| 摘要 |
Various embodiments of the present invention provide methods, systems, apparatus, and computer program products for providing integrated attitude determination and attitude control for slewing of a satellite. In one embodiment a method is provided. The method comprises after receiving a repointing request, selecting a guide star sample comprising one or more guide stars from a guide star catalog; determining current attitude information; selecting and retrieving at least one point spread function (PSF) image from a PSF library; estimating an expected position for at least one guide star, the at least one guide star being one of the guide stars of the guide star sample; acquiring at least one star tracker image; calculating a cross-correlation function (CCF) to determine shifts in position of the at least one guide star compared to the expected position; and determining updated current attitude information based at least in part on the determined shifts in position. |
| 主权项 |
1. A computer-implemented method for providing integrated attitude determination and attitude control for slewing of a satellite, said method comprising the steps of:
after receiving a repointing request, selecting, via one or more processors, a guide star sample comprising one or more guide stars from a guide star catalog, wherein each guide star selected for the guide star sample has a measured brightness brighter than a predetermined value; determining, via the one or more processors, current attitude information; selecting and retrieving, via the one or more processors, at least one point spread function (PSF) image from a PSF library, the selection based at least in part on the current attitude information; estimating, via the one or more processors and based at least in part upon the current attitude information, an expected position for at least one guide star, the at least one guide star being one of the guide stars of the guide star sample; acquiring, via one or more processors and at least one image capture device on the satellite, at least one star tracker image; calculating, via the one or more processors, a cross-correlation function (CCF) based on a sub-image of the selected and retrieved PSF image, the star tracker image, and the expected position for the at least one guide star, the calculation determining shifts in position of the at least one guide star compared to the expected position; and determining, via the one or more processors, updated current attitude information based at least in part on the determined shifts in position. |
