AbstractHerein we propose a data processing method to analyse broadband reflectometry signals based on the Wigner–Ville distribution (WVD). The method offers the advantage of good localization of the reflectometry signal energy in the time-frequency domain. Simulations are presented to test the ability of this technique to follow the average beat frequency that is the relevant quantity to invert the plasma profile. The method is compared with the short-time fourier transform (STFT) analysis both for simulated and for ASDEX Upgrade plasmas. It is shown that the WVD has potential advantages for the routine evaluation of density profiles. The method can also be useful to study fluctuations, namely when abrupt changes of turbulence occur at the L–H transition.
本文提出了一种基于Wigner-Ville分布（WVD）的数据处理方法，用于分析宽带反射测量信号。该方法在时频域中对反射测量信号能量具有良好的定位优势。通过仿真测试了该技术跟踪平均拍频的能力，而平均拍频是反演等离子体剖面的相关量。将该方法与短时傅里叶变换（STFT）分析进行了比较，既针对模拟等离子体，也针对ASDEX Upgrade装置中的实际等离子体。结果表明，WVD在常规密度剖面评估方面具有潜在优势。此外，该方法还可用于研究湍流的涨落，尤其是在L-H转换期间湍流发生突变的情况。