可重构非线性调频信号的设计与实现  

Design and Implementation of Reconfigurable NLFM signal

作　　者：范欢欢 伍小保[1] 孙维佳 Fan Huanhuan;Wu Xiaobao;Sun Weijia(The No.38 Research Institute of CETC,Hefei 230088,China)

机构地区：[1]中国电子科技集团公司第三十八研究所

出　　处：《信息通信》2019年第9期22-24,共3页Information & Communications

摘　　要：与线性调频信号相比,非线性调频信号的频谱更接近理想的窗函数。其由匹配滤波器经过脉冲压缩处理后,无需进行加权处理就可以得到很高主副瓣比的脉冲压缩信号,同时不会降低系统的信噪比,因此能满足对输出信号信噪比要求很高的雷达系统的需求。文章首先介绍了非线性调频信号的设计思想;其次在Matlab软件平台针对不同窗函数实现的非线性调频信号进行仿真;最后在FPGA中采用泰勒窗函数设计实现了非线性调频信号,并在硬件上进行测试和验证。结果表明,采用泰勒窗函数实现的非线性调频信号的脉冲压缩后主副瓣比达到42dB。Compared with linear frequency modulation(LFM)signal,non-linear frequency modulation(NLFM)signal’s frequency spectrumis more like the ideal windowfunction.It can obtain the lower side lobe without weighted processing after pulse compression and will not decrease the system’s signal to noise ratio(SNR).So it meets the need of the radar system which needs the higher SNR.This paper first introduces the NLFMsignal’s design idea and then gives the simulation of NLFMsignal’s implementation with different window functions using Matlab.Finally,the detailed implementation in field programming gate array(FPGA)and the test results are given.TheDPCresult forNLFMsignal implemented by TaylorWindowfunction is 42dB。

关 键 词：现场可编程门阵列 非线性调频 线性调频 直接数字频率合成 脉冲压缩 

分 类 号：TN952[电子电信—信号与信息处理]