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原文传递 An Evaluation of Various Space Clocks for GPS IIF

题名：	An Evaluation of Various Space Clocks for GPS IIF
作者：	Nuth, V;Feess, W A;Wu, C;
关键词：	GLOBAL POSITIONING SYSTEM, ZGLOBAL POSITIONING SYSTEMZ, CLOCKS, ZCLOCKSZ, TRACKING STATIONS, ZTRACKING STATIONSZ, ARTIFICIAL SATELLITES, ZARTIFICIAL SATELLITESZ, RUBIDIUM, ZRUBIDIUMZ, SPECIFICATIONS, ZSPECIFICATIONSZ, SIMULATION, ZSIMULATIONZ, CESIUM, ZCE
摘要：	This study projects the accuracy of GPS in the Accuracy Improvement Initiative (AII) environment given current satellite clocks and the future Block IIF cesium and rubidium clocks. AII is an upgrade to the GPS control segment that incorporates additional tracking stations and replaces the current partitioned filter with a fully correlated one. Real data, obtained during two weeks of October 1998, were modified when appropriate for simulated clocks. A simulation of the AII estimator is exercised on these data and its states used to predict user navigation messages, which are then compared to a truth reference. It is concluded that the IIF satellites, using either their cesium or rubidium clocks, would meet the AII accuracy specification assuming one upload per satellite per 6 hours, but that the Block IIA satellites with their cesium clocks would not. An upload rate of once per day is possible only with the IIF Rb clock. Suggestions are made for improving estimator performance.
总页数：	8
报告类型：	科技报告