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- W781447271 abstract "Abstract While navigation systems for the determination of the orbit of the Global Position System (GPS) have proven to be very effective, the current issues involve lowering the error in the GPS satellite ephemerides below their current level. In this document, the results of an orbit determination covariance assessment are provided. The analysis is intended to be the baseline orbit determination study comparing the benefits of adding laser ranging measurements from various numbers of ground stations. Results are shown for two starting longitude assumptions of the satellite location and for nine initial covariance cases for the GPS satellite state vector. 1. Introduction The task of the laser ranging analysis effort is to determine the added benefits derived from solving for a spacecraft’s state vector when utilizing laser ranging measurements in addition to the current use of pseudo-range and accumulated delta range (ADR), also known as Integrated Doppler measurements. The methodology to perform this analysis is to perform a covariance study for the Global Positioning System (GPS) orbit. The first method will be to perform the orbit determination (OD) using pseudo-range and ADR measurements from the six Monitor Stations (MS) for the GPS satellite orbit through an Extended Kalman Filter (EKF) analysis. The second method will be to add laser ranging measurements from the six MS sites along with various amounts of additional sites. Measurements from both methods will be used to form estimates for the satellite’s state vector, which will be propagated until new measurements are available. Finally, comparisons will be made between the performance of the current system and the modified system." @default.
- W781447271 created "2016-06-24" @default.
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- W781447271 date "2013-07-23" @default.
- W781447271 modified "2023-09-26" @default.
- W781447271 title "Orbit Determination Analysis Utilizing Radiometric and Laser Ranging Measurements for GPS Orbit" @default.
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- W781447271 hasPublicationYear "2013" @default.
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