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机载和天基合成孔径雷达系统通常设计成用于线性直向飞行路径。本文叙述采用转动天线的合成孔径雷达(ROSAR:转动合成孔径雷达)的可行性。ROSAR尤其适用于以直升飞机作运载平台的场合,以便飞行员实现目标探测和高分辨力目标定位。如天线安装在旋翼叶片的端部,则利用叶片的旋转运动来形成合成孔径。但是,这一原理适用于所有转动装置。当天线位于旋翼叶片的端部时,其斜视方向照射下方一个环形区域.这意味着ROSAR覆盖360°角范围。天线的转动从不同视角扫掠周围环境足以形成图象而无需变换运载平台上的运动分量。通过天线沿圆形路径的运动,信号处理是以旋转角的函数来实现的。当然,为了形成图象,采用了与常规合成孔径雷达常用的方法不同的其它算法。所显示目标的位置完全由径向距离和旋转角来确定。此外,还必须保留天线在旋转运动期间的位置,并标出每次新的转动.首次可行性研究仍然是采用理想圆形路径的.
Airborne and space-based synthetic aperture radar systems are often designed for linear straight-ahead flight paths. This article describes the feasibility of a synthetic aperture radar with a rotating antenna (ROSAR: Rotating Synthetic Aperture Radar). ROSAR is particularly suitable for use on helicopters as a platform for pilots to achieve target detection and high-resolution target positioning. If the antenna is mounted on the end of the rotor blade, the synthetic aperture is formed by the rotational movement of the blade. However, this principle applies to all rotating devices. When the antenna is at the end of the rotor blade, its squint direction illuminates a looped area, which means ROSAR covers a 360 ° angular range. Antenna rotation Sweeping the surroundings from different viewing angles is sufficient to create an image without the need to transform the motion components on the platform. Through the movement of the antenna along a circular path, the signal processing is done as a function of the angle of rotation. Of course, in order to form an image, other algorithms than those commonly used with conventional synthetic aperture radars are employed. The position of the displayed target is completely determined by the radial distance and rotation angle. In addition, the position of the antenna during rotational movement must be preserved and each new rotation must be marked. The first feasibility study is still using the ideal circular path.