COSMIC-2掩星观测与大气反演廓线质量分析

Analysis of COSMIC-2 Radio Occultation Observations and Atmospheric Profiles

    摘要
  • 摘要: COSMIC-2(constellation observing system for meteorology ionosphere and climate-2)作为COSMIC掩星星座的后续计划,得益于升级了支持多模GNSS信号的接收机和高增益定向波束掩星天线,其观测数据质量和数量得到显著提升。围绕掩星观测数据和反演产品的定量评估,分析COSMIC-2定轨和掩星天线的原始观测数据质量,并以欧洲中期数值天气预报中心的再分析气象资料为基准,定量评估掩星反演大气廓线产品质量。结果显示,COSMIC-2定轨天线L1频段信噪比大多在45 dB以上,其对应伪距多路径效应中误差在0.2~0.4 m之间；掩星天线观测信噪比由第一代COSMIC的不足700 v/v大幅提升至1 200 v/v,且GLONASS掩星廓线和GPS掩星廓线均与气象再分析资料表现出了很好的一致性。研究结果认为,升级后的COSMIC-2掩星载荷不仅大幅增加掩星观测数量,其高增益的掩星天线设计还有效地提升了掩星观测数据质量,为大气科学研究提供了重要气象观测资料。

     

    Abstract:
    Objectives COSMIC-2 constellation, as the follow-on mission of constellation observing system for meteorology ionosphere and climate(COSMIC), has refined the radio occultation (RO) payloads with multi-GNSS signals support and high-gain beam-forming RO antennas, which will improve both the quantity and quality of the RO observations.
    Methods We focus on the input observations and output profiles of the RO retrieval, evaluating the raw observations from both precise orbit determination (POD) and RO antennas, and accessing the atmospheric profiles using ECMWF (European Centre for Medium-Range Weather Forecasts) reanalysis products as reference.
    Results The results show that the L1 signal-to-noise ratio (SNR) on COSMIC-2 POD antennas are mostly above 45 dB, and the corresponding pseudo-range multipath standard deviation errors are between 0.2 m and 0.4 m. The SNR values on RO antenna are significantly improved from less than 700 v/v on COSMIC to 1 200 v/v on COSMIC-2, and both the GLONASS and GPS RO profiles show good consistency with ECMWF reanalysis products.
    Conclusions The updated COSMIC-2 RO payloads can increase the profile number, and also the quality of RO profiles can be significantly improved with high-gain antennas, which will provide important observations for atmospheric scientific research.

     

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