ZY-3 Satellite Platform Jitter Using Multi-spectral Imagery

Satellite platform jitter is one of the factors that affect the quality of high resolution imagery, which can cause image blur and internal distortion.Taking ZiYuan‐3 (ZY‐3)multi‐spectral camera as a prototype,this paper proposes a satellite platform jitter detection method by utilizing multi‐spectral imagery.First,imaging characteristics of multispectral camera and the main factors affecting band‐to‐band registration error are introduced.Then the regularity of registration error caused by platform jitter is analyzed by theoretical derivation and simulation.Meanwhile,the platform jitter detection method based on high accuracy dense points matching is presented.Finally,the experiments were conducted by using ZY‐3 multi‐spectral imagery captured in different time.The result indicates that ZY‐3 has a periodic platform jitter about 0.6 Hz in the imaging period of test data,and the jitter amplitude across track is greater than that along track,which causes periodic band‐to‐band registration error with the same frequency.The result shows the possibility of the improvement in geometric processing accuracy for ZY‐3 imagery products and provides an important reference for satellite platform jitter source analysis and satellite platform design optimization.