电离层相位污染和多模传播检测与识别研究

Detection and recognition of ionospheric phase contamination and multimode propagation

摘要: 相位污染和多模传播检测与识别是抑制电离层引起天波超视距雷达杂波频谱展宽亟需解决的关键问题.文中提出了一种电离层相位污染和多模传播检测与识别算法,该算法综合应用回波信号协方差矩阵时间可逆性、回波序列Hankel矩阵特性和返回散射传播模式区智能提取方法,实现了无相位污染和多模传播(I)、仅存在相位污染(II)、仅存在多模传播(III)、相位污染和多模共存(IV)四类情形检测与识别,为后续抑制相位污染和多模传播提供依据.经仿真和试验数据验证,上述方法有效.

Abstract: The most important problem to solve in correction of clutter spectrum spread for over-the-horizon radar(OTHR) is to recognize the two reasons of ionospheric phase contamination and multimode propagation. An algorithm combined with time reversibility, eigenvalue decomposition,the Hankel matrix and backscattering intelligent mode extraction is proposed to solve the four different cases of none of phase contamination and multimode propagation (I), only phase contamination(II), only multimode propagation (III) and both the phase contamination and multimode propagation exist. This method provides basis for the correction of phase contamination and multimode propagation. And it is validated by simulation and experimentation.