Shulou(Shulou.com)11/24 Report--

"as the first satellite launched by Dalian University of Technology and the first satellite launched by Liaoning Province, the new technology it carries is an opportunity and challenge," Yu Xiaozhou said in the laboratory of Dalian University of Technology. "

On May 10, the Tianzhou-6 cargo spacecraft, carried by the long March 7 carrier rocket, rocked up to the space station, and the launch mission was a complete success. "Dalian 1-Lianli Satellite", the first satellite in Liaoning Province, designed and developed by the research team of the School of Aeronautics and Astronautics of the Department of Transportation Engineering and Mechanics of Dalian University of Technology, flew into space aboard the Tianzhou-6 cargo spacecraft.

"the satellite is full of blood and spare no effort."

The task of Dalian No.1-Lianli Satellite is to cooperate with the 7.3m X-band ground measurement and control station of Dalian University of Technology to realize the measurement and control operation of mission uplink and data downlink. It mainly carries out low-cost sub-meter-level high-resolution ocean and ground observation and new technology verification.

As the commander-in-chief of Dalian No.1-Lianli Satellite, Yu Xiaozhou, a professor at the School of Aeronautics and Astronautics of Dalian University of Technology, is well aware of the importance of the satellite to himself and to Dalian University of Technology. In his view, the research and development in the past three years is the result of the collective persistence of Xia Guangqing, dean of the School of Aeronautics and Astronautics of Dalian University of Technology, and the micro-nano satellite and electric propulsion team. In order to launch smoothly, the hard work of going to Beijing every few days over the past six months has also become sweet.

Yu Xiaozhou is no stranger to satellites. He has presided over satellite research and development and launch missions many times before, and Xia Guangqing's invitation for research and development made him very excited. For satellites, he still hopes to pour warm blood and spare no effort.

What kind of help can Dalian-Lianli satellite provide to basic research? Yu Xiaozhou talked about, taking Dalian as an example, as a marine city, it has a large number of marine industries and dense shipping routes. Dalian can be assisted in marine industry planning through satellites. Dalian No. 1-Lianli Satellite has made an international breakthrough in technology. as a high-resolution multispectral camera carried by a 20 kg micro-nano satellite (usually a satellite with a mass between 1 kilogram and 100 kg), it can achieve sub-meter resolution in the full-color band in orbit and can be used for earth observation, which can effectively provide assistance for Dalian's agricultural application and urban planning.

Behind the technological breakthroughs is the result of the struggle between despair and determination to give up again and again. Toughness has shaped the innovative technology of Dalian 1-Lianli satellite, which has also given it its own international name. Yu Xiaozhou was deeply impressed by this: "in the early days of the satellite R & D project, due to the obstacles of objective conditions such as COVID-19 's epidemic situation, many components could not be obtained immediately; many parts could not be processed; and the soaring unit price of the imported system and other reasons led to many difficulties. Especially in the detection before the need to dock with the spacecraft, it is found that there is a lack of devices, but to achieve docking, the device is indispensable. What stands in the way of successful docking is not price and matching, but no way to find a way. I ran all over the electronic market and searched the Internet, but later I bought it in Zhengzhou, and then in order to be able to catch up with the docking test time during the epidemic, I rushed to Beijing in time to complete the test. "

"lack of core and less system, it's time to do it yourself."

Different from the propellant used in the traditional satellite attitude and orbit control power system, the new propulsion system used by this satellite can not only greatly improve the fast maneuverability of the satellite in orbit, but also has the characteristics of non-toxic, high energy, low power consumption, pre-packaging and so on.

Yu Xiaozhou mentioned that the lack of domestic operating systems suitable for micro-nano satellites in the past has restricted the development of micro-nano satellites in China. In 2021, many domestic aerospace research institutes jointly developed a series of high-performance micro-nano satellite based on OpenHarmony. This time, Dalian No. 1-Lianli satellite is carried by OpenHarmony after secondary development, using the operating system run by domestic chips, which greatly improves the reliability and real-time performance of the satellite.

In the comparison of two kinds of systems and chips at home and abroad, Yu Xiaozhou found that in order to stabilize the foreign solutions, there may be uncertainties under the influence of the general environment, and the use of domestic processors in key systems is a very important decision. During the adaptation process, Yu Xiaozhou personally compared the performance of the two processors, and the test results were basically similar. at the same time, the cost of the domestic processor was lower, and the after-sale was more timely, which made the team unanimously approve the domestic scheme. In order to be more sophisticated in the design of domestic systems, the team introduced the OpenHarmony operating system, which is better suited to domestic chips, and Yu Xiaozhou officially opened the road of research and development of applying OpenHarmony to satellites. Then, in early 2022, led by the Open Atomic Open Source Foundation, the Software Institute of the Chinese Academy of Sciences, Dalian University of Technology, Tsinghua University, Wuhan University, Shanghai Micro Satellite Innovation Research Institute, Changguang Satellite, Love Space Science and Technology, and Aerospace Creator jointly established the Open Source Hongmeng Aerospace working Group (OpenHarmony In Space, OHIS). Dalian University of Technology is the group leader, because Xiaozhou serves as the leader of the working group. Responsible for the research and application promotion of aerospace high reliable real-time operating system based on OpenHarmony.

