The story of Huawei Mate 50 / Pro series XMAGE imaging technology and Beidou satellite communication research and development

A few days ago, the HDC2022 Huawei Developer Conference was held. During the conference, Huawei held the "Huawei Mobile Phone Innovation Technology Media Communication Conference". During the communication conference, Bruce Lee, Vice President of Huawei Terminal BG Mobile Phone Product Line, gave an impression of the XMAGE images carried on the Huawei Mate 50 series. Technology and Beidou satellite short message function for in-depth technical interpretation and story sharing during R&D.

Huawei Imaging XMAGE Three Technological Breakthroughs

In July this year, Huawei officially announced the launch of its own imaging brand, XMAGE, to upgrade imaging technology, style, and experience. In September, Huawei's Mate 50 series was equipped with a super-optical XMAGE imaging system, realizing a number of technological breakthroughs. XMAGE focuses on four imaging modules: optical system, mechanical structure, imaging technology, and image processing. From the four dimensions of optomechanical computing, the entire system of XMAGE imaging system is established.

Taking the optical system as an example, the super-optical variable camera on the Huawei Mate 50 series adopts the technology of variable aperture, which can achieve a ten-stop adjustable aperture at the physical level, bringing technological breakthroughs in three optical systems.

The first is a technological breakthrough. The entire lens module adopts a high-precision component design and assembly process to create a physical large aperture of F1.4. The overall structure has a total of 23 precision components, including high-precision annular magnetic field micro-control motors, physical aperture blades, and other innovative originals, with a maximum precision of 5-10μm micron level.

The second is a breakthrough in the ability to control the amount of light. It is a technical difficulty of the optical system to realize the technical solution of the variable aperture and match the appropriate amount of incoming light for different light environments, thereby bringing the best imaging effect. In order to achieve precise control of the amount of incoming light, Huawei has pioneered a high-precision full-process calibration and detection solution. After more than 20 versions of blade design and verification, coupled with a set of high-precision drive control algorithms, the 6 metal aperture blades can be physically opened and closed to achieve the effect of a 10-stop aperture change.

The third is a breakthrough in aesthetic design. The high-reliability aesthetic design is the product gene of the Huawei Mate series. Huawei has pioneered the integrated metal coating solution for the appearance of the blade. The blade adopts a new material of high-modulus, bright, and high-strength aluminum, which further reduces the structural weight and achieves a 20-fold increase in strength.

In this Huawei Mate 50 RS Porsche design, a 3.2mm ultra-long mechanical stroke motor is also introduced, and the first time in the industry to adopt a dual-mirror group focusing structure design, which can use the moving focus between the mirror groups for secondary calibration, Further improve the optical resolution in macro mode.

In the XMAGE image style, Huawei has also established its own color image style. The image color research team established by Huawei brings together expert teams from seven Huawei research institutes around the world, including China, Finland, Japan, and the United Kingdom. The submissions of 3.3 million+ users of the Huawei New Image Contest are samples to establish Huawei's exclusive image style, which is characterized by: realism, moisturizing, transparency, and breathing.

In terms of color, Huawei has also cooperated with the Color Research Institute of the Art and Research Center of Tsinghua University, based on the theoretical basis of the "color science" system, to extract the color tone of the XMAGE style. On the basis of XMAGE's primary color, it does not change the inherent color of the object and only adjusts from the two dimensions of saturation and lightness. Under the condition of retaining the content of the photo, it presents a bright and bright tone, forming a complete and systematic color tone system.

Technological Challenges Overcome by Beidou Satellite Communications

The meeting also introduced the story behind the Beidou satellite news of the Huawei Mate 50 series. In July this year, the Beidou-3 short message communication function gradually matured, and two-way information can be generated and received in the absence of a communication network. In the technology research and development stage, there are three major challenges for popular smartphones to support Beidou satellite news.

Due to the high loss, Huawei communicates with the GEO satellite of the Beidou-3 system for short messages, and the single-satellite coverage of the GEO satellite is very wide and can better resist shading. However, the operating orbit height is about 36,000 kilometers, and the higher the satellite, the greater the transmission loss of the transmitted signal, and the more difficult it is for the signal transmitted from the ground to be accepted by the satellite.

Low power and high signal loss of high-orbit satellite transmission require strong signal transmission power of ground equipment, but the thin and light body of the mobile phone determines that the device for power transmission must be very small.

Low gain, compared with the huge transceiver antenna of conventional satellite phones, the gain of mobile phone antenna equipment is also very low.

In order to solve these technical difficulties, Huawei has built a set of communication protocols that can meet the needs of mobile satellite communication, including a new communication system, protocol stack, and application bottom layer protocol. First of all, facing the problem of insufficient hardware power, Huawei has developed an antenna design including high-power PA, low-loss RF link, and consistent sending and receiving patterns in the Mate 50 series, which can effectively improve the long-distance communication power of mobile phones and reduce the distance between mobile phones and satellites. Signal loss in intercommunication.

At the algorithm level, Huawei has also designed a new encoding and decoding algorithm and introduced a high-gain Polar encoding scheme to reduce interference and noise during satellite communication transmission and improve the signal decoding rate.

After completing the technical preparation, in order to verify the availability of satellite communication technology, Huawei has also established a complete closed loop of testing and verification. Through specially designed UX satellite finder guidance to send signals to analog satellites, and use terminal equipment to receive signals, a complete set of Beidou-3 end-to-end satellite-ground fusion communication verification systems has been established.

From the establishment of the project in December 2019, the feasibility analysis will be completed in April 2020, and the laboratory connection will be completed in February 2021. After 18 months of off-site testing, 31 provinces, seven major landform environments such as Gobi, desert, and no man's land were tested, and finally, the Beidou satellite message function was presented to the public.

At the same time, Huawei also announced that Huawei Mate Xs 2 will also support the Beidou satellite message function, and will officially open the public test on November 5th.

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