DESCRIPTION OF THE ATTITUDE CONTROL, GUIDANCE AND NAVIGATION SPACE REPLACEABLE UNITS FOR AUTOMATED SPACE SERVICING OF SELECTED NASA MISSIONS

摘要

Attitude control, guidance and navigation performance requirements are examined for selected NASA space serviceable mission spacecraft. Control elements (sensors, momentum exchange devices and thrusters) are described which can be used to define space replaceable units (SRU's). A number of SRU's are developed and their reliability block diagrams presented. An assignment of the SRU's is made to define a set of feasible space service¬able spacecraft for the missions of interest.