Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9026041
Yin Chen, Jiajia Mao, Tao Li, Xuefen Zhang, Lei Wang
Based on the network observation data of seven stations in Beijing from 2018 to 2019, this paper proposes a set of comprehensive quality control and quality assessment method for the brightness temperature data of microwave radiometer. Different from other methods, this paper designs a quality control method for the influence of water film attached to the radome on the observation. In addition, in order to obtain more accurate simulation results, the Cloud Radar’s liquid water profile information is introduced when using the MonoRTM radiation transfer model to simulate the brightness temperature. The results of quality assessment show that the overall passing rate of bright temperature data of seven stations is above 67%, and the data availability rate is more than 70%. The availability of bright temperature of water vapor channel and oxygen channel increased by 3.74% and 1.38% respectively. The overall root mean square error of the seven sites before and after the deviation correction is 4.06K and 1.91K respectively.
{"title":"Comprehensive Quality Control Method and Effect Analysis of Brightness Temperature Data of Ground-based Microwave Radiometer","authors":"Yin Chen, Jiajia Mao, Tao Li, Xuefen Zhang, Lei Wang","doi":"10.1109/ICMO49322.2019.9026041","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026041","url":null,"abstract":"Based on the network observation data of seven stations in Beijing from 2018 to 2019, this paper proposes a set of comprehensive quality control and quality assessment method for the brightness temperature data of microwave radiometer. Different from other methods, this paper designs a quality control method for the influence of water film attached to the radome on the observation. In addition, in order to obtain more accurate simulation results, the Cloud Radar’s liquid water profile information is introduced when using the MonoRTM radiation transfer model to simulate the brightness temperature. The results of quality assessment show that the overall passing rate of bright temperature data of seven stations is above 67%, and the data availability rate is more than 70%. The availability of bright temperature of water vapor channel and oxygen channel increased by 3.74% and 1.38% respectively. The overall root mean square error of the seven sites before and after the deviation correction is 4.06K and 1.91K respectively.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121518474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9025942
Zhihua Li, Yong She, Tao Liu
The raindrop spectrum detection technology based on optical principle is of great significance for the observation of precipitation phenomenon and the calibration of radar. In view of this background, the paper proposes a method of precipitation particle measuring system based on linear CCD. The system drives the CCD by the FPGA at high speed, which makes CCD can perfectly match the parallel light source to form the particle detection space, from which it can collect particle pixel information. Then the data processing part with FPGA as the core compares and compresses the collected data to obtain the accurate grayscale image information of the particles. Finally, the system transmits grayscale images to the PC in real time and at high speed by using Gigabit Ethernet. For the purpose of verifying the feasibility and accuracy of the system, two experiments were carried out respectively using steel balls of different diameters and dripping water to simulate the raindrop particles. By comparing and analyzing the experimental data, the results show that the system can basically restore the grayscale images of two simulated particles with good accuracy and consistency. The conclusion can be drawn that the measuring system can basically meet the measuring requirements of optical raindrop spectrum measuring instrument of high-speed, accurate and non-contact.
{"title":"Design of Precipitation Particle Measuring System Based on Linear CCD","authors":"Zhihua Li, Yong She, Tao Liu","doi":"10.1109/ICMO49322.2019.9025942","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9025942","url":null,"abstract":"The raindrop spectrum detection technology based on optical principle is of great significance for the observation of precipitation phenomenon and the calibration of radar. In view of this background, the paper proposes a method of precipitation particle measuring system based on linear CCD. The system drives the CCD by the FPGA at high speed, which makes CCD can perfectly match the parallel light source to form the particle detection space, from which it can collect particle pixel information. Then the data processing part with FPGA as the core compares and compresses the collected data to obtain the accurate grayscale image information of the particles. Finally, the system transmits grayscale images to the PC in real time and at high speed by using Gigabit Ethernet. For the purpose of verifying the feasibility and accuracy of the system, two experiments were carried out respectively using steel balls of different diameters and dripping water to simulate the raindrop particles. By comparing and analyzing the experimental data, the results show that the system can basically restore the grayscale images of two simulated particles with good accuracy and consistency. The conclusion can be drawn that the measuring system can basically meet the measuring requirements of optical raindrop spectrum measuring instrument of high-speed, accurate and non-contact.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"2021 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125117782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper takes four typical lightning occur in Chengdu area as the research objects, analyzing the atmospheric electric field that before, during and after the lightning in time domain and frequency domain, selecting 30 minutes as the research time. It found that the volatility and amplitude of electric field intensity and the electric field gradient with time in local is small before the lightning occurs, lager and obvious during lightning occurs, decreasing after the lightning. Through the analysis of the energy, it found that the electric field energy is greater before lightning, the largest during lightning occurs, and reduced after the lightning in frequency domain. With the approach of the lightning, in frequency domain, the amplitude and energy of the electric field increases gradually, in the same time, curves fluctuate more obviously. Set the lightning warning level in time domain and frequency domain respectively and forecast lightning in Chengdu area as this standard, for further validating the effect on early warning system for lightning. The Ts score above 70%, missing report rate to zero, false alarm rate below 25%, which shows that these two warning levels can be effective to forecast near lightning warning.
