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.
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