Abstract:

The airborne synthetic aperture radar（SAR） system realizes the large azimuth width by scanning. The scanning angular velocity is restricted by azimuth resolution， squint angle and other parameters. It is a difficult problem to design and implement airborne wide-width azimuth scanning SAR with both scanning efficiency and azimuth resolution. In order to realize azimuth wide-swath scanning in the air route， a beam control method is proposed. By deriving the scanning angle change rule between different scene images， and designing the start scanning angle and end scanning angle of each scene image according to the angle change rule， the designed beam control method can meet the resolution requirements of the scanning angle velocity of each scene image and has a time-varying angular velocity with a high scanning efficiency. Overlapping between scenes to ensure coverage and the target scene is located in the middle of the scanning width in the course.

Key words: airborne, synthetic aperture radar（SAR）, azimuth, scan, wide swath

摘要：

机载SAR系统通过扫描实现方位大幅宽，扫描角速度受方位分辨率、斜视角等参数制约,扫描效率和方位分辨率难以同时兼顾成为机载方位宽幅扫描SAR设计和实现中的难题。为了实现航线内方位宽幅扫描，提出了一种波束控制方法，通过推导得到不同帧图像间扫描角度变化规律，根据角度变化规律设计各帧图像的起始扫描角和终止扫描角，设计的波束控制方法对各景图像扫描角速度满足分辨率要求，并且时变角速度具有高的扫描效率，景与景之间重叠保证覆盖，目标场景位于航线内扫描幅宽中间。

关键词: 机载, 合成孔径雷达, 方位, 扫描, 大幅宽