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Recently, Chang Guang Satellite Technology Co., Ltd. used its independently developed vehicle-mounted laser communication ground station to conduct China's first space-to-ground laser 100Gbps ultra-high-speed high-resolution remote sensing image transmission test with the "Jilin-1" platform 02A02 satellite laser terminal and successfully achieved it.
This test is another major breakthrough following Chang Guang Satellite's success in space-to-ground 10Gbps and inter-satellite 100Gbps laser data transmission tests, marking an important step for China in the field of ultra-high-speed laser network transmission integration of inter-satellite/space-to-ground.
To complete this test, the Chang Guang Satellite team conducted a comprehensive optimization and upgrade of the self-developed vehicle-mounted laser communication ground station, overcoming multiple technical challenges. The team spent two years conquering atmospheric channel compensation technology, high-precision time-frequency synchronization technology, Doppler frequency shift dynamic correction technology, high-sensitivity demodulation technology, and high-precision beam tracking and pointing technology.
These efforts solved key issues such as signal distortion caused by atmospheric turbulence, frequency drift caused by the high-speed relative motion between satellites and ground, weak light signal detection, and high-precision beam tracking, thereby establishing a long-distance, high-sensitivity coherent laser communication link between space and ground.
At the same time, in collaboration with units such as Beijing University of Posts and Telecommunications, the team successfully validated and broke through the mode diversity reception technology, further ensuring the stability and availability of laser signal transmission. In December 2024, Chang Guang Satellite successfully completed the space-to-ground 100Gbps laser communication test and obtained remote sensing images from the "Jilin-1" satellite, effectively verifying the feasibility and advancement of this series of technologies.
The breakthrough in ultra-high-speed space-to-ground laser communication technology presents huge development opportunities for China's ultra-high-resolution remote sensing satellite constellation network construction. Compared to existing remote sensing satellites, ultra-high-resolution remote sensing satellites will generate several times more data, with image data generation rates reaching tens of Gbps.
The successful breakthrough in ultra-high-speed laser communication technology significantly enhances data transmission efficiency, providing solid technical support for the rapid return of massive remote sensing images.
Chang Guang Satellite has the capability to develop ultra-high-resolution optical remote sensing satellites, comprehensively mastering 100Gbps space-to-ground and inter-satellite laser communication technology, and has successfully established an ultra-high-speed laser data transmission network.
This series of technological breakthroughs lays the foundation for the deployment and efficient operation of the next-generation remote sensing constellation. The rapid grounding of remote sensing data can better serve fields such as disaster monitoring, national defense security, smart cities, environmental protection, and emergency response. It will also provide strong technical support for the expansion of remote sensing data applications to the general user end.
Meanwhile, ultra-high-speed laser communication technology can be applied to the construction of China's satellite internet space-to-ground integrated mobile system, exploring the breaking of bottlenecks in satellite-to-ground user and feeder data grounding, offering a wider spectrum and higher data transmission rates, and helping the development from 5G NTN to 6G satellite internet.