Precise universal time for vehicles

摘要: Method and apparatus for providing precise universal time coordination or synchronization each of a plurality N vehicles, numbered consecutively i=1, 2, . ., (N≧2) that move within selected geographic region communicate by radiowaves with one more base stations located adjacent to the region. Each vehicle is provided sequence Satellite Positioning System (SPS) signals, SPS timing signal transceiver/processor receives signals determines present location determination made. One broadcast station are received vehicle. A choice means on chooses both presently available most accurate. nonoverlapping slots determined includes substantially all times interval. An ith group these allocated number i, no two groups having in common. on-board clock provides back-up if unavailable; continually corrected time, available. The chosen i then used determine during which will transmit operating data, including position, stations. At any accurate range as low 2-7 milliseconds. may be Global System, Orbiting Navigational other satellite-based system information position and/or observation.