基于多通道观测量精确定时的算法及实现  

Algorithm and implementation of precision timing based on various channels information

作　　者：周富相[1] 吴久银[1] 吕晶[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《解放军理工大学学报（自然科学版）》2007年第4期328-332,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

摘　　要：为了提高卫星导航系统中的定时精度,在研究利用伪距方程解算来获得钟差以进行接收机时间调整的传统定时方法的基础上,提出了利用多通道信息在最大似然准则下,进行最佳估计接收机时钟钟差的算法,并在时间调整过程中实现了闭环调整接收机秒脉冲(1 PPS)的输出。对算法及闭环调整方式在ARM+FPGA的硬件平台上进行了初步实现,对算法的性能进行了仿真。仿真结果表明,最大似然估计算法对进一步提高卫星导航系统中的定时精度有明显的改善。针对开环和闭环调整两种情况,也进行了仿真分析,得出闭环调整能够有效克服接收机时钟向同一方向漂移的问题。In order to improve the timing precision of satellite navigation, the traditional timing method based on the calculation of pseudo-range equations was studied. A new algorithm using ML role to evaluate the time-difference between the location receiver and the satellite with various channels information was put forward, and the output of local 1 PPS（1 pulse per second） was adjusted by the closed loop. The algorithm and the adjustment of the closed loop were implemented by the hardware construction ARM＋FPGA. Simultaneously, the performance of the algorithm was simulated, and the simulation results prove that this algorithm is better than the traditional timing method for improving the timing precision. To show t is also he difference between done, and the results the open loop and closed loop adjustment, the computer numerical simulation show that the performance of the closed loop is better than the open loop.

关 键 词：定时 多通道 最大似然准则 开环 闭环 调整 

分 类 号：TN967.1[电子电信—信号与信息处理]