Parameter Identification And Controller Design Of Spacecraft Rendevous Under Non-cooperative Target Case

Spacecraft rendezvous plays an increasingly important role in space projects, which is prerequisite for the successful implementation of many tasks, such as interception, maintenance, rescue, butt, large structural assembly and formation flying and so on. The lack of information because of non-cooperative targets widely existing leads to the orbit rendezvous model unknown, the paper studies under this background.Firstly, the development of rendezvous and docking in various countries and the growing of China’s manned space is introduced, research status of non-cooperative rendezvous is reviewed, and emphasize the importance to expand the research of non-cooperative rendezvous. Then the three levels of oriented control identification is stated. The development of identification methods is briefly introduced. Furthermore, the non-fragile robust control and ensured costs control problem is proposed.Secondly, the origin of the spacecraft orbit rendezvous model is introduced and the basic principles of identification is briefly described. And the importance of the reasonable input signal is remarked, such as M sequences and reversal M sequences,as well as how the original data can be processed. Then the sampling interval is selected so that the system can remain stable in the calculation. Furthermore, the identifiability of the data is discussed.Then, under the case of the existence of the spacecraft maneuver in the direction of the z-axis, the least squares algorithm, recursive least-squares algorithm and recurrence extended least squares algorithm are used to identify the z-axis independent model systems, the experimental results show that both the absolute error and relative error of recursive extended least squares algorithm are least.Furthermore, two algorithm of the discretization of continuous system are proposed, which are linear algorithm and generalized bilinear algorithm. Base on this, the MIMO recursive extended least squares algorithm is used to identify orbital rendezvous system under the con-cooperative target case, compared to subspace identification method, the relative error of parameters from previous identification is smaller.Finally, based on the identified result, the robust H∞ control and guaranteed cost control problem is considered. A multi-objective robust non-fragile controller design method considering parameter uncertainty, external disturbances and pole placement is proposed.