| EPSRC Reference: |
GR/R52350/01 |
| Title: |
Improving Force Models for the Real-Time Prediction of GNSS Satellite Positions |
| Principal Investigator: |
Cross, Professor PA |
| Other Investigators: |
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| Project Partners: |
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| Department: |
Geomatic Engineering |
| Organisation: |
UCL |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 October 2001 |
Ends: |
30 September 2004 |
Value (£): |
219,973
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| EPSRC Research Topic Classifications: |
| Non-linear Systems Mathematics |
Upper Atmos Process & Geospace |
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| EPSRC Industrial Sector Classifications: |
| Aerospace, Defence and Marine |
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Summary on Grant Application Form |
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The development, operation and applications of Global Navigation Satellite Systems (GNSS) all require the modelling and calculation of precise orbits for the constellation spacecraft so that their positions can be accurately predicted. The determination of the spacecraft trajectories about the Earth relies, in turn, upon force modelling, and the forces considered significant for GNSS include the following:0 Solar radiation pressure, that is, the force produced by the impact of electromagnetic radiation from the Sun striking the spacecraft.0 Albedo, the force due to electromagnetic radiation reflected from, and emitted by, the Earth, and0 thermal re-radiation, caused by anisotropic radiation of heat from the spacecraft.The understanding and modelling of these three related, non-conservative forces is currently a limiting factor in orbit determination for GNSS. The basic objective of this proposal is to build upon work carried out as part of a major international scientific experiment to provide a set of analytical techniques to solve completely the non-conservative force-modelling problem (where sufficient information about the spacecraft is available).The work is particularly timely with the current establishment of high accuracy real-time 'augmented' GNSSs such as EGNOS (in Europe) and WAAS (in the USA), and with the very high likelihood of EU/ESA launching its own GNSS within the next five years. The solution to the very difficult integrity problems posed in the design of all such systems relies increasingly heavily on modelling to predict spacecraft positions.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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