摘要
工作在短波波段（2～15MHz）的高频地波雷达回波中存在密集的电台干扰，严重影响其探测性能。极化滤波是抑制高频雷达中短波电台干扰的有效方法，而正确估计信号和干扰的极化状态是提高极化滤波器性能的关键因素。提出一种基于分数阶傅立叶变换的极化状态估计方法，利用信号极化信息的分数域不变性，在分数域估计干扰的极化状态。仿真结果表明：该方法能准确估计出高频雷达系统中目标和干扰的极化状态，满足高频雷达极化信号处理的需要。
The performance of the high frequency（HF）radar system, which works on the shortwave band（2-15 MHz）, degrades heavily in an intensive radio interference environment. To suppress the interferenee effectively, polarization filtering can be utilized and the accurate estimation of the polarization status of signal and in- terference becomes a critical element for improving the capability of polarization fil- tering. Based on fractional Fourier transform（FrFT）,a novel method,in which the polarized states of the interference are estimated in the FrFT domain based on the inflexibility feature of the signals in Fractional domain and temporal domain, is in- troduced in this paper. The simulation of the experimental data indicates that the polarized states of the target and the radio interference can be estimated exactly and the requirement of polarization filtering can be met in the HF radar system.
出处
《电波科学学报》
EI
CSCD
北大核心
2010年第5期815-822,共8页
Chinese Journal of Radio Science
基金
国家973项目基金(No.2007CB310606)
教育部留学回国人员科研启动基金资助项目
