State Simulation And Evaluation Of Micro-nano Satellite Data Processing And Transmission Subsystem

With low development cost,fast launch speed and high integration,micro-nano satellites are widely used in communication,remote sensing and electronic reconnaissance.The satellite data processing and transmission subsystem(data transmission subsystem),as an important part of the micro-nano satellite,undertakes the communication task of payload data recording and downlink.However,the small size of micro-nano satellites makes it difficult to redundantly backup the collected information,and the daily communication time is limited by the number of ground stations and the receiving coverage,and the time of single transmittable data is short.Therefore,in order to ensure the smooth completion of communication tasks during the satellite operation on-orbit,research on key technologies such as modeling simulation and effectiveness evaluation of satellite data transmission subsystem should be carried out.This study takes the micro-nano satellite data transmission subsystem as the research object,combines the satellite orbital motion with the data transmission subsystem performance simulation,and establishes the data transmission performance dynamic simulation model and method.For different evaluation indexes,it combines hierarchical analysis and fuzzy comprehensive evaluation method to scientifically and quantitatively deal with the complex multi-level evaluation problems of satellites.Based on this,a visualization system based on simulation model-driven micro-nano satellite data transmission state simulation and effectiveness assessment is developed.The main research work consists of the following three parts:1.Research on the modeling and dynamic simulation method of satellite data transmission subsystem based on numerical calculation.Firstly,the satellite on-orbit motion model is established,and the link connectivity is judged based on the basic characteristics of the satellite orbit and the geometric relationship of the satellite ground station position.On the basis of this,a series of simulation processes from data acquisition,processing,transmission,link transmission loss to data reception of the satellite are realized,and a more complete dynamic simulation model of satellite data transmission subsystem effectiveness is established,and the simulation results are analyzed and discussed by inputting simulation parameters.2.A method of evaluating the effectiveness of the data transmission subsystem based on the fuzzy hierarchical analysis is proposed.To address the problem that the function of satellite data transmission subsystem is complex and it is difficult to obtain the actual parameters for objective assessment,the weight vector of each index of the system is determined by hierarchical analysis based on the relationship between the structure and effectiveness of the data transmission subsystem.Based on fuzzy theory,combined with the fuzzy comprehensive evaluation method to evaluate the system effectiveness,which is conducive to the optimization of the design and development of the satellite data transmission subsystem.3.A model-driven visualization system for satellite data transmission state simulation and effectiveness evaluation is developed.In this study,we build a visualization system for satellite data transmission state simulation and effectiveness evaluation through Spring Boot framework and other related technologies.By designing products,tasks and projects,conducting system simulation,dynamically calculating satellite data transmission subsystem state information and completing effectiveness evaluation,and displaying simulation results in a visual way.The results of the simulation model and algorithm analysis established in this study can reasonably reflect the real-time changes of the performance indexes of the micro-nano satellite data transmission subsystem during the orbiting period,which is conducive to the construction of different levels of index systems to carry out the system effectiveness assessment and provide reference for the design strategy and working mode of the satellite data transmission subsystem.