{"title":"Research of Atmospheric Electric Field Characteristics in the Process of Lightning in Time and Frequency Domain","authors":"Lele Wang, Zaihua Guo, Qin Zhao, Huaiyu Li, Qingjun Li, Xueying Wu","doi":"10.1109/ICMO49322.2019.9026046","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026046","url":null,"abstract":"This paper takes four typical lightning occur in Chengdu area as the research objects, analyzing the atmospheric electric field that before, during and after the lightning in time domain and frequency domain, selecting 30 minutes as the research time. It found that the volatility and amplitude of electric field intensity and the electric field gradient with time in local is small before the lightning occurs, lager and obvious during lightning occurs, decreasing after the lightning. Through the analysis of the energy, it found that the electric field energy is greater before lightning, the largest during lightning occurs, and reduced after the lightning in frequency domain. With the approach of the lightning, in frequency domain, the amplitude and energy of the electric field increases gradually, in the same time, curves fluctuate more obviously. Set the lightning warning level in time domain and frequency domain respectively and forecast lightning in Chengdu area as this standard, for further validating the effect on early warning system for lightning. The Ts score above 70%, missing report rate to zero, false alarm rate below 25%, which shows that these two warning levels can be effective to forecast near lightning warning.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":" 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113947616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9025911
Wenlin Chen, Debin Su, Lijuan Wang, Tonggen Wang
Observed data of each sampling height from P-band troposphere type □ wind profiler in Sichuan Yanyuan station(2466m ASL) and Qianwei station(486m ASL) in March 2018 is taken to study the temporal and spatial characteristics as well as the differences of wind shear from troposphere wind profiler at different altitudes. The values of horizontal wind speed and wind direction obtained by wind profiler are used to calculate the wind shear index at different time and different altitudes based on the power-law formula. By calculating vector difference and fitting the index on account of least square method, the vertical wind shear characteristics over the two stations are analyzed and compared with the products measured by wind profiler. The results show that the algorithm of wind shear index based on the power-law formula can preferable to reflect the wind shear characteristics of the wind field. The wind shear index tends to decrease with the increase of altitude because of the influence of the underlying surface on the wind speed. In addition, wind shear index also shows a trend of smaller in daytime, larger at night, smaller in plain area and larger in hilly area.
{"title":"Observation Analysis of Wind Shear Characteristics from Troposphere Wind Profiler","authors":"Wenlin Chen, Debin Su, Lijuan Wang, Tonggen Wang","doi":"10.1109/ICMO49322.2019.9025911","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9025911","url":null,"abstract":"Observed data of each sampling height from P-band troposphere type □ wind profiler in Sichuan Yanyuan station(2466m ASL) and Qianwei station(486m ASL) in March 2018 is taken to study the temporal and spatial characteristics as well as the differences of wind shear from troposphere wind profiler at different altitudes. The values of horizontal wind speed and wind direction obtained by wind profiler are used to calculate the wind shear index at different time and different altitudes based on the power-law formula. By calculating vector difference and fitting the index on account of least square method, the vertical wind shear characteristics over the two stations are analyzed and compared with the products measured by wind profiler. The results show that the algorithm of wind shear index based on the power-law formula can preferable to reflect the wind shear characteristics of the wind field. The wind shear index tends to decrease with the increase of altitude because of the influence of the underlying surface on the wind speed. In addition, wind shear index also shows a trend of smaller in daytime, larger at night, smaller in plain area and larger in hilly area.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"321 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133615067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9026021
Yuankai Song, W. Hao, Liu Gaoping, Zhu Pengfei, Ding Conghui, Zhao Sen
The lightning location system in Anhui province are introduced. Under the environment of SQL Server 2005, lightning location system database is established, unifying the lightning location data storage form and promoting the application of lightning location data and its secondary development. In combination with Doppler radar products, lightning nowcasting warning system has been developed. Strengthened The live monitoring, nowcasting forecast of lightning and early warning products published through web benefit the public a lot and supply the reference for forecasters in the process of early warning signal production.
