北京航空航天大学学报 ›› 2018, Vol. 44 ›› Issue (6): 1239-1245.doi: 10.13700/j.bh.1001-5965.2017.0417

• 论文 • 上一篇    下一篇

GNSS多径信号模型及测高方法

李惟, 朱云龙, 王峰, 杨东凯   

  1. 北京航空航天大学 电子信息工程学院, 北京 100083
  • 收稿日期:2017-06-20 出版日期:2018-06-20 发布日期:2018-06-28
  • 通讯作者: 朱云龙.E-mail:zhuyunlong@buaa.edu.cn E-mail:zhuyunlong@buaa.edu.cn
  • 作者简介:李惟 女,硕士研究生。主要研究方向:卫星导航;朱云龙 男,博士,讲师,硕士生导师。主要研究方向:卫星导航、被动遥感、室内定位、信号处理等;王峰 男,博士研究生。主要研究方向:卫星导航;杨东凯 男,博士,教授,博士生导师。主要研究方向:卫星导航信号处理及应用技术、无线数据传输等。
  • 基金资助:
    北航北斗技术成果转化及产业化资金资助项目(BARI1706,BARI1709)

GNSS multipath signal model and altimetry method

LI Wei, ZHU Yunlong, WANG Feng, YANG Dongkai   

  1. School of Electronic and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2017-06-20 Online:2018-06-20 Published:2018-06-28

摘要: 提出利用全球导航卫星系统反射信号的干涉方法(GNSS-IR)进行测高。深入分析全球导航卫星系统反射信号的多径信号模型(GNSS-MR),在此基础上提出单天线测高模型,旨在获取多径信号信噪比(SNR)频率信息,从而反演出高度信息。Lomb-Scargle(LS)谱分析方法是单天线测高模型中常用的频率提取方法;提出了基于解析模型拟合的方法对多径信号信噪比数据提取频率,同样可以准确获取频率信息,从而反演出天线到地面的高度。在此基础上,讨论了单天线测高的最大测量高度和接收机需要满足的最小输出率。由实验数据分析得出:传统LS谱分析方法和拟合法在反演效果最优时,即LS谱分析方法在高度角上限为17°时,均方根误差为0.028 75 m;拟合法在高度角上限为21°时,均方根误差为0.024 85 m。通过比较不同高度角上限的均方根误差,可以获得最优化的高度反演条件,同时也表明了拟合法的可行性。

关键词: 测高, 全球导航卫星系统反射信号的干涉方法(GNSS-IR), 全球导航卫星系统反射信号的多径信号模型(GNSS-MR), Lomb-Scargle(LS)谱, 拟合

Abstract: The method of global navigation satellite system-interferometric reflection (GNSS-IR) was developed to realize the altimetry. The model of global navigation satellite system-multipath reflection (GNSS-MR) was analyzed in depth. A single antenna height measurement model was proposed to obtain the signal-to-noise ratio (SNR) and frequency information of multipath signals, so as to reverse the height information. The Lomb-Scargle (LS) periodogram is a commonly used extraction method of the height measurement model of single antenna. In this paper, a new method based on analytic model fitting method was proposed and the frequency information can be acquired accurately for the SNR of the multipath signals. Thus the height of antenna to ground was reversed. On this basis, the maximum measurement height and the minimum output rate required by the receiver were discussed. From the analysis of experimental data, it can be concluded that when the best results of inversion are obtained, that is, as for LS periodogram, when the upper limit of elevation angle reaches to 17°, the RMSE is 0.028 75 m; as for the fitting method, when the upper limit reaches to 21°, the RMSE is 0.024 85 m. By comparing the RMSE of different upper limit of elevation angle, the best condition of height inversion can be retrieved. And it can also prove the practicability of the fitting method.

Key words: altimetry, global navigation satellite system-interferometric reflection(GNSS-IR), global navigation satellite system-multipath reflection (GNSS-MR), Lomb-Scargle (LS) periodogram, fitting

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