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研究通过天线波束扫描扩大 SAR区域成像范围的方法 ,以适应较大区域中等分辨率成像的要求。推导了天线扫描角速度、角度范围与所需成像范围和方位分辨率的关系。选择天线扫描角速度 ,使得在一个合成孔径时间内 ,波束恰好扫过 3分贝波束宽度 ,而合成孔径长度由要求的方位分辨率、波长、斜距和斜视角决定。天线扫描角度范围由要求的成像区方位宽度、斜距、斜视角、载机速度和波束方位宽度决定。最后 ,介绍了某机载 SAR试飞得到的成像结果。在运动补偿之后 ,采用线性距离多普勒算法成像
The method of expanding the imaging range of SAR region by antenna beam scanning is studied to meet the requirement of medium-resolution imaging in a large area. The relationship between the scanning angular velocity of the antenna, the range of the angle and the required imaging range and azimuth resolution is derived. The antenna sweep angular velocity is chosen such that the beam sweeps just over 3 dB beamwidth over a single synthetic aperture time, which is determined by the required azimuth resolution, wavelength, slant range, and squint angle. Antenna scanning angle range required by the imaging area of the azimuth width, slant range, oblique angle, carrier speed and beam azimuth width of the decision. Finally, the imaging results of some airborne SAR flight tests are introduced. After motion compensation, linear distance Doppler imaging was used