介绍了安徽省雷电定位系统。在SQL Server 2005环境下，建立了闪电定位系统数据库，统一了闪电定位数据的存储形式，促进了闪电定位数据的应用和二次开发。结合多普勒雷达产品，研制了雷电临近预报预警系统。通过网络发布闪电实时监测、临近预报和预警产品，使公众受益匪浅，并为预报员在预警信号制作过程中提供了参考。
{"title":"Lightning Location System Database Construction And Application in AnHui Province","authors":"Yuankai Song, W. Hao, Liu Gaoping, Zhu Pengfei, Ding Conghui, Zhao Sen","doi":"10.1109/ICMO49322.2019.9026021","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026021","url":null,"abstract":"The lightning location system in Anhui province are introduced. Under the environment of SQL Server 2005, lightning location system database is established, unifying the lightning location data storage form and promoting the application of lightning location data and its secondary development. In combination with Doppler radar products, lightning nowcasting warning system has been developed. Strengthened The live monitoring, nowcasting forecast of lightning and early warning products published through web benefit the public a lot and supply the reference for forecasters in the process of early warning signal production.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131837391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9026016
Zhendong Yao, Xiaojie Lou, Yongyan Su, Yong She, Lin Chen, Weifang Liu
Weather modification operation is important for Olympic Games, agriculture, environment and ecology etc. in China. Suitable weather background is required for this task. The atmospheric conditions can be obtained by dual-polarization weather radar which measuring and evaluating operation variables and has been developed. Such a magnetron radar is with advance of high radiation power, simple structure, small volume and light weight, its transmitter, receiver and signal processors can be put and fixed on the antenna elevation platform, can be omitted the influence of amplitude and phase fluctuation caused by the azimuth and elevation rotation joints. And the modern digital receiver and signal processor technologies making coherence on received and the radar detection performance perfect are employed to cancel the random initial phase and reject the slow frequency drifting for magnetron transmitter. Such a magnetron x band dual-linear polarization weather surveillance radar, so call MaXPol, has been built and installed in Weining County, Guizhou province in China at the end of August 2019. For some operation, several times of rainfall and small hail observations have been obtained. By analyzing the echoes it is shown that the polarization variables are good corresponding to those weather processes. The MaXPol radar with easy operation, accuracy data and effective application has been accepted for their weather modification operation.
{"title":"X-band Magnetron Dualpolarization Weather Radar","authors":"Zhendong Yao, Xiaojie Lou, Yongyan Su, Yong She, Lin Chen, Weifang Liu","doi":"10.1109/ICMO49322.2019.9026016","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026016","url":null,"abstract":"Weather modification operation is important for Olympic Games, agriculture, environment and ecology etc. in China. Suitable weather background is required for this task. The atmospheric conditions can be obtained by dual-polarization weather radar which measuring and evaluating operation variables and has been developed. Such a magnetron radar is with advance of high radiation power, simple structure, small volume and light weight, its transmitter, receiver and signal processors can be put and fixed on the antenna elevation platform, can be omitted the influence of amplitude and phase fluctuation caused by the azimuth and elevation rotation joints. And the modern digital receiver and signal processor technologies making coherence on received and the radar detection performance perfect are employed to cancel the random initial phase and reject the slow frequency drifting for magnetron transmitter. Such a magnetron x band dual-linear polarization weather surveillance radar, so call MaXPol, has been built and installed in Weining County, Guizhou province in China at the end of August 2019. For some operation, several times of rainfall and small hail observations have been obtained. By analyzing the echoes it is shown that the polarization variables are good corresponding to those weather processes. The MaXPol radar with easy operation, accuracy data and effective application has been accepted for their weather modification operation.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125057695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9026100
Qing Zhou, Yong Zhang, J. Jin, P. Yan, Mengyun Lou, Shanshan Lv, Jiajia Mao
As an important parameter that characterizes the structure of Atmospheric boundary layer (ABL), the boundary layer height (BLH) determines the degree of turbulent diffusion and exchange of heat and momentum within ABL. In this paper, synchronized observations of ground-based microwave radiometer (MWR) and radiosonde in Beijing Southern Meteorological Observatory from April 2017 to March 2018 are obtained to estimate BLH, based on the multiple linear regression algorithm and bulk Richardson number method, respectively. The BLHs derived from the two observations are compared and the temporal variation of BLH in Beijing are finally analyzed. Main conclusions are as follows: 1) the BLH retrieved by MWR is higher than that obtained by radiosonde by 157 m on average. The average deviation of BLH between MWR and radiosonde is smaller at 08 Beijing time (BJT) and 20 BJT than at 14 BJT, and the deviation is relatively smaller in spring and summer than other seasons. 2) BLH at 08 BJT is generally lower than that at 14 BJT and 20 BJT from both MWR and radiosonde observations. 3) radiosonde-obtained BLH peaks in the May while MWR-retrieved BLH reaches maximum in January and February. 4) BLH in Beijing at night is relatively low, which reaches the minimum $(sim 622mathrm {m}$ on average) around 05 BJT or 06 BJT. BLH gradually increases after 08 BJT and reaches the maximum $( sim 908mathrm {m}$ on average) around 15 BJT.
