In this way, based on the engineering experience of the recoverable satellite, combined with the requirements of the spacecraft itself and the reality of each subsystem, Yang Hong started the overall scheme design of the shipborne information system. At that time, each subsystem of the spacecraft needed about 120 computer CPUs, and the selection, interfaces and standards of each computer were various. It is completely implemented in this state, and the performance of the whole ship is difficult to guarantee. In view of the present situation of large number, wide distribution, complex technology and scattered functions of spacecraft systems, Yang Hong put forward the structural scheme of ship-borne computer distributed system and the design idea of constructing spacecraft information system. According to the actual situation of domestic aerospace computer engineering, he demonstrated the selection of software and hardware of shipborne computers, and standardized the model, software programming, development and testing of shipborne computers, thus enabling the spacecraft to have a systematic optimized shipborne information system and information expressway. Compared with similar schemes in the world, shenzhou spaceship's information system scheme is obviously advanced. From 1999 to 2003, the success of five large-scale flight tests and manned space flights in shenzhou spaceship is the best proof of the correctness and rationality of the ship-borne information system scheme designed by Yang Hong.
Yang Hong can't forget that when he participated in the comprehensive test of the first new recoverable satellite launch, Academician Wang Xiji, the chief designer of the satellite and winner of the "two bombs and one satellite" meritorious medal, sat behind him, instructed him to test the resistance of initiating explosive device, demonstrated his every move, and repeatedly told him not to make any mistakes. He will always remember the old scientist's teachings, and his words and deeds will benefit him for life.
Just after the desktop joint test, before Yang Hong could catch his breath, he devoted himself to the development of the prototype of the electric boat. This is the first time that the spacecraft team has combined electronic equipment with structural and institutional subsystems into a complete spacecraft. From the second half of 1997 to the end of 1998, as the overall technical director of the electric ship, Yang Hong coordinated and straightened out the relationship between the overall electronic equipment, components and structures of the spacecraft, making the electric ship compatible with the structures and mechanisms for the first time. 1998165438+10. In October, Yang Hong and his colleagues successfully conducted the EMC test of the whole ship for the first time, and checked the electromagnetic compatibility between the ship itself and the ship system, as well as with other systems such as the carrier and launch site. In this experiment, the spacecraft team obtained the electromagnetic compatibility data of the spacecraft for the first time, which laid a solid foundation for promoting the development of the spacecraft prototype.
In order to ensure the quality of spacecraft software development, after the spacecraft entered the initial prototype development stage, Yang Hong deeply studied the international space software design standards and experience, and combined with the current situation and existing problems of space software development in China, put forward the idea of approaching the international space software design standards and adopting international general software engineering design. According to the characteristics of embedded computers, he formulated the implementation requirements of software engineering, adopted hierarchical management for spacecraft software, required all software designs to be standardized, transparent and structured, and required unit testing and third-party evaluation for key software. During the implementation of spacecraft software engineering, Yang Hong went deep into the front-line investigation and study of software design, organized technical exchanges, and constantly found and solved problems in implementation. Aiming at the problem that the test coverage of individual software can't meet the index requirements, Yang Hong and his colleagues searched for the reasons, carefully analyzed the software function, structure and test methods, and adopted software structure adjustment, test tools or other test methods to solve the problem according to different software characteristics. With the joint efforts of him and all his colleagues, the level and quality of spacecraft software development in the prototype development stage have made a qualitative leap, with unit test coverage and functional coverage reaching 100%, and passed the third-party evaluation by authoritative departments.
Yang Hong also undertook the design of spacecraft simulator for astronaut training. In order to ensure the sufficiency of astronaut training, it is necessary to establish a spacecraft simulator on the ground, which should have a real cockpit and man-machine interface, and simulate the data and command response of the spacecraft in real time by mathematical simulation, which can not only simulate the normal working mode of the spacecraft, but also simulate the faults and countermeasures. If it is developed by conventional simulation means, not only a large number of complex mathematical models need to be established, but also the problem of real-time dynamic coupling model modeling can not be solved. As the technical director of the astronaut training simulator, Yang Hong broke away from convention and designed the architecture of the spacecraft simulation system himself. His innovative design point is to build a spacecraft simulation system by combining mathematical modeling with data equivalence, which overcomes the difficulty of dynamic simulation of complex systems in one fell swoop and successfully realizes dynamic simulation. After expert evaluation and astronaut training, the human-computer interface and data simulation of the simulator are completely consistent with those of the real spacecraft.