两维FFT和VD-DPT算法结合的LFM信号参数估计方法

庞存锁; 苏灿生; 张硕

doi:10.15892/j.cnki.djzdxb.2023.03.002

弹箭与制导学报 >

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

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

两维FFT和VD-DPT算法结合的LFM信号参数估计方法

庞存锁 ¹^,²^,³ ,
苏灿生 ¹ ,
张硕 ¹^,²

展开

¹ 中北大学信息与通信工程学院,山西太原 030051
² 中北大学信息探测与处理山西省重点实验室,山西太原 030051
³ 中北大学电子测试技术国家重点实验室,山西太原 030051

庞存锁(1978—),男,副教授,博士,研究方向:雷达信号处理。

收稿日期: 2022-08-02

网络出版日期: 2025-02-07

基金资助

山西省自然科学基金(20210302123057)

收起

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

Expand

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

Fold

摘要

针对低信噪比下长序列LFM信号参数估计方法存在运算量大,实时性差的问题,提出了基于两维傅里叶变换(FFT)和变时延离散多项式相位变换(VD-DPT)相结合的LFM信号参数估计方法。该方法首先将一维长序列信号进行分解并组合成两维数组;其次,利用VD-DPT算法对调频率参数进行初步估计,并以此为基础利用解线性调频变换(Dechirp)对两维数组进行最大值寻优处理。数值仿真表明:所提方法较传统DPT方法信噪比提高约2~3 dB,复乘运算量在调频率较大时,较Dechirp方法降低约1个数量级以上,具有明显的运算速度优势。该方法也可应用于高机动微弱目标的雷达检测系统。

关键词： 线性调频信号; 两维FFT; 变延时DPT变换; 运算效率

本文引用格式

庞存锁 , 苏灿生 , 张硕 . 两维FFT和VD-DPT算法结合的LFM信号参数估计方法[J]. 弹箭与制导学报, 2023 , 43(3) : 9 -15 . DOI: 10.15892/j.cnki.djzdxb.2023.03.002

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

[an error occurred while processing this directive]

参考文献

原文顺序 | 文献年度倒序 | 文中引用次数倒序

[1]	冯志成, 安建平, 卫景宠. FRFT域LFM信号的调频率分辨率与相位差的关系[J]. 系统工程与电子技术, 2011, 33(10): 2194-2197. FENG Z C, AN J P, WEI J C. Relationship between chirp-rate resolution of LFM signals and phase difference in FRFT domain[J]. Systems Engineering and Electronics, 2011, 33(10): 2194-2197. DOI

[2]	廖烨, 刘国峰, 李康, 等. 基于相位差法和FRFT的Chirp信号参数估计算法[J]. 光通信研究, 2020(3): 73-78. LIAO Y, LIU G F, LI K, et al. Chirp singnal parameter estimation using phase differcnce method and frantional fourier transforms[J]. Study on Optical Communications, 2020(3): 73-78.

[3]	江莉, 周军妮, 杨润玲, 等. 利用改进SM的LFMCW信号参数估计算法[J]. 系统仿真学报, 2018, 30(9): 3283-3287. DOI JIANG L, ZHOU J N, YANG R L, et al. Parameter estimation of LFMCW signals based on improved SM method[J]. Journal of System Simulation, 2018, 30(9): 3283-3287. DOI

[4]	宋耀辉, 黄仰超, 张衡阳, 等. 基于FRFT的多分量LFM信号检测与参数估计方法[J]. 北京航空航天大学学报, 2020, 46(6): 1221-1228. SONG Y H, HUANG Y C, ZHANG H Y, et al. Multicomponent LFM signal detection and parameter estimation method based on FRFT[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(6): 1221-1228.

[5]	李燕, 何怡刚, 尹柏强. LFM信号DOA估计分数阶量纲归一化方法[J]. 电子测量与仪器学报, 2016, 30(3): 448-455. LI Y, HE Y G, YIN B Q. DOA estimation for LFM signals using FRFT dimensional normalization methods[J]. Journal of Electronic Measurement and Instrumentation, 2016, 30(3): 448-455.

[6]	ALDIMASHKI O, SERBES A. Performance of chirp parameter estimation in the fractional fourier domains and an algorithm for fast chirp-rate estimation[J]. IEEE Transactions on Aerospace and Electronic Systems, 2020, 56(5): 3685-3700.

[7]	刘国峰, 李康, 廖烨, 等. 基于改进精估计与FRFT的Chirp信号参数估计[J]. 电讯技术, 2020, 60(9): 1080-1086. LI G F, LI K, LIAO Y, et al. Chirp signal parameter estimation based on improved accurate estimation and FRFT[J]. Telecommunication Engineering, 2020, 60(9): 1080-1086.

[8]	庞存锁. 基于离散多项式相位变换和分数阶傅里叶变换的加速目标检测算法[J]. 电子学报, 2012, 40(1): 184-188. DOI PANG C S. An accelerating target detection algorithm based on DPT and fractional fourier transform[J]. Acta Electronica Sinica, 2012, 40(1): 184-188.

[9]	PANG C S, SHAN T, TAO R, et al. Detection of high-speed and accelerated target based on the linear frequency modulation radar[J]. IET Radar, Sonar Navigation, 2014, 8(1): 37-47.

[10]	BAI G, TANG W. Chirp rate estimation for LFM signal by multiple DPT and weighted combination[J]. IEEE Signal Processing Letters, 2018, 26(1): 149-153.

[11]	庞存锁, 曲喜强, 郭华玲. 基于分段处理的线性频率调制信号检测方法[J]. 探测与控制学报, 2016, 38(2): 60-63. PANG C S, QU X Q, GUO H L. LFM signal detection method based segmentation processing[J]. Journal of Eetection Control, 2016, 38(2): 60-63.

[12]	熊竹林, 刘策伦, 安建平. 一种低复杂度线性调频信号参数估计算法[J]. 电子与信息学报, 2015, 37(2): 489-493. XIONG Z L, LIU C L, AN J P. A low complexity parameter estimation algorithm of LFM signals[J]. Journal of Electronics & Information Technology, 2015, 37(2): 489-493.

[13]	刘勇, 张国毅, 张旭洲. 低信噪比下LFMCW信号的参数估计[J]. 电子信息对抗技术, 2014, 29(6): 28-33. LIU Y, ZHANG G Y, ZHANG X Z. Parameter estimation of LFMCW signal at low SNR[J]. Electronic Information Warfare Technology, 2014, 29(6): 28-33.

[14]	张哲, 赵健博. 基于LVD与Zoom-FRFT的多分量LFM信号参数估计[J]. 应用科技, 2020, 47(5): 53-57. ZHANG Z, ZHAO J B. Parameter estimation of multicomponent LFM signal based on LVD and Zoom-FRFT[J]. Applied Science and Technology, 2020, 47(5): 53-57.

[15]	WANG Y. LFM signal analysis based on improved Lv distribution[J]. IEEE Access, 2019, 7: 169038-169046. DOI

[16]	陈旭敏, 王晓江, 潘韵天, 郑国莘. 恒虚警条件下线性调频连续波雷达信号的检测[J]. 电子测量技术, 2016, 39(12): 98-103. CHEN X M, WANG X J, PAN Y T, et al. LFMCW radar signal detection under the condition of cfar[J]. Electronic Measurement Technology, 2016, 39(12): 98-103.

Options

文章导航