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首页> 外文期刊>Instrumentation and Measurement, IEEE Transactions on >Effect of Instrument Frequency Uncertainty on Wideband Microwave Synthetic Aperture Radar Images
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Effect of Instrument Frequency Uncertainty on Wideband Microwave Synthetic Aperture Radar Images

机译：仪器频率不确定度对宽带微波合成孔径雷达图像的影响

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摘要

In this paper, we investigate the effect of frequency uncertainty in signals generated or measured by a microwave instrument on the resulting synthetic aperture radar (SAR) images, particularly for nondestructive testing (NDT) applications. Wideband SAR imaging systems measure reflections from a target by irradiating it with locally generated signals that can potentially have some level of frequency uncertainty. Quantifying this frequency uncertainty provides the user with a realistic and expected level of image distortion which may manifest itself as blurring, noise artifacts, etc. In this paper, we show that as uncertainty in the actual frequency value increases, the level of image distortions increases predominantly for distant targets. This is an important fact for NDT applications since the imaged object is commonly close to the imaging system. In addition, these imaging system usually have a limited “aperture” size, which makes target distance an important consideration. For complex targets, we show how frequency uncertainty-based image distortions can dominate features in an image depending on the reflected signal amplitude from the target. We also show that in real imaging systems, the statistical distribution of frequency uncertainty combined with practical, near-target ranges (distances) produce nondiscernible image distortions.
机译：在本文中，我们研究了微波仪器产生或测量的信号中的频率不确定性对合成孔径雷达（SAR）图像的影响，特别是对于无损检测（NDT）应用。宽带SAR成像系统通过用目标产生的信号进行辐照来测量目标的反射，这些信号可能具有一定程度的频率不确定性。量化此频率不确定性可为用户提供逼真的和预期的图像失真水平，该水平可能表现为模糊，噪声伪影等。在本文中，我们表明，随着实际频率值的不确定性增加，图像失真水平也会增加主要用于远距离目标。对于NDT应用而言，这是一个重要的事实，因为被成像物体通常靠近成像系统。另外，这些成像系统通常具有有限的“孔径”大小，这使得目标距离成为重要考虑因素。对于复杂目标，我们展示了基于频率不确定性的图像失真如何根据来自目标的反射信号幅度来主导图像中的特征。我们还表明，在实际的成像系统中，频率不确定性的统计分布与实际的接近目标范围（距离）相结合会产生不可识别的图像失真。

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