Very high positioning accuracy, of the order of a few metres, and accompany it with two-way messaging, fleet dispatch information and emergency location; neither connection to nor dependence on any military system; no threat to national security, because the ground station which carries out the computations can be programmed to cut off service instantly to any transceiver that approaches a military reservation or travels at missile speed; no threat to national sovereignty because national borders will be precisely defined in ground station computers—this permits each country to control the level of service to be allowed within its territory; a system that can be established by one nation, or by a contiguous group of nations, at low cost; the linking of all modes of transportation, emergency services and fixed sites with a single system using low-cost transceivers; the ability to tie all elements together to form area-wide or even global systems, with as few as six satellites for world-wide coverage; the inclusion of polar coverage with a small number of additional satellites; operation with up to 12 different, competing RDSS systems providing service simultaneously to the same geographical area. SPREAD-SPECTRUM TECHNIQUES USED The outbound Geostar microwave transmission from the ground station comes to the users as a continuous "spread-spectrum” data stream, in the S-band at 2492
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