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对遥感卫星TDI-CCD推扫品字形探测器偏流角的补偿进行了研究。根据偏流角产生机理,用轨道要素法推导出一种简单可靠的偏流角计算和补偿方法,将偏流角补偿后重新计算的欧拉角作为控制目标输入闭环进行控制,规避了三轴欧拉角转序的影响。分析了偏流角控制对品字形拼接探测器成像产生的像元错位、调制传递函数(MTF)、通道间配准和幅宽等的影响。结果发现:对偏流角进行控制后穿轨向像元错位可消除,沿轨纵向像元错位不能消除,穿轨和沿轨向MTF均可消除,偏流角可对幅宽无影响;不对偏流角进行控制会严重影响通道间的配准精度。所提方法计算简单,流程清晰,在工程中有一定的应用价值。
The compensation of drift angle of remote sensing satellite TDI-CCD push-pull glyph detector was studied. According to the generating mechanism of drift angle, a simple and reliable method of calculating and compensating the drift angle is derived by using the orbital element method. The Euler angle recalculated after compensating the drift angle is controlled as the input closed-loop of the control target to avoid the three-axis Euler angles Effect of rotation. The influence of drift angle control on pixel misalignment, modulation transfer function (MTF), inter-channel registration and width, etc. The results show that the dislocation of traversing pixel can be eliminated after the drift angle is controlled, the dislocation of pixels along the track can not be eliminated, and the MTF can be eliminated both along the track and along the track. The drift angle can have no effect on the width. Controlling can seriously affect the registration accuracy between channels. The proposed method is simple, clear process, in the project has a certain value.