Yu Xiaozhou said, "the addition of OpenHarmony provides a better solution for the reliability of the satellite subsystem, thus sharing a lot of operating pressure, and can be better invested in the improvement of overall efficiency." Foreign satellites mostly use high-performance, highly reliable real-time operating systems, and in the field of micro-and nano-satellites, most of them use the free RTOS open source operating system. The reason why they are provided free of charge also makes the early domestic satellites taste the 'sweetness', but now it seems to be similar to 'naked running'. And this situation also makes domestic satellites fall into a more awkward position. Without the support of foreign chips, the open source operating system will lose its effect, and the system and hardware entangled as a whole have also become the shackles that domestic R & D personnel need to cross technological research and development. "

"Lianli launched, paving a way for the training of aerospace talents."

Scientific and technological self-reliance and self-improvement is the foundation of a country's strength and security. Over the past 60 years and more, China's aerospace has continuously promoted independent innovation, from the great achievements of building "two bombs and one satellite" from scratch to repeated breakthroughs in major space projects represented by manned spaceflight and lunar exploration, to make positive contributions to speeding up the construction of a space power. "when there was a shortage of chips, the asking price increased tenfold, and the R & D process fell into a passive position, which forced us to turn to domestic chips and urge us to accelerate at various R & D levels in the industry from another perspective," Yu said. "

The 14th five-year Plan for the Development of Intelligent Manufacturing puts forward that persisting in innovation has a core position in the overall situation of China's modernization, and the Plan regards the self-reliance of science and technology as the strategic support for national development. The realization of high-level scientific and technological self-reliance is a complex system engineering, and strengthening basic research is the urgent requirement and foundation of high-level scientific and technological self-reliance. Yu Xiaozhou has deep feelings about this. The cycle of basic research is long, and it is necessary to withstand loneliness. For example, chip research is extremely difficult, and there is an obvious gap between Yu Xiaozhou and foreign countries, but even so, you still need to settle down to engage in scientific research. With technological progress, many domestic technologies have achieved breakthroughs, and many research institutes in the aerospace field attach great importance to the research and development of the operating system, hoping to invest in research and development together and formulate their own standards. The accession of OpenHarmony is timely and has contributed a lot to the development of the aerospace industry. " At present, we are also working with our counterparts to develop an aerospace standard for on-board real-time operating systems based on OpenHarmony, hoping to promote it to the world so that foreign satellites can also use Chinese standards. "

Different units and enterprises also expressed their support for Dalian No. 1-Lianli Satellite. Sun Wenlong, chairman of the Open Atomic Open Source Foundation, also visited the booth of Huawei developer Conference 2023 at Dalian University of Technology. He said that the successful launch of OpenHarmony carrying Dalian No. 1-Lianli satellite has enriched the use of OpenHarmony, promoted the prosperity of the OpenHarmony community, and truly realized the heaven and earth of OpenHarmony. He hopes that with Lianli Satellite as the starting point, more astronauts can promote the construction of open source system, release the development potential of open source, and promote the high-quality development of OHIS. Yu Chengdong, managing director of Huawei and consumer BG CEO, also demonstrated Dalian 1-Lianli Satellite as an industry application case in his speech on the first day of this year's Huawei developer conference. It is reported that with Dalian 1-Lianli satellite, a certain electromagnetic double star, love space science and other satellite projects using the OpenHarmony operating system, more satellite projects will choose OpenHarmony in the future.

As the first satellite launched by Dalian University of Technology and even Liaoning Province, the successful launch of Dalian-Lianli satellite has undoubtedly made a good start for the satellite development and launch work of Dalian University of Technology. According to the plan, Yu Xiaozhou will continue to develop new satellites in the future. Yu Xiaozhou talked about the direction of future satellite research and development, one is to concentrate scientific research efforts to develop higher-end scientific research satellites, and the other is to organize students as the main body of research and development to develop some teaching satellites with the main purpose of training students' scientific research and hands-on ability. As the trial and error conditions of aerospace personnel training are extremely stringent, the reliability requirements are extremely high, and aerospace talents are cross-disciplinary and cross-disciplinary, the training process is full of challenges. Xia Guangqing has said that although the successful launch of Dalian-1-Lianli satellite is important, we hope to find a way for the discipline construction and personnel training of the school.

Sixty-six years ago, Sputnik 1, man's first man-made earth satellite, launched into space, announcing the arrival of the human space age. At that moment, the desire to explore in human hearts was released, and began to touch the distant stars and sea, expanding the boundaries of the universe. Today, human beings can touch the boundless stars, turn their eyes to more distant galaxies, launch satellites, manned spaceflight, explore the moon and Mars, constantly write a new chapter in space exploration, not only to realize dreams and challenge the unknown. What is more important is to expand the space for human survival and development. Dalian 1-Lianli satellite is only a bright pearl in China's aerospace history, but it also represents the ambition of a generation of Chinese aerospace researchers.

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