摘要
给出了星载双频GPS观测数据降采样处理方法。伪码观测精度较低,在降采样过程中采用不同的平滑方法对伪码的精度影响较大。首先阐述了观测数据的降采样原理,给出多项式平滑伪距和载波相位平滑伪距方法,分析了两种方法的优缺点;然后通过伪码数据质量评估结果来分析不同平滑方法对伪码观测精度的贡献。最后通过对模拟器输出的1 Hz星载双频GPS模拟数据的降采样处理,验证了降采样方法的正确性。结果表明两种平滑方法均能显著地提高降采样后的伪码观测精度,其中载波相位平滑方法效果更加优越。
A desampling method for onboard dual frequency GPS observation is presented. Compared with the phase, the code accuracy is much lower, thus different smoothing methods affect the code accuracies in the desampling. Firstly, the observation desampling principle is in- vestigated, polynomial smoothing pseudo-range and carrier phase smoothing pseudo-range methods are introduced. The advantage and disadvantage of the two methods are analyzed. Then, the contribution of the two methods to the code accuracy is analyzed by the code quality estimation. Finally, 1 Hz observation output on onboard dual frequency GPS simulator verifies the validity of the desampling method. Results show that both the methods can improve the code quality after desampling, thus the performance of the carrier phase smoothing pseudo- range method is effective.
出处
《数据采集与处理》
CSCD
北大核心
2010年第1期98-101,共4页
Journal of Data Acquisition and Processing
基金
国防预研基金(9140A22040508KG01)资助项目
航天支撑技术基金(2006-HT-GFKD)资助项目
关键词
星载双频GPS
降采样
载波相位平滑伪距
onboard dual frequency GPS
desampling
carrier phase smoothing pseudo-range
