air-or vehicle-borne ground penetrating synthetic aperture radar(gpsar) has the ability to detect subsurface objects over a large area from a standoff distance quickly.
提出运用时域有限差分方法结合傅里叶变换进行地表穿透合成孔径雷达浅地表目标电磁特征计算的方法。
within a standoff distance equal to about seven times of equivalent nozzle diameters, the jet centerline velocity of the star-shaped nozzle is lower than that of the round nozzle.