The Standard Positioning System is a service supplied from the net of satellites of system GPS.
The SPS is used for uses civil, while service PPS remains classified to the military use. The SPS concurs to construct simple and economic receivers much and works on one single frequency (L1).
Until 2000, it marks them has been intentionally degraded through Selective Availability, reducing the positioning precision to approximately 100 meters of error. With the abandonment in the 2000 of the Selective Avalaibility system meters of error for the PPS offer pretazioni similar to those of PPS (8-60 meters of error for SPS against 6-20).
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