改进的分段多项式建模的电离层相位去污染新方法  

A new method based on improved piecewise polynomial phase model to correct ionospheric phase contamination

作　　者：刘颜回[1] 聂在平[1] 赵志钦[1] 

机构地区：[1]电子科技大学电子工程学院微波工程系,四川成都610054

出　　处：《电波科学学报》2008年第3期476-483,共8页Chinese Journal of Radio Science

基　　金："新世纪优秀人才支持计划"项目资助(Y02020023901031)

摘　　要：时变电离层的相位污染使天波超视距雷达(OTHR)的回波多普勒谱展宽。近年来已发展了基于分段的相位多项式参数建模和高阶模糊函数的方法估计和校正电离层的相位污染。由于实际电离层信道为时变的且不可预测,因此,采用预先确定阶数的建模方法有较大的局限性。本文提出了一种改进的方法来选择相位多项式建模的阶数。该方法引入三个判决准则对分段后的信号作建模阶数的自适应选择。实验结果表明,改进后的算法比原有的分段相位多项式参数估计方法以及其他两种电离层校正方法具有更好的性能,特别在校正快速变化的电离层相位污染时具有更为明显的优势。The significant Doppler spread of Over-the-horizon radar （OTHR） echoes is induced by the time-variant phase perturbation of the ionospheric medium. The parametric method , where piecewise polynomial phase model and high-order ambiguity function analysis are adopted. , is usually used to correct the phase contamination Because the ionosphere channel is always time-variant and difficult to be forecasted, The performance of the parametric method is limited if the order of polynomial phase model is artificially fixed. An improved method with three adaptive criteria for selecting the order of the model for each segment of the signals is proposed. Simulation results show that the new method has better performance than those methods with fixed order, especially for the case of rapidly fluctuating ionospheric phase contamination.

关 键 词：天波超视距雷达 电离层 相位污染校正 多项式相位 

分 类 号：TN011.2[电子电信—物理电子学]