星间链路收发信机抗窄带干扰性能限研究

发布时间：2018-04-17 19:06

本文选题：星间链路 + 收发信机　；参考：《国防科学技术大学》2014年硕士论文

【摘要】：收发信机的抗干扰性能关系到星间链路系统的安全性,在高精度测距和有限星载处理能力约束下增加抗干扰环节会增加收发信机复杂度并且引入测距误差,盲目增加抗干扰措施得不偿失,定量分析扩频测距中的天然抗窄带干扰能力可以为在什么条件下不需要采取抗干扰措施提供决策,对优化系统设计具有重要意义。扩频天然具有一定的抗窄带干扰能力,在干扰能量小时,扩频自然可以抗干扰,在干扰能量大时,扩频还是不能抗干扰,这个能量的临界线就是本文要研究的性能限。由此产生了本文研究的基本问题——能否用某种量值来定量地表示扩频测距中的抗窄带干扰的天然能力。为此必须解决以下三个关键技术问题:1.扩频测距的抗窄带干扰性能限的定义问题。在测距优化设计中,用什么量值作为性能限,关系到性能限的研究思路和分析方法,也决定了结论能否直接指导接收机设计决策。因此,如何定义扩频测距的抗窄带干扰性能限成为星间链路收发信机抗窄带干扰性能限研究的关键技术问题。2.抗单频干扰性能限的定量计算方法问题。单频干扰是窄带干扰的极限状态,窄带信号与单频信号具有相似的特征,因此其对测量误差的影响是相似的。可以先研究单频干扰的影响机理,从中发现特征与规律,作为窄带干扰的性能限的定性认识,从中找到研究方向和解决问题的思路。因此,如何定量计算扩频测距的抗单频干扰性能限成为星间链路收发信机抗窄带干扰性能限研究的关键技术问题。3.抗窄带干扰性能限的定量确定研究问题。窄带信号的影响很复杂,可以理解为无限多个单频的总和。显然抗单频干扰性能限并非直观可见的,所以确定抗窄带干扰性能限是一件极其困难的事。因此,如何定量确定扩频测距的抗窄带干扰性能限成为星间链路收发信机抗窄带干扰性能限研究的关键技术问题。为解决第一个关键技术问题,论文对扩频测距的抗窄带干扰性能限进行了定义;为解决第二个关键技术问题,论文对扩频测距的抗单频干扰性能限进行了定量计算;为解决第三个关键技术问题,论文对扩频测距的抗窄带干扰性能限进行了定量分析。论文以采用CSTDD信号体制的星间链路收发信机的抗窄带干扰性能限为研究对象,对上述关键技术问题进行定量计算、分析,设计实验测试方法和系统,得到了一定的理论研究成果,达到了预期目的。
[Abstract]:The anti-jamming performance of transceiver relates to the security of intersatellite link system. Under the constraint of high precision ranging and limited spaceborne processing ability, increasing anti-jamming link will increase the complexity of transceiver and introduce ranging error.Blind increase of anti-jamming measures outweighs the loss. Quantitative analysis of the natural narrowband interference resistance in spread spectrum ranging can provide a decision on the conditions under which anti-jamming measures are not needed, which is of great significance to the optimization of system design.Spread spectrum has a certain ability to resist narrowband interference. When interference energy is small, spread spectrum can resist interference. When interference energy is large, spread spectrum can not resist interference. This critical line of energy is the performance limit to be studied in this paper.As a result, the basic problem studied in this paper is whether the natural ability to resist narrowband interference in spread spectrum ranging can be quantitatively expressed by a certain quantity.To this end, we must solve the following three key technical issues: 1.Definition of narrowband interference performance limits for spread spectrum ranging.In the optimal design of ranging, what value is used as the performance limit, which is related to the research ideas and analysis methods of the performance limit, which also determines whether the conclusion can direct the design decision of the receiver.Therefore, how to define the narrow-band interference performance limit of spread spectrum ranging becomes the key technical problem in the research of narrowband interference performance limit of inter-satellite link transceiver.The problem of quantitative calculation method for the performance limit of anti-single frequency interference.Single frequency interference is the limit state of narrow band interference, and narrow band signal and single frequency signal have similar characteristics, so their influence on measurement error is similar.The influence mechanism of single frequency interference can be studied first, and the characteristics and rules can be found out from it, which can be regarded as the qualitative recognition of the performance limit of narrowband interference, and the research direction and the way to solve the problem can be found out.Therefore, how to calculate quantitatively the anti-interference performance limit of spread spectrum ranging has become the key technical problem in the research of narrowband interference performance limit of inter-satellite link transceiver.Quantitative determination of narrowband interference performance limits.The influence of narrowband signals is complex and can be understood as the sum of infinite single frequencies.It is obvious that the performance limit against single frequency interference is not directly visible, so it is very difficult to determine the performance limit of narrow band interference.Therefore, how to quantitatively determine the narrowband interference performance limit of spread spectrum ranging has become a key technical problem in the study of narrowband interference performance limit of inter-satellite link transceiver.In order to solve the first key technical problem, this paper defines the performance limit of anti-narrowband interference of spread spectrum ranging, and in order to solve the second key technical problem, the performance limit of anti-single frequency interference of spread spectrum ranging is calculated quantitatively.In order to solve the third key technical problem, the performance limit of narrowband interference in spread spectrum ranging is quantitatively analyzed in this paper.Taking the narrowband interference rejection performance limit of inter-satellite link transceiver based on CSTDD signal system as the research object, the key technical problems mentioned above are quantitatively calculated, analyzed, and the experimental test method and system are designed.Some theoretical research results have been obtained, and the expected purpose has been achieved.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.4;TN967.1

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