| 线性调频步进信号雷达微动目标成像方法 |
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| 引用本文： | 常沙,张战兵,李开明,李宏静.线性调频步进信号雷达微动目标成像方法[J].通信技术,2012(9):82-85. |
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| 作者姓名： | 常沙 张战兵 李开明 李宏静 |
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| 作者单位： | 1. 空军工程大学 信息与导航学院,陕西 西安 710077
2. 西南大学 地理科学学院,重庆 400715 |
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| 摘 要： | 旋转和振动是最常见的微动形式.目标微动会产生微多普勒效应,微多普勒特征对于目标识别与分类具有重要意义.微多普勒的存在使得目标主体的ISAR像受到污染,严重时无法识别.微多普勒对雷达分辨率极其敏感,因此宽带信号下的微多普勒研究十分必要.在线性调频步进信号体制下,引入相消处理的思想,在精分辨谱图域分离并提取微动目标的微多普勒信息,得到较为清晰的目标ISAR像,仿真验证了方法的有效性.
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| 关 键 词： | 线性调频步进信号 微动 相消 逆合成孔径雷达成像 |
ISAR Imaging Algorithm of Micro-motion Target under the Step-Frequency Chirp Signal |
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| CHANG Sha①,ZHANG Zhan-bing①,LI Kai-ming①,LI Hong-jing.ISAR Imaging Algorithm of Micro-motion Target under the Step-Frequency Chirp Signal[J].Communications Technology,2012(9):82-85. |
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| Authors: | CHANG Sha① ZHANG Zhan-bing① LI Kai-ming① LI Hong-jing |
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| Affiliation: | ②(①Information and Navigation College of AFEU,Xi’an Shaanxi 710077,China; ②Geographical Technology College of Southwest University,Chongqing 400715,China) |
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| Abstract: | The rotation and vibration are the common moving forms of micro-motion.Micro-motion target would generate micro-Doppler effect,which has great significance for target classification and recognition,while micro-Doppler would severely contaminate the ISAR image of target’s main body,thus resulting in hard recognition.Micro-Doppler is very sensitive to the radar resolution,so it is necessary to study the micro-Doppler under wideband radar.Under step frequency chirp signal system,the idea of cancellation technique is introduced to separate and extract micro-Doppler in the refined spectrogram,then the fairly clear ISAR image of micro-motion target is thus obtained.Simulation results indicate the effectiveness of this algorithm. |
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| Keywords: | step frequency chirp signal micro-motion cancellation ISAR image |
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