北斗卫星导航系统用户终端时延标定方法

摘要

T he accuracy of time delay calibration for the user terminal of the BeiDou nav‐igation satellite system has a great impact on the timing accuracy of the user terminal .So the time delay calibration must be carried out before timing accuracy test .In this paper ,two kinds of time delay calibration schemes for satellite navigation users with absolute delay and relative delay are studied .For the BeiDou user terminal without one pulse per‐second(1PPS) input interface ,two absolute time delay calibration methods are proposed .Experimental re‐sults show that the error of these two calibration methods is better than 2 ns ,which meets the requirements of the 5 ns index for the time delay calibration of the BeiDou user terminal .%北斗卫星导航系统用户终端时延标定准确与否直接关系到用户终端的定时精度，因此用户终端在出厂前和进行定时精度测试时必须进行整机时延标定。本文研究分析了绝对时延和相对时延两种卫星导航用户终端时延标定方案，针对无秒脉冲输入（1 PPS ）接口的北斗用户终端，提出了整机标定和分段标定两种绝对时延标定方法。实验结果表明：这两种标定方法的误差不确定度优于2 ns ，满足北斗定时用户终端时延标定5 ns指标的要求。