中文摘要：

提出一种高频地波雷达的射频干扰抑制方法。基于地波雷达的距离-多普勒（RD）频谱数据,分析了射频干扰特性。利用射频干扰在距离向的强相关性特征,选取RD谱中仅存在射频干扰的远距离单元数据构造自协方差矩阵,使用子空间投影方法实现射频干扰抑制。最后,对实测数据进行了处理,结果表明信噪比得到明显改善,验证了该算法的有效性。

英文摘要：

A method of radio frequency interference suppression（RFI） was given in the paper. The char- acter of radio frequence suppression was analysed based on spectral datas of Range-Doppler of ground wave radar. According to its character of strong correlation in range cell, radio frequence interference can be suppressed by selecting datas of an area which is from far ranges in the RD spectrum with RFI alone, con- strutting autocovariance matrix and applying eigenvalue decomposition method. Finally, conclusion of ex- periment show that the method of radio frequence interference suppression is valid, and the signal-to-noise ratio（SNR） improve-ment can be about 17 dB.