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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Autofocus Correction of Phase Distortion Effects on SHARAD Echoes
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Autofocus Correction of Phase Distortion Effects on SHARAD Echoes

机译:对SHARAD回波的相位失真影响的自动聚焦校正

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摘要

SHARAD is a frequency-modulated (15–25 MHz) radar sounder that probes the upper few kilometers of the Martian crust and polar layered deposits. At solar zenith angles less than about 100 $^{circ}$, the ionosphere of Mars can induce phase distortion in surface and subsurface radar echoes that substantially degrades the signal-to-noise ratio and vertical resolution of the range-compressed data. We present a range-compression autofocus approach that estimates the phase distortion of SHARAD data along ground-track segments of about 100 km, using a power-law image-sharpness metric and an empirically derived scaling between the phase correction and radar frequency. This method is rapid, yields a greatly improved subsurface image, and provides a means to track regional and temporal changes in the Martian ionosphere.
机译:SHARAD是一种调频(15–25 MHz)雷达测深仪,探测火星地壳和极地分层沉积物的上方几公里。在太阳天顶角小于约100°C时,火星的电离层会在表面和地下雷达回波中引起相位失真,这将大大降低距离压缩数据的信噪比和垂直分辨率。我们提出了一种距离压缩自动对焦方法,该方法使用幂律图像清晰度度量和根据经验得出的相位校正和雷达频率之间的缩放比例,估算了沿地面轨迹段约100 km的SHARAD数据的相位失真。这种方法是快速的,产生了大大改善的地下图像,并提供了跟踪火星电离层区域和时间变化的手段。

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