The Inaugural Geosynchronous Orbit SAR Satellite Successfully Enters Operational Orbit
China has made a significant breakthrough in space technology with the successful deployment of the world’s first geosynchronous synthetic aperture radar (SAR) satellite. The L-SAR4 01 satellite, launched on August 13, has entered its working orbit and its SAR antenna has been successfully deployed, according to the China National Space Administration (CNSA).
SAR technology uses radio waves to produce high-resolution images, allowing it to capture images at night and penetrate through clouds and smoke. Unlike optical images, which rely on sunlight, SAR is a 24-hour, all-weather technology. Currently, all in-orbit SAR satellites operate in low Earth orbits (LEO) with altitudes below 1,000 km. The geosynchronous SAR satellite operates at an altitude of approximately 36,000 km, significantly higher than LEO SAR satellites. This allows for a shorter revisit period of one day, compared to the longer revisit periods of LEO SAR satellites.
The development of the L-SAR4 01 satellite took 15 years of research from the China Academy of Space Technology. The satellite features a large-diameter circular reflector antenna with a phased array feed scheme, which represents significant progress in fundamental theories, system design, and precision manufacturing. The satellite is designed to provide services for various industries, including disaster prevention and mitigation, resource prospecting and exploration, water conservancy, meteorology, agriculture, environmental protection, and forestry.
The L-SAR4 01 satellite is expected to play an important role in improving China’s space-based disaster monitoring system. It will enhance observation methods in key regions of China and contribute to disaster prevention, reduction, and relief efforts. As the most widely used remote-sensing satellite in China, it is listed in the country’s national medium and long-term development plan for civil space infrastructure.
China has made significant progress in its space program in recent years. In 2022 alone, the country launched over 200 satellites, and its national civil space infrastructure system is taking shape. The construction of national space infrastructure and space information services, such as ubiquitous connectivity and precise spatiotemporal data, will continue to be a priority for China.
The successful deployment of the L-SAR4 01 satellite marks a major milestone in space technology. China’s advancements in SAR technology will have far-reaching implications for various industries, enabling better disaster prevention, resource exploration, and environmental monitoring. As China continues to invest in its space program, we can expect further breakthroughs and advancements in the field of remote sensing and satellite technology.
