Parameter Estimation of LFM Signal Based on Two Dimensional FFT and VD-DPT Algorithm

PANG Cunsuo; SU Cansheng; ZHANG Shuo

doi:10.15892/j.cnki.djzdxb.2023.03.002

Journal of Projectiles, Rockets, Missiles and Guidance >

2023 , Vol. 43 >Issue 3: 9 - 15

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2023.03.002

Parameter Estimation of LFM Signal Based on Two Dimensional FFT and VD-DPT Algorithm

PANG Cunsuo ¹^,²^,³ ,
SU Cansheng ¹ ,
ZHANG Shuo ¹^,²

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¹ School of Information and Communication Engineering,North University of China,Taiyuan 030051,Shanxi, China
² Key Laboratory of Information Detection and Processing in Shanxi Province,North University of China,Taiyuan 030051, Shanxi, China
³ National Key Laboratory of Electronic Measurement Technology, North University of China,Taiyuan 030051, Shanxi, China

Received date: 2022-08-02

Online published: 2025-02-07

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Abstract

Aiming at the problem of large computation and poor real-time performance of parameter estimation method for long sequence LFM signal under low signal-to-noise ratio, a parameter estimation method for LFM signal based on two-dimensional Fourier transform and variable delay discrete polynomial phase transform is proposed. Firstly, one-dimensional long sequence signal is decomposed and converted into two-dimensional array; secondly, variable delay DPT algorithm is used to preliminarily estimate modulation frequency parameters, and on this basis, dechirp transform is used to find the maximum value of two-dimensional array excellent treatment. Finally, Numerical simulation results show that the proposed method improves the SNR by 2~3 dB compared with the traditional DPT method, and the complexity of complex multiplication is more than one order of magnitude higher than the dechirp method when the frequency modulation rate is large.This method can also be applied to radar detection system of high maneuvering weak target.

Key words： LFM; two-dimensional FFT; variable delay-DPT(VD-DPT); operation efficiency

Cite this article

PANG Cunsuo , SU Cansheng , ZHANG Shuo . Parameter Estimation of LFM Signal Based on Two Dimensional FFT and VD-DPT Algorithm[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2023 , 43(3) : 9 -15 . DOI: 10.15892/j.cnki.djzdxb.2023.03.002

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