基于分段多项式建模的电离层污染校正算法研究

Study of Ionospheric Contamination Correction Method Based on Piecewise Polynomial Phase Modeling

电离层污染使需要通过电离层传播的超视距雷达的回波谱展宽,影响雷达的目标检测性能。基于分段多项式建模的校正算法可用于解决电离层的相位污染问题,针对该算法在处理实际数据时遇到的问题,分析相位污染校正中可能出现的相位残差跳变的影响,并给出了相应的解决方案。此外,讨论电离层幅度污染的问题,给出简单的补偿方法,提供了电离层污染校正算法的完整流程。通过对实际数据的处理,验证了算法的有效性,算法更适合应用于工程实际。

The ionospheric contamination makes the echo spectrum of over the horizon radar(OTHR) which needs to propagate through the ionosphere spread,and affects the target detection performance of the radar.A method based on the piecewise polynomial phase modeling has been developed to solve the problem of ionospheric phase contamination.Aiming at the encountered problem when apply the method to process actual data,the influence of phase residual error jump which may appear in the phase contamination correction is analyzed and the corresponding solution is proposed.Moreover,the problem of ionospheric amplitude contamination is discussed.A simple compensation scheme is offered,and the entire process flow of ionospheric contamination correction method is provided.By applying it to process actual data,the effectiveness of the method is verified and it is indicated that the method is more suitable to the engineering practice application.