摘要
微动是反导系统中识别真假弹头的重要依据之一,然而传统的通过距离像包络提取微动的方法分辨率较低,无法反映章动等幅度较小的运动,针对这个问题,提出了一种利用宽带雷达距离像相位分析导弹目标微动的新方法。该方法通过共轭相乘、时频域滤波及解模糊等步骤,从散射点的相位序列中提取散射点之间的距离微小变化,从而作为分析目标微动状况的依据。通过Feko软件仿真数据对提出的方法进行了验证,实验结果表明,相比于传统的通过距离像包络分析微动的方法,新方法对于微动导致的散射点距离变化的分辨能力提高了4倍以上,能够清晰地反映出目标的章动现象;并且,时频域滤波与解模糊的处理方法也能进一步提高该方法的鲁棒性,有效降低噪声和脉冲重复频率低导致的解模糊出错的概率。
Micromotion is one of the most important features for target recognition in ballistic missile defense.However,traditional methods are difficult to analyze small micromotions like nutation as they are almost all based on the envelope of range profiles with low resolution.In this paper,a new algorithm was proposed for analysis of micromotion based on the phase of range profiles,which includes conjugate multiplication,filtering and unwrapping in time-frequency domain.Results of the method can reflect small changes of the range between scatter points caused by micromotion.Finally,simulated echoes by the software Feko are used to validate the effectiveness of the proposed method whose resolution is more than 4times better than the traditional method based on the envelope of range profiles,and can clearly show the nutation of the target.What is more,the process of filtering and unwrapping in time-frequency domain improves the robustness of the method and effectively reduces the probability of false unwrapping.
出处
《飞行器测控学报》
CSCD
2016年第5期344-350,共7页
Journal of Spacecraft TT&C Technology
基金
国家自然科学基金(No.61471012)
关键词
雷达信号处理
宽带雷达
测距
微动
导弹
radar signal processing
wideband radar
ranging
micromotion
ballistic target
