Core Insights - The successful completion of laser ranging technology tests in daylight conditions by the Tian Du No. 1 satellite marks a significant breakthrough in precision measurement in deep space, allowing for operations that were previously limited to nighttime only [1][3] - The Tian Du No. 1 and No. 2 satellites are part of a broader initiative to develop a comprehensive lunar navigation and communication constellation system, with the first satellite launched in March 2024 [3] Group 1 - The Tian Du No. 1 satellite successfully conducted laser ranging tests under strong sunlight interference, overcoming challenges posed by background noise that previously restricted operations to nighttime [1] - The technology's successful application expands the observable window for laser ranging, providing a practical engineering foundation for future deep space navigation and positioning capabilities [1][3] - The test was led by the Deep Space Exploration Laboratory, with collaboration from various institutions including Shanghai Satellite Engineering Research Institute and the Chinese Academy of Sciences [3] Group 2 - The Tian Du No. 1 and No. 2 satellites have completed multiple technical tests, including inter-satellite microwave ranging and reliable transmission routing between the Moon and Earth [3] - The advancements in laser ranging technology will support major future deep space exploration projects, such as the International Lunar Research Station [1][3]

Core Viewpoint - The successful completion of the lunar laser ranging technology test by the "Tiandu-1" satellite under daytime strong light interference marks a significant technological breakthrough for China in the field of precise measurement in deep space orbits [1] Group 1: Technological Achievements - "Tiandu-1" has successfully conducted the world's first lunar laser ranging test during the daytime, overcoming challenges posed by strong solar light interference [1] - The test involved precise tracking and signal capture of weak satellite echo signals, which are typically difficult to identify due to background noise during the day [1] - This advancement expands the observational window for laser ranging technology, supporting major deep space exploration projects such as the International Lunar Research Station [1] Group 2: Mission Details - "Tiandu-1" was launched in March 2024 alongside the "Qiao Qiao-2" satellite, with its core mission focused on validating new communication and navigation technologies for future lunar communication and navigation constellation systems [1] - The satellite has already completed multiple new technology tests in orbit, demonstrating its capabilities and contributions to the field [1]