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基于广义S变换的电离层相位去污染算法研究 被引量:1

Ionospheric Phase Contamination Correction Method Using Generalized S-Transform
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摘要 研究了基于S变换的电离层相位去污染算法,针对S变换瞬时频率估计存在对低频估计性能较差的问题,提出了基于广义S变换电离层去污染算法,并将该算法应用于超视距雷达的电离层相位去污染中。实验结果显示,相比其他方法,如最大熵谱估计算法、伪Wigner-Ville分布电离层相位去污染算法、改进的自适应短时傅里叶变换方法等,文中提出的方法在低复杂度条件下可以得到更好的去污染性能。 This paper analyzes the instantaneous frequency(IF) estimation properties of S-Transform(ST) and proposes the reason of the poor estimation performance for ST at low frequencies.A generalized S-Transform(GST) which has better performance than the ST at low frequencies is therefore introduced in the IF estimation.GST is applied in the phase contamination correction of over-the-horizon-radar(OTHR) in this paper.Through the comparisons on the calculation complex and the effectiveness of contamination correction with the maximum entropy spectrum analysis(MESA),Pseudo Wigner-Ville Distribution(PWVD) method and the Modified Adaptive Short Time Fourier Transform(MASTFT) method in the referred literatures,the GST method used in this paper has much better performance.
作者 鲁晓倩 孙荣
出处 《实验科学与技术》 2012年第1期6-9,共4页 Experiment Science and Technology
基金 教育部中央高校基本科研业务费专项资金资助项目(ZYGX2009J095)
关键词 S变换 瞬时频率 广义S变换 超视距雷达 S-transform instantaneous frequency generalized S-transform OTHR
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