| 基于Lorenz混沌的MIMO雷达信号设计及性能分析 |
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| 引用本文： | 张民,李宗浩,高明.基于Lorenz混沌的MIMO雷达信号设计及性能分析[J].系统工程与电子技术,2018,40(1):58-64. |
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| 作者姓名： | 张民 李宗浩 高明 |
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| 作者单位： | 西安电子科技大学物理与光电工程学院, 陕西 西安 710071 |
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| 摘 要： | 多输入多输出(multiple input multiple output, MIMO)雷达研制中的一项关键内容便是提高所发射信号的正交性能,离散频率编码波形(discrete frequency coded waveform, DFCW)信号是一种常见的MIMO雷达信号,但其自相关旁瓣峰值(autocorrelation sidelobe peak, ASP)一般较高,约为0.21(-13.6dB),不利于微弱目标检测。通过Lorenz混沌系统构造离散频率编码序列,并将DFCW的子脉冲内部构造为线性调频(linear frequency modulation, LFM)信号,使其自相关性能相较于DFCW信号明显提升。在此基础上,采用脉间分集方法不仅使其抗截获和抗干扰能力提高,而且在多脉冲压缩积累后的输出结果具有更低的旁瓣峰值,从而提高检测性能。
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Design and performance of MIMO radar signal based on Lorenz chaos |
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| ZHANG Min,LI Zonghao,GAO Ming.Design and performance of MIMO radar signal based on Lorenz chaos[J].System Engineering and Electronics,2018,40(1):58-64. |
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| Authors: | ZHANG Min LI Zonghao GAO Ming |
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| Institution: | School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China |
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| Abstract: | The orthogonal performance of the transmitted signal is the key to realize the multiple input multiple output (MIMO) radar. Discrete frequency coding waveform (DFCW) is a common MIMO radar signal, but it is not conducive to weak target detection because of its high autocorrelation sidelobe peak (ASP), which is about 0.21 or -13.6 dB. Lorenz chaotic system is used to construct the discrete frequency coding sequence, and the fixed frequency pulses is replaced by linear frequency modulated (LFM) pulses, which makes the autocorrelation performance significantly improved compared with the DFCW. Finally, the inter pulse diversity method is used to improve the anti interception ability and the anti interference ability, and lower the ASP after multi pulse compression. |
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