A Fitting Method of RF Channel Group Delay Characteristics for High Precision Navigation

2020 IEEE 10th International Conference on Electronics Information and Emergency Communication (ICEIEC) Pub Date : 2020-07-01 DOI:10.1109/ICEIEC49280.2020.9152281

Fengyi Wang, Pengpeng Li, Shuibin Zhong, Shaojie Ni

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引用次数: 1

Abstract

The group delay and amplitude characteristics of the receiver signal channel are mainly determined by the Radio Frequency front-end, whose amplitude and phase characteristics can be approximated to a nonlinear phase band-pass filter. Among them, group delay has a great influence on high-precision navigation and positioning system. In the high-precision navigation receiver, in order to better evaluate the influence of group delay characteristics on the receiver, it is necessary to accurately measure the group delay characteristics of the receiver and fit it with high-precision. Based on the group delay characteristics of the receiver channel measured by the vector network analyzer, this paper proposes a fitting method which combines the piecewise fitting and the Fourier decomposition. Through the experimental simulation, it can be concluded that this method has the advantages of high precision and small computation compared with the polynomial fitting method based on the least square method (LSM) and approximate fitting method of group delay Fourier decomposition.

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高精度导航射频信道群延迟特性的拟合方法

接收信号信道的群延迟和幅度特性主要由射频前端决定，射频前端的幅度和相位特性可以近似为一个非线性相位带通滤波器。其中，群时延对高精度导航定位系统的影响较大。在高精度导航接收机中，为了更好地评估群延迟特性对接收机的影响，需要对接收机的群延迟特性进行精确测量并进行高精度拟合。根据矢量网络分析仪测量的接收机信道群时延特性，提出了分段拟合与傅里叶分解相结合的拟合方法。通过实验仿真，与基于最小二乘法(LSM)的多项式拟合方法和群延迟傅立叶分解的近似拟合方法相比，该方法具有精度高、计算量小的优点。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2020 IEEE 10th International Conference on Electronics Information and Emergency Communication (ICEIEC)

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