在天波雷達中電離層的運動會帶來回波信號在頻率的調(diào)制，從而造成雷達海雜波的展寬；在對回波做相關積累前，對調(diào)制的補償是非常重要的。該文給出了一種新的基于修正的自適應短時傅立葉變換的補償方法，通過對沒有電離層擾動的高頻表面波雷達數(shù)據(jù)人為地添加行進電離層擾動(TID)得到實驗數(shù)據(jù)。測試結果表明，該方法能有效地補償快速的TID污染，并且對不同電離層頻率調(diào)制具有良好的自適應性。
關 鍵 詞 頻率調(diào)制; 電離層; 短時傅里葉變換; 天波雷達

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