Computer Simulation and the Performance Capabilities of the NAVSTAR Space-Based Navigation System; SSD 81-0125
Downey, CA: Rockwell International Space Operations/Integration & Satellite Systems Division, 1981. Presumed First Edition, First printing. Wraps. [2], 11, [3] pages. Illustrations. Bibliography. Staplebound. Prepared for presentation at the 1981 Winter Simulation Conference, Peachtree Plaza, Atlanta, Georgia, 9-11 December 1981. Includes Abstract; Introduction; Navigation Procedures; The Major Segments of the GPS System; Range Error Components; Uniform Distribution of Observations in Time and Around the World; Bibliography; and Conclusions. The Navstar GPS will permit users to determine their positions in real time to an average accuracy of 50 feet anywhere on or near the surface of the earth. This is accomplished through radio navigation techniques in which precise binary pulse trains with chipping rates of 1 and 10 million bits per second are sent out by a constellation of 18 satellites in 12-hour orbits 10,898 nautical miles above the earth. The Navstar system, which is being financed jointly by the various branches of the military, will also be widely utilized by civilian users. Abstract: Six Navistar navigation satellites are presently traveling through space 10,898 nautical miles above the earth. By 1987, the operational constellation, which will consist of at least 18 larger and more advanced satellites, will be providing continuous navigation coverage to a world wild class of civilian and military users. the Navstar satellite constellation will yield routine accuracies nearly 20 times better than any other global navigation system. This paper explores some of the computer modeling methods used by the Navistar system itself and by researchers who have been simulation the military and civilian benefits to be derived from its use. More