逐梦九霄 再赴天宫

Core Viewpoint - The successful launch of the Shenzhou-21 manned spacecraft marks a significant advancement in China's space technology, particularly with the implementation of a 3.5-hour autonomous rapid rendezvous and docking process, showcasing innovation in space mission capabilities [2][3]. Group 1: Technological Innovations - The Shenzhou-21 mission challenges the previous docking time of 6.5 hours, aiming for a new record of 3.5 hours, which is a major leap in space technology innovation [2]. - Key technological optimizations include reducing the number of orbits from three to two during the remote guidance phase, shortening the initial distance for close-range guidance, and unifying the optimization of both guidance phases to ensure trajectory safety [2]. - The GNC (Guidance, Navigation, and Control) system can switch between 3.5-hour and 6.5-hour docking modes, enhancing flexibility and emergency response capabilities during missions [3]. Group 2: System Integration and Support - The Shenzhou-21 mission relies on a highly integrated support network composed of various subsystems, including the rocket system, measurement and control, and communication systems [4]. - The Long March 2F rocket underwent nearly 20 technical improvements to ensure precise orbital insertion, which is critical for the success of the rapid docking process [4]. - The communication system, which includes ground stations and the "Tianlian" data relay satellites, ensures reliable tracking and communication, while the docking mechanism is designed to absorb collision energy for precise capture and locking [4]. Group 3: Scientific Research Initiatives - This mission marks the first time that rodents are being raised and studied in China's space station, with four mice selected for experiments to understand their physiological responses to microgravity [5][6]. - The primary goal of studying the mice is to establish a comprehensive experimental system for mammalian space research, focusing on their organ systems' responses to space conditions [6]. - Additional research includes in-situ studies on lithium-ion batteries in space, which will provide critical insights for future missions [6].