当光学系统口径一定时，在相同的轨道高度条件下，增大焦距可以提高地面分辨率，增大系统的视场角可以扩大对地面的覆盖宽度。
When the aperture diameter of an optical system is fixed with the same orbit height, the resolution of ground objects can be improved by increasing the focal length.
有源结构中以波导口径相控阵天线为例，将透明源技术与辅助场FDTD结合起来，并提出了一种分析三角形栅格阵列的方法。
Waveguide aperture phased array antenna is analyzed using the transparent source technique and the auxiliary fields FDTD. A method to calculate triangular lattice array is put forward.
超分辨谱估计技术可以在不增大天线口径的情况下提高米波雷达的方位角分辨力。
Azimuth resolution of meter wave radar can be improved by using super resolution spectrum estimation methods without extending the antenna aperture.
采用宽板小成型角生产小口径螺旋缝埋弧焊钢管时，内焊缝产生裂纹是经常遇到的问题。
Inside weld produced cracks are often faced problem by adopting wide coil with small forming Angle to produce small size spiral submerged welded pipe.
它具有体积小、重量轻、口径效率高、宽角副瓣低等特点。
It has the characteristics of the small volume, light weight, high aperture efficiency and low wide-angle minor lobe and so on.
它具有体积小、重量轻、口径效率高、宽角副瓣低等特点。
It has the characteristics of the small volume, light weight, high aperture efficiency and low wide-angle minor lobe and so on.
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