Multi-component LFM interference suppression method based on chirp rate turning point and FrFT

QI Liangang; HAN Yanze; WANG Yani; GUO Qiang; Kaliuzhny MYKOLA

doi:10.7527/S1000-6893.2022.26840

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2022 , Vol. 43 >Issue 8: 326840 - 326840

DOI: https://doi.org/10.7527/S1000-6893.2022.26840

Electronics and Electrical Engineering and Control

Multi-component LFM interference suppression method based on chirp rate turning point and FrFT

QI Liangang ,
HAN Yanze ,
WANG Yani ,
GUO Qiang ,
Kaliuzhny MYKOLA

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1. College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China;
2. Agile and Intelligent Computing Key Laboratory of Sichuan Province, The 10th Research Institute of China Electronics Technology Corporation, Chengdu 610036, China;
3. Key Laboratory of Advanced Marine Communication and Information Technology, Ministry of Industry and Information Technology, Harbin 150001, China;
4. Kharkiv National University of Radio Electronics, Kharkiv 61166, Ukraine

Received date: 2021-12-21

Revised date: 2022-05-20

Online published: 2022-05-19

Supported by

National Natural Science Foundation of China (62101155,62071140);Research Funds for the Central Universities under Grant (3072022CF0801);National Key R&D Plan (2018YFE0206500)

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Abstract

The single-antenna satellite navigation receiver has a large loss of signal-to-noise ratio in the process of suppressing multi-component Linear Frequency Modulation (LFM) interference. To solve this problem, a multi-component LFM interference suppression method is proposed based on the chirp rate turning point and Fractional Fourier Transforml (FrFT). Firstly, the monotonicity of the modulo value of the time-domain differential data of the LFM interference signal in a single cycle and the discontinuity of the value at the start and end points of the cycle are analyzed. Secondly, the difference results are reconstructed by Singular Value Decomposition (SVD) to estimate the chirp rate turning point interval of the LFM frequency. Then, the center area of a single period of interference is selected for FrFT optimal order search and noise energy estimation. Finally, the interference components and the residual interference in the fractional Fourier domain and the time domain are removed, respectively. Simulation results show that the proposed method can improve the output signal-to-interference-to-noise ratio and capture effect when the interference-to-noise ratio is greater than 10 dB.

Key words： satellite navigation system; single antenna receiver; Linear Frequency Modulation (LFM); Fractional Fourier Transform (FrFT); Singular Value Decomposition (SVD)

Cite this article

QI Liangang , HAN Yanze , WANG Yani , GUO Qiang , Kaliuzhny MYKOLA . Multi-component LFM interference suppression method based on chirp rate turning point and FrFT[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022 , 43(8) : 326840 -326840 . DOI: 10.7527/S1000-6893.2022.26840

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