The Apply Of The Data Stream Simulation In The Space Mission Analysis And Design

Space technology level is the reflection of the science and technology ability and colligation power of a country.The success of Shenzhou 5 manned spaceship is the landmark of space technology development of our country. Spacecraft has the characteristic of high cost and high risk, so the design of the spacecraft has request high precision,high dependability and high security.The computer simulation supply a efficacious approach for the project validate and performance analyse of the spacecraft.This paper first introduce the background, purpose and primary content, and then particular introduce the discrete event simulation environment OMNeT++. The emphases are built the spaceship application system model and the three-axis satellite attitude control system model based on the OMNeT++ simulator, and the data stream characteristic was simulated and analysed. The main content of this paper is as follows:(1) Built spaceship apply system topology frame, the capacity of the great memory,the download strategy of science data and the 1553B bus characteristic were simulatedand analysed.(2) Built the simulation platform of the attitude control system of the three-axis satellite, the attitude determination and control arithmetic were validated, and the affection of the control precision by the output delay of the star sensor and flywheel was simulated, at last the affection of the period size to the control precision was researched.(3) For the simulation of the complex network and data stream system, the interface of OMNeT++ and HLA/RTI combine simulation was researched, and the two method carry out the combined simulation on the Windows and Linux system.The research of this paper extend the application of OMNeT++ to the spacecraft design domain, and achieve the distributed simulation of OMNet++.