| As an important national information infrastructure, satellite navigation systems have a wide range of important applications in the defense, transportation, technological and social life in all fields. To be assured that the navigation constellation system meets the user real-time, accurate and reliable navigation needs, the satellite life assurance is particularly important. This work mainly includes the life design, analysis, verification, and evaluation of the satellite and critical Life-limiting Item (key components), also includes the analysis of space environment, satellite end of life management etc.In this paper, the main problems of the life modeling and life assessment for the current satellite system and its key component, such as the problem of the complex distribution of life indicators for the satellite design life identified; of being difficult to assess for the critical components life in the case of Small-scale or non-failure data; of uncertain length of design life etc, are studied as followed.(1) A prediction and evaluation method of battery products life is constructed, according to analysis for accelerated degradation data of the satellite battery with different depth of discharge and accelerated model.(2) Satellite operation will be affected by many unpredictable factors in the space environment, which cause complex structure of observed data, difficult to deal with. Among them, the changes of solar array power output of satellites mainly contain three structures. One is the periodic change of the solar array output power caused by satellite operation. Two is the efficiency attenuation caused by the performance degradation of solar array. Three is the efficiency attenuation caused by the component failure of the solar array.(3) We conducted life assessment and evaluation methods of research, by use of solar array output power data, which provide a basis for life assessment method research of the long-life applications of satellite solar arrays. Case study shows that our model is reasonable and the evaluation method has high universality and prediction accuracy.Gyro, flywheel, the momentum wheel, such as satellite oil lubrication products have the characteristics of Small-scale, and also have to meet the requirements of its high reliability and long life. It causes two questions of limited Small-scale and non-failure data, for the current life modeling and assessment. In this paper, life and reliability evaluation technology based on the performance degradation data are studied through the analysis of the gyro motor test data. In the respect of physics of failure analysis, performance degradation modeling and assessment method based on physics of failure is proposed, which provides a new way for the life prediction and assessment of satellite oil lubrication products.(4) The second phase of Beidou second generation project requires MEO satellite designed life of10years, GEO/IGSO satellite designed life of12years. How to assign the life design index of the satellite to each key component is a bisic life planning issues. We consider how to plan the quality of the parts (including the redundancy design) and power distribution with genetic algorithm for the key components, so as to satisfy the satellite long-life requirement and optimize components quality. From the perspective of economics, the problem of the optimization of satellite design life is also discussed. |
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