Abstract—

This study analyses the GPS velocity estimation performances of three different estimation models, namely, the time-differenced carrier phase velocity estimation (TDCPVE), Doppler observation velocity estimation (DopplerVE), and precise point positioning velocity estimation (PPPVE). Static and vehicle kinematic experiments are conducted for validation. Under simulated kinematic conditions using static data, the accuracy of the DopplerVE is the worst, and the precision of the velocity by the PPPVE is the same as with the TDCPVE. Under kinematic conditions, the accuracies of the three methods are related to the motion state of the mobile carrier (such as its acceleration and turning). When the sampling interval is 1 s, the TDCPVE can obtain precise velocity using a single-frequency stand-alone GPS receiver; the TDCPVE and DopplerVE can obtain accuracies of the same order of magnitude with broadcast and precise ephemerides, and can be used for real-time velocity measurement; the PPPVE can obtain not only an accurate position, but also an accurate velocity.

中文翻译：

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三种不同估算模型获得的GPS速度比较

摘要—

这项研究分析了三种不同的估计模型的GPS速度估计性能，即时差载波相位速度估计（TDCPVE），多普勒观测速度估计（DopplerVE）和精确点定位速度估计（PPPVE）。进行静态和车辆运动学实验以进行验证。在使用静态数据的模拟运动条件下，多普勒误差的精度最差，而PPPVE的速度精度与TDCPVE相同。在运动学条件下，这三种方法的精度与移动载体的运动状态（例如其加速和转弯）有关。当采样间隔为1 s时，TDCPVE可以使用单频独立GPS接收器获得精确的速度。TDCPVE和DopplerVE可以通过广播和精确星历获得相同数量级的精度，并可用于实时速度测量；PPPVE不仅可以获得准确的位置，而且可以获得准确的速度。