基于空间监视雷达散射回波的电离层电子密度探测方法

目的提高空间监视雷达的电离层电波环境适应性。方法 VHF-L波段大功率雷达信号经过电离层传播时会发生非相干散射,散射回波中包含电离层信息。结合雷达方程和电离层目标特征,基于电离层非相干散射原理,理论分析空间监视雷达用于电离层电子密度非相干散射探测的条件(包括雷达参数设置和波束扫描方式),给出电离层回波功率、自相关函数和电子密度表达式,利用Matlab编程对某大功率空间监视雷达原始数据处理得到电离层散射回波及电子密度。结果给出了空间监视雷达用于电离层电子密度非相干散射探测的基本条件,实测数据发现电离层回波和电子密度符合电离层变化特征。结论利用VHF-L波段大功率雷达空间散射回波探测电离层电子密度是可行的,为空间监视雷达电离层环境感知与传播自适应修正提供了一种可能的新途径。

Ionospheric Electron Density Measurement Based on Scattered Echo from the Space Surveillance Radar

Objective To improve the environmental adaptation of ionospheric radio from space surveillance radar. Methods When the VHF-L radio propagated through the ionosphere, the radar signal was incoherently scattered by the ionospheric free electron and the ionosphere information was included in the scattered echo. Combined with the radar equation and ionospheric target property, the radar parameter setting and beam scanning mode were investigated by the incoherent scatter mechanism of ionosphere. The ionospheric echo power, auto-correlation function and electron expression were introduced. And the raw sampling data from one space radar with high power was processed by using the Matlab routine and the ionospheric echo and electron density were obtained. Results Conditions for the ionospheric incoherent scatter from the space surveillance radar was described. ionospheric echo and The electron density varied in accordance with the ionospheric characteristic. Conclusion It is feasible to derive the ionospheric electron density from the scattered echo of space surveillance radar with high power in VHF-L band, which might be a new method for ionospheric environment measurement and propagation correction.