Study Of Non-cooperative Target On-orbit Operating Technology Based On Multi-sensors Composite Measurement

Non-cooperative targets based on hostile spacecrafts as a representative haveno-cooperative identification, easy orbit changing ability and aggressive nature, it is thecritical link in future space attack-defense war.As a new field in space field, more andmore countries start to struggle for non-cooperative targets in space.So if studying it, measure is the foundation and orbit control is the core. Butbecause having low autonomy of space based measure, can’t depart from the GPS,measure information easily lose, systematic stability is bad, the research ofnon-cooperative targets encounter an bottleneck. In this situation, find a new measureand orbit control method for the study of no-cooperative targets have importantsignificance. Based on this background, the main content in this paper as follow:First, this paper has studied the flexible modeling for non-cooperative targets andorbit-operating.Based on the current analysis of non-cooperative targets’ concept, usingflexible modeling language to carry on flexible modeling for non-cooperative targets.Itcould efficiently put up with different meanings of nature language and also could putup productivity.According to rapid orbit determination, the cooperate section andnon-cooperate section of moving orbit of non-cooperative targets are clearly divided.And also having tried to scientific and accurate describe non-cooperative targets.Second, this paper has raised a new combination measurement mechanism which isindependent of GPS. Because GPS is easily controlled and disturbed in future space war,this paper raised that it can combine microwave radar, laser radar and CCD opticalinstrument to form a new method to measure hostile spacecrafts in the situation of notusing GPS. This method is a new thought for space relative measure.Third, in the situation that measure information lost, information fusion also hasbeen discussed. Be aimed at solving the problem of tracking non-cooperative targetsafter losing some information in the process of measuring. This paper offers a proposalabout information fusion algorithm of UKF filter wave based on combination sensorsmeasure and information fusion. The effective fusion of sensors can be guaranteed. Inthis way the measure information is inevitably effective.Forth, the way of rapid relative orbit determination is another field. For themeasure model is not accurate and the target easily motor-driven and avoid, UKFalgorithm is lead into the relative orbit determination of non-cooperative targets. Thismeans that in the situation of lacking measure information, the relative orbit filter isdevised to get superior degree of accuracy of relative orbit estimated valueAt last, adaptive control that suits multiple modes is the last problem. Orbit controlhas many tasks, as some kinds of maneuver mode including rendezvous and docking,hit-to-kill, etc. And it demand the system stability have higher instantaneity. This paper has studied the self-adaption control law based on the Lyapunov stability theory. BothRendezvous and Docking and Intercept blow suits self-adaption control law. It also hasperfect applicability to moving property of non-cooperative targets. Under thiscircumstance the problem of defense in space attack-defense model is solved.In short, non-cooperative targets is a hot point of current space attack anddefend,more and more countries and organizations are paying attention tonon-cooperative targets, which is the core technology that China must master. The studyabout non-cooperative targets in this paper will contribute to accurately inscribe thenon-cooperative targets and revise the mode of non-cooperative targets. It will provide anew theoretical thought for the technology research and improvement in this field.