Precise Positioning Service Performance Standard - GPS.gov

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February 2007 GPS PPS PS List of Appendixes Appendix A: PPS Signal-In-Space (SIS) Background Information Appendix B: PPS Position, Velocity, and Time (PVT) Performance Expectations Appendix C: Key Terms, Definitions, Abbreviations and Acronyms Note: A Table of Contents is contained within each respective Appendix. 1 st Edition Page iv
February 2007 GPS PPS PS SECTION 1.0 The GPS Precise Positioning Service The Navstar Global Positioning System (GPS) is a space-based radionavigation system owned and operated by the United States. GPS has provided positioning, navigation, and timing services to military and civilian users on a continuous worldwide basis since first launch in 1978. An unlimited number of users with a civil or military GPS receiver can determine accurate time and location, in any weather, day or night, anywhere in the world. The United States Air Force, as the Executive Agent for GPS, is responsible for the design, development, procurement, operation, sustainment, and modernization of the system. The Commander of United States Strategic Command (USSTRATCOM) exercises Combatant Command of GPS through the 14 th Air Force (14 AF). 14 AF has day-to-day operational responsibilities for GPS, while its subordinate units, 50 th Space Wing (50 SW) and the 2 nd Space Operations Squadron (2 SOPS) maintain the health and status of the operational constellation at facilities located at Schriever Air Force Base, Colorado. The system is acquired and maintained by the Global Positioning Systems Wing (GPSW) at Space and Missile Systems Center, Los Angeles Air Force Base, California. Relying on tracking and monitoring stations around the world, 2 SOPS crew members conduct 24- hour operations to monitor, control and ensure GPS performance and reliability meet or exceed the requirements of both military and civilian users. GPS has grown into a global utility whose multi-use services are integral to U.S. and global security, economic growth, transportation safety, and are an essential element of the worldwide economic infrastructure. In an effort to ensure beneficial services are available to the greatest number of users without degrading security interests, two GPS services are provided. The Precise Positioning Service (PPS) is available primarily to the military of the United States and its allies for users properly equipped with PPS receivers. The Standard Positioning Service (SPS), as initially described in the SPS Signal Specification, was originally designed to provide civil users with a less accurate positioning capability than PPS, through a technique known as Selective Availability (SA). In 2000, the U.S. Government recognized the increasing importance of the GPS to civil and commercial users and determined that global interests would be best served if deliberate degradation of accuracy for non-military signals was discontinued. The President announced that the practice of degrading the SPS via SA would be discontinued May 1, 2000. The SPS Signal Specification was rewritten to reflect this change in policy and became the SPS Performance Standard, 4 October 2001. This first edition of the PPS Performance Standard establishes new unclassified performance standards that reflect SA being set to zero. It serves as a companion document to the SPS Performance Standard, for U.S. and allied military users of GPS who use the military capabilities provided by this “dual use” (PPS or SPS) system. 1.1 Purpose This PPS Performance Standard (PPS PS) defines the levels of Signal In Space (SIS) performance to be provided by the DoD to the authorized PPS user community. It is established to provide a basis for certification of PPS receivers for use in aviation Instrument Flight Rules (IFR) and to establish a minimum performance level which the GPS constellation must sustain. As additional capabilities are realized on future GPS space, control and user segments, this standard will be updated. Its performance metrics and assumptions should therefore not be used as the sole basis 1 st Edition Page 1
Page 1 and 2: GLOBAL POSITIONING SYSTEM PRECISE P
Page 3 and 4: ASSISTANT SECRETARY OF DEFENSE 6000
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February 2007 GPS PPS PS Recognize
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February 2007 GPS PPS PS discontinu
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February 2007 GPS PPS PS Table A.4-
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February 2007 GPS PPS PS ensemble o
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February 2007 GPS PPS PS A.4.8 UTC(
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February 2007 GPS PPS PS SECTION A.
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February 2007 GPS PPS PS end user.
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February 2007 GPS PPS PS Figure A.5
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February 2007 GPS PPS PS SECTION A.
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February 2007 GPS PPS PS In the cas
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February 2007 GPS PPS PS upper boun
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February 2007 GPS PPS PS When it is
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February 2007 GPS PPS PS A.7.3 Base
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February 2007 GPS PPS PS GLOBAL POS
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February 2007 GPS PPS PS TABLE OF C
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February 2007 GPS PPS PS List of Fi
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February 2007 GPS PPS PS SECTION B.
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February 2007 GPS PPS PS B.1.2 Glob
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February 2007 GPS PPS PS often used
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February 2007 GPS PPS PS Percentage
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February 2007 GPS PPS PS and VDOP v
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February 2007 GPS PPS PS Notes: 1.
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February 2007 GPS PPS PS Weighted S
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February 2007 GPS PPS PS B.4.2 Real
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February 2007 GPS PPS PS Table B.4-
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February 2007 GPS PPS PS HUL HPL HU
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February 2007 GPS PPS PS R95 = UHNE
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February 2007 GPS PPS PS 2. The SEM
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February 2007 GPS PPS PS GLOBAL POS
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February 2007 GPS PPS PS TABLE OF C
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February 2007 GPS PPS PS SECTION C.
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February 2007 GPS PPS PS Satellite
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February 2007 GPS PPS PS SECTION C.
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February 2007 GPS PPS PS - F - FOC
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February 2007 GPS PPS PS - R - R R9
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