线性伸缩波形的雷达距离模糊特性及旁瓣抑制
Radar Range Ambiguity Performance and Sidelobe Suppression of Linear Contracting Waveform
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摘要: 该文提出了任意信号的时域线性伸缩表达式，给出了一类新的雷达波形，并对这类波形的压缩形式(匹配滤波输出)在时域进行旁瓣抑制数字滤波。仿真结果表明，这类波形的距离模糊函数的峰值旁瓣电平可达-18~-20 dB，而4dB主瓣宽度仅为相同参数的线性调频(LFM)压缩信号主瓣宽度的54%~70%；对这类波形的匹配滤波输出用该文改进的数字旁瓣抑制滤波器滤波后，其峰值旁瓣电平可低达-50dB，且主瓣宽度仅为单位采样符号长度。Abstract: A new type of radar waveform called Linear Contracting Waveform is presented. To suppress the sidelobe of such waveforms matched output , a digital filter is adopted. The simulation results show that , for the range ambiguity function of such waveform, the peak sidelobe is -18~-20dB,and the 4dB mainlobe width is only 54~70 percent of that of the linear frequency modulated (LFM) signal with the same parameters. Filtering the compressed form of such waveform by the improved digital sidelobe suppression filter, the output signals peak sidelobe level is as low as -50dB, and the mainlobe width is only unit sample length.
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Klouder J R, Price A C, Darlington S, Albersheim W J. The theory and design of chirp radars. Bell Syst. Tech. J., 1960, 39(4): 745-809.[2]Cook C E .[J].Bernfeld M. Radar SignalsAn Introduction to Theory and Applications. New York: Academic Press.1967,:-[3]Jeffrey S Fu , Xin Wu. Sidelobe suppression using adaptive filter techniques. CIE International Conference of Radar Proceedings, 2001: 788-791.[4]Haykin S. Adaptive Filter Theory, Fourth Edition. Beijing: Publishing House of Electronics Industry, 2002, chapter 9.[5]Eaves J L, Reedy E K 著, 桌荣邦, 杨士毅, 张金全译. 现代雷达原理. 北京: 电子工业出版社, 1991: 482.[6]张直中. 雷达信号的选择与处理. 北京: 国防工业出版社, 1979: 32-38. -
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