Wind Profiler Velocity Estimation with Complex Adaptive Line Enhancer

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  • 複素型適応ラインエンハンサによるウインドプロファイラの視線方向速度推定
  • フクソケイ テキオウ ラインエンハンサ ニ ヨル ウインドプロファイラ ノ シセン ホウコウ ソクド スイテイ

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A 1.3 GHz-pulse Doppler radar called a lower atmospheric wind profiler (LAWP) was developed by Communications Research Laboratory in 1990. The LAWP can measure lower atmospheric winds between 100 m and 3 km above the ground. However, the influence of ground clutter on LAWP measurements severely degrades the reliavility of wind velocity estimation, because LAWP detects very weak signals from clear air. On the other hand, Li has proposed a complex notch filter (CNF) by which sinusoidal signals in a quadrature sampling system can be detected. This filter is suitable for detecting complex signals, but it is very difficult to estimate an exact wind velocity by CNF, because of the influence of ground clutter and the fluctuating target. The purpose of this paper is to estimate the exact wind velocity under the above-mentioned ill conditions. The proposed signal processing consists of a complex notch filter and a complex adaptive line enhancer. Passing the received signal through the notch filter, the target signal is obtained. Then, passing this signal through the complex adaptive line enhancer, the wind velocity will be exactly estimated. The validity of this method is demonstrated by real data provided by LAWP.

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