基于GPS掩星的单频处理验证及精度分析  

Verification and Accuracy Analysis of Single-FrequencyProcessing Based on GPS Radio Occultation

作　　者：田浩然 孟祥广 杜起飞[1,2,3,4] 孙越强 白伟华[1,2,3,4] 王先毅 杨铭[1,2,3,4] 谭广远 胡鹏[1,2,3,4] TIAN Haoran;MENG Xiangguang;DU Qifei;SUN Yueqiang;BAI Weihua;WANG Xianyi;YANG Ming;TAN Guangyuan;HU Peng(National Space Science Center,CAS,Zhongguancun,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Beijing Key Laboratory of Space Environment Exploration,Beijing 100190,China;Key Laboratory of Environmental Space Situation Awareness Technology,CAS,Beijing 100190,China)

机构地区：[1]中国科学院国家空间科学中心,北京市100190 [2]中国科学院大学,北京市100049 [3]天基空间环境探测北京市重点实验室,北京市100190 [4]中国科学院空间环境态势感知技术重点实验室,北京市100190

出　　处：《大地测量与地球动力学》2023年第7期750-754,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(42074042,41775034)。

摘　　要：基于FY-3E卫星上的GPS掩星观测数据对单频掩星处理算法进行验证并分析其精度。首先由L_1频点的载波相位观测和伪距观测C_1计算出相对电离层TEC(relTEC);然后重构第二频点的载波相位观测L_(2)^(*),并反演大气折射率产品;最后验证和分析单频相对电离层电子总含量relTEC、重构L_(2)^(*)附加相位和折射率产品的精度。结果表明:1)单频计算得到的relTEC和L_(2)^(*)附加多普勒与双频结果的相关性系数多数大于0.95;2)L_(2)^(*)附加多普勒的相对平均偏差多数小于0.2%,相对标准差多数小于0.4%;3)单、双频反演折射率相对ERA5数据的bias和RMS指标一致性良好,位势高度在25 km以上单频反演的折射率精度相比双频有微弱降低。Based on the GPS radio occultation observations on the FY-3E satellite,we verify the single-frequency radio occultation processing algorithm and analyze its accuracy.Firstly,we calculate the ionospheric relative TEC(relTEC)by the carrier phase observation of L 1 frequency point and pseudo-range observation C 1.Then we reconstruct the carrier phase observation L_(2)^(*) of the second frequency point,and invert the atmospheric refractive index products.Finally,we verify and analyze the accuracy of single-frequency relTEC,reconstructed L_(2)^(*) excess phase and refractive index products.The results show that:1)The correlation coefficients between the relTEC and L_(2)^(*) excess phases obtained by the single-frequency calculation and the dual-frequency results are greater than 0.95.2)The relative average deviation of L_(2)^(*) excess phase Doppler is less than 0.2%,and the relative standard deviation is less than 0.4%.3)Compared with the ERA5 data,the bias and RMS of the single/dual frequency refractive index inversion are in good agreement.The refractive index accuracy of single-frequency inversion with a geopotential height of over 25 km is slightly reduced compared to that of dual-frequency inversion.

关 键 词：GPS掩星 单频处理 附加相位 折射率 

分 类 号：P228[天文地球—大地测量学与测量工程]