常规雷达JEM特征分析与目标分类的研究

该文研究了常规雷达回波中喷气发动机调制(JEM)特征产生机理、提取方法及用于目标分类的效能，先从理论上分析了常规雷达飞机回波中JEM特征的产生机理，并比较了直升机、螺旋桨飞机和涡扇喷气机回波中JEM周期特征的差别。再讨论了实际回波中时域、频域、时频域方法分析和提取JEM周期特征的优劣，最后用AR双谱切片技术提取的JEM周期特征进行了目标分类和辨识实验，结果表明：JEM周期特征用于常规防空雷达飞机的分类是有效的，但又是有限的。

Studies of analysis of JEM signatures and classificatioin of targets in the conventional radar

Induction mechanism, extraction methods and classification efficiency of Jet Engine 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 conventional 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.