Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9026087
Li Wei, Wang Yao, Gan Zhiqiang
There was an convective gale weather event in Danzhou City around 4:00 a.m. on August 29, 2019, Hainan Province, which was identified as class III (ef2) tornado by Hainan Meteorological Service. Before and after the event tornado weather occurred, Hainan radar, regional automatic weather station and other detection equipment have successfully monitored the activity of the convective system, among which the strongest value of echo of Haikou dual polarization radar can reach 55dBZ, and the strongest echo of Dongfang CINRAD/SA radar can reach 50dBZ. The radial velocity products of Haikou radar show that there is a cyclonic wind shear in the lower layer of Danzhou City, the maximum rotation speed is 17m / s, and the intensity belongs to the structure of moderate to weak mesocyclone. These fully reflect the ability of Hainan detection equipment to monitor the tornado weather in real time.
{"title":"Analysis of the Effectiveness of Hainan Weather Radar Detecting Tornado","authors":"Li Wei, Wang Yao, Gan Zhiqiang","doi":"10.1109/ICMO49322.2019.9026087","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026087","url":null,"abstract":"There was an convective gale weather event in Danzhou City around 4:00 a.m. on August 29, 2019, Hainan Province, which was identified as class III (ef2) tornado by Hainan Meteorological Service. Before and after the event tornado weather occurred, Hainan radar, regional automatic weather station and other detection equipment have successfully monitored the activity of the convective system, among which the strongest value of echo of Haikou dual polarization radar can reach 55dBZ, and the strongest echo of Dongfang CINRAD/SA radar can reach 50dBZ. The radial velocity products of Haikou radar show that there is a cyclonic wind shear in the lower layer of Danzhou City, the maximum rotation speed is 17m / s, and the intensity belongs to the structure of moderate to weak mesocyclone. These fully reflect the ability of Hainan detection equipment to monitor the tornado weather in real time.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"17 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":"124481174","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/ICMO49322.2019.9025953
Yu Shijie, Shi Zhao, Li Xuehua, Wang Xin, W. Xuejun
A large number of weather operational radars were deployed around China in the past twenty years, those radar aregradually being upgraded to dual-polarization weather radars. Polarized variables play an important role in improving radar data quality, quantitative precipitation estimate and hydrometeor classification algorithm. Calibration is the key basis for successful application of dual polarization radar. At present, the main calibration methods for dual polarization weather radar consist of signal source method, solar method, light rain method, metal ball method, etc. In this paper, a full link active calibration method is applied to calibrate the dual-polarization weather radar. The full link active calibration device first receives the horizontal polarization wave and vertical polarization wave transmitted by the radar, and retrieve the time-frequency characteristics of the transmitted waveform, such as pulse waveform, transmitted central frequency and other information. Based on the acquired transmission information, the device quickly generates the simulated target with specific distance, polarized characteristics and Doppler information. Secondly, through the Up conversion, and Amplifier modules, the calibration signal is transmitted back to the radar, then the radar completes the calibration signal reception and polarized variables extraction. Compared with the variables pre-defined by the calibration device, the systematic bias for radar polarized variable are determined. From September 16 to 20, 2019, the full link active calibration experiment was designed and carried out in the main campus of Chengdu University of information technology. The X-band dual polarization weather radar is located on the top of the school's information building. The calibration device adopted the high-precision radar target simulatorfrom Palindrome and is placed on a roof with a distance of 1.574km to the radar. The calibration project includes reflectivity, differential reflectivity and Doppler velocity. The results show that the reflectivity bias is 0.96dB, the differential reflectance bias is 0.8 dB, the Doppler velocity bias is 0.1 meter per second, and the azimuth positioning bias is 0.09 degree. The experimental results show that the full link active calibration method plays a positive role in promoting the development of dual-polarization weather radar calibration.
