The Evaluation of Wind Measurement Accuracy by Wind Profile Radar

Deng Chuang; Ruan Zheng; Wei Ming; Ge Runsheng

Vol.23, NO.5, 2012

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2012 > 23(5): 523-533

Deng Chuang, Ruan Zheng, Wei Ming, et al. The evaluation of wind measurement accuracy by wind profile radar. J Appl Meteor Sci, 2012, 23(5): 523-533.

Citation:

Deng Chuang, Ruan Zheng, Wei Ming, et al. The evaluation of wind measurement accuracy by wind profile radar. J Appl Meteor Sci, 2012, 23(5): 523-533.

Deng Chuang, Ruan Zheng, Wei Ming, et al. The evaluation of wind measurement accuracy by wind profile radar. J Appl Meteor Sci, 2012, 23(5): 523-533.

Citation:

Deng Chuang, Ruan Zheng, Wei Ming, et al. The evaluation of wind measurement accuracy by wind profile radar. J Appl Meteor Sci, 2012, 23(5): 523-533.

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The Evaluation of Wind Measurement Accuracy by Wind Profile Radar

1.
Nanjing University of Information Science & Technology, Nanjing 210044
2.
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081

Received Date: 2011-10-24
Rev Recd Date: 2012-06-29
Publish Date: 2012-10-31

Abstract

Abstract

As a new type of detection instrument, wind profile radar (WPR) can detect meteorological factors such as wind profiles. The special detecting ability of WPR decides its broad application in atmospheric science research, climate research, meteorological operation application, aviation security and many other areas. Data quality control and accuracy of WPR for application of comprehensive developing meteorological operation has the vital significance.Based on basic data of WPR and meteorological background information, a new method of evaluating wind measurement precision of WPR is proposed. Combined with PB-type Ⅱ troposphere WPR detection data from Yanqing Meteorological Observatory of Beijing, the feature of WPR data is analyzed, processing all continuous observation data of four months (March, June, September and December) of 2010, except for some missing measurements. According to rain gauge data hour by hour, all data are divided into two categories: Clear sky and rainfall, rainfall data are extended to five hours before and after the precipitation. Yanqing is located in the north mountain areas of Beijing, few days of precipitation are observed by WPR site, only 15 times in all. A total of 34380 individual observation cycle data of clear sky and 2580 individual observation cycle data of rainfall are statistically analyzed, respectively.Results show that the maximum height is 8 km in June and September, 6 km in March and December when the velocity error is less than 1.5 m·s^-1, and the wind direction error is less than 10°, which basically meets the design requirements of the radar detection height. Quality of radar return signal and inhomogeneity of atmosphere are the two influencing issues for wind measurement accuracy of radar.Signal quality directly affects the detection height, and the SNR (signal to noise ratio) of radar return signal has influences on wind measurement precision on the upper air, where -15.0 dB of SNR can be judged as the threshold of maximum detection height of radar wind measurement reliability. Inhomogeneity of atmosphere underclear air conditions affects the precision of wind measurement slightly.Larger errors of horizontal wind direction and speed appear when it rains, making the wind accuracy unacceptable especially. 1 or 2 hours before the convective precipitation, horizontal wind direction and speed of the variance increase rapidly, which could be a sign of strong precipitation.This new method and the evaluating approaches have the following advantages: Four groups of three-beam detected pattern are used to evaluate effective detected height and accuracy of wind measurement under clear sky conditions.The wind levels are determined through the threshold value combined horizontal speed and direction.The thresholds are based on different months and different heights under clear air conditions.The influences of wind measurement precision are given by analyzing two different types of precipitation.Inhomogeneity of atmosphere is found obviously before rainfall, which can be seen as a warning indicator before strong precipitation.
- wind measurement accuracy;
- SNR;
- horizontal wind speed standard deviation;
- horizontal wind direction standard deviation

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References(25)

Figures and Tables

Fig. 1 The figure of five-beam wind profile radar detection system

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图 2 水平风速、风向标准差分布频数图

(a) 高模式风速标准差, (b) 高模式风向标准差, (c) 低模式风速标准差, (d) 低模式风向标准差

Fig. 2 The standard deviation of horizontal wind speed and direction for four-month data in high and low modes

(a) standard deviation of wind velocity in high mode, (b) standard deviation of wind direction in high mode, (c) standard deviation of wind velocity in low mode, (d) standard deviation of wind direction in low mode

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Fig. 3 Two curves of clear air SNR with horizontal wind speed standard deviation, and clear air SNR with height in high mode

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Fig. 4 The diurnal variation of horizontal wind speed standard deviation in clear sky for four months

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Fig. 5 The diurnal variation of horizontal wind direction standard deviation in clear sky for four months

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Fig. 6 Distribution of wind measurement precision in clear sky for four months

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图 7 典型的层状云降水个例 (阴影区表示水平风速标准差；黑色折线表示降水量)

Fig. 7 The examples of typical uniform precipitation

(the shaded denotes the standard deviation of horizontal wind speed; black polyline denotes precipitation)

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图 8 典型的对流性降水个例 (阴影区表示水平风速标准差；黑色折线表示降水量)

Fig. 8 The examples of typical convective precipitation

(the shaded denotes the standard deviation of horizontal wind speed; black polyline denotes precipitation)

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Table 1 Parameters of wind profile radar

雷达参数	探测模式
雷达参数	高	低
脉冲重复周期/μs	100	20
脉冲宽度/μs	4.0	0.8
发射功率/kW	7.7	7.7
天线增益/dB	29	29
相干积分次数	50	200
谱平均数	12	6
谱变换数	512	216
距离库长/m	240	120
噪声系数/dB	2	2

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Table 2 Rank of wind measurement precision

序号	测风质量等级	水平风标准差约束条件
序号	测风质量等级	风速/(m·s^-1)	风向/(°)
1	优秀	σ_v≤0.5	σ_φ≤5
2	良好	0.5＜σ_v≤1.0	5＜σ_φ≤10
3	达标	1.0＜σ_v≤1.5	10＜σ_φ≤15
4	超标	1.5＜σ_v≤2.0	15＜σ_φ≤20
5	误差大	σ_v＞2.0	σ_φ＞20

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