基于相位函数构造法的低旁瓣NLFM波形设计  

The Low-sidelobes NLFM Signal Based on the Phase Function Construction

作　　者：罗沅 孙浩越 黄勇 魏广芬[1] LUO Yuan;SUN Haoyue;HUANG Yong;WEI Guangfen(Shandong Technology and Business University,Yantai,Shandong 264005;Naval Aviation University,Yantai,Shandong 264001)

机构地区：[1]山东工商学院,山东烟台264005 [2]中国人民解放军海军航空大学,山东烟台264001

出　　处：《火控雷达技术》2024年第3期1-9,共9页Fire Control Radar Technology

基　　金：山东省自然科学基金(ZR2021QF049)。

摘　　要：波形设计是信号处理领域的重要课题,降低旁瓣是雷达波形设计的研究重点。一般设计NLFM信号都采用基于驻定相位原理的窗函数法,但是设计的波形有很高的旁瓣。为降低旁瓣,通过对比不同窗函数生成的相位函数总结出低旁瓣NLFM信号相位函数的规律,进而提出一种相位函数构造法用于设计低旁瓣NLFM信号,使相位函数有显式表达式,摆脱了传统NLFM信号依赖窗函数生成而导致的计算公式复杂、拟合误差大和旁瓣高等限制。最后通过仿真与多种改进NLFM信号设计方法进行对比,分析其主副瓣比与对多普勒效应的容忍性。仿真结果表明,此方法设计的NLFM信号可在不损失SNR的条件下使主副瓣比达到-60dB以下,且对多普勒效应的容忍性较好。Waveform design is an important topic in the field of signal processing,and the reduction of sidelobes is the research focus of radar waveform design.Generally,the design method of NLFM(non-linear frequency modulation)signal is based on the principle of stationary phase with the window function,but the side lobes of the signal designed by this method still have pronounced height.In order to reduce the sidelobes,the phase function of low sidelobe NLFM signals was summarized by comparing the phase functions generated by different window functions,and then a method which was based on constructingthe phase function was proposed for the design of low sidelobes NLFM signals,so that the phase function had an explicit expression,which got rid of the complex calculation formula,large fitting error and high sidelobes limitations caused by relying on the generation of the window function for the traditional NLFM signals.Finally,the mainlobe peak to sidelobe peak ratio and tolerance to the Doppler effect were analyzed by simulation in comparison with those of several improved NLFM signal design methods.The simulation results showed that the NLFM signal which was designed by this method can achieve a mainlobe peak to sidelobe peak ratio below-60 dB without loss of SNR,and exhibited good tolerance to the Doppler effect.

关 键 词：波形设计 NLFM信号 相位函数 低旁瓣 

分 类 号：TN95[电子电信—信号与信息处理]