Research On Attitude Measurement And Combination Parameter Identification Of On-orbit Capture The Non-cooperative Target

In the aerospace field, On-Orbit Capture technology is increasingly concerned by domestic andinternational, On-Orbit Capture (OOC) technology refers to using a tracking spacecraft to arrestparticular space objectives. In recent years, with advances in aerospace technology, most countriesgradually transferred to concern the space non-cooperative target task. In this paper, the keymeasurement technologies of space non-cooperative target are mainly researched, including themeasurement of relative attitude information technology in close inspections process and thecombination of high-precision parameter recognition technology In order to propose the practical,high precision, good real-time performance and reliability measurement method for providing atheoretical basis of non-cooperative target spacecraft on-orbit capture technology.In this paper, it resarch on the algorithm which useing the visual measurement system measurethe position and attitude of target spacecraft relative to the track in the close inspections process ofnon-cooperative targets and proposes an alternately iterative estimation algorithm about postion andattitude based on vision and make the algorithm simulation use the coplanar feature points got byvision measurement. By comparing with the classical orthogonal iteration algorithm, the algorithmidentification accuracy in close and noise immunity are improved, and the convergence timesignificantly is shorter.For online identifying the moment of inertia of the spacecraft combination, this paper establishesthe spacecraft attitude dynamics model containing all the moment of inertia of the combination andthe extended kalman filter algorithm is designed. By using the gyro measured angular velocity datacan identify the combination of spacecraft moment of inertia fully, solve the problem of thecombination of spacecraft inertia identification and provide the precisely parameter information of thecontrolled object for the next step high precision combination control.In order to increase the moment of inertia parameter identification accuracy, shorten theidentification time and improve the real-time nature of the system, the two-step online identificationmethod which is a new method is designed in this paper. The method uses a special moment of inertiamatrix and organic integration of the extended kalman filter algorithm and least squares algorithm toidentify the moment of inertia and get more accurately result than the present method and can reducethe energy consumption in the identification process.The method has more good engineering practicality.Based on the completion of key technologies about the spacecraft attitude measurement andparameter identification method of the combination, this paper uses the STK software set thealgorithm simulation platform. In addition, for the control of the combination, it completes thecorresponding control law designing and the system performance verification. The result effectivelyvalidates the performance of the proposed algorithm. The platform provides a useful reference forsubsequent engineering applications.