Science and Technology Daily reporter Zhang Jiaxing
Version 1.0 solves fast problems, and version 2.0 solves fast and accurate problems. It is a huge upgrade on the basis of 1.0!
On October 14th, at the Beidou Satellite Navigation System Summit Forum, the China Academy of Information and Communications Technology (hereinafter referred to as "Institute of Information and Communications Technology") released the Beidou high-precision positioning service platform, which improved the positioning accuracy of mobile phones for civilian applications to 1.2 meters.
Liu Xu, a researcher at the Institute of Information and Communications Technology, explained, “When we navigate by car, the mobile phone often cannot tell whether it is on the main road or the side road. This is because the traditional positioning accuracy is not high.”
Based on the Beidou 2 and Beidou 3 global satellite navigation systems, the newly released Beidou high-precision positioning service platform (Beidou Positioning Version 2.0) can achieve second-level positioning and increase the positioning accuracy to 1.2 meters (the accuracy can reach submeters when equipped with a vehicle antenna Level), and the high accuracy of 1.2 meters means that lane-level positioning can be achieved.
Beidou No. 3 "landing", ordinary people can enjoy
On July 31, China's independent construction and independent operation of the Beidou-3 global satellite navigation system was fully completed, opening high-quality global services.
How do ordinary people apply to Beidou-3?
Through the Beidou high-precision positioning service platform of China Academy of Information and Communications Technology, ordinary people can use Beidou's high-precision positioning through mobile phones.
"The release of Beidou positioning service version 2.0 means that the use of mobile phones to achieve lane-level high-precision positioning has entered official commercial use." Liu Xu said, "You only need to upgrade the firmware and software version, without installing hardware, to achieve lane-level positioning. "
The reason why Beidou Positioning 2.0 can realize high-precision positioning services is based on a more three-dimensional display of data.
Liu Xu said that based on the layout of the Beidou-3 system, in addition to providing ephemeris data, the positioning platform also provides more parameters such as high-precision orbital differences and high-precision ionospheric models. The layout and data acquisition of the global satellite navigation system.
On the basis of the original rapid positioning service, version 2.0 has been upgraded in accordance with international standards. The broadcast ephemeris and PPP auxiliary data will be sent to smart terminals together. There will be more parameters at the chip and data application level to achieve high-precision positioning. .
1.0 to 2.0, from catching up to going hand in hand to winning with features
When the Beidou system was just getting started around 2000, GPS had already formed a mature application. There was a huge gap and we had to catch up.
"As of 2013, Beidou's positioning is still calculated in minutes. This is because satellite positioning requires calculation of relative position." Liu Xu said, this information called "ephemeris data" needs to be obtained from satellites. For direct download, the satellite is too high and the playback intensity is weak. It takes at least 30-50 seconds for the ground and the satellite to "know" each other's position, and then it will take longer to solve.
Such positioning time is difficult to meet daily needs, and users simply cannot accept it, let alone achieve competition with GPS.
Since the "longest board" of positioning time is the acquisition of "ephemeris data", then the "pain point" must be hit directly to shorten the positioning time significantly.
Is it possible not to download the ephemeris data from the satellite?
The answer is yes.
Liu Xu explained that if there is a platform that puts the required ephemeris data on the server, ground positioning requests can be directly accessed by the server, which will greatly reduce the time.
"A file with ephemeris data less than 1KB can be transmitted in milliseconds. In the end, the positioning can be successful in three or four seconds."
In 2018, China's high-precision location network and its major applications in the transportation field won the first prize of the National Science and Technology Progress Award, including the research of network-assisted rapid first positioning technology.
"At that time, what was achieved was: GPS has Beidou and also." Liu Xu said that version 1.0 has also achieved good results. At present, the daily active users have reached 180 million, and the daily business volume has exceeded 3 billion.
How to attract more users and show the advantages of China's Beidou GPS?
"If Beidou and GPS keep going hand in hand, the original gap will always exist. How to shorten the gap requires differentiated services to promote the development of the entire Beidou industry." Liu Xu said that the 2.0 version will provide users with GPS Different user experience guides users and manufacturers to actively use Beidou to build a better “Beidou ecology”.
"In the past, some people thought that GPS was enough, or that Beidou and GPS are homogenous, but now the differentiation is emerging." Liu Xu said that China Beidou is creating more applications "blue ocean."
Source: Science and Technology Daily