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.

Abstract
 1. 서 론
 2. 재료 및 방법
 3. 결과 및 고찰
 4. 결 론
 감사의 글
 REFERENCES

• 김광호(부경대학교 지구과학연구소, Geo-Sciences Institute, Pukyong National University) | Kwang-Ho Kim
• 김박사(부경대학교 지구과학연구소, Geo-Sciences Institute, Pukyong National University) | Park-Sa Kim
• 김민성(부경대학교 지구과학연구소, Geo-Sciences Institute, Pukyong National University) | Min-Seong Kim
• 강동환(부경대학교 지구과학연구소, Geo-Sciences Institute, Pukyong National University) | Dong-Hwan Kang
• 권병혁(부경대학교 환경대기과학과, Department of Environmental Atmospheric Sciences, Pukyong National University) | Byung Hyuk Kwon Corresponding author