一种基于BDS三频观测量的精密单点定位算法

A novel algorithm of precise point positioning based on BDS triple-frequency observations

针对传统双频BDS精密单点定位收敛速度及定位精度如何进一步提高的问题,该文提出了一种基于两组消电离层组合的BDS新三频精密单点定位(PPP)定位算法,并且对由于引入第3个频段观测量所导致的函数和随机模型与传统双频PPP模型存在的差异进行了公式推导。最后利用实测数据以动态和静态模式对新三频PPP模型进行了测试,以传统双频PPP解算结果为参照,对新三频PPP模型的收敛速度及定位精度进行了评估分析。基于实测数据的测试结果表明,新三频算法有利于提升定位解算的精度并有效缩短初始收敛过程,而且这一改善效果在动态模式下较静态模式更为显著。

Aiming at the problem of how to shorten the convergence time and improve the positioning accuracy of traditional dual-frequency BeiDou navigation satellite system(BDS)precise point positioning(PPP),this paper presented a novel algorithm of triple-frequency BDS PPP based on two ionosphere-free combinations.Differences on the formula of function and stochastic model between traditional dualfrequency and the novel triple-frequency model due to introducing a third frequency observations were also modified and updated in the PPP model.Finally,the novel triple-frequency BDS PPP model presented in this paper were tested in both static and kinematic solution modes by using measured data.The convergence time and positioning accuracy of the triple-frequency PPP model was assessed by comparing with the results of the traditional dual-frequency PPP model.The results showed that the novel triplefrequency PPP algorithm could not only improve the positioning accuracy but also shorten the convergence time;these advantages were more obvious in kinematic mode PPP than in static mode PPP.