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在天波雷达中电离层的运动会带来回波信号在频率的调制,从而造成雷达海杂波的展宽;在对回波做相关积累前,对调制的补偿是非常重要的。该文给出了一种新的基于修正的自适应短时傅立叶变换的补偿方法,通过对没有电离层扰动的高频表面波雷达数据人为地添加行进电离层扰动(TID)得到实验数据。测试结果表明,该方法能有效地补偿快速的TID污染,并且对不同电离层频率调制具有良好的自适应性。
The movement of the ionosphere in skywave radar brings about the modulation of the echo signal at the frequency, resulting in broadening of the radar sea clutter; compensation of the modulation is very important before the correlation accumulation of the echoes. In this paper, a new compensation method based on the modified adaptive short-time Fourier transform is proposed. Experimental data are obtained by artificially adding traveling ionospheric disturbances (TIDs) to high frequency surface wave radar data without ionospheric disturbances. The test results show that this method can effectively compensate for rapid TID pollution and has good adaptability to different ionospheric frequency modulations.