北斗载波相位差分的高频测速

High frequency speed measurement based on BDS carrier phase difference

针对GNSS测速方法中,传统单站历元间伪距单点定位位置差分及原始多普勒观测实时估计载体速度精度较低的问题,该文通过GNSS模块输出的载波相位观测值,根据相位中心一阶差分导出多普勒观测值的方法、同时系统地分析参数估计中各项误差源的影响,最后通过多普勒测速原理实时估计载体的速度信息。实验结果表明,该文所采用的方法静态模式下精度可以达到1~2mm/s,动态情况下测速精度可以达到5cm/s,较好地满足了机械控制领域的测速需求。

Aiming at the problem of the GNSS speed measurement method that the single-station epoch pseudo-range single-point positioning position difference and the original Doppler observation real-time estimation carrier speed accuracy was low.In this paper,the method of deriving Doppler observations by first-order difference of carrier phase center,the influence of various error sources had been researched in parameter estimation of the system,Finally,determining the velocity of the carrier according to the Doppler velocity measurement principle.The experimental results showed that the accuracy of the method could reach 1~2mm/s in static mode,and the accuracy of speed measurement could reach 5cm/s under dynamic conditions,which satisfied the speed measurement requirements in the field of mechanical control.