The “strongest brains” of “Shenzhou”, “Tianzhou” and “Tiangong” were created by them

They are a strong force in the field of guidance, navigation and control of Chinese spacecraft, with the goal of “accurate control, precise guidance and stable control”, and the ideal of “pursuing the dream of the universe, controlling and writing ship wonders”. < / P > < p > they have endowed Chinese manned spacecraft with “the most powerful brain”, enabling these spacecraft to carry astronauts to and from heaven and Earth accurately, realizing the “flying dream” of the Chinese nation for thousands of years, and realizing the “dream of walking in heaven” and “dream of staying in heaven”. < p > < p > with a long-term view, they have arranged the GNC general technology of the follow-up spacecraft in advance, and helped the test ship of China’s new generation manned spacecraft to achieve the first flight, especially the excellent performance of “10.8 ring” precision landing, laying a solid foundation for future development. < / P > < p > they took the lead in putting forward the concept of “wild goose array” team in the aerospace system, fully mobilized the combat effectiveness of each member and formed a strong joint force. Now, it has been comprehensively promoted within the scope of China Aerospace Science and Technology Group Co., Ltd., so that more teams can take off. < / P > < p > in space missions, it’s very different if you don’t board people. Due to the particularity of manned space mission, every step of spacecraft from orbit to return must be more accurate, and GNC system, the “brain” of spacecraft, is the most important thing to achieve this requirement. In April 1994, the 502 Institute of the Fifth Academy of Aerospace Science and Technology Group established the spacecraft GNC engineering group. The elite troops in the field of GNC of Chinese spacecraft will gather in this “dream boat” team and officially set sail. In the team, there are predecessors who have experienced the research and development tasks of recoverable satellites, and there are also young talents who have just graduated. In the case of extremely limited reference materials and development conditions, team members design, calculate and test day and night. When they are busiest, they eat and live in the unit and race against the tight task cycle. The conditions are simple, but they have very high requirements for technical level and quality control. They directly benchmarked the GNC system of similar foreign spaceships, and tried to apply some technologies not used by foreign spaceships, so as to further improve the safety of astronauts’ return, search and rescue. On November 20, 1999, shenzhou-1 spacecraft flew into space on schedule by long march 2F carrier rocket, and landed accurately in the scheduled area the next day. The first mission of China’s manned space project was successfully completed. As one of the most complex, critical and most difficult subsystems in the manned spacecraft system and even the whole manned space project, the GNC system of spacecraft has passed the test of flight practice, and the team has obtained the first class national collective work. Then, the team carried out the shenzhou-2-shenzhou-4 spaceship missions without stopping. With the least number of tests, the team comprehensively examined the GNC system, and joined other subsystems to meet the long-awaited historical moment. On October 15, 2003, the Shenzhou-5 spacecraft carried astronaut Yang Liwei into space, and landed in the scheduled area on October 16. Since then, China has become the third country in the world to carry out manned space activities independently, and the Chinese nation’s dream of flying into the sky for thousands of years has come true. After that, Shenzhou-6 mission realized multi person and multi-day flight, and Shenzhou-7 mission carried out China’s first astronaut space extravehicular activity. < / P > < p > while the first phase of the manned space engineering mission was successful, the team was also busy for the second phase of the mission. Rendezvous and docking of manned spacecraft, cargo spacecraft and space target aircraft / space laboratory is the core technology that must be broken through in the second phase of the mission, and also the key technology for the subsequent construction and operation of space station. < / P > < p > in the space rendezvous and docking mission, two spacecrafts with complex shape and several tons of weight should be combined in the space of hundreds of kilometers, and the precision requirements of GNC system can be imagined. “We have adopted high-precision attitude determination means and attitude control actuator with large control torque capability, thus solving the problem of high-precision and high stability attitude control and rapid attitude maneuver coordination, so that Tiangong-1 / tiangong-2 with large mass and inertia can move fast and stably.” Team member Jiang jinzhe said that in Tiangong-1 space target aircraft, the proportion of new GNC subsystem products accounted for nearly 80% of the total. < / P > < p > at the same time, the team innovated boldly in ground test, successfully developed and applied new ground test equipment, adopted a series of new test schemes, and creatively simulated the relative motion of two spacecrafts in space with aircraft, so as to verify the measurement performance of the measurement sensor. “We have also designed a human controlled rendezvous and docking verification system based on the first phase of the manned simulation cockpit, which is equivalent to opening a” space driving school “for astronauts on the ground to help them master the rendezvous and docking technology in advance < p > < p > from 2011 to 2012, Tiangong-1, Shenzhou-8 and shenzhou-9 spacecraft were launched into orbit, and China’s first unmanned automatic, manned automatic and manual rendezvous and docking were carried out precisely; Shenzhou 10 launched in 2013 also added “round flying” action; tiangong-2 space laboratory and shenzhou-10 launched from 2016 to 2017 were launched Spaceship No.1 and tianzhou-1 cargo spaceship have verified the key technologies of astronauts’ medium-term residence and propellant on orbit replenishment. So far, the technologies that need to be verified in advance in the construction of China’s space station have passed the assessment, and China’s manned space project has entered the stage of space station construction. < p > < p > on May 5, 2020, China’s new generation manned spacecraft test ship and the long march 5B carrier rocket made the first flight. After entering orbit, the new spacecraft test ship carried out a series of precise orbit changes, and its orbit apogee reached 8000 km. This is the first time that a human spacecraft has returned to such a distant place since the Apollo mission. At noon on May 8, the new spacecraft test ship successfully landed in the