Systems Engineering and Electronics ›› 2024, Vol. 46 ›› Issue (11): 3784-3791.doi: 10.12305/j.issn.1001-506X.2024.11.20

• Systems Engineering • Previous Articles     Next Articles

Minimum orbital intersection distance based space index

Enhui WU1,2,3,*, Jing LIU1,2,3, Xu YANG1,2,3   

  1. 1. National Astronomical Observatory, Chinese Academy of Sciences, Beijing 100101, China
    2. Space Debris Observation and Data Application Center, China National Space Administration, Beijing 100101, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2024-01-05 Online:2024-10-28 Published:2024-11-30
  • Contact: Enhui WU

Abstract:

The space index is a quantitative assessment index that describes the long-term impact of space debris on the space environment. This index allows for a comparative analysis of whether the in-orbit operation of a space object poses a significant threat to other objects or the overall environment. This paper analyzes and compares existing typical space indices and their modeling methods. Addressing the shortcomings in the calculation of average collision risk in previous models, a space index model based on the minimum orbital intersection distance (MOID), namely the MOID-based space index (MBSI). This index considers factors such as the mass and effective cross-sectional area of space debris and incorporates collision risk. The MBSI indices of different space objects in the low Earth orbit (LEO) are calculated and compared with the results of existing RN and CSI indices, providing a comprehensive analysis. The results show that the conformity between MBSI and RN and CSI indices exceeds 60%. Additionally, MBSI better reflects the danger level of space objects throughout their lifespan.

Key words: space debris, minimum orbital intersection distance (MOID), collision risk, space index

CLC Number: 

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