【作者】 张怀伟；

【导师】 余安喜；

【作者基本信息】 国防科学技术大学 ， 信息与通信工程， 2010， 硕士

【摘要】 分布式星载合成孔径雷达(SAR)是将卫星编队和星载SAR技术有机结合的新体制航天雷达系统。它通过多颗卫星编队飞行、协同工作,可实现地面运动目标指示(GMTI)功能,为地表大面积监视、侦察和目标跟踪、定位提供了可能。该类系统具有重要的军事和民用价值,是目前国内外研究的热点。如何客观有效地分析和评价分布式卫星SAR-GMTI系统性能,是系统设计的关键问题之一。在分布式卫星SAR-GMTI系统设计阶段,需要结合理论分析与系统仿真两种手段来分析和评价系统性能。本文正是围绕这一关键问题,针对分布式卫星SAR-GMTI系统性能分析与仿真实现技术展开研究。首先,研究了分布式卫星SAR-GMTI工作原理,针对两种常用处理技术——SAR-ATI和SAR-DPCA方法,梳理了SAR-GMTI系统性能的主要影响因素,给出了它们对系统性能指标的影响分析。然后,基于编队卫星轨道模型、三维场景地杂波信号模型及动目标信号模型,研究了分布式卫星SAR-GMTI仿真建模与实现技术,提出了一种分布式卫星SAR-GMTI系统性能评估方法,结合仿真试验验证了评估方法的有效性,与课题组其他人员一起研发了一套分布式卫星SAR-GMTI系统仿真软件,给出了完整的系统仿真流程。最后,应用分布式卫星SAR-GMTI系统仿真软件及性能评估方法,在不同情形的系统误差输入条件下开展了多层次的分布式卫星SAR-GMTI系统性能仿真试验,验证了性能评估结果与理论性能分析结果的一致性。更多还原

【Abstract】 Distributed spaceborne SAR system is a novel spaceborne radar system which combine satellite formation flying technology and spaceborne SAR technology perfectly. By formation flying and cooperation of several satellites, the system can realize Ground Moving Target Indication (GMTI) designation function. GMTI of distributed spaceborne SAR system gives the opportunity for large scale surveillance, spying, target tracking and position. Because of its special value for military and civil application, the distributed spaceborne SAR system is currently one of the research focuses all around the world.One of the key problems of the system design is how to analyze and evaluate the distributed satellite SAR-GMTI system performance objectively and effectively. In the period of distributed satellite SAR-GMTI system design, it needs to combine theoretical analysis and system simulation for analyzing and evaluating the system performance. This paper encloses this key problem and launches researches on performance analysis and simulation experiment technology of distributed satellite SAR-GMTI system.Firstly, based on distributed satellite SAR-GMTI principle, for two kinds of processing technology: SAR-ATI and SAR-DPCA technology, performance indicators and performance analysis method of the system are given, and then system performance of main influence factors are carded.Secondly, based on formation satellite orbit model, three-dimensional scene ground clutter signal model and moving target signal model, satellite SAR-GMTI system simulation modeling and enforcing method are studied. A distributed satellite SAR-GMTI system performance evaluation method is presented, and combined with the simulation experiment, the effectiveness of the evaluation method is verified. In addition, a set of distributed satellite SAR-GMTI system simulation software is introduced, which is developed by our staff-room-team, and a whole process of system simulation is given.Finally, by application of distributed satellite SAR-GMTI system simulation software and performance evaluation method, different levels of distributed satellite SAR-GMTI system performance simulation experiments is carried out with composite errors in different conditions in it. The simulation verifies the coherence of the theoretical performance analysis results and the performance evaluation results.更多还原