Strategy of Data Processing for GPS Rover and Reference Receivers Using Different Sampling Rates
Strategy of Data Processing for GPS Rover and Reference Receivers Using Different Sampling Rates
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GPS流动站和参考接收机不同采样率的数据处理策略
DOI：
10.1109/tgrs.2010.2070509
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发表时间：
2011-03-01
影响因子：
8.2
通讯作者：
Yuan, Yunbin
中科院分区：
文献类型：
--
作者：
Wang, Haitao;Ou, Jikun;Yuan, Yunbin
在全球定位系统（GPS）应用中，常常采用双差（DD）模型，这要求基准站和流动站接收机采用相同的采样率。在满足需求的前提下，全球导航卫星系统网络中现有的低采样率静态接收机能否用作高采样率流动站的基准呢？如果可行，如何处理这类数据呢？本文提出了一种后处理综合方案来处理这类数据，即初始化之后，当有同步数据时，同时采用单差（SD）和双差（DD）模型，而当只有流动站接收机数据时，则只使用单差模型。在同步历元，单差模型结果与双差模型结果的偏差可视为累积的系统误差，可将其线性内插到该区间的各个非同步历元。该策略充分利用了所有可用观测值，而不是丢弃非同步GPS数据，为精密动态单点定位提供了一种有前景的应用。通过采用连续运行参考站或其他类似GPS网络的低采样率接收机作为基准站，测量任务的总成本将大大降低。对一组飞机飞行实验数据进行了处理以验证新算法，结果表明定位精度可达到厘米级。
In Global Positioning System (GPS) applications, the double-difference (DD) model is often employed, which requires that the reference station and the rover receivers adopt the same sampling rate. On the premise of the need fulfillment, could the existing static receivers of Global Navigation Satellite System networks with a low sampling rate be used as the references for the rover with a high sampling rate? If feasible, how to process such data? In this paper, an integrated processing scheme is presented to deal with such data in the posterior mode, i.e., after initialization, both the single-difference (SD) and the DD models will be employed when synchronous data are available, while only the SD model will be used when only the rover receiver data are obtained. The deviations of the results obtained with the SD model from those with the DD model at the synchronous epoch might be considered as the accumulated systematical errors, which could be linearly interpolated into individual nonsynchronous epochs of that interval. This strategy takes full advantage of all available observations, rather than discarding the nonsynchronous GPS data, and it provides a promising application for the precise kinematic point positioning. The total expense of the surveying mission will be greatly reduced by adopting the low-sampling-rate receivers of the Continuously Operating Reference Station or the other similar GPS network as the reference stations. A data set of an airplane flight experiment was processed to verify the new algorithm, and the results revealed that the positioning accuracy could reach a centimeter level.