圆周合成孔径雷达投影共焦三维成像算法

针对圆周合成孔径雷达成像模式下应用共焦三维成像算法成像效率低的问题,提出了投影共焦三维成像算法.该算法利用圆周合成孔径雷达成像模式下成像区域较小时高度向与水平面相对较弱的耦舍性,将共焦三维成像算法中的三维空变滤波转化为水平面内的二雏空变滤波和高度向时域平移,从而化三维成像的三雏处理为二维处理,以提高算法的成像效率.通过引进天线远场条件作为成像区域较小的判定标准,定量分析了算法的适用条件.仿真结果验证了该算法较高的成像效率及算法适用条件的有效性.

Projected confocal 3-D imaging algorithm for circular SAR

Aiming at the inefficiency of confocal 3-D imaging algorithm(CIA) for circular SAR,the projected CIA(PCIA) is proposed.The efficiency is enhanced via the transformation of the 3-D space variant filtering contained in CIA to 2-D space variant filtering followed by a linear shifting in vertical direction,which is feasible because of the weak coupling between the vertical direction and the horizontal plane,especially for small scale imaging area.The applicable condition of PCIA is presented based on the adoption of the satisfactory of far field condition as the standard of small scale imaging area.The higher efficiency of PCIA than CIA and the validity of the applicable condition of PCIA are verified by numerical simulation results.