Application of Test and Simulation Integration Technology in Spacecraft Development
In the development of spacecraft, a large number of tests and simulations are needed on the object to be developed, and the objects include whole stars, components, and algorithms. Testing and simulation go through the entire process of spacecraft development to provide a comprehensive, systematic assessment of the design of the tested and simulated objects. Since the beginning of the development of spacecraft, China has started testing and simulation of spacecraft. It has been more than 50 years old. The testing and simulation technology of spacecraft and components have been widely used in various development stages. With the development of space technology, the complexity of spacecraft is getting higher and higher, the function is more and more, the orbital time is getting longer, the investment and risk of aerospace are getting higher and higher. Therefore, it is necessary to continuously improve the design level of the simulator. To meet the needs of space technology development.
The test and simulation spacecraft simulation in the development of spacecraft is divided into three types: mathematical simulation, semi-physical simulation and physical simulation. Mathematical simulation is to calculate the mathematical model of the simulated object by means of an electronic computer, and perform mathematical operations to verify whether the mathematical model and the measurement and control algorithm are correct. The semi-physical simulation combines the mathematical model with the physical model, and performs simulation operations with an electronic computer to verify whether the measurement and control algorithm and the physical design are correct. Physical simulation is to establish the physical model of the object being simulated, and to examine the correctness of the design from the physical object.
Different types of simulations are used in different stages of development of the spacecraft. In the initial stage of development, mathematical simulation is used to calculate the mathematical model and control algorithm of the developed object by computer. The research results will be used as the theoretical reference for the actual physical device development. In the development process, semi-physical simulation is used to make The simulator adds algorithms to verify the control algorithm and some circuits, interfaces, and signals. At the end of the development, the spacecraft prototype will be developed to perform a complete physical simulation to investigate whether the entire spacecraft design has problems.
Original emulator problem
The development of spacecraft in China has a history of 50 years. The simulation method adopted is very practical and effective, and has achieved brilliant results. At present, computer software and hardware technology is developing rapidly, and performance has been improved by several orders of magnitude compared with the original computing equipment. Therefore, the need to effectively improve the original simulator is in front of it. The problems of the original simulator are summarized as follows:
(1) The design structure of the simulator is not uniform, the hardware and software design vary widely, and the technical level is uneven. As a result, the simulator simulation effects are different, performance, security, and ease of use cannot be guaranteed; the design cycle is long and cannot be mature. The design is rarely inherited.
(2) Once the emulator is designed, it is not easy to modify. Since there is no unified architecture, the software and hardware are different, which leads to the later modification and maintenance becoming a problem. It is often necessary for a fixed person to adopt a specific method and debug the equipment to complete, which may delay the development of the spacecraft.
(3) The simulator and the test equipment do not have a comprehensive systemization scheme, and cannot constitute an organic whole. As a result, in the later test process, the simulator and the test equipment are mutually restricted, which limits the functions of the respective functions.
(4) In the later test, the simulator can't easily adjust the algorithm and parameters online according to the test results, which leads to the accuracy of the theoretical calculation can not be achieved by the simulated measurement and control algorithm and control parameters. It is precisely because of some minor deviations. , resulting in control errors and shortened life in the actual operation of the spacecraft.
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