The methodology of estimating the coefficient of conservation of the effectiveness of navigation systems and aircraft orientation in the conditions of its flight operation

Аuthors

Golyakov A. D.

Mlitary spaсe Aсademy named after A.F. Mozhaisky, St. Petersburg, Russia

e-mail: algoll949@mail.ru

Abstract

The effectiveness of using a flight vehicle navigation and orientation system is determined by its ability to measure the linear and angular motion parameters with accuracy meeting or exceeding specified requirements. Failures of individual components in modern navigation and orientation systems typically lead to partial system failure, consequently reducing overall operational effectiveness. To assess the impact of a partial failure in a flight vehicle navigation and orientation system on its operational effectiveness, the efficiency retention coefficient is in use. This indicator’s distinguishing feature, relative to conventional reliability measures, lies in its capacity to quantify the impact of navigation and orientation system reliability upon overall functional efficiency.
This paper presents the results of applying a scientific and methodological approach to solving the problem of estimating the efficiency retention coefficient of a flight vehicle navigation and orientation system under actual flight conditions. A vector based indicator has been proposed as the performance metric for navigation and orientation systems. The components of this indicator are values inversely proportional to the root mean square deviation of estimation errors for the parameters being determined, which are obtained from statistical processing of measurement results of a specified volume over a given time period.
Implementation of the proposed methodology for determining the efficiency retention coefficient is exemplified by application to an autonomous navigation system onboard a spacecraft operating in a circular orbital trajectory.
The findings presented in this study can be applied for justifying reliability specifications of constituent elements in emerging navigation and orientation systems for advanced flight vehicles.

Keywords:

efficiency conservation factor, reliability of the navigation and orientation system, aircraft, partial failure, operational condition of the motion parameter measuring instrument, flight operation

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