Multiple wall-reflection effect in adaptive-array differential-phase reflectometry on QUEST
Multiple wall-reflection effect in adaptive-array differential-phase reflectometry on QUEST
复制标题
QUEST 自适应阵列微分相位反射计中的多重壁反射效应
DOI：
10.1088/1748-0221/11/01/c01014
复制
发表时间：
2016
影响因子：
1.3
通讯作者：
H Zushi
中科院分区：
文献类型：
--
作者：
H Idei;K Mishra;MK Yamamoto;A Fujisawa;Y Nagashima;M Hamasaki;Y Hayashi;T Onchi;K Hanada;H Zushi
一个相控阵天线和软件定义无线电（SDR）外差检测系统已经开发的自适应阵列方法在反射测量的QUEST。在QUEST设备被认为是一个大的超大型腔，驻波（多次壁反射）的效果显着观察扭曲的振幅和相位的演变，即使自适应阵列分析。在波数域对畸变场进行快速傅里叶变换，将有壁面反射和无壁面反射的分量分开处理。通过FFT程序，从畸变场的演化中正确地获得了微分相位演化。提出了一种克服多壁反射效应的频率导数法，并通过FFT分析，正确地获得了导数法的小频差超外差分量。
A phased array antenna and Software-Defined Radio (SDR) heterodyne-detection systems have been developed for adaptive array approaches in reflectometry on the QUEST. In the QUEST device considered as a large oversized cavity, standing wave (multiple wall-reflection) effect was significantly observed with distorted amplitude and phase evolution even if the adaptive array analyses were applied. The distorted fields were analyzed by Fast Fourier Transform (FFT) in wavenumber domain to treat separately the components with and without wall reflections. The differential phase evolution was properly obtained from the distorted field evolution by the FFT procedures. A frequency derivative method has been proposed to overcome the multiple-wall reflection effect, and SDR super-heterodyned components with small frequency difference for the derivative method were correctly obtained using the FFT analysis.