一种自适应补偿天波雷达系统中电离层运动的方法

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。
关 键 词 频率调制; 电离层; 短时傅里叶变换; 天波雷达

Abstract The ionospheric layer movement produces frequency modulation for the HF sky-wave radar signal such that the sea clutter is broadened in Doppler domain. Compensation for the modulation is significant before radar coherent integration. This paper addresses a modified adaptive short time Fourier transform (MASTFT) and proposes a MASTFT-based compensation method. Experimental tests are constructed by inducing the contamination of simulative traveling ionospheric disturbance (TID) to the undisturbed data collected by high frequency surface wave radar (HFSWR). The test results show that the proposed method can effectively compensate even for rapid TID and has good adaptability for different ionospheric frequency modulations.
Key words frequency modulation; ionosphere; short time Fourier transform; sky wave radar