Galileo校正卫星天线参数特性及对PPP定位的影响

Characteristics of Galileo Calibrated Satellite Antenna Parameter and Their Impacts on Precise Point Positioning

    摘要
  • 摘要: 与先期采用消电离层组合仅估计相位中心偏差(phase center offset, PCO)参数不同，欧洲的伽利略（Galileo）系统发布的地面校正的卫星天线参数基于原始频点，且包含天线相位中心变化(phase center variation, PCV)参数。为此，分析了校正的卫星天线参数特性，发现其水平向PCO与卫星类型相关，FOC(full operational capability)卫星的PCV参数较IOV(in-orbit validation)卫星稳定，仅依赖天底角。利用20个MGEX (multi-GNSS experiment)测站连续15 d的数据分析校正天线参数对双频组合/ 非组合精密单点定位（precise point positioning, PPP）的影响, 并与消电离层天线参数的定位结果比较，结果表明，其水平方向精度基本一致，双频组合PPP高程方向的精度提高约6.3%，双频非组合高程方向的精度提高约11.9%，基于原始频点的校正天线参数在双频非组合PPP定位中表现出更优的自洽性。

     

    Abstract:
      Objectives  The ground calibrated antenna phase center offset (PCO) and phase center variation (PCV) for European global navigation satellite Galileo have been released. Compared with in-orbit estimated PCO and PCV, the calibrated counterparts are frequency-dependent and satellite-dependent. The characteristics of calibrated satellite antenna parameters are needed to be analyzed.
      Methods  Firstly, we compare the antenna parameter of different type satellites, in-orbit validation (IOV) satellite and full operational capability (FOC) satellite. Secondly, we use data from 20 MGEX (multi-GNSS experiment) stations for 15 consecutive days, the effects of calibrated antenna parameters on dual-frequency combined/uncombined precise point positioning (PPP) are studied.
      Results  Experiment results show that the horizontal PCO (h-PCO) are type-dependent, PCV of FOC satellite are more stable than those of IOV satellite and only dependent on the nadir angle. Compared with the positioning results of estimated antenna parameters, the positioning accuracy in horizontal direction is equivalent. The height accuracy based on ionospheric-free combination observation is improved by about 6.3%, those based on dual-frequency uncombined observation is improved by about 11.9%.
      Conclusions  The calibrated antenna parameters based on the individual frequency show better self-consistency in dual-frequency uncombined PPP.

     

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