超大像元TDICCD的时序设计与优化  

Design and Optimization of the Timing Sequence for TDICCD with Super-large Pixels

作　　者：曹伟[1] 于正阳[1] 李映宝 李玲月 万旻[1] 杨亭[1] CAO Wei;YU Zhengyang;LI Yingbao;LI Lingyue;WAN Min;YANG Ting(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《航天返回与遥感》2025年第2期63-71,共9页Spacecraft Recovery & Remote Sensing

摘　　要：为解决水平方向均匀细分求和时序下成像电路系统信噪比和级数线性度不满足相机指标要求的问题,文章在分析超大像元TDICCD特点和工作原理的基础上,提出一种水平方向非均匀细分求和时序设计方案。该方案从加长模拟信号复位参考保持时间,减少中间电荷包收集时间、加长最后电荷包收集时间等3个方面进行时序优化和软件设计,使得相关双采样的前后采样区域分别增大了3倍和1.7倍以上,提高了采样可靠性,并完成了成像电路系统的硬件设计和性能测试验证。实验室测试结果显示,超大像元TDICCD所有谱段的信噪比均大于67 dB,级数线性度均优于99%,满足相机指标要求;同时,在轨图像纹理清晰,谱段层次分明,该方案的有效性进一步得到了应用验证。To address the problem that the signal-to-noise ratio and stage linearity of the imaging circuit system under the horizontal uniform subdivision and summation timing do not meet the requirements of the camera specifications,based on the analysis of the characteristics and working principle of the ultra-large pixel TDICCD,this article proposes a design scheme for the horizontal non-uniform subdivision and summation timing.This scheme conducts timing optimization and software design from three aspects:extending the reset reference holding time of the analog signal,reducing the collection time of the intermediate charge packet,and extending the collection time of the last charge packet.As a result,the pre-sampling and post-sampling regions of the correlated double sampling are increased by more than 3 times and 1.7 times respectively,improving the sampling reliability.Moreover,the hardware design and performance test verification of the imaging circuit system are completed.The laboratory test results show that the signal-to-noise ratio in all spectral bands of the ultra-large pixel TDICCD is greater than 67 dB,and the stage linearity is better than 99%,meeting the requirements of the camera specifications.Meanwhile,the texture of the on-orbit images is clear,and the spectral bands have distinct layers,further verifying the application of this scheme.

关 键 词：超大像元 相关双采样 细分求和 TDICCD 时序 航天遥感 

分 类 号：V474[航空宇航科学与技术—飞行器设计]