{"title":"Comparison of Atmospheric Boundary Layer Height Retrieved from Radiosonde and Groundbased Microwave Radiometer Measurements","authors":"Qing Zhou, Yong Zhang, J. Jin, P. Yan, Mengyun Lou, Shanshan Lv, Jiajia Mao","doi":"10.1109/ICMO49322.2019.9026100","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026100","url":null,"abstract":"As an important parameter that characterizes the structure of Atmospheric boundary layer (ABL), the boundary layer height (BLH) determines the degree of turbulent diffusion and exchange of heat and momentum within ABL. In this paper, synchronized observations of ground-based microwave radiometer (MWR) and radiosonde in Beijing Southern Meteorological Observatory from April 2017 to March 2018 are obtained to estimate BLH, based on the multiple linear regression algorithm and bulk Richardson number method, respectively. The BLHs derived from the two observations are compared and the temporal variation of BLH in Beijing are finally analyzed. Main conclusions are as follows: 1) the BLH retrieved by MWR is higher than that obtained by radiosonde by 157 m on average. The average deviation of BLH between MWR and radiosonde is smaller at 08 Beijing time (BJT) and 20 BJT than at 14 BJT, and the deviation is relatively smaller in spring and summer than other seasons. 2) BLH at 08 BJT is generally lower than that at 14 BJT and 20 BJT from both MWR and radiosonde observations. 3) radiosonde-obtained BLH peaks in the May while MWR-retrieved BLH reaches maximum in January and February. 4) BLH in Beijing at night is relatively low, which reaches the minimum $(sim 622mathrm {m}$ on average) around 05 BJT or 06 BJT. BLH gradually increases after 08 BJT and reaches the maximum $( sim 908mathrm {m}$ on average) around 15 BJT.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"298 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132529305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9025828
W. Qiang, X. Fang, Feng Hui, Dong Li-ting, Wang Hua
Based on the data of traffic accidents in Guizhou from 2014 to 2016, the general survey of traffic meteorological disasters and the climatic statistics of Guizhou from 1981 to 2010, the climatic conditions of disaster-causing meteorological factors such as low visibility, road icing, short-time heavy rainfall and rainstorm and their impacts on traffic safety are analyzed. The mileage of G60, G75 and G76 national highways in Guizhou, which are low visibility and easy to freeze, account for 7.0% (28.6%), 29.4% (17.1%) and 25.2% (7.8%) of the total mileage, respectively. Bridges and tunnels in susceptible areas account for 69.2% (80.4%), 87.5% (55.3%) and 53.1% (27.8%) of susceptible sections, respectively. Based on the above research results, the construction layout of traffic automatic weather stations in Guizhou Province is optimized, and the construction ideas of all-factor and non-all-factor traffic automatic weather stations are put forward. According to the distribution of low visibility, road icing, short-time heavy rainfall and rainstorm, the construction density layout is proposed, with a view to providing limited funds, to monitor traffic meteorological conditions more efficiently.
