具有空时二维分辨能力的多径干扰抑制算法

发布时间：2018-10-23 10:58

【摘要】：针对全球卫星导航系统(Global Navigation Satellite System,GNSS)中的多径干扰抑制问题,本文提出了一种有效的算法,该算法首先对接收到的数据进行捕获,以获得各卫星信号的参数粗估结果,接着利用WRELAX(Weighted RELAXation)技术,在空时二维空间中逐一估计出直达卫星信号和多径干扰的来向、码时延和幅度信息;并根据所估计到的参数来区分多径干扰和直达信号;此外,本文在进行二维参数估计时,根据捕获到的码时延的信息,限定码时延的搜索范围的方法显著降低了算法运算量.由于空时二维处理能够同时从空域和时域区分直达卫星信号和多径干扰,因此能够更好地实现多径干扰抑制.最后,通过仿真实验验证了本文算法较之传统多径干扰抑制算法的优越性.
[Abstract]:Aiming at the problem of multipath interference suppression in global satellite navigation system (Global Navigation Satellite System,GNSS), an effective algorithm is proposed in this paper. Firstly, the received data are captured in order to obtain the rough estimation results of the parameters of each satellite signal. Then, using WRELAX (Weighted RELAXation) technology, the direct satellite signal and the direction of multipath interference are estimated one by one in the space and two-dimensional space, the code delay and amplitude information are estimated, and the multipath interference and the direct signal are distinguished according to the estimated parameters. In this paper, according to the acquired information of code delay, the searching range of code delay is greatly reduced when the two-dimensional parameter is estimated. Because space-time two-dimensional processing can distinguish direct satellite signals and multipath interference from spatial domain and time domain at the same time, multipath interference suppression can be realized better. Finally, simulation results show that the proposed algorithm is superior to the traditional multipath interference suppression algorithm.
【作者单位】：中国民航大学天津市智能信号与图像处理重点实验室;
【基金】：国家自然科学基金(No.61471363)
【分类号】：TN967.1

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