Systems Engineering and Electronics ›› 2022, Vol. 44 ›› Issue (9): 2914-2921.doi: 10.12305/j.issn.1001-506X.2022.09.26

• Guidance, Navigation and Control • Previous Articles     Next Articles

Multiple-roots problem of initial orbit determination of near-Earth object and space target

Kexin ZHAO1,2,3, Qingbo GAN1,2,3,*, Zhitao YANG1,2,3, Jing LIU1,2,3   

  1. 1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
    2. Space Debris Observation and Data Application Center, China National Space Administration, Beijing 100012, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2021-08-27 Online:2022-09-01 Published:2022-09-09
  • Contact: Qingbo GAN

Abstract:

Aiming at the problem that multiple roots cannot be distinguished when solving 8th-degree polynomial equations of Laplace or Gauss form in the process of initial orbit determination (IOD) of near-Earth objects and space objects using optical measurements, this paper proposes an effective distinguishing method. By constructing Laplace form 8th-degree polynomial equation, the relationship between the coefficients of the equation and the number of roots is analyzed. The equation is normalized by using the distance between the observation platform and the geocentric to eliminate the trivial solution and analyze the relationship between the number of non-pseudo solutions and geometrical configuration. Starting from solving the semi-latus rectum, the constraint relationship that the slant range should be satisfied in IOD is derived, using the general equation proposed by Shefer. The analytic form of the equations which should be satisfied between the observation time intervals and the changes of slant range is obtained and the distinguishing method of multi non-pseudo solutions using the equations is given. Finally, the IOD of near-Earth objects and space objects is verified by simulation measurements. The results show that this method can quickly and effectively select the correct root, and solve the problem of multi non-pseudo solutions that cannot be selected.

Key words: initial orbit determination, near-earth object, space target, space-based space target surveillance, 8th-degree polynomial equation

CLC Number: 

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