{"title":"Study on Layout Optimization of Automatic Traffic Weather Station in Guizhou Province","authors":"W. Qiang, X. Fang, Feng Hui, Dong Li-ting, Wang Hua","doi":"10.1109/ICMO49322.2019.9025828","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9025828","url":null,"abstract":"Based on the data of traffic accidents in Guizhou from 2014 to 2016, the general survey of traffic meteorological disasters and the climatic statistics of Guizhou from 1981 to 2010, the climatic conditions of disaster-causing meteorological factors such as low visibility, road icing, short-time heavy rainfall and rainstorm and their impacts on traffic safety are analyzed. The mileage of G60, G75 and G76 national highways in Guizhou, which are low visibility and easy to freeze, account for 7.0% (28.6%), 29.4% (17.1%) and 25.2% (7.8%) of the total mileage, respectively. Bridges and tunnels in susceptible areas account for 69.2% (80.4%), 87.5% (55.3%) and 53.1% (27.8%) of susceptible sections, respectively. Based on the above research results, the construction layout of traffic automatic weather stations in Guizhou Province is optimized, and the construction ideas of all-factor and non-all-factor traffic automatic weather stations are put forward. According to the distribution of low visibility, road icing, short-time heavy rainfall and rainstorm, the construction density layout is proposed, with a view to providing limited funds, to monitor traffic meteorological conditions more efficiently.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134197447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9026053
Pu Jun-wei, J. Xiaobing, Zhang Liang, Yuan Hairong, Liu Chang, Yang Jin
The atmospheric electric field intensity threshold method is generally used for lightning warning at present. However, this method has the problem of high false alarm rate. The lightning warning effect can be effectively improved by combining the electric field change rate threshold of 5 minutes and electric field threshold. The lightning warning effect can be effectively improved by combining the 5 minutes electric field change rate threshold with electric field threshold. The threshold value of electric field and the threshold value of electric field change rate in Wenjiang can be obtained by using the statistical method to approach the actual first and last moments of lightning weather, and a lightning warning model based on atmospheric electric field is established. The lightning warning model is verified with the lightning monitoring data from 2014 to 2017. The results show that: 1) The success rate of lightning warning is 74.2%, the false alarm rate is 12.9% and the missing alarm rate is 9.7%. 2) The start warning for the lightning weather process was 2.2 minutes ahead, and the end of the lightning weather process was 4.4 minutes behind. The warning time series basically covers the lightning weather process, and meets the need of short local warning for the lightning weather process.
{"title":"Experimental Study on Lightning Warning by Atmospheric Electric Field","authors":"Pu Jun-wei, J. Xiaobing, Zhang Liang, Yuan Hairong, Liu Chang, Yang Jin","doi":"10.1109/ICMO49322.2019.9026053","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026053","url":null,"abstract":"The atmospheric electric field intensity threshold method is generally used for lightning warning at present. However, this method has the problem of high false alarm rate. The lightning warning effect can be effectively improved by combining the electric field change rate threshold of 5 minutes and electric field threshold. The lightning warning effect can be effectively improved by combining the 5 minutes electric field change rate threshold with electric field threshold. The threshold value of electric field and the threshold value of electric field change rate in Wenjiang can be obtained by using the statistical method to approach the actual first and last moments of lightning weather, and a lightning warning model based on atmospheric electric field is established. The lightning warning model is verified with the lightning monitoring data from 2014 to 2017. The results show that: 1) The success rate of lightning warning is 74.2%, the false alarm rate is 12.9% and the missing alarm rate is 9.7%. 2) The start warning for the lightning weather process was 2.2 minutes ahead, and the end of the lightning weather process was 4.4 minutes behind. The warning time series basically covers the lightning weather process, and meets the need of short local warning for the lightning weather process.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133194121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9026147
Zhao Panpan, Yang Bifeng, Zhang Yi, Ma Shangchang
In the surface meteorological observation service, uncontrollable factors, such as signal interference, extreme weather events, sensor failures, et al., inevitably cause temperature observables missing or observing errors, and then affecting integrity and accuracy of the single-channel measurements. However, collecting the temperature records in a multi-channel way can alleviate the data loss and improves the data reliability. This paper proposes a multi-channel temperature acquisition and fusion system, which takes the STM32F411 micro controller as its master chip. The system fuses the temperature observables from multiple channels, which can realize lower computer positioning. Finally, the lower computer transmits the temperature and location data to the software on upper computer by the 4G-network, and all the data can be displayed and stored there. We evaluate the performance of this system by comparing the fused data with the single-channel data. The test results show that the fused data perform better in terms of integrity and accuracy. During the tests, the system runs smoothly with data transferring stably, which indicates that it could be used in practice applications.
{"title":"A Multi-Channel Temperature Measurement and Fusion System Based on Cortex-M4","authors":"Zhao Panpan, Yang Bifeng, Zhang Yi, Ma Shangchang","doi":"10.1109/ICMO49322.2019.9026147","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026147","url":null,"abstract":"In the surface meteorological observation service, uncontrollable factors, such as signal interference, extreme weather events, sensor failures, et al., inevitably cause temperature observables missing or observing errors, and then affecting integrity and accuracy of the single-channel measurements. However, collecting the temperature records in a multi-channel way can alleviate the data loss and improves the data reliability. This paper proposes a multi-channel temperature acquisition and fusion system, which takes the STM32F411 micro controller as its master chip. The system fuses the temperature observables from multiple channels, which can realize lower computer positioning. Finally, the lower computer transmits the temperature and location data to the software on upper computer by the 4G-network, and all the data can be displayed and stored there. We evaluate the performance of this system by comparing the fused data with the single-channel data. The test results show that the fused data perform better in terms of integrity and accuracy. During the tests, the system runs smoothly with data transferring stably, which indicates that it could be used in practice applications.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133537080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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