中文摘要：

为抑制高频雷达中的非平稳射频干扰,推导并分析了其距离-多普勒谱形式及时频特征,指出在时频域上射频干扰表现为单（或多）分量时频脊,且在不同距离元上的时频分布仅有一个相位因子的差别.利用射频干扰特征提出了时频掩模法来抑制非平稳射频干扰.高频地波雷达OSMAR-S实测数据处理结果表明,关于射频干扰的分析正确,干扰抑制方法有效,能够显著提高高频雷达的抗射频干扰能力.

英文摘要：

To suppress the non-stationary co-channel interference （CCI） in 为抑制高频雷达中的非平稳射频干扰,推导并分析了其距离-多普勒谱形式及时频特征,指出在时频域上射频干扰表现为单（或多）分量时频脊,且在不同距离元上的时频分布仅有一个相位因子的差别.利用射频干扰特征提出了时频掩模法来抑制非平稳射频干扰.高频地波雷达OSMAR-S实测数据处理结果表明,关于射频干扰的分析正确,干扰抑制方法有效,能够显著提高高频雷达的抗射频干扰能力.high frequency （HF） radars, its range-Doppler spectral form and time-frequency characteristics were analyzed. Results show that the CCI takes the form of ridges with nearly identical time-frequency distributions across the range bins except the phase. A novel method by time-frequency masking was proposed to suppress the non-stationary CCI. The results of the real data collected by HF radar OSMAR-S show the validness of the analysis and the proposed method to enhance the anti-interference capabilities of the HF radars markedly.