本文介绍了在现有罗兰C基础上增加数字授时功能的基本原理和系统组成,对影响罗兰c授时精度的主要误差源进行了预计.通过罗兰发射台现场试验和用户外场测试,给出了发射台卫星共视比对误差和授时发播控制误差,以及外场用户自主和非自主授时偏差,并对实测授时精度进行了分析.“,”The basic principle and the composition of the additional digital timing function of the existing Loran-C system are introduced, and the influence of the main error source on Loran-C timing accuracy is also estimated. On the basis of the test for the transmit stations on site and outdoors, the satellite common view error, the time transmission control error as well as the timing deviation of receiver under self-position and non-self position mode are presented, and the timing accuracy of the test is also analyzed.