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There are as many as 100 changes in the technical status of Shenzhou-8, involving spacecraft systems, propulsion modules, in-cabin and extravehicular cameras, power subsystems, overall circuits, etc.
Ship System: The return-to-chair embodies the green concept.
There are many differences between the two ship systems. First of all, the orbital module of Shenzhou 7 is a combination of a living module and an airlock module, which can be described as a dual-purpose cabin - according to its function of supporting astronauts' space life, it is called the orbital module, and according to its function of supporting astronauts' out-of-cabin activities, it is called an airlock cabin. Shenzhou-8, on the other hand, does not have an airlock cabin.
Judging from the shape of the return capsule, the "Shen VIII" is the same as the "Shen VII", but the "Shen VIII" has an additional measurement sensor.
One of the major features of Shenzhou 8 is the return chair, which reflects the designer's green concept. There is a pressure gas drum under the seat of the spacecraft, and if the gas leaks, the consequences are unimaginable. As a result, the "Shen VIII" eventually replaced the gas with compressed air, and added a set of air source component system as a power source, which means that even if a leak occurs, it will not have any adverse effects on the astronaut's body.
In addition, the impact of the astronauts when the spacecraft returns is very large, and in order to make the astronauts feel more comfortable when landing, the designers have also modified the chair of the "Shen VIII" accordingly.
The Shenzhou-8 spacecraft can not only move forward, but also have a translation function. This is also one of its highlights.
Propulsion Module: 12 additional generators.
Compared with the "Shen VII", the "Shen VIII" has added and improved a large number of equipment, which are of different sizes and weights.
First, the functions are different, so you can't simply pretend to be a thing.
In the design, the overall unit of the propulsion module should not only take into account the center of gravity and balance of the capsule during space flight, but also be installed in a suitable position according to the size of the product, and at the same time consider the convenience of operation and maintenance of the operator during installation. After comprehensive consideration, the researchers made a scientific and reasonable overall design plan for the propulsion module, and the safety debugging was in place in one step to ensure the completion of the "Shen VIII" mission.
In terms of power supply capacity, the "Shen VIII" has 12 more generators than the "Shen VII", and the power supply capacity has been greatly enhanced. In terms of function, the "Divine Eight" has added the ability to rendezvous and dock.
Extravehicular camera: Remarkable image processing capabilities.
How can the glorious moment of the rendezvous and docking of Shenzhou-8 and "Tiangong" be quickly transmitted to the world? The TT&C and communication subsystem of the Shenzhou-8 spacecraft solves this problem.
After research, the system adopts the spread spectrum communication scheme, and through a large number of experiments and explorations, the appropriate parameters are selected, and finally a good communication environment is obtained.
The extravehicular camera of the "Shen VIII" can be controlled by astronauts, and the image processing capability is much higher than that of the "Shen VII". In order to meet the requirements of spacecraft users, the subsystem adopts an advanced compression and coding system and a dual-channel image transmission mode, which greatly improves the quality of image transmission and ensures that the picture can be clearly transmitted back to the ground, so that people all over the world can see this feat of China's aerospace.
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