近20年来，中国部署了大量的气象业务雷达，这些雷达正在逐步升级为双极化气象雷达。极化变量在提高雷达数据质量、降水定量估计和水流星分类算法等方面发挥着重要作用。标定是双极化雷达成功应用的关键基础。目前，双极化气象雷达的标定方法主要有信号源法、太阳法、小雨法、金属球法等。本文采用全链路主动定标方法对双极化气象雷达进行定标。全链路主动校准装置首先接收雷达发射的水平极化波和垂直极化波，检索发射波形的时频特性，如脉冲波形、发射中心频率等信息。该装置根据获取的传输信息，快速生成具有特定距离、极化特性和多普勒信息的仿真目标。然后，通过Up转换和放大器模块，将标定信号传回雷达，雷达完成标定信号接收和极化变量提取。通过与标定装置预置的变量进行比较，确定了雷达极化变量的系统偏差。2019年9月16日至20日，在成都信息工程大学主校区设计并开展了全环节主动标定实验。x波段双极化气象雷达位于学校信息大楼楼顶。标定装置采用Palindrome高精度雷达目标模拟器，安装在距离雷达1.574km的屋顶上。校正方案包括反射率、差分反射率和多普勒速度。结果表明:反射率偏差为0.96dB，差分反射率偏差为0.8 dB，多普勒速度偏差为0.1 m / s，方位定位偏差为0.09度。实验结果表明，全链路主动定标方法对双极化气象雷达定标的发展具有积极的推动作用。
{"title":"A full link active calibration method and field experiment for dual polarization weather radar","authors":"Yu Shijie, Shi Zhao, Li Xuehua, Wang Xin, W. Xuejun","doi":"10.1109/ICMO49322.2019.9025953","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9025953","url":null,"abstract":"A large number of weather operational radars were deployed around China in the past twenty years, those radar aregradually being upgraded to dual-polarization weather radars. Polarized variables play an important role in improving radar data quality, quantitative precipitation estimate and hydrometeor classification algorithm. Calibration is the key basis for successful application of dual polarization radar. At present, the main calibration methods for dual polarization weather radar consist of signal source method, solar method, light rain method, metal ball method, etc. In this paper, a full link active calibration method is applied to calibrate the dual-polarization weather radar. The full link active calibration device first receives the horizontal polarization wave and vertical polarization wave transmitted by the radar, and retrieve the time-frequency characteristics of the transmitted waveform, such as pulse waveform, transmitted central frequency and other information. Based on the acquired transmission information, the device quickly generates the simulated target with specific distance, polarized characteristics and Doppler information. Secondly, through the Up conversion, and Amplifier modules, the calibration signal is transmitted back to the radar, then the radar completes the calibration signal reception and polarized variables extraction. Compared with the variables pre-defined by the calibration device, the systematic bias for radar polarized variable are determined. From September 16 to 20, 2019, the full link active calibration experiment was designed and carried out in the main campus of Chengdu University of information technology. The X-band dual polarization weather radar is located on the top of the school's information building. The calibration device adopted the high-precision radar target simulatorfrom Palindrome and is placed on a roof with a distance of 1.574km to the radar. The calibration project includes reflectivity, differential reflectivity and Doppler velocity. The results show that the reflectivity bias is 0.96dB, the differential reflectance bias is 0.8 dB, the Doppler velocity bias is 0.1 meter per second, and the azimuth positioning bias is 0.09 degree. The experimental results show that the full link active calibration method plays a positive role in promoting the development of dual-polarization weather radar calibration.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"114 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":"125851737","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/ICMO49322.2019.9025854
Wang Zhangwei, Chen Hao, Wang Han
In the process of strong convection, tornadoes, downbursts, hail, and thunderstorms are small in scale, and they are generated and dissipated quickly, which is an important reason for local weather disasters. Dual polarization weather radar is an important tool for meteorological monitoring. However, different types of dual polarization weather radar have certain shortcomings in small and medium scale weather detection. Based on the characteristics of different types of dual–polarization weather radars, this paper develops a radar detection system for small and medium–scale weather processes, and enhances the dual–polarization weather radar’s ability to detect small and medium–scale weather. By improving the space-time resolution of the new generation of dual-polarization radars in the S–band, and enhancing its own detection capabilities; at the same time developing multi–band, multi-model dual–polarization radar collaborative observation schemes, research and development of data fusion and weather warning systems, and observation data for multiple devices Carry out check and fusion of the same elements, and output the fused meteorological products and early warning information, so as to realize the strong convective storm warning, storm cell identification and tracking in the small and medium-scale weather system.
