On May 21st, the relay satellite "Queqiao" of Chang'e-4 was successfully launched from the Xichang Satellite Launch Center. As a crucial part of the Chang'e-4 lunar exploration project, the successful launch of "Queqiao" marked that China had successfully taken the first step in the lunar landing mission on the far side of the moon.

       Because the rotational speed of the moon is the same as its orbital speed, the far side of the moon cannot be seen from Earth. Therefore, the Chang'e-4 mission needs to first launch a relay satellite to solve the communication problem with the far side of the moon. This will also be the world's first relay satellite connecting the Earth and the moon, and it will build an information path for the rover combination to safely reach the far side of the moon.

       With the development of deep space exploration and the exploration of celestial bodies and space beyond the moon, human space activities have expanded to celestial bodies such as the moon and Mars. This has led to many technical challenges, such as a significant increase in the loss of communication control signals over long distances, low coverage, and large delays. To overcome the shortcomings of the ground-based communication control network and to adapt to the development of future space technologies, it is necessary to seek new space communication control systems and more optimal transmission methods to achieve data communication between satellites and ground stations. The application of relay satellite technology has emerged as a result. Relay communication in orbit refers to the use of relay satellites as forwarding stations to relay and forward the signals of lunar orbiting and landing spacecraft. Generally, it utilizes a relay satellite that is visible to the Earth for a long time to establish a round-the-clock, real-time, high-speed communication link between the lunar orbiting or landing spacecraft and the ground station, providing data relay and control services for satellites, spacecraft, etc., and enabling real-time transmission of scientific data to the ground, greatly improving the utilization efficiency of such satellites.

       From the above applications, we can see that in the engineering applications of wireless transmission, if there is an obstacle or other circumstances preventing direct transmission between two points, transmission can be achieved through a relay method. In actual engineering applications, it is necessary to find a suitable relay point to enable normal wireless communication between the two points. Thus, we can see how widely the transmission method of wireless relaying is applied. Shenzhen Shenfang Technology Co., Ltd. is a high-tech enterprise specializing in the research and development, sales, and integration of wireless products. It can provide customers with professional wireless transmission application solutions. If you encounter any problems in wireless applications, please contact our company at any time. We can develop a professional wireless solution for you.