Interrelation of Navigation and Timing

Abstract

Modern electronic navigation systems often require, and have provision for, internal system synchronization to microsecond or submicrosecond accuracy. Examples include Omega, Loran-C, and Transit (NNSS). These systems have global or near-global coverage and are thus among the most extensive and accurately-controlled time dissemination systems in the world. However, while all maintain precise relative time, some systems are well controlled to UT while others are not. This not only compromises the utility of some navigation systems for the dissemination of standard time but also limits potential synergy from the use of several systems simultaneously for navigation.