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直升机区别于其它目标的最大特点就是它具有大而长的旋翼，研究、分析悬停直升机目标的旋翼回波特性，为研究悬停直升机目标的检测方法打下基础。
The distinguishing feature of a helicopter from other targets is that it has a large and long rotor. The study and analysis of rotor echo characteristics of a hovering helicopter target lay a foundation for the research on the detection method of a hovering helicopter target.