GNSS信号模拟器通道群时延标定方法

发布时间：2018-05-30 06:42

本文选题：全球导航卫星系统(GNSS)信号模拟器 + 群时延　；参考：《北京航空航天大学学报》2015年12期

【摘要】：传统的全球导航卫星系统(GNSS)信号模拟器通道群时延标定方法有相位翻转点法和相关峰法两种,两者均在零伪距或固定伪距的特殊仿真场景下进行测量,且在通道传输特性非理想的情况下测得的群时延均存在偏差.提出了基于闭环伪距测量的模拟器通道群时延标定方法,并设计实现了GNSS信号模拟器通道群时延标定系统.首先,采用高速直接射频采样存储系统对模拟器正常星座动态仿真场景下输出的导航信号和秒脉冲(1 PPS)信号同时进行记录.其次,使用软件接收机对信号进行捕获跟踪,利用三次样条插值判定1 PPS上升沿位置作为伪距观测历元时刻,对软件接收机的伪距观测量和模拟器仿真的伪距记录值做数据比对,得到模拟器的群时延标定值.最后,分别利用上述方法对两种商用模拟器的群时延进行了标定,实验结果表明,闭环伪距测量法有效可行,测量不确定度优于0.7 ns.
[Abstract]:The traditional channel group delay calibration methods of GNSS signal simulator include phase flip point method and correlation peak method, both of which are measured in the special simulation scene of zero pseudo-range or fixed pseudo-range. And when the channel transmission characteristics are not ideal, the group delay can be measured with deviation. A calibration method for channel group delay of simulator based on closed loop pseudo-range measurement is proposed, and the channel group delay calibration system of GNSS signal simulator is designed and implemented. Firstly, a high-speed direct radio frequency sampling storage system is used to record both the navigation signal and the second pulse 1 PPS signal in the dynamic simulation scene of the simulator's normal constellation. Secondly, the software receiver is used to capture and track the signal, and the cubic spline interpolation is used to determine the position of the rise edge of 1 PPS as the pseudo-range to observe the epoch time. The pseudo-range observations of the software receiver are compared with the pseudo-range recorded values of the simulator simulation, and the group delay calibration values of the simulator are obtained. Finally, the group delay of the two commercial simulators is calibrated using the above methods. The experimental results show that the closed-loop pseudo-range measurement method is effective and feasible, and the uncertainty of measurement is better than 0.7 ns.
【作者单位】：中国航天科工集团第二研究院计量与校准技术国防科技重点实验室;北京航空航天大学电子信息工程学院;
【基金】：国家自然科学基金(61271197)
【分类号】：TN967.1

【共引文献】