Selective Availability

Views Updated: Dec 15, 2025

Abbreviation

Pronunciation

/səˈlɛktɪv əˌveɪləˈbɪlɪti/

A study on GPS Selective Availability(SA) and its countermeasures
While giving the experimental results, discussions have been made upon all the factors affecting the timing and calibrating accuracy ( e.g. selective availability ).
Affected by the connatural error of Standard Positioning Service ( SPS ), Selective Availability(SA), and urban districts surrounding, GPS positioning precision is difficult to satisfy the requirement of Special Vehicle Surveillance & Management System.
Based on the data of GPS surveying in Qinghai-Xizang plateau, the impact of Selective Availability(SA) and Anti-Spoofing on precise geodetic survey with GPS is discussed.
Based on the analysis of positioning reasons of GPS ( Navigation Satellite Timing and Ranging / Global Positioning System ), influencing factors of the positioning accuracy of GPS are evaluated and the result shows that selective availability ( SA ) is a major factor.

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