The inter - link of tdrss contained forward link and return link . the forward link is the signal retransmitted from earth station to relay satellite , then transmitted the tt & c to the user aircraft 前向链路指地面站经数据中继卫星转发信号,向用户航天器(包括成像侦察卫星、航天飞机与载人飞船等)发送跟踪、遥测与控制指令。
Because china ' s aerospace program has military applications , and the us already has numerous reconnaissance satellites , a future us - china arms race in the final frontier could be more plausible than not 因为中国航空发展具有军事倾向，而美国又具有数不清的军事侦察卫星，可以预料的是，在将来，中美军备竞赛是必不可免的了。
The shape of o constellation is an efficient way to program the missions of regional coverage of reconnaissance satellite constellation , the methods to design o con stellation are discussed in case of two - body or j2 influence 星座构型是解决侦察卫星星座区域覆盖的有效方法，本文在二体假设和考虑地球j2项影响两种情况下对星座进行了设计。
The dissertation considers cooperation and autonomy are important domains to study the reconnaissance satellite constellation , and some key problems in the domains of cooperation and autonomy are studied in the dissertation 本文认为卫星协同与自治的研究是进行军用侦察卫星星座研究的一个重要领域，因此论文围绕卫星协同与自治的一些关键问题进行研究。
The reconnaissance satellite constellation is constituted by some reconnaissance satellites , which cooperate with each other in accomplishing the missions of intelligence , surveillance and reconnaissance ( isr ) 军用侦察卫星星座是指由多颗侦察卫星构成的一个卫星群，它们通过协同工作来完成在一定时间、空间分辨率约束下的情报、监视和侦察（ isr ）任务。
High resolution direction - finding using array signal processing plays an important role in the new electronic reconnaissance satellite system . several algorithms , such as music esprit , wsf , foc - music , are researched in this paper . the analysis of these algorithms principle and the comparison of their performance from the point of view of engineering are given too 采用阵列信号处理进行高分辨率测向是新体制电子侦察卫星最关键的一个环节，本文研究了music 、 esprit 、 wsf 、 foc ? music等算法的原理并从工程实用的角度分析比较了它们的性能。
The uav ( unmanned air vehicle ) is playing an more and more important role in modern wars . it is featured by long endurance , large cruise range , heavy overload capability as well as attitude alteration limitless and casualty avoid when flying in hostile territory compared to manned air vehicle . compared to satellites it has low altitude , controllable movement , convenient arrangement and low cost 无人机在现代战争中扮演着越来越重要的角色，与有人驾驶飞机相比，无人机机动性能好，过载能力强，不存在飞行员伤亡；与侦察卫星相比，无人机飞行高度低，活动范围可控，部署方便，造价低廉，目前各国都在积极研制各种新型无人机。
In the first , this article introduces the knowledge of orbit designing , then this article summarizes the basic methods and principles of orbit designing . in the later , this article describes the conception of node period about orbit designing emphatically which has been advanced by the writer . at the same time , this article describes the process of the writer ' s analysing and designing the orbit of earth spying satellite particularly with the conception . in the last , this article describes the wirter ' s analysing and simulating the designing results 本文首先介绍了轨道设计的基本知识，然后总结了轨道设计的基本的方法和原则。在随后部分重点对卫星轨道设计中交点周期的概念提出了自己的看法，同时应用此结果详细分析和设计了对地侦察卫星的太阳同步回归轨道，最后对此设计结果进行详细仿真分析。
In the case of imaging reconnaissance satellite ( irs ) observing area target , different part of the target can be observed as different elevation is chosen . this situation brings an optimization problem : how to choose the elevation of every access to guarantee the maximal efficiency of the whole process 多颗成像侦察卫星在指定的时间段内对单个区域目标进行观测时,选择不同观测方案会产生不同的时间覆盖率与空间覆盖率效果,如何选定观测方案,使得观测活动能够更好的达到所需要的覆盖率效果是一个重大的优化问题。
