時間：2011-08-27 23:38來源：藍天飛行翻譯 作者：航空 點擊：次
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Global Orbiting Navigation Satellite System The Global Orbiting Navigation System comprises a constellation of 21 satellites plus three spares. These satellites operate in a 11 hour and 15 minute orbit at an altitude of 19, 100 km and each satellite transmits on a unique frequency using the same pseudo noise code. The level of accuracy for GLONASS is similar to GPS operating in the C/A mode. The measuring of the GLONASS broadcast information to determine position and range, is similar to that for the GPS. However, the navigation information of GLONASS, is referenced to the SGC-85 geodetic reference system with time being referenced to UTC. Global Positioning System A space-based positioning, velocity and time system, developed and operated by the U.S. Department of Defense and composed of space, control and user segments. The space segment is composed of 21 satellites (plus three operational spares) in six orbital planes. The control segment consists of five monitor stations, three ground antennas and a master control station. The user segment consists of antennas and receiver-processors that provide positioning, velocity, and precise timing to the user. Global Simulation A means of reproducing a representation of real working conditions to enable trainees to acquire and practice skills, knowledge and attitudes; Might involve individual students or an individualised cell made up of several students. Global System for Mobile Communications Digital wireless telecommunication standard, used or planned for use in more than 60 countries. GNSS Accuracy GNSS Accuracy is the degree of conformance between the GNSS output of position and time, and the true position and time. See also Accuracy GNSS Continuity GNSS continuity is the probability that the GNSS will be available for the duration of a phase of operation, presuming that the GNSS was available at the beginning of that phase of operation. See also Continuity GNSS Fault Detection and Isolation GNSS Fault Detection and Isolation is the combination of internal and external integrity monitoring which will identify any source of error in GNSS navigation signals and negate the effect within the system. GNSS Integrity GNSS Integrity is the assurance that all functions of the system perform within GNSS operational performance limits. See also Integrity GNSS Integrity Channel A system that broadcasts civil GNSS integrity information to users in a designated area, based upon measurements made by a ground-based monitor or network of monitors. |