{"title":"Research on Improving Detection Capability of Small and Medium Scales Based on Dual Polarization Weather Radar","authors":"Wang Zhangwei, Chen Hao, Wang Han","doi":"10.1109/ICMO49322.2019.9025854","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9025854","url":null,"abstract":"In the process of strong convection, tornadoes, downbursts, hail, and thunderstorms are small in scale, and they are generated and dissipated quickly, which is an important reason for local weather disasters. Dual polarization weather radar is an important tool for meteorological monitoring. However, different types of dual polarization weather radar have certain shortcomings in small and medium scale weather detection. Based on the characteristics of different types of dual–polarization weather radars, this paper develops a radar detection system for small and medium–scale weather processes, and enhances the dual–polarization weather radar’s ability to detect small and medium–scale weather. By improving the space-time resolution of the new generation of dual-polarization radars in the S–band, and enhancing its own detection capabilities; at the same time developing multi–band, multi-model dual–polarization radar collaborative observation schemes, research and development of data fusion and weather warning systems, and observation data for multiple devices Carry out check and fusion of the same elements, and output the fused meteorological products and early warning information, so as to realize the strong convective storm warning, storm cell identification and tracking in the small and medium-scale weather system.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"69 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":"127274804","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/ICMO49322.2019.9026008
Ran Guo, Senlin Yang, Jiajia Mao, Xiaojie Huang, Yaqian Zhang, Xuefen Zhang, Shuqing Ma, Kebing Tang, Qingjie Liu, Wen Guo, Ming Zhang, Lixia Zhao, Dawei An
As the rapid development of high altitude long endurance UAV (HALE UAV) technology in China, it’s possible for China to carry out the offshore typhoon observation by HALE UAV with meteorological observing instruments installed on board. A new remotely controlled dropsonde system based on a certain type of HALE UAV has been designed and developed by Meteorological Observation Center of China Meteorological Administration(CMA MOC), in collaboration of AVIC Chengdu Aircraft Industrial (Group) Co. Ltd (AVIC CAC) and Beijing Institute of Radio Measurement(BIRM).This podded dropsonde system is capable of carrying up to 48 dropsondes and can support four simultaneous soundings provide in-situ atmospheric profiles of temperature, humidity, pressure, wind direction and wind speed data. Dynamic simulation test results show that, HALE UAV equipped with this dropsonde system can subsequently deploy the dropsondes from altitudes up to 12km safely and steadily. The prototype of the podded dropsonde system has already been equipped on the Medium altitude long endurance unmanned aerial vehicle system (MALE UAV), and carried out dropsonde observation for several times. According to the comparison and analysis of dropsonde data with the near collocated operational balloon radiosonde data shows that the real-time dropsonde data quality is reliable and stable. Further research can be executed on the offshore dropsonde observing experiment with the podded dropsonde system equipped on the HALE UAV to understand the characteristic of typhoon internal fine-scale structure by studying the real-time profile s, to improve the operational TC track and intensity predictions.
