Accession Number : ADA189495

Title :   The Evaluation and Selection of a Fifth Ground Antenna Site for the Global Positioning System.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Donelson, Tery L

PDF Url : ADA189495

Report Date : 07 Dec 1987

Pagination or Media Count : 82

Abstract : The NAVSTAR Global Positioning System (GPS) is a space based radio navigation system being developed to provide accurate position, velocity and time any place on or near the earth, 24 hours of every day, and under all weather conditions. The GPS performance characteristics provide significant benefits in the areas of spacecraft navigation, satellite delivery, equipment positioning, resource mapping, payload deployment and retrieval, propellant economies, data processing, and mission planning (13:204). GPS is a passive radio system and is comprised of space, control, and user segments. The space segment consists of 18 navigational satellites in six orbital planes, plus three operational spares. The three in-orbit spares will be positioned in such a way as to provide optimum coverage of the continental United States. A satellite failure in one of the three planes containing a spare will result in the spare being moved to a position close to the failed satellite. A failure in one of the other planes will cause satellites in adjacent orbital planes to be moved within their planes to provide the best possible coverage until a new satellite can be launched(6:1).

Descriptors :   *ARTIFICIAL SATELLITES, *GLOBAL POSITIONING SYSTEM, *NAVIGATION, *PASSIVE SYSTEMS, *POSITION(LOCATION), ALL WEATHER, ANTENNAS, COMMUNICATION AND RADIO SYSTEMS, DATA PROCESSING, DELIVERY, DEPLOYMENT, FAILURE, GROUND LEVEL, MAPPING, MISSION PROFILES, OPTIMIZATION, ORBITS, PAYLOAD, RESOURCES, SITES, SPACECRAFT, UNITED STATES

Subject Categories : Navigation and Guidance
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE