Global Positioning System - Geodetic Applications,
Abstract
The NAVSTAR Global Positioning System (GPS) is a joint service spacebased radio navigation network of the U.S. Department of Defense with the Air Force as the executive service. The system will be fully operational in the late 1980's GPS will provide accurate time and three dimensional position and velocity information to users anywhere in the world, including those in near-earth orbits. The (real-time) navigation position determinations will be based on satellite-to-user transit times of modulated microwave signals broadcast by the GPS satellites. For navigation, the capability for absolute positioning on the order of 200 m or better will be made available for general civil use. The highest accuracy three dimensional navigation capability, on the order of 16 m, will be made available to U.S. Government agencies and to qualified U.S. commercial users where proper security measures can be established Even higher accuracy relative geodetic positioning capability, on the order of 1 to 10 cm (depending on the baseline lengths), will be attainable by radio interferometric (differential phase) techniques which will be available for general civil use. Achieving these high geodetic accuracies requires continuous simultaneous observations for up to two or three hours at each survey site. Accurate relative (non real-time) navigation positions and velocities, using doppler and integrated doppler techniques, will also be feasible for general civil use.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1984
- Accession Number
- ADA144904
Entities
People
- D. H. Eckhardt
Organizations
- Air Force Research Laboratory