This paper provides an algorithm to compute the availability of constellation of satellites. The computation of availability of a constellation of satellites is different from a system which has a main element and its corresponding redundant element/elements. This is basically because the constellation as a total system has many main elements and the constellation (with only the main elements) characteristics itself will help in providing redundancy to some users while it may not be present for other users. The degree of redundancy also varies among the users and with time. This will have a greater impact on its service availability. Also, the failure of a satellite need not affect all the users. The duration of the time for which a dip in availability is seen may vary in accordance with the replenishment strategy or the replenishment time adopted. These factors tend to make the mathematical modelling of the system more complex and impractical. Hence, even for a single constellation makes it volluminous since it consists of availability figures for various users, for different durations and for various combinations of the sharing philosophy, replenishment strategy, reliability of individual satellite, launch vehicles considered, etc. The algorithm validation is run on a sample basis and results are demonstrated.
Simulation Algorithm for Availability Computation of a Communication Satellite Constellation
1994
10 pages
Report
No indication
English
Unmanned Spacecraft , Spacecraft Trajectories & Flight Mechanics , Algorithms , Communication satellites , Computerized simulation , Orbital lifetime , Satellite constellations , Synchronous satellites , Mathematical models , Monte carlo method , Failure modes , Launch vehicles , Redundancy , Reliability , Replenishment , Telecommunication , Foreign technology
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