一种无需精密钟差的实时精密单点定位方法

A real-time precise point positioning method without precise clock bias

提出一种基于少量参考站的无需外部钟差产品的非差实时精密单点定位(PPP)方法。该方法将参考站与流动站的共视卫星钟差项作为公共项联立观测方程,在估计流动站位置参数的同时将卫星钟差一并估计,从而无需等待服务器端解算的钟差产品,在客户端就可以单独完成实时PPP的解算。该方法在只有4个参考站参与解算的情况下,可使实时PPP精度达到厘米级,与同等条件下估计卫星钟差的PPP方法相比整体精度提高了28.8%;在只有2个参考站、甚至仅有1个参考站时,精度依然维持在厘米级。而在同等数量的参考站参与解算时,本文所提出的方法收敛速度也比估计卫星钟差的PPP方法的快。

A zero-difference real-time precise point positioning （PPP） method based on a few reference stations was proposed. Clock bias of common satellites was used as common parameter for establishing observation equation, and both clock bias and position parameter were estimated, so PPP can be carried out alone on client-side, without waiting for clock product on server-side. Using this method real-time PPP precision can reach centimeter-level when there are only four reference stations, which increases 28.8% compared with the PPP method estimating satellite clock bias. The precision can also keep in centimeter-level when there are only two reference stations, even one reference station. Meanwhile, the convergence speed of the proposed method was little faster than that of PPP method estimating satellite clock bias at the same number reference station.