| Project/Area Number |
10450374
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Aerospace engineering
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
HANADA Toshiya Aeronautics & Astronautics, KYUSHU UNIVERSITY, Associate Pro., 大学院・工学研究院, 助教授 (30264089)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥11,400,000 (Direct Cost: ¥11,400,000)
Fiscal Year 2000: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1999: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1998: ¥6,100,000 (Direct Cost: ¥6,100,000)
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| Keywords | particle inpacts / space debris / orbit propagator / orbit genarator / fragmentation model |
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| Research Abstract |
As a product from this research activity, an orbital debris environment model for the geosynchronous region has been developed and named GEODEEM (GEOsynchronous space Debris Environment Evolution Model). In cooperation with NASA, the Johnson Space Center GEO_EVOLVE 1.0 model and the GEODEEM model have been compared. From this comparison, the following concluding remarks have been drawn.
It is reasonable to assume that explosions will continue to contribute to the GEO environment over the next century. The explosion rates, in both models, are approximately linear in terms of their contribution to the ambient GEO environment, though the actual production of debris by explosion is directly related to the number of objects in the GEO ring population. In all cases examined, the production rate (explosions) and orbital perturbations tend to spread debris over increasingly larger spatial volumes over the duration of the projection. Both collection orbit post-mission disposal options are subject to contamination by GEO ring debris. This result would argue for higher or lower storage orbits.
Collisions do not currently constitute a threat to the GEO environment under the assumptions and criteria employed by GEODEEM and GEO_EVOLVE 1.0. This conclusion is applicable to the environment over the course of the next century, and is consistent with previous analyses. In these cases, much longer time periods are required to produce collisions. Projection times of this order are beyond the current capabilities of GEODEEM and GEO_EVOLVE 1.0 due to computer hardware constraints ; however, activities designed to fully explore and elucidate upon the very long-term nature of the GEO environment are within the capabilities of the computer code itself and as such are recommended as future work.
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