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| Tropospheric Wet Refractivity Tomography Based on the BeiDou Satellite System简 | |
| 作者姓名： | WANG Xiaoying WANG Xianliang DAI Ziqiang KE Fuyang CAO Yunchang WANG Feifei and SONG Lianchun |
| 基金项目： | supported by the National Basic Research;Development (973) Program of China (Grant No. 2012CB955903);the National Natural Science Foundation of China (Grant No. 20907047 and Grant No. 71373131);National Industry-specific Topics (Grant No.GYHY 201406078) |
| 摘 要： | This paper presents a novel approach for assessing the precision of the wet refractivity field using BDS （BeiDou navigation satellite system） simulations only,GPS,and BDS＋GPS for the Shenzhen and Hongkong GNSS network.The simulations are carried out by adding artificial noise to a real observation dataset.Instead of using the δ and σ parameters computed from slant wet delay,as in previous studies,we employ the Bias and RMS parameters,computed from the tomography results of total voxels,in order to obtain a more direct and comprehensive evaluation of the precision of the refractivity field determination.The results show that：（1） the precision of tropospheric wet refractivity estimated using BDS alone （only 9 satellites used） is basically comparable to that of GPS; （2） BDS＋GPS （as of current operation） may not be able to significantly improve the data＇s spatial density for the application of refractivity tomography; and （3） any slight increase in the precision of refractivity tomography,particularly in the lower atmosphere,bears great significance for any applications dependent on the Chinese operational meteorological service. |
| 关 键 词： | 北斗导航卫星系统 折射率场 层析成像 对流层 模拟精度 全球定位系统 计算参数 BDS |
Tropospheric wet refractivity tomography based on the BeiDou satellite system |
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| WANG Xiaoying,WANG Xianliang,DAI Ziqiang,KE Fuyang,CAO Yunchang,WANG Feifei,and SONG Lianchun.Tropospheric wet refractivity tomography based on the BeiDou satellite system[J].Advances in Atmospheric Sciences,2014,31(2):355-362. | |
| Authors: | Xiaoying Wang Xianliang Wang Ziqiang Dai Fuyang Ke Yunchang Cao Feifei Wang Lianchun Song |
| Institution: | 1. School of Remote Sensing, Nanjing University of Information Science & Technology, Nanjing, 210044, China 2. Key Laboratory of Land Environment and Disaster Monitoring, National Administration of Surveying, Mapping and Geoinformation, Xuzhou, 221116, China 3. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China 4. The 28th Research Institute, China Electronics Technology Group Corporation, Nanjing, 210007, China 5. Meteorological Observation Center, China Meteorological Administration, Beijing, 100081, China 6. National Climate Center, China Meteorological Administration, Beijing, 100081, China |
| Abstract: | This paper presents a novel approach for assessing the precision of the wet refractivity field using BDS (BeiDou navigation satellite system) simulations only, GPS, and BDS+GPS for the Shenzhen and Hongkong GNSS network. The simulations are carried out by adding artificial noise to a real observation dataset. Instead of using the d and s parameters computed from slant wet delay, as in previous studies, we employ the Bias and RMS parameters, computed from the tomography results of total voxels, in order to obtain a more direct and comprehensive evaluation of the precision of the refractivity field determination. The results show that: (1) the precision of tropospheric wet refractivity estimated using BDS alone (only 9 satellites used) is basically comparable to that of GPS; (2) BDS+GPS (as of current operation) may not be able to significantly improve the data’s spatial density for the application of refractivity tomography; and (3) any slight increase in the precision of refractivity tomography, particularly in the lower atmosphere, bears great significance for any applications dependent on the Chinese operational meteorological service. |
| Keywords: | slant wet delay tomography BeiDou algebraic reconstruction techniques(ART) wet refractivity GPS |
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