Time-frequency analysis for microwave reflectometry data processing in the HL-2A tokamak.
Time-frequency analysis for microwave reflectometry data processing in the HL-2A tokamak.
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DOI：
10.1063/1.3657157
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发表时间：
2011-10
期刊：
影响因子：
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通讯作者：
W. Zhong;Z. Shi;X. Zou;X. Ding;X. L. Huang;Y. Dong;Z. T. Liu;W. Xiao;X. Ji;Z. Cui;Yi Liu;L. Yan;Q. Yang;X. Duan
中科院分区：
文献类型：
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作者：
W. Zhong;Z. Shi;X. Zou;X. Ding;X. L. Huang;Y. Dong;Z. T. Liu;W. Xiao;X. Ji;Z. Cui;Yi Liu;L. Yan;Q. Yang;X. Duan
介绍了用Choi-Williams分布(CWD)技术处理HL-2A装置零差和定频反射仪测量数据的时频分析方法。给出了模拟信号的谱图和CWD的比较结果。结果表明，CWD能很好地提高多分量信号的时频分量表示能力。通过对调频连续波反射仪(FM-CW)节拍频率的提取和起伏特征的分析，证明了该方法的有效性。利用调频连续波的群延时和由固定频率反射仪得到的密度起伏反演出的密度分布将更加可靠和准确。
The Choi-Williams distribution (CWD) technique is introduced as a time-frequency tool for processing data measured from the new developed homodyne and the fixed frequency reflectometry in the HL-2A tokamak. The comparison between spectrogram and CWD for the simulated signal is presented. It indicates that the CWD can greatly improve the representation of the time-frequency content of the multi-components signal. Its effectiveness is demonstrated through two applications in HL-2A, which are the extraction of beat frequencies from the frequency modulated-continuous wave reflectometry (FM-CW) and the characterizing of the fluctuations. The density profile inversed from the group delay of the FM-CW and the density fluctuations deduced from the fixed-frequency reflectometry would be more reliable and accurate by using the CWD technique.