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COSMIC-2近实时廓线反演对流层延迟及其质量分析

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为了进一步提高全球大气探测和极端天气预报的精度,提出一种气象、电离层与气候星座观测系统2代(COSMIC-2)近实时廓线反演对流层延迟方法:指出随着气象、电离层与气候星座观测系统2代(COSMIC-2)掩星探测深度的加深,通过掩星手段为地表全球卫星导航系统(GNSS)观测站提供近实时先验天顶对流层延迟(ZTD)产品成为可能;采用COSMIC-2掩星Level 2近实时产品wetPf2大气湿度廓线获取掩星ZTD,并以欧洲中期数值天气预报中心第五代再分析资料(ERA5)作为参考,分高程、纬度、季节评估其反演精度.结果表明,COSMIC-2掩星反演天顶对流层延迟ZTD整体精度较高,10 km高程以下全球定位系统(GPS)信号反演ZTD精度较格洛纳斯卫星导航系统(GLONASS)信号更优;掩星反演ZTD精度随高程增加而提升,在0～1 km高程范围内精度最低,均方根(RMS)分别为11.33 mm(GPS)、11.54 mm(GLONASS);中低纬度区域(25°N—35°N)反演ZTD精度低于低纬(15°N—25°N)和中纬(35°N—45°N)区域,其中中纬区域精度最高,RMS分别为4.74 mm(GPS)、4.70 mm(GLONASS);掩星反演ZTD精度同样受季节影响,GPS/格洛纳斯全球卫星导航系统(GLONASS)双模信号均在夏季反演精度最差,冬季反演精度最高,冬季RMS分别为4.15 mm(GPS)、4.18 mm(GLONASS).
Quality analysis of retrieval zenith tropospheric delay from COSMIC-2 near real-time radio occultation profile
In order to further improve the accuracy of global atmospheric detection and extreme weather forecasting,the paper proposed a retrieval method of zenith tropospheric delay from the constellation observing system for meteorology ionosphere and climate-2 (COSMIC-2) near real-time radio occultation profile:it was pointed that with the deepening of COSMIC-2 radio occultation (RO) detection depth,it became feasible to provide priori near-real-time zenith tropospheric delay (ZTD) products for ground-based global navigation satellite system (GNSS) observation stations through radio occultation ways;then,the retrieval ZTD obtained through the near-real-time COSMIC-2 Level 2 product wetPf2 was evaluated with the fifth reanalysis data of European Centre for Medium-Range Weather Forecasts (ERA5) as a reference,and the evaluation was conducted considering elevations,latitudes and seasons.Results showed that the overall accuracy of retrieval ZTD using COSMIC-2 would be high,and the overall accuracy for global positioning system (GPS) signal would be better than that of global navigation satellite system (GLONASS) signal under 10 km elevation;the accuracy of retrieval ZTD could be improved with increasing elevation,with the lowest accuracy in the range of 0～1 km elevation,where root mean square (RMS) would be 11.33 mm (GPS) and 11.54 mm (GLONASS);in the mid-low latitude range (25°N-35°N),the retrieval ZTD accuracy would be lower compared to low latitudes (15°N-25°N) and mid latitudes (35°N-45°N) regions,with the highest accuracy in the mid-latitude region,where RMS would be 4.74 mm (GPS) and 4.70 mm (GLONASS);moreover,the retrieval ZTD could be also affected by seasonal variations,with both GPS and GLONASS signals showing the worst accuracy in summer and the highest accuracy in winter (RMS:GPS 4.15 mm,GLONASS 4.18 mm).

constellation observing system for meteorology ionosphere and climate-2 (COSMIC-2)global navigation satellite system (GNSS) near real-time radio occultationzenith tropospheric delayquality analysis

胡方鑫、叶世榕、罗佳、夏朋飞、曾旭平、马鑫程

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武汉大学 测绘学院,武汉 430079

武汉大学 卫星导航定位技术研究中心,武汉 430079

中交公路规划设计院有限公司,北京 100010

气象、电离层与气候星座观测系统2代(COSMIC-2) 全球卫星导航系统(GNSS)近实时掩星 天顶对流层延迟 质量分析

中交公规院科技创新专项福建省高新技术与工业科技引导性资助项目

C22030A2022H0030

2024

10.16547/j.cnki.10-1096.20240504

导航定位学报

导航定位学报

CSTPCD北大核心
影响因子：0.72
ISSN：
年,卷(期)：2024.12(5)