CHAPTER 12
Case Studies
12.1 Spare Supply System for Worldwide Telecommunication System Globalstar
The software tool Optimal Spare Allocator (OSA) has been designed at QUALCOMM (San Diego, California) by the International Group on Reliability (IGOR). The International Group on Reliability includes Igor Ushakov (the lead), Dr. Sergei Antonov, Dr. Mikhail Konovalov, Dr. Sergei Shibanov, Dr. Sergei Shorgin, and Dr. Igor Sokolov (all from the Russian Academy of Sciences). OSA has been developed for a spare supply system of the worldwide low orbit satellite telecommunication system Globalstar. The OSA computer model allows for solving direct and inverse problems of optimal redundancy for hierarchical structure of spare stocks. It has a user-friendly interface and a convenient reporting utility.
12.1.1 General Description of the Spare Support System
Satellite telecommunication system Globalstar has a number of ground base stations (gateways) dispersed all over the world. Successful operation of such a complex system depends on the ability to perform fast restoration of its operational ability after a failure. It can be reached by designing a maintenance system with hierarchical spare supply stocks of field replaceable units (FRU).
This supply system has a hierarchical structure with three levels: central spare stock (CSS), regional spare stocks (RSS), and on-site spare stocks (OSS) (see Fig. 12.1).
FIGURE 12.1 A hierarchical spare supply system.
Diversity of gateways and installing new ...
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