Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16126
Title: Discrete Hilbert transformation and its application to estimate the wind speed in Hong Kong
Authors: Zhu, Z
Yang, H 
Keywords: Discrete Hilbert transform
Energy spectrum
Wind speed
Issue Date: 2002
Publisher: Elsevier
Source: Journal of wind engineering and industrial aerodynamics, 2002, v. 90, no. 1, p. 9-18 How to cite?
Journal: Journal of wind engineering and industrial aerodynamics 
Abstract: Discrete Hilbert Transform (DHT) has been applied to estimate the wind speed with the sample data sequence selected from the data record observed by the observatory in Hong Kong in June 1989, during which the data pertain to deep valleys and sharp crests due to manifold weather conditions in this region. To confirm the performance of the discrete Hilbert transformer, two harmonic input sequences were used to inspect the output signals, whether good agreement with the theoretical results is obtained. It was found that the energy spectrum and the outputs for the two different harmonic discrete waves are certainly correct. After the inspection of the DHT filter, the sample data for wind speed in Hong Kong were used for wind speed forecasting. For zero mean input sequence, the variance of the output is the same as that of the input signals, and so is the energy spectrum. The DHT of an individual input sample can really reflect the local variation performance, since it is the convolution with the reciprocal of time and the input data sequence, but there exists phase shift. For harmonic signals, the output signal holds a 90° phase delay.
URI: http://hdl.handle.net/10397/16126
ISSN: 0167-6105
EISSN: 1872-8197
DOI: 10.1016/S0167-6105(01)00109-X
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