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KMID : 1024520160250091241
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Journal of the Environmental Sciences
2016 Volume.25 No. 9 p.1241 ~ p.1251
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Accuracy Evaluation of UHF Wind Profiler Radar Wind Vectors by Setting a Threshold of Signal-to-Noise Ratios
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Kim Kwang-Ho
Kim Park-Sa
Kim Min-Seong
Kang Dong-Hwan
Kwon Byung-Hyuk
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Abstract
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A minimum threshold for the signal to noise ratio (SNRmin) has to be set in the data processing system of wind profiler
radar (WPR). The data collection rate and the accuracy of the WPR wind vector depend on the SNRmin. The WPR at Uljin is operated with an SNRmin of 1 dB which is a relatively large threshold. We found that the accuracy and the continuity of the WPR wind vector with height were directly related to the variability of the SNR and vertical gradient of the squared refractive index. We investigated a quantitative method for determining a new SNRmin for the WPR at Uljin and it was evaluated with radiosonde data. The accuracy and continuity of the wind vector from an SNR of less than 1 dB, began to decrease at an altitude of 3.5 km. Most of the SNR values were less than ?3.5 dB in altitudes higher than 3.5 km. We retrieved high-accuracy wind vectors at altitudes over 3 km where measurements were deficient with an SNRmin of 1 dB.
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KEYWORD
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Wind profiler radar, Doppler spectra, Signal noise ratio, Vertical refractive index gradient
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