联合相位校正技术在双基雷达月球成像的应用
Application of Combined Phase Correction Technique in LunarImaging Based on Bi-SAR
俞开斌 1李明辉 1赵荣坤 1尹岩 2牛向华 3孙京海 3黄丽佳2
作者信息
- 1. 贵州大学 省部共建公共大数据国家重点实验室，贵阳 550025
- 2. 目标认知与应用技术重点实验室，北京 100190;中国科学院 航天信息研究所，北京 100094;中国科学院大学 电子电气与通信工程学院，北京 100049
- 3. 中国科学院国家天文台，北京 100101;贵州射电天文台，贵阳 550025
- 折叠
摘要
随着采用雷达天文学技术开展行星成像研究的发展，具备高灵敏度的 500 m 口径球面射电望远镜（Five Hundred Meter Aperture Spherical Radio Telescope，简称 FAST）也开展了月球雷达成像的相关研究。基于由三亚非相干散射雷达（Sanya Incoherent Scatter Radar, SYISR）和FAST 组成的双地基雷达系统，采用包络对齐和相位校正方法，修正月地间相对运动带来的雷达回波间的误差。由于 FAST 具有高灵敏度，并且雷达回波的信噪比高，因此包络对齐仅采用曲线拟合技术就基本可以满足需求。在相位校正方面，为了提高精度并降低时间消耗，提出采用相位梯度自聚焦算法与最小熵自聚焦算法相结合的方法。实验证明，此方法可有效提高月球图像对比度，降低图片熵值。
Abstract
With the development of planetary imaging research using radar astronomy technology, researchers haveconducted related research on lunar radar imaging utilizing. This article is based on a dual ground-based radar systemconsisting of Sanya Incoherent Scatter Radar (SYISR) and FAST, using envelope alignment and phase correctionmethods to rectify the errors in radar echoes caused by relative motion between the moon and the ground. Due tothe high sensitivity of the FAST and a high signal-to-noise ratio of radar echoes, envelope alignment can basicallymeet the requirements using only curve fftting techniques. In terms of phase correction, in order to improve accuracyand reduce time consumption, this paper proposes a method that combines phase gradient autofocus algorithm withminimum entropy autofocus algorithm. Through experiments, it has been proven that the contrast of lunar imagescorrected by this method is improved, and the entropy values of the images are reduced.关键词
月球雷达成像/双基雷达/相位梯度自聚焦/最小熵自聚焦Key words
Lunar radar imaging/dual base radar/phase gradient autofocus (PGA)/minimum entropy autofocus(MEA)引用本文复制引用
俞开斌,李明辉,赵荣坤,尹岩,牛向华,孙京海,黄丽佳.联合相位校正技术在双基雷达月球成像的应用[EB/OL].(2026-01-04)[2026-01-10].https://chinaxiv.org/abs/202601.00040.学科分类
天文学
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