Comparison of Three Methods in Extracting Coherent Modes from a Doppler Backscatter System

Comparison of Three Methods in Extracting Coherent Modes from a Doppler Backscatter System
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从多普勒反向散射系统中提取相干模式的三种方法的比较

DOI:
10.1088/0256-307x/32/12/125201
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发表时间:
2015-12
影响因子:
3.5
通讯作者:
Xie Jin Lin
Xie Jin Lin
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhang Xiao Hui;Liu A Di;Zhou Chu;Hu Jian Qiang;Wang Ming Yuan;Yu Chang Xuan;Liu Wan Dong;Li Hong;Lan Tao;Xie Jin Lin

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本文比较了三种不同的方法从多普勒后向散射(DBS)中提取相干模,它们分别是复振幅谱重心法(COG)、DBS相位导数谱法(相位导数法)和相位谱法。这三种方法都能有效地提取相干模式,如测地线声模振荡。然而,在处理隐藏在DBS信号中的高频模式(几百kHz)和低频模式(几kHz)之间仍然存在差异。在相位谱中的低频处存在显著量的功率,其可以通过使用相位导数方法和COG来去除。采用COG法和相位导数法比相位谱法更能清楚地显示高频模。使用COG、相位导数法和相位谱检测到的DBS幅度谱没有显示出相干模式。当存在两个多普勒频移峰时,DBS振幅谱中出现相干模及其谐波,这些模是由DBS相位引入的。
We compare three different methods to extract coherent modes from Doppler backscattering (DBS), which are center of gravity (COG) of the complex amplitude spectrum, spectrum of DBS phase derivative (phase derivative method), and phase spectrum, respectively. These three methods are all feasible to extract coherent modes, for example, geodesic acoustic mode oscillation. However, there are still differences between dealing with high frequency modes (several hundred kHz) and low frequency modes (several kHz) hiding in DBS signal. There is a significant amount of power at low frequencies in the phase spectrum, which can be removed by using the phase derivative method and COG. High frequency modes are clearer by using the COG and the phase derivative method than the phase spectrum. The spectrum of DBS amplitude does not show the coherent modes detected by using COG, phase derivative method and phase spectrum. When two Doppler shifted peaks exist, coherent modes and their harmonics appear in the spectrum of DBS amplitude, which are introduced by the DBS phase.
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