首页|Relative orbit determination algorithm of space targets with passive observation
Relative orbit determination algorithm of space targets with passive observation
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Angles-only relative orbit determination for space non-cooperative targets based on passive sensor is subject to weakly observable problem of the relative state between two spacecraft.Previously,the evidence for angles-only observabi-lity was found by using cylindrical dynamics,however,the solu-tion of orbit determination is still not provided.This study deve-lops a relative orbit determination algorithm with the cylindrical dynamics based on differential evolution.Firstly,the relative motion dynamics and line-of-sight measurement model for near-circular orbit are established in cylindrical coordinate system.Secondly,the observability is qualitatively analyzed by using the dynamics and measurement model where the unobservable geometry is found.Then,the angles-only relative orbit determi-nation problem is modeled into an optimal searching frame and an improved differential evolution algorithm is introduced to solve the problem.Finally,the proposed algorithm is verified and tested by a set of numerical simulations in the context of high-Earth and low-Earth cases.The results show that initial relative orbit determination(IROD)solution with an appropriate accu-racy in a relative short span is achieved,which can be used to initialize the navigation filter.
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