{"title":"Design and Preliminary Experiment of HALE UAV Podded Dropsonde System","authors":"Ran Guo, Senlin Yang, Jiajia Mao, Xiaojie Huang, Yaqian Zhang, Xuefen Zhang, Shuqing Ma, Kebing Tang, Qingjie Liu, Wen Guo, Ming Zhang, Lixia Zhao, Dawei An","doi":"10.1109/ICMO49322.2019.9026008","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026008","url":null,"abstract":"As the rapid development of high altitude long endurance UAV (HALE UAV) technology in China, it’s possible for China to carry out the offshore typhoon observation by HALE UAV with meteorological observing instruments installed on board. A new remotely controlled dropsonde system based on a certain type of HALE UAV has been designed and developed by Meteorological Observation Center of China Meteorological Administration(CMA MOC), in collaboration of AVIC Chengdu Aircraft Industrial (Group) Co. Ltd (AVIC CAC) and Beijing Institute of Radio Measurement(BIRM).This podded dropsonde system is capable of carrying up to 48 dropsondes and can support four simultaneous soundings provide in-situ atmospheric profiles of temperature, humidity, pressure, wind direction and wind speed data. Dynamic simulation test results show that, HALE UAV equipped with this dropsonde system can subsequently deploy the dropsondes from altitudes up to 12km safely and steadily. The prototype of the podded dropsonde system has already been equipped on the Medium altitude long endurance unmanned aerial vehicle system (MALE UAV), and carried out dropsonde observation for several times. According to the comparison and analysis of dropsonde data with the near collocated operational balloon radiosonde data shows that the real-time dropsonde data quality is reliable and stable. Further research can be executed on the offshore dropsonde observing experiment with the podded dropsonde system equipped on the HALE UAV to understand the characteristic of typhoon internal fine-scale structure by studying the real-time profile s, to improve the operational TC track and intensity predictions.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"9 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":"130715342","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/ICMO49322.2019.9026026
Lu Chao, Luo Hongyan, Yang Honglong, Zhang Qing, Zong Rong, Gao Ruiquan, Liu Yuewei, L. Yubao
By using a four dimensional data assimilation technology based on the nudging method, a real-time data assimilation system with horizontal resolution of 1km was established in Shenzhen, Guangdong Province to assimilate high-density and high-frequency observation data of Shenzhen and its surrounding areas, so as to form real-time reanalysis data. The quality evaluation of real-time reanalysis data was carried out by using the ground area automatic station and vertical wind profile data, the results showed that the real-time reanalysis data obtained from the system by assimilating multi-source and high-frequency data could effectively simulated the surface and vertical temperature and wind meteorological features of Shenzhen. Based on the real-time gridded reanalysis data set, Shenzhen Meteorological Bureau (SZMB) has released the real-time data products to the public through Wechat and SZMB official website, which has played an important role in natural ventilation evaluation of urban units. The current study showed that the Shenzhen real-time grid meteorological data products could be expected to provide scientific and technological support for finer scale urban monitoring and construction.
{"title":"Real-Time Gridding 3D Data by Using Four Dimensional Data Assimilation Technology: Construction and evaluation","authors":"Lu Chao, Luo Hongyan, Yang Honglong, Zhang Qing, Zong Rong, Gao Ruiquan, Liu Yuewei, L. Yubao","doi":"10.1109/ICMO49322.2019.9026026","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026026","url":null,"abstract":"By using a four dimensional data assimilation technology based on the nudging method, a real-time data assimilation system with horizontal resolution of 1km was established in Shenzhen, Guangdong Province to assimilate high-density and high-frequency observation data of Shenzhen and its surrounding areas, so as to form real-time reanalysis data. The quality evaluation of real-time reanalysis data was carried out by using the ground area automatic station and vertical wind profile data, the results showed that the real-time reanalysis data obtained from the system by assimilating multi-source and high-frequency data could effectively simulated the surface and vertical temperature and wind meteorological features of Shenzhen. Based on the real-time gridded reanalysis data set, Shenzhen Meteorological Bureau (SZMB) has released the real-time data products to the public through Wechat and SZMB official website, which has played an important role in natural ventilation evaluation of urban units. The current study showed that the Shenzhen real-time grid meteorological data products could be expected to provide scientific and technological support for finer scale urban monitoring and construction.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"29 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":"132999244","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/ICMO49322.2019.9025923
Liu Zongqing, Jin Haoran, Jiang Xiaopin, Zheng Wei, Peng Tao, Xie Xiaolin
Study and analyze the distribution of weather radar and the clearance environment in China. The SRTM elevation data was used to analyze the beam distance coverage and fixed elevation coverage of the national weather radar network. The statistical analysis of the radar coverage rate of the province in 2015 shows that the coverage rate of the weather radar station network in China has reached 61.54% (covering the land area). However, there is a significant density unevenness in the spatial distribution of weather radar networks, and there are large regional differences in coverage.
