| 机载单通道雷达实波束扫描的前视探测 |
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| 引用本文： | 杨志伟,贺顺,廖桂生.机载单通道雷达实波束扫描的前视探测[J].航空学报,2012,33(12):2240-2245. |
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| 作者姓名： | 杨志伟 贺顺 廖桂生 |
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| 作者单位： | 1. 西安电子科技大学 雷达信号处理国防科技重点实验室, 陕西 西安 710071;
2. 西安科技大学 通信学院, 陕西 西安 710054 |
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| 基金项目： | 国家自然科学基金，国防预研基金，教育部博士点新教师基金，长江学者和创新团队发展计划 |
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| 摘 要： | 针对机载单通道雷达采用合成孔径雷达(SAR)技术、多普勒波束锐化(DBS)技术等途径难以实现载机飞行路线正前方高分辨率成像问题,研究了一种利用方位实波束重叠扫描的新型机载单通道雷达前视探测方法,讨论了提高方位分辨率的可行性和适用条件。该方法根据目标回波强度受到波束扫描增益调制的特点,通过计算修正的Capon空间谱来实现方位超分辨。模拟实验表明,所提方法能够实现机载单通道雷达的前视成像,可以显著提高波束主瓣区域内强弱临近目标的分辨能力。
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| 关 键 词： | 合成孔径雷达 多普勒波束锐化 前视成像 波束扫描 超分辨 |
| 收稿时间： | 2011-12-28; |
| 修稿时间： | 2012-05-23 |
Forward-looking Detection for Airborne Single-channel Radar with Beam Scanning |
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| YANG Zhiwei
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HE Shun
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LIAO Guisheng.Forward-looking Detection for Airborne Single-channel Radar with Beam Scanning[J].Acta Aeronautica et Astronautica Sinica,2012,33(12):2240-2245. |
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| Authors: | YANG Zhiwei HE Shun LIAO Guisheng |
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| Institution: | 1. National Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China;
2. Communication and Information Engineering College, Xi’an University of Science and Technology, Xi’an 710054, China |
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| Abstract: | Traditional side-looking synthetic aperture radar (SAR) and Doppler beam-sharpening (DBS) technologies cannot generate images of the areas in flight direction with high azimuth resolution. To alleviate this problem, an innovative approach based on real-beam scanning is presented. Moreover, both the feasibility and the applicable conditions of azimuth super-resolution are discussed. According to the model of echoes in which receiver power is modulated by beam gain, a modified Capon algorithm is employed to calculate the spatial spectrum. Numerical simulation indicates that it can achieve forward-looking imaging for an airborne single-channel radar, and its performance is better than that of Capon when strong signals and weak signals are in co-existence. |
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| Keywords: | synthetic aperture radar Doppler beam-sharpening forward-looking imaging beam scanning super-resolution |
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