GNSS信号的线性调频干扰抑制方法

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关键词：线性调频信号；全球导航卫星系统干扰抑制；干扰参数估计；全球导航卫星系统接收机中图分类号：TN973.3 文献标志码：A DOI：10. 12305/j. issn. 1001-506X. 2025.07. 2

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 ofLFM signal is introduced. Secondly，an LFM interference suppresson module for single-antenna GNSS receivers is designed.Itutilizes 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 efectivenessof theLFM signal parameter estimation and the interference suppression result. The experimental results demonstrate that when the jamming-to-signal ratio reaches 80dB ， the tracking carrier-to-noise ratio loss of satelite signals after interference suppression is 3.5dB⋅Hz The proposed method efectively suppresses LFM interference， ensuring the interference suppression performance of GNSS receivers against strong LFM interference.

Keywords： linear frequency modulation （LFM） signal； global navigation satellte system （GNSS） interference suppression；interference parameter estimation;GNSS receiver

0 引言

全球导航卫星系统（globalnavigationsatellitesystem，GNSS）信号采用直接序列扩频（directsequencespreadspectrum，DSSS）通信技术，受益于编码增益以及扩频增益，本身具备一定的抗干扰能力，但是当外部干扰大于直扩系统的干扰容限时，系统的性能会急剧下降。（剩余17127字）