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为了从防空雷达实际回波中提取可识别的喷气发动机调制(JEM)特征,建立了适用于防空雷达实际的JEM参数模型。在理想螺旋桨飞机JEM模型的基础上,讨论了实际螺旋桨飞机结构和飞行姿态对JEM特征的影响和防空雷达有关参数对JEM特征的限制,并用实际螺旋桨飞机和防空雷达参数对该模型进行了仿真分析,再通过分析不同飞行姿态螺旋桨飞机实际回波的JEM特征验证了该模型。结果表明:JEM周期特征只取决于桨叶数量和转速,能可靠地从防空雷达回波中提取出来,而JEM其它特征与飞机结构、飞行姿态和雷达参数有较复杂的关系。
In order to extract identifiable JEM features from the actual echo of the air defense radar, a practical JEM parameter model suitable for air defense radar was established. On the basis of JEM model of ideal propeller aircraft, the influence of actual propeller aircraft structure and attitude on JEM characteristics and the limitation of JEM characteristics on relevant parameters of air defense radar are discussed. The model is simulated by actual propeller aircraft and air defense radar parameters The model is verified by analyzing the JEM characteristics of the actual echoes of different flight attitude propeller aircraft. The results show that the characteristics of JEM cycle depend only on the number of blades and rotational speed and can be extracted reliably from the radar airwaves. However, other characteristics of JEM have more complicated relations with aircraft structure, flight attitude and radar parameters.