常規(guī)雷達(dá)JEM特征分析與目標(biāo)分類的研究
Studies of analysis of JEM signatures and classificatioin of targets in the conventional radar
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摘要: 該文研究了常規(guī)雷達(dá)回波中噴氣發(fā)動(dòng)機(jī)調(diào)制(JEM)特征產(chǎn)生機(jī)理、提取方法及用于目標(biāo)分類的效能，先從理論上分析了常規(guī)雷達(dá)飛機(jī)回波中JEM特征的產(chǎn)生機(jī)理，并比較了直升機(jī)、螺旋槳飛機(jī)和渦扇噴氣機(jī)回波中JEM周期特征的差別。再討論了實(shí)際回波中時(shí)域、頻域、時(shí)頻域方法分析和提取JEM周期特征的優(yōu)劣，最后用AR雙譜切片技術(shù)提取的JEM周期特征進(jìn)行了目標(biāo)分類和辨識(shí)實(shí)驗(yàn)，結(jié)果表明：JEM周期特征用于常規(guī)防空雷達(dá)飛機(jī)的分類是有效的，但又是有限的。Abstract: Induction mechanism, extraction methods and classification efficiency of Jet En-gine Modulation (JEM) signatures in the aircraft returns of the conventional radar are studied in this paper. Firstly, induction mechanism of JEM signatures in the aircraft returns of the con-ventional radar is analyzed theoretically, and some differences of JEM signatures in the returns from different aircrafts including helicopter, propeller and turbojet are compared. Secondly, advantages and disadvantages of the analysis and extraction of JEM signatures are discussed in the time-domain, frequency-domain and time-frequency domain. Thirdly, a target classification and identification test is accomplished by using JEM periodic feature extracted by AR bispec-trum slice. The experimented results demonstrate that in target classification JEM periodic feature is effective but limited in the conventional radar.
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