China’s aerospace technology is very impressive. It can be said that it is the second largest presence in the world, second only to the United States. At 20:45 on Friday, the closely watched Long March 5 yao-3 launch vehicle put the shijian-20 satellite into the predetermined orbit, and the successful launch inspired the hearts of the Chinese people. Such an accurate launch is naturally supported by sensing and navigation technology, which is MEMS and positioning technology. The rocket of the long march series has successfully reached the fifth generation. People call it “fat five”. According to the editor of OFweek electronic engineering network, many core technologies of this rocket are independently developed by China. It can be described as a “real” domestic large rocket. The power system and sensing test technology are applied, which greatly improves the accuracy of the rocket. China’s aviation technology continues to make breakthroughs. It is believed that China’s self-produced large aircraft will be available soon in the future. What an exciting moment.

Aerospace technology is inseparable from the support of sensing technology

MEMS technology helps fat may day fly to the sky

MEMS technology is a technology that has experienced ups and downs. Since the 1970s, MEMS has evolved from sensor technology and gradually formed a MEMS with intelligent “brain”, and its application has gradually expanded from aviation to civil use. Now, MEMS technology is “everywhere” and has become a standard semiconductor technology. MEMS is a revolutionary new technology, which is developed on the basis of semiconductor manufacturing technology. MEMS is a high-tech electromechanical device made by integrating lithography, corrosion, thin film, Liga, silicon micromachining, non silicon micromachining and precision machining.

MEMS system has a very important application in the national economy. With the promotion of intelligent products, MEMS also has its own advantages in intelligence. With the increase of massive positioning demand, satellite navigation is inseparable from inertial navigation. China’s Beidou satellite will complete the basic global layout in 2020, and Beidou can be used to realize high-precision position service in China. ADI technology will be more widely used. Inertial navigation is needed to connect massive location requirements to the network. Nowadays, the minimum navigation accuracy of Beidou is 2.5 to 5 meters. For many applications, this accuracy is far from enough. At this time, it is necessary to improve the navigation accuracy of the satellite with the help of MEMS technology.

With the continuous advancement of “industry 4.0” and “made in China 2025”, MEMS sensors have ushered in great development opportunities. Compared with the consumer market, the industry has higher requirements for sensor performance and extremely demanding requirements for product life and reliability. In particular, the sensor performance needs to be stable and reliable in a harsh environment, which is very difficult to achieve. However, this brings great opportunities to many MEMS technology enterprises. Who can solve the industry pain first, Who will grasp the market opportunity.

Principles of satellite navigation

It is reported that the major task of this rocket is to send the 20th satellite into space, and satellite navigation is also an important scientific research project in China and a fundamental science for the benefit of the country and the people. What is the principle of satellite navigation? In fact, it is not difficult to understand. According to the relevant technicians interviewed by the editor of OFweek electronic engineering network, global satellite navigation system refers to a space-based radio navigation and positioning system that can provide users with all-weather three-dimensional coordinates, speed and time information at any place on the earth’s surface or near earth space, The principle is that the distance measurement between the satellite and the user is based on the difference between the transmission time of the satellite signal and the time to reach the receiver, which is called pseudo range. In order to calculate the three-dimensional position of the user and the clock deviation of the receiver, pseudo range measurement requires to receive signals from at least four satellites. At present, there are four major satellite positioning systems in the world. In addition to China’s Beidou satellite navigation system (BDS), there are also the US global positioning system, that is, GPS, Russian GLONASS satellite navigation system and Galileo satellite navigation system.

BDS navigation system helps the development of aerospace industry

China’s self-developed global satellite navigation system consists of three parts: space segment, ground segment and user segment. It can provide high-precision and reliable positioning, navigation and timing services for all kinds of users around the world all day and all day. It also has short message communication capability. It has preliminarily possessed regional navigation, positioning and timing capabilities, with a positioning accuracy of 10m, The speed measurement accuracy is 0.2 M / s and the time service accuracy is 10 nanoseconds.

This time, fat may day soared to the sky, followed by fat six and fat seven. China’s aerospace technology will gradually develop with the progress of science and technology, and finally be quoted into people’s life. I hope this success can make the sensing and navigation industry soar to the sky.

Responsible editor: CT


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