卫星导航系统压制式干扰监测关键技术研究

发布时间：2018-03-26 15:03

本文选题：卫星导航系统　切入点：干扰监测　出处：《湖南大学》2014年硕士论文

【摘要】：复杂电磁环境一直影响着卫星导航系统的稳定运行，电磁干扰给导航系统的性能带来不同程度的影响，抗干扰问题已成为卫星导航系统建设中必须考虑的问题。干扰监测是各种抗干扰措施实施的前提，因此，卫星导航系统干扰监测技术的研究具有十分重要的意义。本文对卫星导航系统压制式干扰监测的关键技术进行了初步的研究，分析了典型压制式干扰的可观测特征，提出了兼顾低虚警率及低漏警率的干扰监测算法和一种大动态范围自动增益控制（Automatic GainControl, AGC）算法，设计并实现了一种北斗卫星导航在线干扰监测系统中的实时监测分析软件，，其研究成果已成功应用于某重大专项工程项目。本文的主要研究内容包括：（1）针对卫星导航系统中常见的压制式干扰进行了特征分析，分析得到了可用于干扰识别的特征参数；针对脉冲式压制干扰，提出了一种基于自适应脉宽判决门限的监测算法；针对连续波压制干扰，提出了一种基于双门限判决的监测算法；这两种压制式干扰监测算法在设计上保证了干扰判决时的虚警和漏警同时处于较低的水平，二者结合可以实现对压制式干扰的低虚警和低漏警监测。（2）针对复杂电磁环境下的大动态范围干扰信号监测需求，通过分析高斯干扰和单频干扰样式下传统AGC的不足，提出了基于限幅比例的大动态AGC算法，该算法能够适应不同的干扰类型，完全利用单频干扰的有效比特数，使得输入信号的量化之后的信噪比损耗最小，保证不同干扰样式下的接收性能。（3）以干扰信号分析以及提出的干扰监测算法为基础，设计并实现了实时监测分析软件，该软件包含三种工作模式，分别是可完成对干扰信号进行实时在线监测的在线分析模式、完成事后精确分析的离线分析模式以及完成软件仿真自校的仿真分析模式；依托北斗卫星导航在线干扰监测平台的实测分析，对本文提出的压制式干扰监测算法、自动增益控制算法以及设计实现的实时监测分析软件进行了有效验证。测试结果证明了本文提出的压制式干扰监测算法和基于限幅比例AGC增益控制算法的有效性和优良性能，能够为北斗卫星导航系统干扰监测系统的建设提供有力支撑，具有一定的实用价值和应用前景。
[Abstract]:The complex electromagnetic environment has always affected the stable operation of the satellite navigation system, and electromagnetic interference has brought about varying degrees of impact on the performance of the navigation system. Anti-jamming problem has become a problem that must be considered in the construction of satellite navigation system. Interference monitoring is the premise of various anti-jamming measures, so, It is of great significance to study the jamming monitoring technology of satellite navigation system. In this paper, the key technologies of suppression jamming monitoring in satellite navigation system are studied preliminarily, and the observable characteristics of typical suppression jamming are analyzed. An interference monitoring algorithm with low false alarm rate and low leakage alarm rate and an automatic gain Control (AGCL) algorithm with large dynamic range are proposed. A real-time monitoring and analysis software for Beidou satellite navigation online jamming monitoring system is designed and implemented. Its research results have been successfully applied to a major special project. The main contents of this paper are as follows:. 1) the characteristic analysis of the common suppression jamming in the satellite navigation system is carried out, and the characteristic parameters that can be used to identify the interference are obtained, and a monitoring algorithm based on the adaptive pulse width decision threshold is proposed for the pulse suppression jamming. For continuous wave suppression interference, a two-threshold decision based monitoring algorithm is proposed, which is designed to ensure that both false alarm and false alarm are at a lower level. The combination of the two can realize low false alarm and low false alarm monitoring to suppress interference. Aiming at the monitoring requirement of large dynamic range interference signal in complex electromagnetic environment, a large dynamic AGC algorithm based on amplitude limiting ratio is proposed by analyzing the shortcomings of traditional AGC under Gao Si interference and single frequency interference mode. The algorithm can adapt to different interference types and make full use of the effective bit number of single frequency interference to minimize the SNR loss after quantization of the input signal and ensure the reception performance under different interference patterns. Based on the interference signal analysis and the proposed interference monitoring algorithm, a real-time monitoring and analysis software is designed and implemented. The software includes three working modes, one is the on-line analysis mode, which can realize the real-time on-line monitoring of the interference signal, and the other is the real-time on-line monitoring of the interference signal. The off-line analysis mode of accurate analysis after the event and the simulation analysis mode of software simulation self-calibration are completed. Based on the actual measurement and analysis of Beidou satellite navigation online jamming monitoring platform, the suppression jamming monitoring algorithm proposed in this paper is analyzed. The automatic gain control algorithm and the real-time monitoring and analysis software designed and implemented are validated effectively. The test results show the effectiveness and excellent performance of the suppression interference monitoring algorithm and the gain control algorithm based on the amplitude limiting proportional AGC. It can provide strong support for the construction of interference monitoring system of Beidou satellite navigation system, and has certain practical value and application prospect.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN96.1

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