TDICCD交错拼接的精度检测

Precision measurement of TDICCD interleaving assembly

焦平面组件是遥感相机的重要组成部分,TDICCD的交错拼接可以获得大尺寸的焦平面。由于TDICCD交错拼接的焦面长度一般较长,常规的检测方法很难获得准确的检测结果。本文采用对拼接TDICCD像元直接监测的方法,使用直线度<2μm/m的气浮导轨,搭载显微系统对像元进行空间位置检测,并对已经完成拼接的600 mm长焦平面进行了精度检测,得到的检测误差<3μm。对遥感相机地面成像试验所得到的图像的分析表明,图像反映的拼接精度与检测所得到的结果吻合,从而验证了检测结果的准确性及检测方法的可行性,实现了长焦平面的高精度检测。

A noise model of TDICCD camera system was developed, the generated mechanism of read reset noise of TDICCD video signal was analyzed and the principle of Correlated Double Sampling （CDS） technique for high S/N （signal to noise ratio） and excellent imaging of TDICCD camera were discussed also. Each part of the video processing circuit was analyzed and the design methods were presented. The scientific grade TDICCD camera was designed according to analyzed results. Experimental results show that the designed circuit can effectively suppress dark current noise, reset noise and 1/f noise. The output S/N of TDICCD camera can exceed 50 dB when the data rate is 55 MHz.