基于不同参考框架的GPS卫星天线校验

Calibration of GPS Satellite Antenna Based on Different Reference Frames

摘要:

重新估计了基于不同参考框架的GPS卫星天线 PCO(相位中心偏差)和PCV(相位中心变化)参数.计算过程中，通过固定测站天线的PCO和PCV，并将测站坐标强约束至不同的参考框架之下，降低了GPS卫星天线参数和接收机天线参数以及参考框架参数之间的相关性.结果显示，基于不同参考框架的同类型卫星天线PCV差异的平均值为0.726 mm；与IGS发布值差异的平均值为0.844 mm；基于新公布的IGS14参考框架的GPS卫星天线PCO估计结果与IGS (国际GNSS服务）发布值差异的平均值为-14.4 mm，基于IGb08参考框架的卫星天线PCO估计结果与IGS发布值差异的平均值为-16.8 mm.以上结果表明，本措施提高了GPS卫星相位中心PCO/PCV的一致性，从而也能提高GNSS(global navigation satellite system) 技术用于框架传递的连续性.

Abstract:

GPS satellites antenna PCO(phase center offset) and PCV(phase center variation) were reestimated based on station coordinates under different reference frames. The correlations among GPS satellite antenna parameters, receiver antenna parameters and reference frame scales were reduced by fixing receiver antenna PCO/PCV and constraining station coordinate to given reference frame tightly. Results show that the mean difference of blockspecific satellite antenna PCV based on different reference frames is 0.726 mm. Comparing with the satellite antenna PCV released by IGS based on IGS00, the mean blockspecific PCV difference between IGS value and the reestimated is 0.844 mm. Comparing to the IGS values, GPS reestimated satellite antenna PCO has an average bias of -14.4 mm and -16.8 mm for the reestimated satellite antenna PCO based on IGS14 and IGS08, respectively. The reestimated PCO/PCV values could improve their inerconsistency and contribute to the GNSS based reference frames densification.