Dilution of precision availability standard

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Unformatted text preview: cision Availability Standard...................................................... 13 Table 3-3. SPS Service Availability Standard ............................................................................... 13 Table 3-4. Service Reliability Standard ......................................................................................... 14 Table 3-5. Constellation SPS SIS URE Standard ......................................................................... 14 Table 3-6. Positioning and Timing Accuracy Standard ................................................................. 15 Page i October 2001 GPS SPS Performance Standard Appendix A: GPS Documented Performance Characteristics ................... A-1 SECTION A-1 SECTION A-2 SECTION A-3 SECTION A-4 SECTION A-5 Introduction .......................................................................................................... A-1 GPS Operations Review...................................................................................... A-5 Service Availability Characteristics.................................................................... A-13 Service Reliability Characteristics ..................................................................... A-19 Accuracy Characteristics ................................................................................... A-25 Appendix B: Key Terms, Definitions, and Acronyms ................................. B-1 SECTION B-1 Key Terms and Definitions................................................................................... B-1 SECTION B-2 Acronyms ............................................................................................................. B-5 Page ii October 2001 GPS SPS Performance Standard SECTION 1 The GPS Standard Positioning Service The Global Positioning System (GPS) is a space-based radionavigation system managed and operated by the United States (U.S.) Government. GPS was designed as a dual-use system with the primary purpose of enhancing the effectiveness of U.S. and allied military forces. GPS provides a substantial military advantage and is now being integrated into virtually every facet of military operations. GPS is also becoming an integral component of the Global Information Infrastructure, with applications ranging from mapping and surveying to international air traffic management and global climate change research. In an effort to make this beneficial service available to the greatest number of users while ensuring that the national security interests of the United States are observed, two GPS services are provided. The Precise Positioning Service (PPS) is available primarily to the military and other authorized users of the United States and its allies equipped with PPS receivers. The Standard Positioning Service (SPS) was originally designed to provide civil users with a less accurate positioning capability than PPS through the use of a technique known as Selective Availability (SA). On May 1, 2000, the P...
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