基于LFM子脉冲的宽带雷达目标回波模拟方法
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摘要
在宽带雷达目标回波信号的半实物计算中,需要同时满足实时性和仿真精度的要求。提出一种基于线性调频(linear frequency modulation,LFM)子脉冲的宽带雷达目标回波模拟方法,将LFM脉冲信号分成若干个窄带、短时线性调频子脉冲,通过计算各个子脉冲对应的目标回波信号,来重构全脉冲的宽带目标回波信号。采用这种方法可大幅度减少算法的运算量,显著降低了算法对硬件资源的要求,提高了算法的实时性。计算机仿真结果证明了方法的可行性并具有较高的计算精度。
In the hardware-in-the-loop calculation of the wideband radar target echo signal,the system needs to meet the requirements of real-time and simulation accuracy simultaneously.A method of wideband radar target echo signal simulation based on linear frequency modulation(LFM)sub-pulse is proposed,which divides the LFM pulse signal into several narrowband and short-term linear frequency modulation pulses,and reconstructs the broadband target echo signal of the full pulse by calculating the target echo signal which corresponds to each sub-pulse.The computational load and the requirement for the hardware resources of the algorithm can be efficiently reduced,thus the real-time performance of the algorithm is improved as well.The computer simulation demonstrates that this method is feasible and has high calculation accuracy.
In the hardware-in-the-loop calculation of the wideband radar target echo signal,the system needs to meet the requirements of real-time and simulation accuracy simultaneously.A method of wideband radar target echo signal simulation based on linear frequency modulation(LFM)sub-pulse is proposed,which divides the LFM pulse signal into several narrowband and short-term linear frequency modulation pulses,and reconstructs the broadband target echo signal of the full pulse by calculating the target echo signal which corresponds to each sub-pulse.The computational load and the requirement for the hardware resources of the algorithm can be efficiently reduced,thus the real-time performance of the algorithm is improved as well.The computer simulation demonstrates that this method is feasible and has high calculation accuracy.
引文
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[16]郭尊华,李达,张伯彦.雷达高距离分辨率一维像目标识别[J].系统工程与电子技术,2013,35(1):53-60.GUO Z H,LI D,ZHANG B Y.Survey of radar target recognition using one-dimensional high range resolution profiles[J].Systems Engineering and Electronics,2013,35(1):53-60.
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[2]徐雪菲,廖桂生.高超声速目标雷达回波脉内运动模型[J].系统工程与电子技术,2015,37(3):537-543.XU X F,LIAO G H.IPM model for radar echo signal of hypersonic targets[J].Systems Engineering and Electronics,2015,37(3):537-543.
[3]CUMMING I G,WONG F H.Digital processing of synthetic aperture radar data:algorithms and implementation[M].USA:Artech House,2005.
[4]BHALLA R,LING H.A fast algorithm for signature prediction and image formation using the shooting and bouncing ray technique[J].IEEE Trans.on Antennas and Propagation,1995,43(7):727-731.
[5]BHALLA R,LING H.ISAR image simulation of targets with moving parts using the shooting and bouncing ray technique[C]∥Proc.of the Antennas and Propagation Society International Symposium,1994:1994-1997.
[6]高磊,陈曾平,黄小红.基于压缩感知的宽带成像雷达Chirp信号回波的压缩和重构[J].信号处理,2010,26(11):1670-1676.GAO L,CHEN Z P,HUANG X H.Compression and reconstruction of chirp echo of broad-band imaging radar based on compressed sensing[J].Journal of Signal Processing,2010,26(11):1670-1676.
[7]苏亮又,柏业超,张兴敢,等.基于协方差准则迭代估计的雷达回波压缩重构[J].南京大学学报(自然科学版),2015,51(1):31-36.SU L Y,BAI Y C,ZHANG X G,et al.Compression and reconstruction of radar echo based on sparse iterative covariancebased estimation[J].Journal of Nanjing University(Natural Sciences),2015,51(1):31-36.
[8]李尚生,张军,陈佳林.DRFM在高度信号模拟中的应用及关键技术研究[J].宇航计测技术,2013,33(5):9-11.LI S S,ZHANG J,CHEN J L.Research on the key technologies for applications of DRFM in simulating altitude signal[J].Journal of Astronautic Metrology and Measurement,2013,33(5):9-11.
[9]刘魁,颜学龙,关世友,等.基于FPGA雷达多目标模拟器DRFM设计与实现[J].电子技术应用,2011,37(5):52-55.LIU K,YAN X L,GUAN S Y,et al.DRFM design for radar multi-target simulator based on FPGA[J].Application of Electronic Technique,2011,37(5):52-55.
[10]肖汉波,张长青.基于宽带DRFM的雷达面目标回波模拟技术[J].电讯技术,2015,55(12):1378-1383.XIAO H B,ZHANG C H.Radar surface target echo simulation technology based on wideband DRFM[J].Telecommunication Engineering,2015,55(12):1378-1383.
[11]王菁,周建江.一种基于GTD模型的目标散射中心提取方法[J].系统工程与电子技术,2008,30(11):2146-2150.WANG J,ZHOU J J.Method of scattering center extraction based on GTD model[J].Systems Engineering and Electronics,2008,30(11):2146-2150.
[12]POTTER L C,CHIANG D M,CARRIERE R,et al.A GTDbased parametric model for radar scattering[J].IEEE Trans.on Antennas and Propagation,1995,43(10):1058-1067.
[13]王菁,周建江,廖启新.基于全极化GTD模型的雷达目标二维散射中心提取[J].系统工程与电子技术,2011,33(12):2643-2648.WANG J,ZHOU J J,LIAO Q X.Extraction of 2Dscattering centers of radar targets based on full polarization GTD model[J].Systems Engineering and Electronics,2011,33(12):2643-2648.
[14]ROY R,KAILATH T.ESPRIT-estimation of signal parameters via rotational invarance techniques[J].IEEE Trans.on Acoustics,Speech and Signal Processing,1989,37(7):984-995.
[15]王菁.光学区雷达目标散射中心提取及其应用研究[D].南京:南京航空航天大学,2010.WANG J.A study on radar optical region target scattering center extraction and its applications[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2010.
[16]郭尊华,李达,张伯彦.雷达高距离分辨率一维像目标识别[J].系统工程与电子技术,2013,35(1):53-60.GUO Z H,LI D,ZHANG B Y.Survey of radar target recognition using one-dimensional high range resolution profiles[J].Systems Engineering and Electronics,2013,35(1):53-60.
[17]LI H J,WANG Y D,WANG L H.Matching score properties between range profiles of high-resolution radar targets[J].IEEE Trans.on Antennas and Propagation,1996,44(4):444-452.