Relative timing characteristics of GPS timing modules for time synchronization application

Abstract

This paper is focused on the measurement and evaluation of the relative timing characteristics of GPS (Global Positioning System) timing receivers for time synchronization application. I-Lotus M12M oncore timing modules optimized for the timing applications were utilized as tested timing modules. These modules represent the next generation of the low cost GPS timing receivers which expect accuracy of time synchronization to the so-called Universal Time Coordinated (UTC) in the nanoseconds. The previous generation of receivers was M12+ oncore. Measurement was realized with two M12M timing receivers to obtain their relative time error. The relative time differences between generated 1PPS (one pulse per second) output signals (between rising edges of the pulses) and also 100PPS signals were measured. Error from UTC time was not needed to know but only relative time error between generated 1PPS (100 PPS) signals by the receivers. From the viewpoint of these receiver's application for precise time synchronization measured date are presented and statistically evaluated. The aim of using such timing system is a precision signal marking in different known locations.