摘要
高频返回散射系统工作在HF频段,这一频段电磁环境非常复杂,并且存在各种类型的干扰,这些干扰严重影响了系统的工作性能,必须加以抑制.通过对高频返回散射系统实测数据中存在的干扰进行分析,发现有种干扰在Doppler域相邻Doppler单元以及相邻距离单元均有较强的相关性.针对这种干扰,提出了一种Doppler域基于特征子空间的干扰抑制方法,即在Doppler域构造干扰协方差矩阵,进行特征分解得到干扰子空间,然后将待处理单元的回波向干扰子空间的正交补空间投影,从而将干扰滤除.实测数据处理结果证明了该方法的有效性.
HF band is a severe electromagnetic environment in which HF backscatter system works.All kinds of interference in this band having a strong impact on the system＇ s performance must be suppressed.Through analyzing the interference of the measured data of HF backscatter system,we find that some interference appears strong correlativity between adjacent range units and between adjacent Doppler units,respectively.Aiming at this kind of interference,an interference suppressing method which is based on eigen subspace in Doppler field is proposed.The method is：firstly,interference convariance matrix is constructed in Doppler field,after eigenvalue decomposition of this matrix,the interference subspace is obtained,then the pending units are projected to the orthogonal supplement of the interference subspace,finaly,the interference is excised.The results of applying this method to the measured data show the effectivity of the proposed method.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2010年第3期620-625,共6页
Acta Electronica Sinica
基金
"十一五"预研(No.3060811001060404)
关键词
高频返回散射系统
瞬态干扰
冲击干扰
短干扰
干扰抑制
HF backscatter system
transient interference
impulse interference
short interference
interference suppressing
