BDS-2和BDS-3系统间伪距分层及其技术对策

Analysis and solution of pseudorange layering between BDS-2 and BDS-3 systems

BDS-2和BDS-3卫星不仅存在与其他导航系统一样的星间伪距偏差问题,还存在两个系统之间的分米级伪距分层现象。为了最大限度降低伪距分层影响,本文选用两台环路参数可配置的接收机进行试验分析,分析了接收机环路参数设计与伪距分层的影响关系。结果表明,当接收机选择0.3 chip及以上的相关器码间距来跟踪B1I信号时,能使BDS-2和BDS-3之间B1I信号的伪距分层由分米级降低到厘米级;对于B3I信号而言,则需要采用0.6 chip及以下的相关器码间距来进行跟踪。根据本文研究可知,通过配置合理的接收机相关器码间距值跟踪B1I/B3I信号,可以使BDS-2和BDS-3之间的伪距分层现象得到明显改善,同时也能提高接收机定位精度的一致性。本文研究对推进北斗导航接收机和芯片的发展与完善具有参考意义。

BDS-2 and BDS-3 satellites not only have the same problem of pseudorange bias as other navigation systems,but also have the decimeter-level pseudorange layering between the two systems.In order to minimize the influence of pseudorange layering,two receivers with configurable loop parameters are selected for experimental analysis,and the influence relationship between the design of receiver loop parameter and pseudorange layering is analyzed.The results show that the pseudorange layering of B1I signal between BDS-2 and BDS-3 can be reduced from decimeter-level to centimeter-level when the correlator spacing parameter configuration value of 0.3 chip and above is selected to track the B1I signal.For B3I signal,the correlator spacing parameter of 0.6 chip and below is required for tracking.According to the research in this paper,the pseudorange layering problem between BDS-2 and BDS-3 can be significantly improved by tracking the B1/B3I signal with a reasonable correlator spacing value.At the same time,it can also reduce the relative deviation positioning accuracy between receivers.The research in this paper has reference significance for promoting the development and improvement of BeiDou navigation receivers and chips.