基于软件无线电的GNSS干扰和多径监测系统设计

发布时间：2018-02-09 03:25

本文关键词： 全球导航卫星系统干扰监测多径监测软件无线电　出处：《电讯技术》2017年03期 　论文类型：期刊论文

【摘要】：针对干扰和多径导致全球导航卫星系统(GNSS)不能精确、安全和可靠地提供位置、速度和时间服务等问题,分析了研制GNSS干扰和多径监测系统的意义,介绍了当前干扰和多径常用的检测方法,设计了一套针对当前四大导航系统(美国GPS、俄罗斯GLONASS、欧盟Galileo和中国BDS)各信号带内以及附近频率的干扰和多径监测系统。系统基于软件无线电(SDR)思想,采用模块化设计,具有良好的功能扩展性和配置灵活性。根据不同干扰的特点,结合实际应用改进了其检测算法:采用能量阈值法检测不同形式的压制式干扰,采用基于捕获多相关峰法判别欺骗式干扰,采取基于最大似然准则的多径估计延迟锁定环(MEDLL)技术估计多径信号的参数。实验结果表明系统能够有效检测各种干扰和多径信号的存在,使用户获取其特征参数,为干扰源的定位、查处、排除、规避以及多径信号的抑制提供决策依据。
[Abstract]:In order to solve the problem that global navigation satellite system (GNSS) can not provide location, speed and time service safely and reliably due to interference and multipath, the significance of developing GNSS jamming and multipath monitoring system is analyzed. The current detection methods of interference and multipath are introduced. A set of interference and multipath monitoring system is designed for the four current navigation systems (US GPS, Russian GLONASS, EU Galileo and China BDS). The system is based on the idea of software radio (SDR) and is designed by modularization. It has good function expansibility and configuration agility. According to the characteristics of different interference and practical application, the detection algorithm is improved: the energy threshold method is used to detect different forms of suppression interference, Based on the capture of multiple correlation peaks, the deceptive interference is identified. The multipath estimation delay locking loop (MEDLL) technique based on the maximum likelihood criterion is used to estimate the parameters of multipath signals. The experimental results show that the system can effectively detect all kinds of interference and the existence of multipath signals and enable users to obtain their characteristic parameters. It provides a decision basis for the location, detection, elimination, avoidance and suppression of multipath signals.
【作者单位】：清华大学电子工程系;
【分类号】：TN92;TN967.1

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