北斗二号伪距偏差特性分析及其对定位的影响

伪距偏差是指因卫星下行导航信号非理想状态,导致不同技术状态的终端在接收同一卫星导航信号时产生不同的测距偏差,而现有伪距改正手段尚未考虑该偏差,甚至在双频定位时还会被进一步放大.基于Curtin GNSS研究中心设置的零基线接收机,使用接收机零基线差分解算多组观测终端下北斗二号卫星的伪距偏差,分析其特性,并采用标准单点定...

Analysis of BDS-2 Pseudorange Bias and Its Effects on BDS-only Standard-Positioning

Pseudorange bias is the ranging deviation generated when terminals in different technical states receive the same satellite navigation signal as a result of the non-ideal state of satellite downlink navigation signal, and the deviation has not been taken into account by the existing pseudorange correction methods and even been amplified in dual-frequency positioning. We use zero-baseline difference decomposition to calculate the pseudorange bias of BDS-2 satellites under multiple observation terminals using the zero-baseline receivers set up by Curtin GNSS Research Center to analyze its characteristics, and use the standard single point positioning to test the positioning accuracy variation after the correction of pseudorange bias. Results show that the pseudorange bias of each satellite at different signal frequency can reach up to 20cm, and the pseudorange bias of B2 singal is generally smaller than that of B1. After the correction of pseudorange bias, the maximum increases of standard point positioning accuracy in U direction and three-dimensional direction are 7.9% and 5.1% respectively.