Attitude estimation using a remote sensing sensor with parallax

精确的航天器姿态估计是提供良好的遥感图像几何性能的主要要求，ASTER/SWIR子系统有6个并行排列的线阵传感器，每条线扫描同一地面目标，相邻波段之间的时间间隔为356.238 ms。当观测之间的时间间隔内出现姿态波动时，频段间的配准性能变得更差。由于行扫描的时间分辨率高于卫星提供的姿态信息的时间分辨率，因此对姿态数据进行高频估计。利用修正后的姿态信息对图像配准误差进行了校正，结果表明，航天器姿态抖动引起的02个像素的图像失真小于0.08个像素，表明视差观测传感器的带内配准误差可以有效地改善姿态起伏引起的图像失真。该技术适用于EO-1/ALI、FORMOSAT-2和SELENE/LISM等焦平面上具有相同平行构型的观测传感器。

Accurate attitude estimation of spacecrafts is the main requirement to provide good geometric performance of remote sensing imagery The ASTER/SWIR subsystem has six linear-array sensors arranged in parallel and each line scans the same ground target with a time interval of 356.238 ms between the neighboring bands. The registration performance between bands becomes worse when attitude fluctuation occurs during a time lag between the observations. Since the time resolution of line scan is higher than that of the attitude information provided from the satellite, attitude data are estimated with high frequency. We succeeded in correcting the image registration error using the revised attitude information As a result, the image distortion of 02 pixels caused by spacecraft attitude jitter is reduced to less than 0.08 pixels, showing that band-toband registration errors of a sensor with parallax observation are available to improve the image distortion caused by attitude fluctuation This technique is applicable to an observation sensor with the same parallel configuration on the focal plane, such as EO-1/ALI, FORMOSAT-2 and SELENE/LISM.