Recently, Changguang Satellite Technology Co., Ltd (Changguang Satellite for short) has carried out China's first interstellar laser 100Gbps ultra-high-speed and high-resolution remote sensing image transmission test by utilizing the independently-developed "Jilin I" platform 02A01 star and platform 02A02 star, and achieved success, and the technology has reached the international advanced level.
The "Jilin-1" constellation is the core project under construction of Changguang Satellite, which has successfully realized the milestone of "100 Stars in the Sky" and gradually become an important source of space remote sensing information in the world. With the continuous improvement of time resolution and space resolution of the constellation, how to further improve the timeliness of data transmission has become a common problem faced by large remote sensing satellite constellations. in November 2021, Changguang Satellite set up a team of researchers, and in line with the design principle of "simplicity and reliability" and the design concept of "integration of the satellite and the laser terminal", Changguang Satellite set up a team of researchers to design the satellite and the laser terminal. In November 2021, Changguang Satellite set up a research team and, based on the design principle of "simplicity and reliability" and the design concept of "integration of satellite and laser terminal", independently developed a high-bandwidth, multi-mode and high-precision inter-satellite laser communication terminal based on business application, and steadily pushed forward the validation of the key technology of inter-satellite laser communication.
The interstellar laser communication terminal independently developed by Changguang Satellite supports various communication modes such as interstellar communication in the same orbit, interstellar communication in different orbits and interstellar communication on star-earth, etc.; in the design of the communication system, it is equipped with two modes of non-coherent system and coherent system of data transmission, with the highest support rate reaching 10Gbps and 100Gbps, etc. The team has overcome the problems of high-coupling-efficiency multi-optical-axis coherent assembly, high-precision capture and tracking control, high-bandwidth and high-precision laser communication. capture tracking control, high-bandwidth coherent communication and other key technologies. This series of technologies not only promotes the development of China's space laser communication technology, but also provides a more advanced and reliable solution for future space communication.
As of January 10, 2024, Changguang Satellite has successively completed the interstellar high-speed laser communication tests at 10Gbps and 100Gbps rates, with a communication BER of 0 during the stable chain building period, and the high-resolution remote sensing images transmitted between the stars were successfully downlinked, marking China's first realization of the interstellar laser 100Gbps ultra-high-speed high-resolution remote sensing image transmission.
In the previous period, Changguang Satellite utilized the self-developed vehicle-mounted laser communication ground station to successfully complete the star-ground bi-directional chain building with "Jilin No. 1" MF02A04 star, with a communication rate of 10 Gbps, by which Changguang Satellite has fully mastered the star-ground and interstellar laser high-speed communication technology, and established a space high-speed laser data transmission network test system, which is the first time for China to realize inter-stellar laser 100 Gbps ultra-high-speed high-resolution remote sensing image transmission. It has provided a solid technical foundation for the construction of space-based/ground-based integrated laser communication transmission network, provided technical guarantee for the real-time transmission of massive image data of ultra-high resolution remote sensing constellations, and taken a solid step forward for remote sensing information to better serve the public users.
The success of interstellar laser communication is of great significance to the rapid return of remote sensing data and real-time monitoring in orbit. Meanwhile, the space high-speed laser data transmission network test of remote sensing satellites can provide important technical support for the large-scale network construction of Internet satellite constellations, which can not only help build a large-scale high-speed and low-latency space bearer network, but also explore new ways to break the bottlenecks of star-earth users and feeder data landing.
