China achieves first-ever laser measurement of Earth-Moon distance

China achieves first-ever laser measurement of Earth-Moon distance

China has made a significant advancement in deep-space exploration with its successful satellite laser ranging at the Earth-Moon distance. The achievement, announced by the Chinese Academy of Sciences (CAS), marks the first-ever precise laser measurement of a satellite, DRO-A, located approximately 350,000 kilometers away. This measurement was made possible by a unique single-corner-cube reflector onboard the satellite and a ground-based 1.2-meter telescope system.

This breakthrough places China among a select few nations capable of performing high-precision lunar-distance measurements. Experts believe such accuracy is essential for future lunar missions and deep-space navigation. Zhang Wei, the chief engineer of the project, emphasized that the success of this laser ranging lays the foundation for centimeter-level precision in lunar and deep-space measurements.

The satellite's reflector, developed by the Shanghai Astronomical Observatory, overcame several challenges, including precise angular control and maintaining thermal stability in extreme space conditions. Additionally, the Yunnan Astronomical Observatory played a critical role in optimizing the ground system to detect extremely weak signals and make fine adjustments to the telescope, ensuring successful measurement.

This achievement, led by the Innovation Academy for Microsatellites and other CAS institutes, demonstrates China's growing capabilities in space technology. Future plans aim to expand participation in ground station operations and refine reflector designs, further solidifying China's leadership in Earth-Moon exploration.