KEYWORDS: Design and modelling, Control software, Data acquisition, Operating systems, Data communications, Software development, Data conversion, Control systems, Computer architecture, Vehicle control
For different application scenarios, aerospace vehicle control systems may use different flight control hardware platforms, flight control strategies, and control functions, and the variability in adoption may lead to difficulties in the development and transplantation of software for general purpose. In this paper, we propose a new idea to adopt modular design to decompose the vehicle control software functions into sensor data unpacking, navigation calculation, attitude control calculation, data fusion, control output, hardware driver, thread scheduling and other modules, modular packaging design or each function, and hierarchical design for the overall architecture to achieve the minimum modification to meet the development needs of different application scenarios. The overall architecture is designed in a hierarchical way to meet the development needs of different applications with minimal modifications and good scalability.
KEYWORDS: Computer simulations, Data modeling, Control systems, Human-machine interfaces, Data communications, Software development, Mathematical modeling, Data fusion, Signal processing, Information operations
Aiming at the difficulty of verification and test caused by the complex structure and timing logic of multi-source data fusion flight control software algorithm, this paper puts forward the digital simulation technology of flight control software, which simulates the reference clock of flight control software, the external link equipment of flight control software, and the functions of sensor data, actuator data, data communication interface, hardware driver, thread scheduling and so on. The simulation software technology enables the self-development stage of flight control software to get rid of the constraints of hardware simulator debugging conditions, quickly and conveniently verify the correctness of the timing logic and algorithm implementation of flight control software, greatly shorten the cycle of software development and unit test, save the development cost and improve the efficiency and quality of flight control software development.
KEYWORDS: Computer architecture, Software development, Space operations, Data processing, Data communications, Operating systems, System integration, Real-time computing, Embedded systems
According to the main problems of spacecraft embedded software design, the universal real-time architecture of spacecraft embedded software without operating system is proposed, and the data flow, control flow, time-sequence design techniques and methods under this architecture are given. The architecture aims at layering and decoupling, and integrates object-oriented and process-oriented programming ideas with task description word as the starting point. The main technical features are : the task modules run independently according to their respective task description word information, and do not affect each other ; task module controlled by the state machine, step by step execution, efficient operation ; inter-layer communication using queues, messages, notifications and other ways, data flow fluent. Finally, an embedded software design example of the universal real-time architecture is given. Compared with the traditional software development model, it has significant improvements in reducing software complexity, improving development efficiency and saving costs.
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