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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Zero-Doppler Centroid Steering for the Moon-Based Synthetic Aperture Radar: A Theoretical Analysis
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Zero-Doppler Centroid Steering for the Moon-Based Synthetic Aperture Radar: A Theoretical Analysis

机译：用于月亮的合成孔径雷达的零多普勒质心转向：理论分析

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摘要

Due to the earth and moon's revolutions, the Doppler centroid of the moon-based synthetic aperture radar (moon-based SAR) varies dramatically along the orbit of the moon when the SAR system is looking broadside (nonsquinted). However, the Doppler centroid should be kept as small as possible to avoid range ambiguity and to alleviate difficulty with focus. This letter presents the Doppler properties along the orbit of the moon in accordance with the antenna coordinate system. Based on the Doppler analysis and the phase scan, we propose a method for Doppler centroid steering to minimize the Doppler centroid frequency without rotating the platform. The new method can accurately compensate the Doppler centroid to zero, because it considers the effects of the lunar orbit and the relative motion between earth's target and moon-based SAR. To validate the proposed method, we also derived the lower and upper bounds of the look angle. Subsequently, we performed simulations in accordance with Jet Propulsion Laboratory Development Ephemeris 430 (JPL DE430). Finally, the performance requirement of the phase scan is analyzed so as to validate the proposed method.
机译：由于地球和月亮的旋转，当SAR系统看宽边（非金色）时，月亮的合成孔径雷达（基于月亮的SAR）的多普勒质心沿着月球的轨道变化。然而，多普勒质心应尽可能小，以避免范围歧义，并减轻焦点难度。根据天线坐标系，这封信呈沿着月球轨道的多普勒属性。基于多普勒分析和相位扫描，我们提出了一种用于多普勒质心转向的方法，以最大限度地减少多普勒质心频率而不旋转平台。新方法可以准确地补偿多普勒质心归零，因为它考虑了月球轨道的影响和地球目标和基于月亮的SAR之间的相对运动。为了验证所提出的方法，我们还导出了看起来的下限和上限。随后，我们根据喷射推进实验室开发星历430进行模拟（JPL DE430）。最后，分析了相扫描的性能要求以验证所提出的方法。

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