Recently, the European Global Navigation Satellite Systems Agency (GSA) reported the news released by Xiaomi 8 at a large length on its official website.
GNSS（Global Navigation Satellite Systems）， The Chinese version is Global Navigation Satellite System (GNSS), which refers to transmitting signals with time and position data to the GNSS receiver on the ground through a series of navigation and positioning satellites in space, and then the receiver calculates the position through these data.
By definition, GNSS system provides global coverage, including Galileo in Europe, GPS in the United States, GLONASS in Russia and Beidou satellite navigation system in China.
GSA said that Xiaomi 8 is the world's first smartphone equipped with dual band GNSS, and also the world's first mobile phone that can provide decimeter level positioning and navigation accuracy.
The full report is as follows:
Xiaomi 8 was released on May 31, carrying the BCM47755 chip of Broadcom, becoming the first smart phone in the world that can provide decimeter positioning accuracy for positioning services and vehicle navigation.
Xiaomi has released the world's first smartphone Xiaomi 8 that supports dual band GNSS. This smart phone is a breakthrough representative of GNSS technology and the first commercial use of Broadcom's revolutionary BCM47755 chip.
The BCM47755 of Broadcom released last year is a chip that supports dual band (E1/L1+E5/L5) GNSS. It can improve the accuracy of positioning calculation to the decimeter level. Previously, mobile applications relying on location services were limited to single frequency GNSS, and their accuracy was always limited to meters. However, in recent years, GNSS has launched many satellites supporting new frequency bands. In particular, most Galileo positioning systems are composed of satellites with E1/L1+E5/L5 frequency bands, which adds new possibilities for improving positioning accuracy.
Use Galileo satellite to improve accuracy
Xiaomi 8 and the end product users who will use dual band GNSS in the future will get better positioning and navigation experience in the urban environment. This depends on the particularity of E5/L5 frequency band, which can more easily distinguish the real signal from the signal reflected by the building to reduce the impact of multipath effect (multipath effect is the main source of navigation deviation in cities and other challenging environments). A large number of Galileo satellites can broadcast E5 signals to provide global users with accurate positioning. In addition, using dual frequency signals at the same time can reduce the signal error caused by the ionosphere, and multi frequency signals are more anti-interference.
In addition to existing applications that can be more accurately located, dual band GNSS can also provide more opportunities for new applications such as augmented reality, vehicle navigation and mapping.
Gian Gherardo Calini, head of market development of GSA (European Global Navigation Satellite System Agency), commented on the product release that the world's first dual band GNSS smartphone entering the mass market is a breakthrough for users all over the world, "More accurate positioning accuracy can help developers create new applications to meet the increasingly high positioning needs, and can also open applications that previously could only run on dedicated devices."
Alex Chou, vice president of product marketing of wireless communication and connection department of Broadcom, said: "Broadcom is pleased to see that Xiaomi's latest flagship mobile phone has applied dual band GNSS technology. As the first smart phone in the world to use BCM47755, Xiaomi 8 has raised the positioning and navigation of smart phones to a new level."
Zang Zhiyuan, Xiaomi's product marketing director, said: "GPS is a great invention, especially important for smart phones. Now map navigation app and LBS based app are more and more accurate for positioning, and dual band GPS can effectively improve their experience. Xiaomi is very honored to be the first mobile phone manufacturer in the world to support dual band GPS function. We will continue to innovate, so that every consumer in the world can enjoy the beautiful life brought by technology. "
New era of positioning service
The release of the world's first dual band GNSS smartphone, coupled with the access rights to GNSS raw data provided by the Android system, has created exciting opportunities for location service developers. Access to GNSS raw data opens the door for mobile phones to use more advanced positioning algorithms. Previously, only more advanced satellite positioning receivers could use relevant algorithms. This allows ordinary users to fully enjoy the unique advantages of Galileo positioning system.
Considering the above opportunities, since last year, GSA (European Bureau of Global Navigation Satellite Systems) has encouraged relevant scientific research institutions and companies in the field of satellite navigation and positioning to carry out innovation around GNSS raw data and serve as a part of the GNSS raw data working group. In January this year, GSA released a white paper on the application of GNSS raw data in the Android system, providing developers with an in-depth introduction to the acquisition of raw data, as well as guidance on the application of these data to introduce advanced GNSS technology to mass market devices.
On this basis, the GSA headquarters in Prague will hold a symposium on the theme of "GNSS raw data: from research to commercial use" on May 30. At the meeting, GSA and the GNSS raw data working group will share the latest progress in this field, and Broadcom will also announce the excellent test results of the dual band positioning system BCM47755.
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