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Past Conference Papers:
Responsive Missions - Civil
| Paper Number RS2-2004-5001: Real-Time Mosaic - Rapid Response Hight Resolution Imaging from Space | |
| Alex da Silva Curiel (SSTL), Phillip Davies (SSTL), Stuart Eves (SSTL), Lee Broland (SSTL), Martin Sweeting (SSTL) | |
| View/Download:Presentation | Paper | |
| Abstract: An imaging constellation mission is proposed to provide near-continuous surveillance of regional activity. By introducing a multiple plane constellation of small Earth Observation satellites, it is possible to monitor selected parts of the entire globe several times during daylight. Using off-the-shelf microsatellites ensures the program is responsive in the deployment phase as well as in the operational phase. The paper describes the basic Disaster Monitoring Constellation programme as has been implemented, which already delivers daily imagery. It also describes the system trades of the regional imaging constellations, and outlines the scope of the performance that could be obtained from such a system. A cost model illustrates that the balance between launch and space segment costs must be reached by considering suitable replacement strategies, and that the system is highly sensitive to requirement creep. Finally, it is shown that the use of cost effective, small satellites leads to solutions previously thought to be out of reach of Earth Science and Government customers. | |
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| Paper Number RS5-2007-1003: Future Optical Surveillance Using Small Satellites | |
| Stuart Eves (Surrey Satellite Technology) | |
| View/Download:Presentation | Paper | |
| Abstract: The paper will describe the successes of the TopSat and Beijing-1 surveillance missions, and will indicate how the lessons-learned from these satellites will influence the design of the next generation of optical surveillance constellations. Specifically, the ability to collect data with multiple sensors at different resolutions over different areas allows the satellites to be used responsively in different modes, depending upon the nature of the crisis situation. The agility of small satellites allows them to use Ground Motion Compensation modes to collect data over a wider range of illumination conditions, and the paper will illustrate how this capability allows a broader range of orbits to be considered, (with consequent implications for revisit rates, and hence responsiveness). This agility can also be used to implement in-pass stereo and wide-swath imaging modes when required. With the launch of the RapidEye constellation now imminent, the paper will also describe how the design of the next generation of satellites will be specifically designed for launch as part of a constellation. | |
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| Paper Number RS5-2007-2005: Circular vs. Elliptical Orbits for Persistent Communications | |
| James R. Wertz (Microcosm) | |
| View/Download:Presentation | Paper | |
| Abstract: Responsive Communications missions typically require “persistent communications,” i.e., repeat coverage that lasts for an extended period or the entire day. LEO orbits cannot provide this coverage without a large number of satellites. The solution has traditionally been thought of as moderate altitude elliptical orbits, such as Magic or Cobra orbits. However, recent IR&D work by Microcosm suggests that this may be the wrong answer. This paper compares moderate altitude elliptical and circular orbits in terms of coverage, accessibility, flexibility, robustness, the environment, and impact on spacecraft design. The conclusion reached is that circular MEO orbits are a better choice than elliptical MEO orbits for supplementary or persistent communications. Broad rules for selecting the best orbit for specific communications applications are given. | |
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