天线方向图未知的机载SAR图像增强

Enhancement of Airborne SAR Images without Antenna Pattern

为了减弱雷达天线方向图和作用距离对SAR成像质量的影响,提高天线方向图未知情况下的机载SAR图像可视化效果和判读特性,提出利用方位向强度积分计算增强因子的SAR图像增强方法。该方法沿方位向对SAR图像各距离处的强度值进行积分,根据积分结果计算距离向增强因子并进行增强处理,从而减弱雷达天线方向图和作用距离对SAR成像强度的影响,得到沿距离向色调一致的SAR图像。采用机载SAR图像进行了增强试验,得到了满意的增强效果,验证了该方法的有效性。

In order to reduce the influence of antenna pattern and range to SAR imaging, and to improve the visualization and explanation without antenna pattern, an enhancement algorithm for SAR images with intensity integral in azimuth to calculate factors was proposed. In this algorithm, the intensities in different ranges were integral along azimuth, and the enhancement factors in range were calculated with the integral data to enhance SAR images. It can reduce the influence of antenna pattern and range, and can get SAR images with consistent tone in range. Airborne SAR images were implied in experiments. The satisfying results were got, as validated the proposed algorithm.