Space Camera Electronic Monitor Integrated System Based On General Purpose Serial Bus

Space camera electronic monitor integrated system (MIS) is a main part of the space camera ground testing system. It can monitor and analyze the running state of the space camera electronic system.Firstly, factors effect MIS project is analyzed, including developing requirement of camera, reliability of monitor device, performance of monitor software, and so on. Based on this analysis, requirement to build MIS, which is sufficient monitor and efficient analysis, and intelligent monitor as a development trend are discussed.Secondly, a new way that using Expert System (ES) to realize the MIS is proposed. The ES includes two main parts: one is knowledge representation, the other is reasoning strategy. Production rule combined with database is used to express the knowledge. In this way, a rule's condition and conclusion are stored as different fields in a record of database into the computer. Meanwhile, forward reasoning strategy, focusing on SQL sentence, is presented. This strategy, firstly, uses SQL sentence to query database for matching knowledge, then deletes facts that have been used after each reasoning end. With this method, repeated reasoning can be avoided and reasoning space can be reduced, and finally quick reasoning is realized.Thirdly, being pointed to a certain space camera, the MIS based on general purpose serial bus, including bus monitor and monitor software, is built. Bus monitor, as the interface between the MIS and space camera electronic system, can receive all communication data on the camera system bus and ensure sufficient monitor. With the idea of ES, knowledge arrangement graph about camera ready state and photography state are build. Based on the monitor data, the reasoning machine analyzes the state of camera subsystem. At last, quick analysis of the state and failure orientation are achieved.