一种通用的卫星导航信号码时延估计误差评估方法

发布时间：2018-03-01 12:45

本文关键词： 卫星导航信号码时延估计误差评估方法　出处：《物理学报》2017年12期 　论文类型：期刊论文

【摘要】：卫星导航信号的码时延估计误差是决定系统服务性能的关键因素,迫切需要对多种不同调制与复用方式的导航信号进行全面的码时延估计误差性能评估,从而为后期的系统应用提供重要的选择依据.为此,本文提出了通用的码时延估计误差评估方法.首先,概括了导航接收机的码跟踪环路模型,根据是否匹配接收以及是否相干处理,将目前的导航接收机归纳为四种类型.其次,在假设码时延估计误差非常小的条件下,分别给出了匹配接收下相干处理和非相干处理时的估计误差以及相互之间的关系;推导了非匹配接收下非相干处理时的估计误差,并讨论了与相干处理时的关系.最后,推导了码时延估计误差的齐夫-扎凯界限,解决了估计误差不满足非常小这一假设条件时的评估.本文提出的评估方法均以导航信号的功率谱密度表示,为信号设计和接收机的研制提供了重要的理论指导,同时也给具体信号的评估带来了极大便利.仿真实验中对新一代典型导航信号的码时延估计误差做了有效评估.
[Abstract]:The code delay estimation error of satellite navigation signal is the key factor to determine the service performance of the system. It is urgent to evaluate the performance of code delay estimation error for navigation signals with different modulation and multiplexing modes. This provides an important basis for the later application of the system. For this reason, this paper presents a general method for evaluating the error of code delay estimation. Firstly, the code tracking loop model of the navigation receiver is summarized. According to the matching reception and coherent processing, the current navigation receivers are classified into four types. Secondly, under the assumption that the code delay estimation error is very small, The estimation errors of coherent processing and incoherent processing under matched reception and the relationship between them are given respectively, the estimation errors of non-coherent processing under mismatched reception are derived, and the relation with coherent processing is discussed. The Zef-Zakay bound of code delay estimation error is derived, and the evaluation of the estimation error is solved when the estimation error does not satisfy the condition of very small. The methods proposed in this paper are expressed by the power spectral density of the navigation signal. It provides important theoretical guidance for signal design and receiver development, and also brings great convenience to the evaluation of specific signals. In the simulation experiment, the code delay estimation error of a new generation of typical navigation signals is effectively evaluated.
【作者单位】：信息工程大学导航与空天目标工程学院;清华大学电子工程系;
【基金】：国家自然科学基金(批准号:D040103)资助的课题~~
【分类号】：TN967.1

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