2025 , Volume 30, № 1, p.120-131

Appropriate measurement data and a qualitatively constructed model of radiation pressure are required for designing an effective model for the motion of the center of mass of an spacecraft. The construction of a matching radiation pressure model involves determining its parameters, taking into account the individual characteristics of the orbital motion of the navigation satellite. The main reasons for the error in modelling the trajectory of orbital motion are the effect of various noises on the center of mass of the device, arising from errors in the orientation of solar panels to the Sun, design features, and operation of on-board systems. The noise intensity may change over time due to various factors, such as solar surges, wear of system components, or deterioration of measuring equipment. The paper provides a comparative analysis of modifications specially adapted for the sigma-point filter, which allows recursive restoring for covariance matrices of system noise and measurements with an estimate of the state vector. Based on the maximum likelihood method, the accuracy of finding the parameters of the radiation pressure model using various adaptive modifications is estimated. The effectiveness of adaptive filtering algorithms in determining the parameters of the radiation pressure model and in solving the problem of determining the motion of the center of mass of a navigation spacecraft is shown. It was found that for devices located on the first and third orbital planes, the greatest accuracy of finding satellite coordinates is achieved using adaptive modification 3, whereas for spacecraft located on the second orbital plane — with adaptive modification No. 4. The percentage of increasing the accuracy of finding the coordinates of satellites located on the second orbital plane using adaptive filtering algorithms No. 3 and No. 4 turned out to be comparable. Thus, when constructing the trajectory of the center of mass of the spacecraft, taking into account the refinement of the solar radiation pressure model parameters based on the maximum likelihood method, it is recommended to use adaptive modification 3.