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GPS , , . GPS , GPS .
4 ( , GPS ).
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GPS PPS (Precise Positioning
Service) SPS (Standard Positioning Service).
PPS P- , SPS -
C/A- .
GPS - 100 ( SA),
- 30 ,
P-.
- .
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GPS-
:
- , C/A-;
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C/A-;
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P-. P-
.
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9, 12- ,
- ( All in View). 24-
, .
GPS.
50 - .
Trimble (), Ashtech (), Leica (), Zeiss
(ͳ), Geotronics ().
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. , Ashtech 24-
GG-24, 12 GPS . Գ Spectra
Precision Geotracer GPS+GLONASS
Ashtech.