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,,Rockwell International 1983 28 . ( 1958.) NAVSTAR. ,,BLOCK 1 . 10 1989. . ,,BLOCK 2A.

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4.2. (SPSStandard Positioning Service) NAVSTAR . SPS . (SA).

SPS : - 100m, -156 , - 340 ns. GPS 1994 . (Federal Radio navigation Plan). 95 % () , : () 5 PDOP , - 6. 95 % 2 dims (2 ). 95 % . , . (, RMS) (68 %) , . () , 50 % . (SEP) , 50 % . 2 dims, dims, RMS , - . (RMS) (). - , - .

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PPS 0,95 22 , 22,7 m 0,09 {is, SPS 100 , 140 0,34JIS .

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