A study on GPS Selective Availability(SA) and its countermeasures GPS选择可用性及其对策研究
While giving the experimental results, discussions have been made upon all the factors affecting the timing and calibrating accuracy ( e.g. selective availability ). 在给出实验结果的同时,对影响GPS定时精度的各种因素(包括SA影响)进行了讨论;
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. 标准定位服务(SPS)的固有误差、SA措施和市区环境的共同影响,使得GPS的导航精度难于满足特种车辆监管系统的需求。
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. 根据青藏高原GPS实测数据,讨论了SA和AS技术对GPS精密大地测量的影响。
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. 从GPS的误差来源出发,分析了GPS定位精度的影响因素。结果表明,选择可用性(SA)是影响GPS定位精度的主要因素。