CAJ | 학술논문

文中通过对高分辨相机静态传函测试中误差产生的机理进行分析，提出了相应的测试策略，有效抑制条纹靶标周期偏差、环境振动及图像噪声对MTF的影响。TDI CCD相机的MTF测试值受到条纹靶标周期偏差、环境振动和图像噪声的影响，通过分析上述因素对MTF测量值的影响机理，建立了条纹靶标周期偏差、环境振动和图像噪声对传函的影响模型，并分别提出了针对条纹靶标周期偏差引入的MTF测量值修正方法，以及针对噪声影响提出了MTF计算模板的最优化选取算法，通过最优化模板计算得到的MTF测量值可以有效抑制图像噪声的影响，同时抑制环境振动以及条纹靶标周期偏差引起的摩尔条纹对MTF测量值的影响。根据对某空间相机实测图像的分析结果，横向模板尺度应不大于摩尔条纹横向周期的4%，纵向模板的尺度应不大于摩尔条纹纵向周期的2%，分析表明模板越大，MTF受噪声影响越小，但受环境振动和条纹靶标周期偏差影响越大，实际工程中应结合相机本身的噪声水平，在最优区间选取MTF计算模板，使得测量值更准确。
문중통과대고분변상궤정태전함측시중오차산생적궤리진행분석，제출료상응적측시책략，유효억제조문파표주기편차、배경진동급도상조성대MTF적영향。TDI CCD상궤적MTF측시치수도조문파표주기편차、배경진동화도상조성적영향，통과분석상술인소대MTF측량치적영향궤리，건립료조문파표주기편차、배경진동화도상조성대전함적영향모형，병분별제출료침대조문파표주기편차인입적MTF측량치수정방법，이급침대조성영향제출료MTF계산모판적최우화선취산법，통과최우화모판계산득도적MTF측량치가이유효억제도상조성적영향，동시억제배경진동이급조문파표주기편차인기적마이조문대MTF측량치적영향。근거대모공간상궤실측도상적분석결과，횡향모판척도응불대우마이조문횡향주기적4%，종향모판적척도응불대우마이조문종향주기적2%，분석표명모판월대，MTF수조성영향월소，단수배경진동화조문파표주기편차영향월대，실제공정중응결합상궤본신적조성수평，재최우구간선취MTF계산모판，사득측량치경준학。
The Methods was proposed based on the analysis of Modulation Transfer Function (MTF) test error of spaceborne TDI CCD camera, the influence from grating period error, environment vibration and imaging noise was retained from MTF testing. The MTF testing is affected by grating period error, environment vibration and imaging noise. Through analyzing the influence mechanism, a mathematic module was established to describe the influence of grating period error, environment vibration and imaging noise. The correcting algorithm of the testing MTF error from grating period error was proposed, and the optimization mask of MTF testing was also proposed to reduce the influence from image noise. Based on the testing images, the horizontal scale of MTF mask should not exceed 4% of the Morie fringe horizontal period, the vertical scale of MTF mask should not exceed 2% of the Morie fringe vertical period. The analysis shows that if the mask is larger, the influence from noise is reduced, but the influences from the environment vibration and grating period error will increase. In the real project, the mask scale should be selected based on the imaging system noise level, and ensure the accuracy of the MTF testing.