Roke Manor Research Limited

Keith Roland Stribley

Robert John Weedon

A time interval measurement system for the timing between events occurring at two spaced apart locations comprising at each location a dual frequency Global Positioning System (GPS) receiver having operatively associated with it a GPS antenna, wherein both the GPS receiver and the antenna are dual frequency (L , L ) and the former is capable of both Coarse Acquisition (C/A) Code and carrier phase measurements, an accurate frequency reference source giving local time, a data-logger for logging the GPS data, a Time Interval Counter (TIC) means is used to measure the time of a local event relative to the local time and further comprising a central processor system (CPS) and a communication system via which the logged GPS data and time interval data are received at the CPS from each location, the CPS being arranged to derive a time-offset figure, in accordance with a predetermined algorithm which is indicative of the difference between times as measured in dependence upon the frequency reference sources at the two locations.

Timing systems

A time offset measurement system for the timing of events at spaced apart locations comprising at each location, a dual frequency Global Positioning System (GPS) receiver having operatively associated with it a GPS antenna, wherein both the GPS receiver and the antenna are dual frequency (L , L ), and the former is capable of both Coarse Acquisition (C/A) Code and carrier phase measurements, a frequency reference source giving local time, a data-logger for logging GPS data, a Time Interval Counter (TIC) used to measure the time of a local event as defined by the frequency reference source relative to time as determined based on on GPS data and further comprising a central processor system (CPS), and a communication system via which the logged GPS data and time interval data, are received at the CPS from each location, the CPS being arranged to derive in accordance with a predetermined algorithm, for each pair of sites a primary time-offset figure based on a direct signal path between the sites, and a secondary time-offset figure based on at least one indirect signal path between the sites, wherein confidence that correct system operation is obtained is indicated based upon correspondence between the primary and secondary time-offset figures.

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West Byfleet, United Kingdom

Keith Roland Stribley