Necessity and implement method of precise assembling of TDI CCD in sweep aerial remote sensor
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摘要: 为保证全景式航空遥感器的成像质量,对其TDI CCD精密装调展开了研究.首先介绍了全景式航空遥感器及TDI CCD的工作原理;然后对TDI CCD时间延迟积分方向与摆扫像移方向夹角引起的TDI CCD调制传递函数的下降展开理论研究,计算结果表明全景式航空遥感器TDI CCD必须进行精密装调;最后给出了全景式航空遥感器TDI CCD精密装调的实现方法.装调结果表明,该方法可达到很高的装调精度,当级数为200级时,装调误差引起TDI CCD在乃奎斯特频率处的调制传递函数下降为0.999 9,完全满足全景式航空遥感器的使用要求.Abstract: In order to ensure the imaging quality of sweep aerial remote sensor, the precise assembling of TDI CCD is researched. Firstly, the working principle of sweep aerial remote sensor and TDI CCD is introduced. Secondly, degradation in the Modulation Transfer Function(MTF) of TDI CCD caused by the angle between TDI direction of TDI CCD and image motion in the direction of pendulum swing is discussed. And the calculated results demonstrate that precise assembling is indispensable to TDI CCD in sweep aerial remote sensor. Finally, the method of precise assembling of TDI CCD in sweep aerial remote sensor is provided. The assembling and adjusting results show that the assembled method of TDI CCD can give very high precision, and the MTF at Nyquist frequency of TDI CCD caused by the assembling error is 0.999 9, when the stages of TDI CCD are 200.
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