In this paper, a synthetic aperture radar (SAR) image formation simulator is used to objectively evaluate the parameter selection within the digital spotlighting process. Specifically, recommendations for the filter type and filter order of the low-pass filters used in the range and azimuth decimation processes within the digital spotlighting algorithm are determined to maximize image quality and minimize computational cost. Results show that a finite impulse response low-pass filter with a Taylor \((\overline {n}=5)\) window applied provides the highest image quality over a wide range of filter orders and decimation factors. Additionally, a linear relationship between filter length and decimation factor is found.

中文翻译：

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SAR成像的数字聚光滤波优化

在本文中，使用合成孔径雷达（SAR）图像形成模拟器来客观地评估数字聚光灯过程中的参数选择。具体而言，确定在数字聚光算法中的范围和方位角抽取过程中使用的低通滤波器的滤波器类型和滤波器阶数的建议，以使图像质量最大化并使计算成本最小化。结果表明，应用泰勒\（（\ overline {n} = 5）\）窗口的有限冲激响应低通滤波器可在各种滤波器阶次和抽取因子下提供最高的图像质量。另外，找到了滤波器长度和抽取因子之间的线性关系。