{"title":"Analysis of Clearance Environment Based on SRTM for China Weather Radar Network","authors":"Liu Zongqing, Jin Haoran, Jiang Xiaopin, Zheng Wei, Peng Tao, Xie Xiaolin","doi":"10.1109/ICMO49322.2019.9025923","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9025923","url":null,"abstract":"Study and analyze the distribution of weather radar and the clearance environment in China. The SRTM elevation data was used to analyze the beam distance coverage and fixed elevation coverage of the national weather radar network. The statistical analysis of the radar coverage rate of the province in 2015 shows that the coverage rate of the weather radar station network in China has reached 61.54% (covering the land area). However, there is a significant density unevenness in the spatial distribution of weather radar networks, and there are large regional differences in coverage.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"28 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":"127899140","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/ICMO49322.2019.9026158
J. Xu, Jianxin He, Qiangyu Zeng
The process of identifying the generation and development of tornadoes using weather radar data is conducive to improving the accuracy and time of early warning forecasts for tornadoes. The tornado recognition algorithm mainly determines the tornado occurrence and area of influence by identifying tornado vortex signature in velocity data. In this paper, firstly, the possible occurrence area of tornado is detected by the motion detection algorithm, secondly, the tornado vortex signature is recognized in this area, finally, the tornado occurrence position is determined by the fuzzy logic algorithm. In order to verify the effectiveness of the proposed algorithm, the tornado radar data collected in Jiangsu Province in the past ten years was used to detect the tornado location. Experimental results show that the proposed algorithm can more accurately identify tornadoes in weather radar data than TVS detection algorithms.
{"title":"Tornado Vortex Signature Recognition Algorithm based on Real-time Weather Radar Data","authors":"J. Xu, Jianxin He, Qiangyu Zeng","doi":"10.1109/ICMO49322.2019.9026158","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026158","url":null,"abstract":"The process of identifying the generation and development of tornadoes using weather radar data is conducive to improving the accuracy and time of early warning forecasts for tornadoes. The tornado recognition algorithm mainly determines the tornado occurrence and area of influence by identifying tornado vortex signature in velocity data. In this paper, firstly, the possible occurrence area of tornado is detected by the motion detection algorithm, secondly, the tornado vortex signature is recognized in this area, finally, the tornado occurrence position is determined by the fuzzy logic algorithm. In order to verify the effectiveness of the proposed algorithm, the tornado radar data collected in Jiangsu Province in the past ten years was used to detect the tornado location. Experimental results show that the proposed algorithm can more accurately identify tornadoes in weather radar data than TVS detection algorithms.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"39 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":"128838607","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/ICMO49322.2019.9026091
Yang Cao, Hongbin Chen, Debin Su, Yuchun Li, C. Lai
In this study, empirical AH-KDP and ADP-KDP relationship-based and self-consistent methods were used to correct the attenuation of reflectivity (zh) and differential reflectivity (ZDR) acquired from C- and X-bands dualpolarization radars, and the Zh of S-band Doppler radar was used to evaluate the results. The results indicated that, for Xband dual-polarization radar, the attenuation of Zh and ZDR could be corrected by two methods for heavy and moderate rain, and the distribution of Zh-ZDR scatters were closer to the theoretical relationship after self-consistent correction than that after empirical AH-KDP and ADP-KDP relationship-based correction. For light rain, similar results were obtained for two methods. For C-band dual-polarization radar, the degree of attenuation was less than X-band dual-polarization radar for the same intensity of rainfall, and the attenuation was need to be considered in heavy and moderate rain. For heavy rain, the distribution of Zh-ZDR scatters were closer to the theoretical relationship after empirical AH-KDP and ADP-KDP relationship based correction than that after self-consistent correction. For moderate rain, similar results were obtained for two methods. The corrected reflectivity of C-band dual-polarization radar was closer to that of S-band Doppler radar, however, for X-band dual-polarization radar, it was 5.10 dB larger than that of Sband Doppler radar in heavy rain, 4.64 dB in moderate rain, and 3.34 dB in light rain. It was consistent with the scattering simulation results of other scholars.
