Global Positioning System (GPS) satellite signals are used in time and frequency metrology in general and a GPS receiver can provide a reference signal for frequency and time synchronization in particular. GPS, well known as a versatile, global tool for positioning, has also become the primary system for distributing time and frequency. GPS delivers very precise time as a by-product of their navigation methodology and the exacting timing requirements for the satellite. For measurement applications, like recording the accurate time (time stamping) and positioning (extract distances and velocity speed) are useful information for a single device. Due to the time accuracy, GPS can be used for synchronization of multiple, distributed measurement systems. The article describes the measurements set up and the result of phase-match specifications between separate, stand-alone systems, which meet figures of current inter-channel phase-match specifications.
