Scientists from China have achieved a world-first breakthrough in space technology by conducting daytime satellite laser ranging within Earth-moon space. The Yunnan Observatories of the Chinese Academy of Sciences announced this milestone on Tuesday, overcoming significant challenges posed by solar interference.
Using an upgraded near-infrared laser system on a 1.2-meter telescope, researchers captured signals from the Tiandu-1 satellite approximately 130,000 km from Earth. Lead researcher Li Yuqiang explained the team successfully suppressed solar background noise—a critical advancement enabling precise measurements during daylight hours.
This development enhances navigation accuracy for current and future lunar missions, supporting major projects like the International Lunar Research Station. The achievement involved collaboration between China's Deep Space Exploration Lab, multiple CAS institutes, and domestic universities.
The Tiandu-1 satellite, launched in March 2024, continues to orbit between Earth and the moon as a test platform for advanced communication and navigation technologies. Experts suggest this innovation could redefine standards for deep-space exploration infrastructure.
