Software package for motion control algorithms design of service module in geostationary orbit

Aeronautical and Space-Rocket Engineering

Dynamics, ballistics, movement control of flying vehicles


Аuthors

Fedorov A. V.*, Hoang V. T.**

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: alexanderf@mail.ru
**e-mail: natuvtan@gmail.com

Abstract

At present, more and more attention is being paid to the idea of geostationary satellites servicing with automatic spacecraft. This idea realization requires creation of service spacecraft, high precision and stable algorithms for autonomous navigation and spacecraft motion control. To ensure accuracy while such algorithms developing, it is necessary to account for deterministic and random disturbances, caused by natural factors, errors in control system elements operation, as well as navigation errors. A software- mathematical complex, which allows performing a spacecraft motion simulation in both deterministic and stochastic statements, was developed for algorithms testing and effectiveness evaluation.

To perform the basic task, the software-mathematical complex should ensure compatibility with mathematical programming libraries, the ability of quick modification of the designed algorithm structure, and convenient intuitive user interface. For meeting the above said requirements, the complex is being designed and implemented employing object-oriented programming of both the software complex itself and control algorithms. The complex structure is modular, in which control algorithms’ module, module of the spacecraft onboard systems model and module of the external environment model were elaborated independently from the kernel. Such complex architecture allows studying various options

Such architecture of the complex allows exploring various options for the control block building. The current version implements algorithms for the service module control when bringing it to the vicinity of the target module working position and holding it relative to the target module for inspection.

The service module control algorithms in the software-mathematical complex were developed based on linearized models of motion of the service and target modules in the vicinity of a circular orbit with the specified radius. These models account for the disturbance from the Earth, Moon and Sun gravitational fields, as well as the error of direction and value of the thrust of the correction engine. Combined optimization method is used while the problem of optimal control solving. Control algorithm for the service module at the stage of its being held relative to the target module was developed using the model of relative motion with the assumption of the steady-state mode existence.

The software-mathematical complex operability is being confirmed by the simulation results of the service module motion control algorithms at various stages of its functioning in both classical and stochastic statements.

Keywords:

on-orbit servicing, automatic spacecraft, simulation, control algorithm, service module, software complex

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