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载体处于高动态机动、障碍遮挡、信号干扰和多路径等复杂环境时,GNSS接收机跟踪环路易发生信号失锁和相位失调,导致载波相位观测值发生较大变化,采用载波相位平滑伪距将严重影响导航精度。为改善GNSS接收机导航性能,对电离层效应及延时校正模型进行了研究,基于α-β滤波算法提出了基于积分多普勒平滑伪距的导航算法。实验结果表明:采用该算法在静态、动态条件下定位精度优于5m,测速精度优于0.05m/s,可显著提高GNSS接收机的导航精度。
When the carrier is in a complex environment such as high dynamic maneuvering, obstacle obstruction, signal interference and multipath, the GNSS receiver tracking loop is prone to loss of signal and phase imbalance, resulting in large changes in the carrier phase observations. The carrier phase smoothing pseudo-range Seriously affect the navigation accuracy. In order to improve the navigation performance of GNSS receiver, the ionospheric effect and delay correction model are studied. Based on the α-β filtering algorithm, a navigation algorithm based on integrated Doppler smoothing pseudo-range is proposed. The experimental results show that the proposed algorithm has better positioning accuracy than 5m under static and dynamic conditions, and the speed accuracy is better than 0.05m / s, which can significantly improve the navigation accuracy of GNSS receivers.