基于GASA算法和调频函数的NLFM波形设计  

Design of Non-Linear Frequency Modulation Signal Waveform Based on GASA and Frequency Modulation Function

作　　者：覃春淼 孟凡利 翟恒峰 薛俊杰 徐光辉 QIN Chunmiao;MENG Fanli;ZHAI Hengfeng;XUE Junjie;XU Guanghui(Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China)

机构地区：[1]上海航天电子技术研究所

出　　处：《雷达科学与技术》2019年第6期679-683,688,共6页Radar Science and Technology

摘　　要：与线性调频信号相比,非线性调频信号无需加权就可以获得很低的距离旁瓣,而且没有信噪比损失,在脉压雷达中得到广泛的应用。一般地,设计非线性调频信号都采用基于相位逗留原理的窗函数法,但是设计的波形有很高的距离旁瓣。在分析了窗函数法设计非线性调频信号的基础上,根据一种新的调频函数数学模型,提出了一种用GASA算法来产生非线性调频信号的新方法,并给出了仿真实例,仿真验证了该算法的有效性。通过该方法获得了脉压后低副瓣的非线性调频信号,可以提高脉冲压缩性能。Compared with the LFM waveform,nonlinear frequency modulation signal can achieve very low range sidelobe without weighting and can avoid the signal to noise ratio loss.So it is widely used in the radar system which employed pulse compression.Generally,the general design method of NLFM signal waveform is based on the principle of stationary phase with the window function.But the waveform still has high range sidelobe.Based on the analysis of window method for design non-linear frequency modulation signal(NLFM),this paper proposes a new method to produce the NLFM signal using the GASA algorithm according to a new mathematic model of frequency module function.An example of simulation is also given in paper.The validity of method is demonstrated by the simulation result.The NLFM signal with low peak side-lobe(PSL)is obtained by using this new algorithm.Higher pulse compression performance can be attained by using such waveform.

关 键 词：非线性调频 峰值旁瓣电平 调频函数 遗传模拟退火算法 

分 类 号：TN957[电子电信—信号与信息处理]