Abstract
Structures of on-board autonomous navigation systems that spacecraft coordinates estimation by analysis of on-board camera data without receiving extra data from earth ground stations or other external sources are considered. Various approaches to correct the autonomous navigation system (ANS) of a spacecraft based on comparison of current images (CI) of the earth&s surface obtained on board, for example in optical wave band, and digital terrain maps (Reference Images, RI) stored in on-board computer memory are considered. Recommendations for increasing the efficiency of image processing (from the point of view of algorithm speed) are suggested. Results concerning potential accuracy of such systems are cited.
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