Interferometric measurement of tropospheric phase fluctuations at 22 GHz on antenna spacings of 27 to 540 m
Interferometric measurement of tropospheric phase fluctuations at 22 GHz on antenna spacings of 27 to 540 m
复制标题
在 22 GHz 天线间距为 27 至 540 m 时对对流层相位波动进行干涉测量
DOI：
10.1109/tap.1986.1143896
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发表时间：
1986
影响因子：
5.7
通讯作者：
R. Kawabe
中科院分区：
文献类型：
--
作者：
T. Kasuga;M. Ishiguro;R. Kawabe
利用Nobeama毫米波阵列在27~540m的天线间距上观测宇宙致密射电源，测量了对流层事件引起的22 GHz的相位涨落，并利用观测到的干涉仪相位得到了相位涨落的Allan标准差SigmaA。标准差与天线间距L之间有很好的函数关系，即σA=A×L^N+B。从2月份的观测得到的指数N与Kolmogorov湍流模式的预期分布一致，约为5/6，但小于5月份的观测的5/6。西格玛A的时间域谱还暗示了大气结构(如湿空气、云、降水等)。有季节性的变化。在20m高度监测到的气象参数与西格玛A之间没有很好的相关性。
Phase fluctuations at 22 GHz introduced by tropospheric events were measured by observing cosmic compact radio sources with the Nobeyama millimeter-wave array on antenna spacings of 27 to 540 m. The observed interferometer phases were used to derive Allan standard deviations \sigma_{A} of phase fluctuations. The standard deviations \sigma_{A} had good relations to antenna spacing L as a function, \sigma_{A} =A \times L^{N} + B . The exponent N derived from the observations in February distributed around 5/6 as expected from the Kolmogorov turbulence model, but was smaller than 5/6 from the observations in May. Time domain spectra of \sigma_{A} also imply that atmospheric structures (such as moist air, clouds, precipitation, etc.) have seasonal variations. Meteorological parameters monitored at the height of 20 m did not show good correlations to \sigma_{A} .