基于北斗三频组合观测值的精密定位算法研究

Study on Precision Positioning Algorithm Based on the Triple Frequency Combination Observations of Bei Dou Navigation Satellite Sytem

北斗卫星导航系统可通过观测3个频率组合信号的相位值来获得定位信息。利用三频组合产生的频率具有组合噪声小和电离层延迟小的优点,可以有效地减少单频测量过程中产生的误差。在介绍三频导航观测模型和定位原理的基础上,利用三频载波相位观测值进行周跳探测,分析了导致模糊度产生的原因以及解算模糊度的3种算法,通过仿真,验证了利用无几何无电离层模型可以有效地实现对多频组合模糊度的解算。

The Bei Dou Navigation Satellite Sytem can obtain the positioning information by observing the phase values of the 3 frequency combination signals. The triple frequency combination frequency with small combined noise and small ionospheric delay,can effectively reduce the error in the measurement process of single frequency. Based on the introduction of the triple navigation observation model and the positioning principle,this paper uses triple frequency carrier phase observations for cycle slip detection,analyses the cause of the ambiguity and 3 algorithms for calculating the ambiguity,proves that the non-geometric and non-ionospheric model can effectively realize the solution of the multi-frequency combination ambiguity through the simulation.