大转角条件下二维计算雷达像的改进

为提高转台目标成像时的横向分辨率,需增大转角,而增大转角会引起雷达像模糊。文中在频率空间的直角坐标系中用板块法仿真出大转角转台目标的雷达回波数据,然后用二维快速傅里叶变换对回波数据进行处理,从而获得转台目标的雷达像。经过对仿真数据进行验证,用该方法获得的二维雷达像,其质量高于用极坐标回波数据所成的像

Improvement of Calculated 2 D Radar Image for Large Rotating Angle

In rotating platform imaging in microwave anechoic chamber, it is necessary to increase the rotating angle in order to obtain high resolution. However large rotating angle results in out of focus of the obtained image. This paper deals with the imaging method of modeling radar echo data of an object on a rotating platform with panel method in the case of large rotating angles. The echo data are directly calculated in Cartesian coordinate system of spatial frequency and processed with two dimensional fast Fourier transform (2D FFT) to obtain the image of the object. By simulation, it is shown that the quality of the resulting image is much better than that of the image obtained using the data calculated in polar coordinate system.