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Two-dimensional full-wave simulations of radial correlation Doppler reflectometry in linear and non-linear regimes

E Blanco, T Estrada2013年Plasma Physics and Controlled FusionIF 2.2出版社

The technique of radial correlation reflectometry both conventional and Doppler is studied using a two-dimensional full-wave code in extraordinary mode of propagation. Linear and non-linear regimes are considered for a wide range of antenna tilt angles and radial correlation lengths. The radial correlation length Lr computed from the amplitude, the complex amplitude and the complex phase signals are shown for each particular case. The numerical results show that the measurement of the turbulence radial correlation length with microwave reflectometry is challenging. It is shown that in most cases the radial correlation length as measured by microwave reflectometry is different from the turbulence radial correlation length. In the linear regime the results show that conventional reflectometry overestimates the radial correlation length in agreement with theory. It is shown that Doppler reflectometry provides a good estimation for Lr if the antenna tilt angle θ is properly scanned. In the non-linear regime both conventional and Doppler reflectometry provide similar Lr values regardless of the antenna tilt angle, but these values are shorter than the turbulence radial correlation length.

日本語訳

径方向相関反射測定法(従来型およびドップラー型)を、異常モード伝播における二次元完全波動コードを用いて研究した。線形および非線形領域を、広範囲のアンテナ傾斜角と径方向相関長に対して考察した。振幅、複素振幅、および複素位相信号から計算された径方向相関長Lrを、各々の特定のケースについて示す。数値結果は、マイクロ波反射測定法による乱流径方向相関長の測定が困難であることを示している。ほとんどの場合において、マイクロ波反射測定法で測定された径方向相関長は、乱流の径方向相関長とは異なることが示された。線形領域では、従来型反射測定法が径方向相関長を過大評価するという結果が得られ、これは理論と一致する。ドップラー反射測定法は、アンテナ傾斜角θが適切に走査されれば、Lrの良好な推定値を提供することが示された。非線形領域では、従来型およびドップラー型の両方の反射測定法が、アンテナ傾斜角に関係なく同様のLr値を提供するが、これらの値は乱流の径方向相関長よりも短い。

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ReflectometryDoppler reflectometry
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