星载TDICCD相机像移对成像质量的影响分析

Analysis of Image Motion Effect on Satellite TDICCD Camera Image Quality

通过分析给出了偏流角变化、速高比变化和姿态精度导致的像移量及其与调制传递函数的对应关系,结合卫星轨道和相机参数,在不同积分级数下引起的像移对相机成像质量的影响进行了仿真。结果表明,随着积分级数的增加,像移对相机成像质量的影响越来越大,尤其表现为偏流角及速高比的变化。为此,在轨运行期间须对其采取补偿措施,为保证高质量的图像,卫星平台必须具有高精度、高稳定度的姿态控制系统。

The modulation transform functions of a camera are established vs.the abnormal image motion due to the changes of drift angle and velocity-height ratio,and the attitude accuracy.The effects of the image motion caused by them on the image quality for different integral numbers are calculated and simulated for a given orbit and camera.The results show that the effects of the image motion on the image quality become greater with the increase of the integral number,especially the changes of drift angel and velocity-height ratio,so the compensation of them in-orbit should be adopted and the high attitude accuracy of attitude control is needed for high image quality.