面向嵌入式应用领域的GPS接收机设计

Design of GPS receiver for embedded application field

本文基于GPS接收机射频前端和基带相关器模块,设计了面向嵌入式应用的GPS接收机软件。为了适应于高动态或其他恶劣条件,设计了双模态的载波跟踪环路:一种是适用于高动态的FLL辅助的PLL;另一种是适用于低动态的PLL。可以根据锁定卫星信号的情况来进行模态之间切换。在静态条件下和动态车载条件下实验验证了所实现的嵌入式GPS接收机。实验结果表明:在静态条件下,位置精度优于5m(标准差),速度精度优于0.1m/s(标准差);在车载实验中,商用GPS接收机和研制的基于嵌入式应用的GPS接收机精度大体相当。

Based on GPS RF front-end and base-band correlator, GPS receiver software was designed for embedded application. Dual mode carrier tracking loop was designed to suit high dynamic and other critical conditions. According to the locking status, these two modes can be switched back and forth. Static and dynamic tests were carried out to verify the designed embedded GPS receiver. Test results indicate that under static status the position accuracy is better than 5 m and velocity accuracy is better than 0. 1 m/s （both are standard deviation）. And under dynamic status, the accuracy of the designed GPS receiver is almost as same as that of commercial GPS receivers.