{"title":"Attenuation Correction of Reflectivity and Differential Reflectivity for Dualpolarization Radar","authors":"Yang Cao, Hongbin Chen, Debin Su, Yuchun Li, C. Lai","doi":"10.1109/ICMO49322.2019.9026091","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026091","url":null,"abstract":"In this study, empirical A<inf>H</inf>-K<inf>DP</inf> and A<inf>DP</inf>-K<inf>DP</inf> relationship-based and self-consistent methods were used to correct the attenuation of reflectivity (z<inf>h</inf>) and differential reflectivity (Z<inf>DR</inf>) acquired from C- and X-bands dualpolarization radars, and the Z<inf>h</inf> of S-band Doppler radar was used to evaluate the results. The results indicated that, for Xband dual-polarization radar, the attenuation of Z<inf>h</inf> and Z<inf>DR</inf> could be corrected by two methods for heavy and moderate rain, and the distribution of Z<inf>h</inf>-Z<inf>DR</inf> scatters were closer to the theoretical relationship after self-consistent correction than that after empirical A<inf>H</inf>-K<inf>DP</inf> and A<inf>DP</inf>-K<inf>DP</inf> relationship-based correction. For light rain, similar results were obtained for two methods. For C-band dual-polarization radar, the degree of attenuation was less than X-band dual-polarization radar for the same intensity of rainfall, and the attenuation was need to be considered in heavy and moderate rain. For heavy rain, the distribution of Z<inf>h</inf>-Z<inf>DR</inf> scatters were closer to the theoretical relationship after empirical A<inf>H</inf>-K<inf>DP</inf> and A<inf>DP</inf>-K<inf>DP</inf> relationship based correction than that after self-consistent correction. For moderate rain, similar results were obtained for two methods. The corrected reflectivity of C-band dual-polarization radar was closer to that of S-band Doppler radar, however, for X-band dual-polarization radar, it was 5.10 dB larger than that of Sband Doppler radar in heavy rain, 4.64 dB in moderate rain, and 3.34 dB in light rain. It was consistent with the scattering simulation results of other scholars.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"288 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":"128857768","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/ICMO49322.2019.9025973
Shen Chao, Li Wei, Cao Ting Ting
Meteorological Observation Center of China Meteorological Administration (hereinafter called the “MOC”) is an institution directly under the CMA, was established in November 2002. MOC has developed a lot of systems to carry out the national-level duties. Inevitably, such systems take with information and network security problems. In recent years, the Chinese government has promulgated a series of network security laws and regulations, stipulate that systems developed by government offices and public institutions must carry out information system network security classified protection and grading work, must take steps to evade the risks which conform to requirements of national information system network security classified protection (GB 17859-1999).To make sure the large number of common technical protection equipment and strategies matches the systems has been developed or needs to be built, MOC designed and constructed network security classified protection system with the purpose of establishing a universal security platform architecture, a reasonable division of security domains and a precisely configured protection equipment. According to the software and hardware technical indicators of the national information system network security classified protection secondary standard requirements, the related software and hardware devices are designed and deployed. The Network Security Classified Protection System Construction of MOC fully consider the problem of repeated construction, the continued linear expansion of this system and the sensitive data of policy-level protection.
{"title":"The Network Security Classified Protection System Construction of Meteorological Observation Center of China Meteorological Administration","authors":"Shen Chao, Li Wei, Cao Ting Ting","doi":"10.1109/ICMO49322.2019.9025973","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9025973","url":null,"abstract":"Meteorological Observation Center of China Meteorological Administration (hereinafter called the “MOC”) is an institution directly under the CMA, was established in November 2002. MOC has developed a lot of systems to carry out the national-level duties. Inevitably, such systems take with information and network security problems. In recent years, the Chinese government has promulgated a series of network security laws and regulations, stipulate that systems developed by government offices and public institutions must carry out information system network security classified protection and grading work, must take steps to evade the risks which conform to requirements of national information system network security classified protection (GB 17859-1999).To make sure the large number of common technical protection equipment and strategies matches the systems has been developed or needs to be built, MOC designed and constructed network security classified protection system with the purpose of establishing a universal security platform architecture, a reasonable division of security domains and a precisely configured protection equipment. According to the software and hardware technical indicators of the national information system network security classified protection secondary standard requirements, the related software and hardware devices are designed and deployed. The Network Security Classified Protection System Construction of MOC fully consider the problem of repeated construction, the continued linear expansion of this system and the sensitive data of policy-level protection.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"70 6 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":"123156263","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/ICMO49322.2019.9026133
