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针对电离层杂波这一目前限制中远程高频地波雷达发展的主要因素,分析了突发E层(Es)杂波的信号特征.观察到电离层Es层杂波会在1d内多个时间段出现,每次持续时间为2～3h,且历经由单分量时频分布到扩展型散乱分布的变化.Es层杂波在能量上显著高于雷达海洋回波,且在距离上的相关性明显高于海洋回波,据此提出了杂波抑制的距离相关对消法,利用相邻距离元上回波信号估计杂波子空间,对杂波进行正交投影滤波.雷达实测数据处理结果表明上述分析和杂波抑制方法是正确和有效的.
Ionospheric clutter main factors that limits the current remote HFSWR development, analysis of the burst signal characteristic E layer (Es) clutter. Es observed ionospheric clutter will be a plurality of layers within 1d period occurs, the duration of each of 2 ~ 3h, and after the single-frequency components is distributed to the expanded layer of randomly distributed variation .Es ocean clutter the radar echo significantly higher in energy, and the correlation distance significantly higher than sea echoes from clutter suppression is proposed whereby the relevant cancellation method estimates the echo signal by using the adjacent distance element clutter subspace of orthogonal projection clutter filtering of radar data processing result Found This shows that the above analysis and clutter suppression methods are correct and effective.