具有大旋翼一类旋转部件的雷达目标成像

由于目标本身或目标部件的振动和旋转运动而引入的微多普勒谱会对目标主体的ISAR像造成污染,严重时无法对目标主体进行成像。介绍了雷达目标回波信号中的微多普勒信号产生原理,提出了一种微多普勒信息分离与提取的方法,基于旋转部件的微多普勒谱与目标主体谱在谱图域表现形式的不同,将旋转部件的微多普勒谱与目标主体谱分离后获得了具有大旋转部件一类目标的清晰像,同时也获得了目标旋转部件的一些运动及结构信息。最后,仿真结果验证了此方法的有效性。

Imaging of Moving Targets with Rotating Parts

The micro-Doppler effect induced by mechanical vibrating or rotating of structures in a radar target will contaminate the body's ISAR image.In the paper,the principle of micro-Doppler effect is introduced,and a method for extraction of the micro-Doppler information is presented,which can be used in ISAR imaging of targets with rotating parts,especially for those targets with some large rotating parts,such as helicopter.The spectrogram of micro-Doppler can be separated from the spectrogram of the target body based on the difference of their features,and then a clear ISAR image can be obtained.Meanwhile,some information of the rotating parts is achieved.Finally,a computer simulation is given to prove the effectiveness of the proposed method.