星载DTDI系统全链路成像质量影响因素分析  

End-to-end Anlysis of Image Quality for Satellite-Based Digital TDI Imaging

作　　者：庄绪霞[1,2] 魏久哲 贺金平 ZHUANG Xuxia;WEI Jiuzhe;HE Jinping(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;Beijing Key Laboratory of Advanced Optical Remote Sensing Technology,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094 [2]先进光学遥感技术北京市重点实验室,北京100094

出　　处：《航天返回与遥感》2025年第1期60-72,共13页Spacecraft Recovery & Remote Sensing

摘　　要：为实现星载数字时间延迟积分(Digital Time Integration Delay,DTDI)系统的有效设计与成像质量分析,文章提出星载DTDI系统全链路成像质量影响因素分析方法。首先,分析了技术的原理和影响因素,在此基础上构建了场景-大气-星载系统-处理的全链路DTDI成像系统仿真模型,开展了多要素影响下的DTDI成像仿真试验与分析评价。结果表明:0.9 m分辨率下,积分时间0.063 ms、量化位数12 bit、TDI级数6级可以获得较好的成像质量,利用DTDI技术可将平台稳定度要求降至0.1(°)/s。文章研究成果可为星载DTDI系统设计分析提供参考。For the effective design and image quality analysis of spaceborne digital TDI systems,a method for analyzing the factors affecting the entire link image quality of spaceborne digital TDI systems is proposed.The principles and influencing factors of spaceborne digital TDI technology are analyzed,an end-to-end simulation model considering all the stages including scenario,atmosphere,spaceborne system and processing algortithm of the digital TDI imaging system is constructed,and digital TDI imaging simulations and analysis evaluations under the influence of multiple factors are carried out.The results show that at a resolution of 0.9 m,with an exposure time of 0.063 ms,a quantization bit of 12 bit,and a TDI level of 6,good image quality can be obtained.The use of digital TDI technology can relieve the platform stabilty requirement to 0.1(°)/s.This study can provide some reference for the design and analysis of spaceborne digital TDI system.

关 键 词：星载 数字时间延迟积分 全链路仿真 信噪比 计算处理 成像质量评价 

分 类 号：V445.8[航空宇航科学与技术—飞行器设计]