Wideband LFM Interference Suppression of GNSS Receiver Based on Fractional Fourier Transform and Power Inversion

2021 International Symposium on Computer Technology and Information Science (ISCTIS) Pub Date : 2021-06-01 DOI:10.1109/ISCTIS51085.2021.00083

Zeze Yang, Yubai Li, Lei Mao, Fei Wang, Jun Pan

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Abstract

In order to improve the anti-jamming ability of global navigation satellite system (GNSS) receiver against wideband LFM jamming signal, a novel wideband LFM interference suppression method based on fractional Fourier transform (FRFT) and power inversion (PI) algorithm is proposed. Firstly, the fractional Fourier (FRF) domain correlation matrix of array received signal with wideband LFM interference is derived to replace the traditional correlation matrix. Then, the PI algorithm is used to suppress the wideband LFM interference in the FRF domain. Finally, the inverse FRFT is taken to get the signal with the LFM interference being mitigated. Simulation results demonstrate that the proposed method can effectively suppress the wideband LFM interference. Even though the direction-of-arrival(DOA) of the GNSS signal is similar to or even the same as that of the wideband LFM interference, it can also effectively suppress the interference signal without causing significant GNSS signal loss, and it can provide correctly acquisition.

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基于分数阶傅里叶变换和功率反演的GNSS接收机宽带LFM干扰抑制

为了提高全球导航卫星系统(GNSS)接收机对宽带LFM干扰信号的抗干扰能力，提出了一种基于分数阶傅立叶变换(FRFT)和功率反演(PI)算法的宽带LFM干扰抑制方法。首先，推导了宽带LFM干扰下阵列接收信号的分数阶傅里叶域相关矩阵，取代了传统的相关矩阵;然后，利用PI算法抑制频响域的宽带LFM干扰。最后，采用反频域傅立叶变换得到信号，并对LFM干扰进行了抑制。仿真结果表明，该方法能有效抑制宽带LFM干扰。即使GNSS信号的到达方向(DOA)与宽带LFM干扰相似甚至相同，也可以有效地抑制干扰信号，而不会造成明显的GNSS信号损失，并且可以提供正确的采集。

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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2021 International Symposium on Computer Technology and Information Science (ISCTIS)

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