Показано применение прецедентов функционирования имитационной модели для анализа результатов испытаний бортовой аппаратуры космического аппарата. Прецеденты содержат различные сценарии передачи команд управления и соответствующие им варианты изменения параметров телеметрии бортовых систем космического аппарата. Сценарии описываются правилами базы знаний и моделируются процедурами логического вывода. Разработанные структуры данных и программное обеспечение позволяют выполнять имитационные эксперименты, сохранять результаты в базе прецедентов и сопоставлять их с результатами испытаний бортовых систем как в процессе выполнения испытательных процедур, так и ретроспективно. Применение результатов имитационного моделирования расширяет возможности испытательного программного обеспечения и способствует повышению качества конструкторских решений.
This article represents a method for intellectual analysis of the results of testing spacecraft onboard equipment on the bases of the precedents of the simulation model.
A simulation model is founded on a knowledge base describing different peculiar properties of the onboard equipment’s function, settings of the reception-transmission tract, scenarios of control commands’ transmission and corresponding changes of the parameters of onboard devices’ telemetry.
We have designed data structures and software that allows conducting simulation experiments, save them in the precedent base and compare the results of the simulation modelling with the results of the onboard system’s testing. This analysis is carried out both during tests and after they are finished.
In the first case, an onboard systems’ command is sent to the object of testing and to the simulation model. The model contains methods of logical inference that forms a conflict set of rules, choose and complete the applied actions simulating the functions of onboard equipment at reception and execution of the given commands. The results of modelling are represented in telemetry that is compared with the telemetry received from the objects of testing. A designer is given a list of parameters that were changed in the process of the logical inference and the telemetry parameters of the object of testing.
In the other case, the telemetry of the onboard system obtained from the test storage results is compared with the precedents of the simulation model from the data base. Precedents contain examples of execution of big variety of commands and sets of the rules of the knowledge base that were completed for their acquisition. If telemetry parameters coincide, software allows a step-by-step review of the tests thus making a comparison with the actions of the simulation model.
Comparison of the simulation model precedents with the results of testing allows revealing special features of the onboard equipment function that may remain unnoticed when other methods of analysis are utilized. Intellectual methods of logical output for analysis of tests extend the capabilities of test software and provide better quality of designer solutions.
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