Song Shuli, Chen Dongdong, Chen Weichao
The freezing-thawing state of soil directly affects the redistribution of soil energy and water, which is important to the state of climate. In addition, frozen soil observation has been widely used in climate monitoring, agricultural production, building planning, and railway construction and so on. As water changes resistance when it freezes, we designed an instrument that can determine the freezing–thawing state by measuring the resistance change between different spacers. The instrument designed in this paper is composed of three parts: frozen soil sensor, terminal and peripheral components. Pure water could be overcool when below zero, so we use tap water in the sensor. In order to determine the length of frozen soil, we set a series of measuring electrodes at an interval of 1cm. By measuring the change of electrical resistance caused by the phase change of non-purified water, the freezingthawing state of water layer between each pair of electrodes was detected and transformed into electrical resistance signals, after that, the collected AC conductivity signal was differentially sampled, and the RMS converter was used to convert it into DC signal. The input impedance is kept above megohm to ensure the minimum interference of the input signal. Frozen layer and frozen depth of soil were stored through mathematical transformation, and then the soil condition was obtained automatically. The automatic frozen soil observation instrument could not only connect with the computer terminal to form an independent observation system, but also be attached to the integrated hardware controller of the national surface meteorological observation station. Automatic data collection, quality control and upload of frozen soil observation were completed by ISOS. Its design inherits the observation principle and basic structure of the existing Danilin frozen soil instrument, and the overall structure design is scientific, safe and novel. From 2016 to 2019, comparative observation experiments were carried out in Juxian (Shandong province), Kenli (Shandong province), Kazuo (Liaoning province), Liaoyang (Liaoning province) and Manzhouli (Inner Mongolia). The test results show that the frozen depth variation of the automatic frozen soil observation is basically consistent with Danilin insturment. In addition, the freezing–thawing trend is almost the same. The consistency rate of frozen soil detestation between our device and the Danilin instrument is greater than 90%. It can satisfy the need of automatic observation work of frozen soil, and it can replace artificial observation of frozen soil layer and frozen soil depth.
{"title":"Design of an Automatic Frozen Soil Instrument Based on Resistance Change Caused by Water","authors":"Song Shuli, Chen Dongdong, Chen Weichao","doi":"10.1109/ICMO49322.2019.9026133","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026133","url":null,"abstract":"The freezing-thawing state of soil directly affects the redistribution of soil energy and water, which is important to the state of climate. In addition, frozen soil observation has been widely used in climate monitoring, agricultural production, building planning, and railway construction and so on. As water changes resistance when it freezes, we designed an instrument that can determine the freezing–thawing state by measuring the resistance change between different spacers. The instrument designed in this paper is composed of three parts: frozen soil sensor, terminal and peripheral components. Pure water could be overcool when below zero, so we use tap water in the sensor. In order to determine the length of frozen soil, we set a series of measuring electrodes at an interval of 1cm. By measuring the change of electrical resistance caused by the phase change of non-purified water, the freezingthawing state of water layer between each pair of electrodes was detected and transformed into electrical resistance signals, after that, the collected AC conductivity signal was differentially sampled, and the RMS converter was used to convert it into DC signal. The input impedance is kept above megohm to ensure the minimum interference of the input signal. Frozen layer and frozen depth of soil were stored through mathematical transformation, and then the soil condition was obtained automatically. The automatic frozen soil observation instrument could not only connect with the computer terminal to form an independent observation system, but also be attached to the integrated hardware controller of the national surface meteorological observation station. Automatic data collection, quality control and upload of frozen soil observation were completed by ISOS. Its design inherits the observation principle and basic structure of the existing Danilin frozen soil instrument, and the overall structure design is scientific, safe and novel. From 2016 to 2019, comparative observation experiments were carried out in Juxian (Shandong province), Kenli (Shandong province), Kazuo (Liaoning province), Liaoyang (Liaoning province) and Manzhouli (Inner Mongolia). The test results show that the frozen depth variation of the automatic frozen soil observation is basically consistent with Danilin insturment. In addition, the freezing–thawing trend is almost the same. The consistency rate of frozen soil detestation between our device and the Danilin instrument is greater than 90%. It can satisfy the need of automatic observation work of frozen soil, and it can replace artificial observation of frozen soil layer and frozen soil depth.","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":"124898442","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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