微波多普勒反射计数据分析的一种优化方法

结合对多普勒频谱的分析，提出一种基于双高斯拟合的轴对称-非对称谱(SAS)分析方法。在此方法下，功率谱主要由轴对称功率谱和非轴对称功率谱两部分组成。前者主要由等离子体截止层密度的扰动调制决定，后者主要由波数为k _⊥=2k₀sinθ 的湍流的极向密度扰动决定。在分析多普勒反射计的数据时，相较于常用的频谱重心(COG)分析方法和相位微分(δ-phase)法，SAS 谱分析不仅提高了求取多普勒频移的准确性，同时还可以获取等离子体中波数为k_⊥ 的极向湍流的密度扰动强度和截止层的密度扰动强度。

Optimization for the data analysis of the microwave Doppler reflectometer

Combining with the analysis of Doppler spectrum, a new method, named symmetric-asymmetric spectrum (SAS) analysis is put forward based on dual Gauss fitting. A power spectrum is mainly composed of symmetric spectrum and asymmetric spectrum. The symmetric spectrum is principally decided by plasma cutoff density fluctuations, which can modulate the detecting signals, while the asymmetric spectrum is primarily determined by poloidal density fluctuations of k _⊥=2k₀sinθ turbulence. Compared with the commonly used method of spectral center of gravity (COG) and δ-phase method, SAS analysis not only improves the accuracy of the Doppler frequency shift measurements, but also provides the plasma density fluctuations of poloidal k_⊥ turbulence and cutoff.