Navstar
Related Sites

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University NAVSTAR Consortium (UNAVCO)
Outline: UNAVCO University NAVSTAR Consortium
Abstract: UNAVCO University NAVSTAR Consortium P.O. Box 3000, Boulder, Colorado 80307 40° 02´07´´ N

NAVSTAR Signal Specification
Outline: NAVSTAR Signal Specification This Page is Under Construction! Who should read this page Scope NAVSTAR Services Radio Frequency Signal Characteristics For More Information... References
Abstract: * Construction Notice * Disclaimer * Who should read this page * Scope * NAVSTAR Services *Standard Positioning Service *Precise Positioning Service * Radio Frequency Signal Characteristics *Frequency Plan *Correlation Loss *Carrier Phase Noise *Spurious Transmissions *Equipment Group Delay *Signal Polarization *C/A Code Generation & Timing *C/A C... This page is intended for people who are interested in the more technical aspects of the NAVSTAR GPS Signals. YOU DO NOT NEED TO READ THIS TO USE A GPS RECEIVER! This document details the characteristics and content of the NAVSTAR GPS transmissions as described in the "Global Positioning System Standard Positioning Service Signal Specification" document.

WELCOME TO THE NASA/GSFC ORBITAL DATA BULLETIN BOARD
The Goddard Space Flight Center (GSFC), Mission Operations and Systems Development Division (Code 510), Mission Operations Branch (Code 513), Operations Management Section (Code 513.1), Orbital Information Group (OIG) Bulletin Board System (BBS) provides access to satellite orbital Two Line Element (TLE) data, in addition to other satellite related orbital information. This data is compiled, stored, grouped, and made available in descrete files, downloadable from a user-friendly menu driven system. Data files are in standard TLE format or text files. The BBS User's Guide is also a downloadable file.

NAVSTAR Global Positioning System
Outline: NAVSTAR Global Positioning System GPS POLICY GPS SIGNAL CHARACTERISTICS SELECTIVE AVAILABILITY, ANTI-SPOOFING GPS SYSTEM SEGMENTS GPS SYSTEM TIME GPS TIME TRANSFER
Abstract: The following Global Positioning System (GPS) policy and system segment information are obtained from the 1992 Federal Radionavigation Plan (FRP) , prepared jointly by the Department of Defense (DoD) and the Department of Transportation (DoT) and other sources such as meetings and conferences. USNO GPS DATA FILES * GPS POLICY * GPS SIGNAL CHARACTERISTICS * SELECTIVE AVAILABILITY, ANTI-SPOOFING * GPS SYSTEM SEGMENTS * GPS SYSTEM TIME * GPS TIME TRANSFER The GPS is a DoD developed, worldwide, satellite-based radionavigation system that will be the DoD's primary radionavigation system well into the next century. The constellation will consist of 24 operational satellites. GPS Full Operational Capability.

Navstar GPS Fact Sheet
Outline: Navstar Global Positioning System
Abstract: Navstar Global Positioning System The Navstar Global Positioning System (GPS) is a constellation of orbiting satellites that provides navigation data to military and civilian users all over the world. The system is operated and controlled by members of the 50th Space Wing located at Falcon Air Force Base, Colo. GPS provides 24-hour navigation services which include: Extremely accurate three-dimensional location information (latitude, longitude and altitude), velocity and precise time. A worldwide common grid that is easily converted to any local grid. Passive all-weather operations. Continuous real-time information.

Latest Notice Advisories to Navstar Users
Abstract: ---231--- NOTICE ADVISORY TO NAVSTAR USERS (NANU)231-95304 1. CONDITION: PRN 12 (SVN 10) WAS UNUSABLE ON DAY 304 (31 OCT 95) BEGINNING 1700 ZULU UNTIL DAY 304 (31 OCT 95) AT 1714 ZULU. 2. POC: 1LT HILGENBERG AT COMMERCIAL (719) 567-6378 OR DSN 560-6378. ---232--- NOTICE ADVISORY TO NAVSTAR USERS (NANU) 232-95307 1. CONDITION: GPS SATELLITE PRN12 (SVN10) WILL BE UNUSABLE ON JDAY 322 (18 NOV 95) BEGINNING 0000 ZULU UNTIL FURTHER NOTICE. 2. POC: NAVIGATION ANALYST AT COMMERCIAL (719) 567-6378 OR DSN 560-6378. ---233--- NOTICE ADVISORY TO NAVSTAR USERS (NANU) 233-95308 1. CONDITION: GPS SATELLITE PRN09 (SVN39) WAS UNUSABLE ON JDAY 308 (04 NOV 95) BEGINNING 0500 ZULU UNTIL FURTHER NOTICE. 2. POC:

Global Positioning System
Outline: Global Positioning System Introduction to the Global Positioning System (5K) GPS Facts and Figures Latest GPS Status Message Latest Notice Advisory to Navstar Users Archive of Notice Advisory to Navstar
Abstract: return to NAVCEN homepage Last Revised: 31 January 1996