摘要
北斗卫星导航系统是着眼于国家安全和经济社会发展需要,自主建设运行的全球卫星导航系统,是国家重要时空基础设施。随着北斗导航的应用场景不断深入,面对北斗导航弱干扰源的到达时间差(time difference of arrival, TDOA)定位方法出现的时延估计难和定位误差大等问题,提出了一种自适应滤波广义互相关的时延估计方法,并结合Chan-Taylor解算定位干扰源。该方法首先通过自适应滤波对原始干扰源接收信号进行降噪处理,然后通过广义互相关(GCC)进行时延估计,解决在低信噪比情况下传统互相关时延难以估计的问题,然后通过Chan-Taylor的解算方法提升定位准确度。通过仿真验证该方法相比GCC-ChanTaylor在均方根误差(root mean square error, RMSE)有较好的提高,结果表明在低信噪比情况下该方法对北斗导航弱干扰源定位具有优越性。
The BDS is a global satellite navigation system built and operated independently for national security and economic and social development needs, and is an important national space-time infrastructure. As the application scenarios of BDS continue to deepen, facing the problems of time delay estimation and large positioning errors arising from the TDOA localization method of weak interferers of BDS, an adaptive filtering generalized correlation time delay estimation method is proposed and combined with Chan-Taylor solution to locate the interferers. The method firstly performs noise reduction on the received signal of the original interference source by adaptive filtering, and then performs time delay estimation by generalized mutual correlation to solve the problem that the time delay of traditional mutual correlation is difficult to estimate in the case of low signal-to-noise ratio, and then improves the localization accuracy by Chan-Taylor′s solving method. It is verified through simulation experiments that the method has better improvement in RMSE compared with GCC-ChanTaylor, and the results show the superiority of the method for the positioning of weak interference sources in BDS under the low signal-to-noise ratio.
作者
李智超
姚金杰
孙兴丽
赵昶淳
Li Zhichao;Yao Jinjie;Sun Xingli;Zhao Changchun(ShanxiKey Laboratory of Signal Capturing&.Processing,North University of China,Taiyuan 030051,China)
出处
《国外电子测量技术》
北大核心
2022年第10期33-38,共6页
Foreign Electronic Measurement Technology
基金
山西省重点研发计划(202102010101002)
山西省青年科学基金(201901D211242)项目资助。
