GNSS信号的线性调频干扰抑制方法

doi:10.12305/j.issn.1001-506X.2025.07.26

Abstract

Abstract:

To address the issue of global navigation satellite system (GNSS) signal being susceptible to radio frequency interference, a linear frequency modulation (LFM) interference suppression method is proposed. Firstly, a fourth-order time-domain autocorrelation method to estimate the parameters of LFM signal is introduced. Secondly, an LFM interference suppression module for single-antenna GNSS receivers is designed. It utilizes the estimated LFM signal parameters to concentrate the energy of interference signals in the frequency domain and employs a configurable second-order notch filter to remove the interference. Finally, simulation experiments validate the effectiveness of the LFM signal parameter estimation and the interference suppression result. The experimental results demonstrate that when the jamming-to-signal ratio reaches 80 dB, the tracking carrier-to-noise ratio loss of satellite signals after interference suppression is 3.5 dB·Hz. The proposed method effectively suppresses LFM interference, ensuring the interference suppression performance of GNSS receivers against strong LFM interference.

Key words: linear frequency modulation (LFM) signal, global navigation satellite system (GNSS) interference suppression, interference parameter estimation, GNSS receiver

CLC Number:

TN973.3

Xiaohui BA, Wenfei WEN, Baigen CAI, Jian WANG, Wei JIANG, Linguo CHAI. Linear frequency modulation interference suppression method for GNSS signal[J]. Systems Engineering and Electronics, 2025, 47(7): 2339-2348.

Figures/Tables 10

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References 34

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参数	数值
采样率f_s/MHz	32.768
中频f_IF/MHz	7.161
卫星导航信号载噪CN₀/(dB·Hz)	44(对应-130 dBm)
量化比特数/bit	16
起始频率f₀/MHz	7.058 7
调频率k/(Hz/s)	2.046×10⁸
LFM周期T/ms	1

类别	参数	平均误差(×10^-6)/s
类别	参数	20	25	30	35
周期估计样本	平均误差(×10^-6)/s	5.40	6.30	6.84	6.84
周期估计样本	标准差(×10^-6)	3.37	2.26	0	0
调频率估计样本	平均误差/ (MHz/s)	0.4	0.4	0.4	0.4
调频率估计样本	标准差	0	0	0	0
初始频率估计样本	平均误差/ Hz	195.22	194.85	194.19	194.07
初始频率估计样本	标准差	10.94	6.55	3.96	2.53

类别	文献[7]	文献[8]	本文
特点	基于检测概率设置FRFT域的干扰门限	基于Radon-Wigner变换的LFM干扰抑制方法	基于时域自相关方法估计LFM干扰信号的参数
性能	干扰抑制后, 干噪比为2 dB时, 输出信噪比相较于干噪比为-8 dB时下降2 dB	在复杂干扰场景下, GPS L1频段C/A信号的码相位延迟和多普勒频移可以正常恢复	在JSR达到80 dB时, 卫星信号的跟踪载噪比损失值仅为3.5 dB·Hz
优点	在FRFT域的最优变换阶数下, LFM干扰的能量集中, 而有用信号平坦分布, 利于滤除干扰	通过Radon-Wigner变换估计LFM信号的参数, 可以解决时频分析技术中的交叉项问题	设计针对不同强度等级的LFM干扰信号的参数估计方法, 初始频率估计精度较高
缺点	需要搜索最优阶数, 搜索范围和搜索步长难以确定, 计算量较大	初始频率估计精度较低, 且只验证了干噪比为10 dB条件下的干扰抑制效果	四阶时域自相关方法不适用于低JSR条件

参数	实验组别
参数	1	2	3	4
调频率误差/(kHz/s)	2.52	25.2	2.52	25.2
初始频率误差/Hz	1.34	1.34	13.4	13.4
卫星信号跟踪载噪比/(dB·Hz)	38.42	38.38	38.30	38.24

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Linear frequency modulation interference suppression method for GNSS signal

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