BDS/GPS双系统软件接收机实现与性能分析

Implementation and Performance of BDS/GPS Dual-System Software Receiver

在经典的MATLAB GPS软件接收机的基础上,针对快速比特跳变的BDS信号给出了捕获跟踪和解帧策略,提出了BDS/GPS双系统伪距、载波相位、多普勒和载噪比观测量提取算法,推导了双系统定位定速的迭代式。采用NSL-STEREO射频前端采集实际的BDS B1和GPS L1双系统数字中频信号,设计了楼顶静态和动态实验,比较分析了实际场景下BDS/GPS双系统及各单系统的定位轨迹、定位定速误差和精度因子,验证了接收机性能并得到系统差异结论。

On the basis of the classical MATLAB GPS software receiver, an acquisition/tracking and frame deco-ding strategy is present for BDS signal with rapid sign transitions. What’ s more, an observations extraction algo-rithm for BDS/GPS dual-system is proposed, including pseudo-range, carrier phase, doppler and carrier-to-noise-ratio. After that, the derivatives of dual-system position and velocity iterative equations are given. The NSL-STEREO front-end is employed to grab real intermediate frequency signal containing BDS B1 and GPS L1 parts, and a static and a dynamic experiment on the roof are designed. The ground tracks, position/velocity errors and di-lution of precisions of BDS/GPS dual-system and each single system are compared and analyzed. The results vali-date the performance of the software receiver, and indicate the difference between systems.