北斗二代导航型接收机数据预处理策略

Data Pre -processing Strategy of BeiDou 2nd Generation Navigation Receiver

北斗接收机的定位精度关系到整机的应用性能。本文讨论了北斗二代导航型接收机在研制中的定位精度评估及定位精度稳定性等问题，就导航电文误码处理、伪距异常处理、低仰角过滤等方面提出采取适当措施以降低参与解算的数据误差，提高整机定位精度的稳定性，并利用外符合精度和95％置信度对静态和动态车载条件下定位结果分别进行了精度评估。实验结果表明，采取定位精度稳定策略后，北斗二代导航型接收机水平定位精度优于5m，高程定位精度优于6m，高于北斗二代系统提出的定位精度指标。

Positioning accuracy has a great influence on the whole performance of receivers. Positioning accuracy evaluation method and accuracy stabilization strategies in BeiDou 2nd generation navigation receiver development are discussed in this paper. Navigation message error code disposing, pseudo - range exception processing and low elevation filtering have been used to reduce data error occurred in calculation, and stabilize the whole receiver positioning accuracy. The positioning accuracies under static and dynamic vehicle - mounted conditions are evaluated respectively with outer precision and 95% confidence. Experiment results show that the BeiDou 2nd generation navigation receiver＇ s horizontal positioning accuracy is better than 5m and the vertical positioning accuracy is better than 6m after utilizing stabilization strategies. Those results are better than the positioning accuracy target proposed by BeiDou 2nd generation system.