predetermined area, and the landing point accuracy reached a new high, which was an order of magnitude higher than the previous Shenzhou spacecraft. To achieve such a high precision, GNC system is the most important. The parachute used by the spaceship belongs to “uncontrolled parachute”, which will drift with the wind. Therefore, the position of the capsule when the parachute is opened determines the accuracy of the landing point. The new spacecraft test ship is equipped with an original technology which is different from other methods at home and abroad. Feng Ye, a member of the team, said that the method is intelligent, more flexible than traditional technology, able to cope with more complex situations, more stable control and higher precision. By using this method, not only the error of the re-entry module flying to the terminal point can be predicted in real time, but also the flight trajectory can be adjusted according to the error until it reaches the target point. The “parachute opening point” is the terminal point of the “road section” governed by the adaptive predictive correction guidance technology. < / P > < p > in addition to the manned spacecraft, the GNC system of the reentry and return flight tester for phase III of the lunar exploration project was also built by the “dream boat” team. In 2014, China lunar exploration project phase III reentry and return flight tester carried out lunar earth return jump reentry test, which created the highest parachute opening point accuracy of reentry and return of spacecraft with spacecraft shape in the world so far. Also in this test, the adaptive predictive correction guidance technology created by the team won the first battle. This year, the new spacecraft test ship further verified the advanced theory, engineering practicability and adaptability of different Frestech tasks. < / P > < p > the all digital full coefficient adaptive predictive correction guidance technology breaks through the gap between predictive guidance and control for the first time in the world, greatly simplifies and reduces the application threshold of predictive guidance. It is of typical significance in the development of control theory and in the improvement of engineering application area, and is a great contribution to the world space control field. This technology is not only suitable for lunar earth re-entry, earth orbit direct re-entry, but also for Mars entry and Mars atmosphere capture, initial re-entry of large lift body, terminal energy management, horizontal approach landing, etc. < / P > < p > the international first-class technology and the more refined achievements in Vietnam war are behind the strategic foresight of team members, especially the team leaders, who have insisted on the strategic foresight of layout and research in advance for more than 20 years, which is the unremitting struggle of all team members from generation to generation. The team adheres to the latest technology status and development direction of development tasks, tracks the frontier development of global spacecraft control technology, encourages its members to participate in the “pre research and development condition support technology demonstration group”, undertakes the pre research, common technology and research and guarantee projects, takes the talents with doctoral degree as the bottom of the team and the experienced staff as the backbone, and makes the professional configuration of members as much as possible To cover a number of technical fields and professions. At present, the “pre research and development conditions guarantee technology demonstration group” has formulated a series of key technology research directions, and has achieved fruitful results in pre research technology and project support. It has also undertaken the “863” project and applied for the key projects of National Natural Science Foundation of China and the youth fund project. The pre research projects participated by the team have made breakthroughs in many directions, and gained the attention and approval of the superior. The relevant achievements have been used in the model development tasks of manned space engineering phase III and lunar exploration project phase III, laying a solid foundation for the future development of China’s aerospace GNC field. < p > < p > in nature, the “human” shaped goose array is the fastest and most labor-saving configuration for geese. The flying speed of geese formation is 1.71 times that of a single wild goose, and the power of team cooperation is far beyond the limit of a single goose. “Dream boat” team has formed a unique “wild goose array” team culture through years of cooperative research, inheritance and development. Focusing on the four dimensions of target management, technological innovation, quality management and talent construction, the “four flying” team management mode of “leading, competing, following and flying together” is adopted to create a team atmosphere of “flying together and cooperating with each other”. < / P > < p > teams and groups give full play to the management and leading role of the “wild goose array” team, carry out the goal construction of “two trees and one construction” of “tree concept, model and mechanism” around the task objectives of the team, so as to ensure the development of team management in the right direction. Lin Yue, a member of the team, introduced: “we have long adhered to the implementation of the annual, monthly and three week level plans and assessment system, quantified the tasks and objectives, checked the completion of the plan and formed records. In recent years, the team task completion rate and annual plan completion rate have reached 100%. ” < / P > < p > at the specific management level, the team maintains the perfect formation of “geese formation” by “building a platform to show themselves; introducing mechanism and benign competition”. Based on the four aspects of “advanced research, team and team”, we have formed a strong competitive and innovative atmosphere. < / P > < p > in terms of personnel training, the team has constructed a herringbone “goose array” structure with “the chief and deputy team leaders as the leading geese, the technical platform leader as the backbone geese, and the team members as the flying geese”. It attaches great importance to the training of reserve forces, and carries out a series of multi-level training for “flying geese” based on “helping and guiding”. In view of the lack of experience of new employees, the team adopts “three methods”, namely, having plans, having good teachers and having routes, so that they can integrate into the collective as soon as possible, and ensure that “follow the flight” does not fall behind. In team building, the team takes the manned space spirit as the cornerstone, takes the “space dream” as the guide, and takes “common growth and common progress” as the principle