In March 2015, the first flight of the upper stage of China's expedition 1 was successful. After separation from the rocket, it can continue to "relay" rocket flight and directly send the satellite to the working orbit, which is called "space ferry".
After the rocket takes off, under the control of the control system, it completes program turning, booster falling off, ignition and shutdown of the upper stage rocket, interstage separation and fairing separation, etc; When the rocket reaches the orbit entry point, the payload separates from the rocket and enters the predetermined orbit. At this time, the launch of the launch vehicle is completed.
Extended data
Whether solid launch vehicle or liquid launch vehicle, single-stage launch vehicle or multi-stage launch vehicle, its main components include structural system (also known as rocket body structure), power plant system (also known as propulsion system) and control system. These three systems are called the main system of the launch vehicle. The reliability of the main system will directly affect the success or failure of the launch vehicle flight. In addition, there are some systems on the launch vehicle that do not directly affect the success or failure of flight and are composed of on-board equipment and ground equipment, such as telemetry system, external ballistic measurement system, safety system and aiming system.
Among them, the rocket body structure is the matrix of the launch vehicle. It is used to maintain the shape of the rocket, bear various loads on the launch vehicle during ground transportation, launch operation and flight, install all instruments and equipment connecting each system of the rocket, and connect and combine all systems and components on the rocket into a whole. （HuoJianFenLiDeWaiKeQuLeNa）