On June 17, my country's Shenzhou 12 manned spacecraft was successfully launched. Five years later, the Shenzhou 12
manned spacecraft took astronauts into space, achieving five firsts.
First implementation of autonomous rapid rendezvous and docking of manned spacecraft
The Shenzhou 12 manned spacecraft developed by the Fifth Academy of Aerospace Science and Technology Group will
implement the manned autonomous rapid rendezvous and docking for the first time. With the continuous adjustment of 
the attitude of the space station, the Shenzhou 12 manned spacecraft will be able to achieve 6.5 after launch Hour docking
with the space station.
According to Gao Xu, the deputy chief designer of the Shenzhou 12 manned spacecraft system, Shenzhou 12 is like a 
"supercar" with a fully automatic driving function, autonomously calculating, and autonomously judging to reach the 
destination. orbited the space station for the first time and intersected radially with the space station
In this mission, the Shenzhou XII manned spacecraft’s rendezvous capabilities have been enhanced, with more complex 
rendezvous and docking flight modes, and the functions of forward, backward, and radial docking and separation with
 the space station. For the first time in this mission, a round flight and radial rendezvous and docking test was carried 
out.
Realize long-term on-orbit docking for the first time
The Shenzhou 12 manned spacecraft will be docked in orbit for 3 months. In order to adapt to the complicated external
 heat flow conditions brought about by the complex configuration and attitude of the space station, the Shenzhou team
 has carried out special design for the thermal control schemes of the return cabin, propulsion engine and storage tank, 
and the grid-connected power supply scheme of the ship station, so that the spacecraft has power supply and heat. 
Adaptable supporting conditions for environmental protection.
Gao Xu used the game skill vividly to make an analogy, "We are now full of skill points for the first time, and there is no 
problem with the spacecraft docking for 3 months."
 For the first time, it has the ability to return to the Dongfeng landing site from different altitude orbits
Before Shenzhou 12, the manned spacecraft returned to Earth from a fixed orbit. In the space station mission, in order to 
save the consumption of propellant, the orbit position of the space station will be adjusted accordingly at different time 
nodes to meet the requirements of long-term docking.
The Shenzhou team re-adapted the design of the return orbit, adjusted the return height of the manned spacecraft from 
a fixed value to a relative range, and improved the return algorithm to improve the return adaptability and reliability of 
the manned spacecraft.
 For the first time, it has the emergency rescue capability combining heaven and earth with multiple guarantees
"Manned spaceflight, human life shuts down the sky" has always been the supreme creed in the hearts of the Shenzhou
 team. In order to ensure that the sky and the ground have the ability to protect the lives of astronauts and retrieve them
 under emergency conditions, the Shenzhou team created an emergency rescue that combines heaven and earth. The
 mission mode, that is, carrying two spacecraft into the field, with one ship as the backup of the launching ship, will 
become the life rescue boat for astronauts in emergencies.
The Shenzhou team adopts a "rolling standby" strategy. When the first manned spacecraft is launched, the next manned 
spacecraft is on standby at the launch site and has an emergency launch capability of 8.5 days to ensure that space 
rescue can be achieved..