【Key words】 high resolution range profile (HRRP)； scattering center model； aspect stability； Inverse Synthetic Aperture Radar (ISAR)； hovering helicopter；
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方位角不稳定性 azimuthal instability
Then, utilizing thelower boUnd foW4 the aspect stability of range profiles and itS dePendence on radarsignal wavelengh bandwidth and the target size are analyZed theoretically.
然后在这个函数关系式的指导下，对距离像的方位稳定性及其与雷达信号波长、带宽以及目标尺寸大小的关系进行了理论分析。
参考来源 - 基于高分辨距离像的雷达目标识别·2,447,543篇论文数据，部分数据来源于NoteExpress
翼剖面；机翼；翼面一个部件或平面，如机翼、螺旋桨叶、方向舵等，其形状或方位控制稳定性、方向、抬升、冲击或驱动。
A part or surface, such as a wing, propeller blade, or rudder, whose shape and orientation control stability, direction, lift, thrust, or propulsion.
目的：探讨腰椎上关节面方位及对腰段脊柱稳定性的影响。
Objective:To observe the orientational angle of articular surface of lumbar vertebra and study its significance in the stability of spine.
研究验证了方位效应的稳定性，发现了视空间工作记忆广度对空间情境模型更新的影响。
The results validated the direction effect in the process of spatial situation model updating, and found the influence of visuospatial WM span on the process of spatial situation model updating.
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