线性调频步进信号雷达微动目标成像方法  

ISAR Imaging Algorithm of Micro-motion Target under the Step-Frequency Chirp Signal

作　　者：常沙[1] 张战兵[1] 李开明[1] 李宏静[2] 

机构地区：[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

出　　处：《通信技术》2012年第9期82-85,共4页Communications Technology

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。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.

关 键 词：线性调频步进信号 微动 相消 逆合成孔径雷达成像 

分 类 号：TN957[电子电信—信号与信息处理]