| 天基逆合成孔径激光雷达高灵敏度接收技术 |
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| 引用本文： | 陈汉灵,胡恒,徐卫明,舒嵘.天基逆合成孔径激光雷达高灵敏度接收技术[J].上海航天,2019,36(3):40-45. |
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| 作者姓名： | 陈汉灵 胡恒 徐卫明 舒嵘 |
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| 作者单位： | 中国科学院上海技术物理研究所空间主动光电重点实验室;中国科学院大学;上海科技大学信息科学与技术学院 |
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| 基金项目： | 中国科学院国防科技创新基金(CXJJ-17S025)；中国科学院上海技术物理研究所创新专项(CX-157) |
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| 摘 要： | 逆合成孔径激光雷达(ISAL)是一种主动式成像雷达,是合成孔径技术和激光雷达技术相结合的产物,具有极高的成像分辨率。由于无大气干扰,因此天基成像的环境十分有利于ISAL系统的部署,然而探测灵敏度不够,难以实现远距离探测的问题极大地制约了天基ISAL系统的应用。针对这一难点,提出使用高灵敏度相干平衡探测实现ISAL的空间远距离探测,计算了ISAL平衡探测的信噪比。在此基础上,提出了一种基于频率上转换的高灵敏度平衡探测接收方法,即信号光和本振光先经过频率上转换,再进行平衡探测,并实验验证了该方法的可行性。
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| 关 键 词： | 逆合成孔径 激光雷达 平衡探测 高灵敏度 上转换 |
| 收稿时间： | 2019/2/27 0:00:00 |
| 修稿时间： | 2019/4/11 0:00:00 |
High Sensitivity Receiving Technology of Space-Based Inverse Synthetic Aperture Lidar |
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| CHEN Hanling,HU Heng,XU Weiming and SHU Rong.High Sensitivity Receiving Technology of Space-Based Inverse Synthetic Aperture Lidar[J].Aerospace Shanghai,2019,36(3):40-45. |
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| Authors: | CHEN Hanling HU Heng XU Weiming and SHU Rong |
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| Institution: | Key Laboratory of Space Active Opto-electronics Technology, Shanghai Institute of Technical Physics of Chinese Academy of Sciences, Shanghai 200083, China;University of Chinese Academy of Sciences, Beijing 100049, China;School of Information Science and Technology, Shanghai Tech University, Shanghai 201210, China,Key Laboratory of Space Active Opto-electronics Technology, Shanghai Institute of Technical Physics of Chinese Academy of Sciences, Shanghai 200083, China,Key Laboratory of Space Active Opto-electronics Technology, Shanghai Institute of Technical Physics of Chinese Academy of Sciences, Shanghai 200083, China;University of Chinese Academy of Sciences, Beijing 100049, China and Key Laboratory of Space Active Opto-electronics Technology, Shanghai Institute of Technical Physics of Chinese Academy of Sciences, Shanghai 200083, China;University of Chinese Academy of Sciences, Beijing 100049, China;School of Information Science and Technology, Shanghai Tech University, Shanghai 201210, China |
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| Abstract: | Inverse synthetic aperture lidar (ISAL) is an active imaging radar that combines synthetic aperture technology with lidar technology, and it has an extremely high imaging resolution. The space-based imaging environment is very useful for the deployment of the ISAL system because of no atmospheric disturbance. However, it is difficult to conduct long-distance detection because of low receiving sensitivity. The application of the space-based ISAL system is greatly limited by this problem. Aiming at this difficulty, this paper proposes to use high-sensitivity coherent balance detection to realize space long-distance detection of ISAL, and calculates the signal-to-noise ratio of ISAL balance detection. Based on this, a high-sensitivity balanced detection method based on frequency up-conversion is proposed. The signal light and the local oscillator light are firstly received by frequency up-conversion detector before balance detection is conducted. Finally, the feasibility of the method is verified by experiments. |
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| Keywords: | inverse synthetic aperture lidar balance detection high sensitivity up-conversion |
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