DIAGNOSTIC EXPERT-SYSTEM FOR SCIENTIFIC SATELLITE

We have successfully developed a diagnostic expert system for scientif ic satellites, and applied it to the geomagnetic tail observation sate llite named GEOTAIL, which was launched in July 1992. In recent years satellite operators are required to have an increasingly wide variety of experts' knowledge both on the spacecraft and on the ground trackin g systems in order to check the satellite's conditions exactly. The GE OTAIL operation will extend over a long period of time, so it is not p ractical to post such high level operators in the control room all the time because of economic problems and limited personnel resources. Th is diagnostic expert system enables an operator who doesn't have speci al knowledge to diagnose the whole status of the satellite easily and with a high level of expertise. Most of the necessary information for trouble diagnosis is automatically set using an on-line data feed syst em.