消除OTHR电离层相位污染的相邻相位差法

电离层扰动会使天波超视距雷达（OTHR）回波信号的多普勒谱展宽,影响OTHR目标检测能力,需要进行去污染处理.在分析OTHR信号处理过程和电离层扰动对回波信号污染机理的基础上,利用回波信号污染前后的相位关系,提出了消除电离层非线性相位污染的相邻相位差法（APD）,并与现有的几种去电离层相位污染方法进行了比较.计算机仿真结果表明：APD方法去相位污染效果明显,且当污染信号的幅度和频率变化时具有一定的稳定性;与其他方法相比该方法估计误差小且比较平滑,特别在校正低信噪比下的电离层相位污染时具有一定的优势.

Approach of Adjacent Phase Difference for Eliminating Ionospheric Phase Contamination of OTHR

The ionospheric disturbance can spread the Doppler spectrum of the OTHR echoes,degrading the target detection capability of the OTHR,and the process of eliminating pollution must be done.Based on analyzing the signal processing of OTHR and the mechanism of the echoes contamination due to the ionospheric disturbance,the adjacent phase differenc（eAPD）method was proposed for eliminating ionospheric nonlinear phase contamination in terms of the phase relation between before and after contamination of echoes,and the new approach was compared with some current approaches of ionospheric phase decontaminaton.Simulation results show that the effect of phase decontamination by ADP method is distinct and it is of a certain stability when the amplitude and frequency of contamination signal changing.Compared with other methods,the estimation error of the approach is less,and smoother,especially presenting a certain advantages for correcting ionospheric phase contamination under the circumstances of lower SNR.