線性伸縮波形的雷達距離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: 該文提出了任意信號的時域線性伸縮表達式，給出了一類新的雷達波形，并對這類波形的壓縮形式(匹配濾波輸出)在時域進行旁瓣抑制數(shù)字濾波。仿真結(jié)果表明，這類波形的距離模糊函數(shù)的峰值旁瓣電平可達-18~-20 dB，而4dB主瓣寬度僅為相同參數(shù)的線性調(diào)頻(LFM)壓縮信號主瓣寬度的54%~70%；對這類波形的匹配濾波輸出用該文改進的數(shù)字旁瓣抑制濾波器濾波后，其峰值旁瓣電平可低達-50dB，且主瓣寬度僅為單位采樣符號長度。
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關(guān)鍵詞:
- 雷達波形; 線性伸縮; 線性調(diào)頻; 模糊函數(shù); 旁瓣抑制
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. -
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, 桌榮邦, 楊士毅, 張金全譯. 現(xiàn)代雷達原理. 北京: 電子工業(yè)出版社, 1991: 482.[6]張直中. 雷達信號的選擇與處理. 北京: 國防工業(yè)出版社, 1979: 32-38. -
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