? ?? ?? ?？ Reporters from China Aerospace Science and Technology Group, the Fifth Hospital 502 learned, based on micro-Niu-grade thrust cold-conditioning propulsion technology, China's "Tianqin 1" satellite successfully achieved" no towing control.
? ?? ?? ?？ Generally speaking, a satellite's "no towing control" refers to the force that eliminates any interference with the satellite other than gravity. Satellite flying in the sky, its interference force mainly comes from the atmospheric resistance, solar light pressure and so on, remove these interference forces, then the satellite can become a "super-static" platform, so that the space gravitational wave detection can be possible. The technology of micro-Niu grade variable thrust is the premise of implementing no towing control, and it is also an important direction for the development of space propulsion technology.
? ?? ?? ?? On the 1st, researchers once again analyzed the orbit data of the \"tianqin 1\" satellite micro cow propulsion system, and the results show that the main technical parameters have reached the international advanced level. This is the first time that our country has completed the in-orbit verification of micro cow grade variable thrust air-conditioning propulsion technology, which indicates that our country has become the second country in the world to master the technology, and also makes the space gravitational wave detection take a substantial and critical step.
? ?? ?? ?？ Where is the technical cow? Recently launched Long March 5 launch vehicle, cattle in the strength. And the micro cow class pushes, the cow in its "micro ", even if a yawn produces thrust many times more than it does. According to 502 experts, the force of a micro cow is about equal to the weight of a 1cm hair, while the resolution accuracy of the "tianqin 1" micro cow propulsion system is micro cow, that is, it can adjust the thrust in units equal to the weight of a 1mm hair.
? ?? ?? ?？ Such a weak thrust is to continue to offset the sun's light pressure and atmospheric interference with the satellite. Because these interference forces will produce extremely weak changes as the environment changes, the system is required to achieve extremely accurate continuous regulation while providing minimal and extremely accurate thrust. According to the "tianqin 1" micro propulsion system can accurately control the 1 hour uniform emission of only 1 ml of gas, while the flow control of the spool travel only a few tens of nanometers.
? ?? ?? ?？ It is understood that 502 as early as the 1970s to develop China's first-generation air-conditioning propulsion system, and to achieve in-orbit applications. With the development of various types of space propulsion system, the cold-conditioning propulsion system has once faded out of the historical stage. However, because it has the advantages of stable thrust, high thrust resolution, low noise, continuous easy adjustment and large range of variable thrust, it has been favored by the new generation of space-based physical science detection mission, high-precision gravity field measurement mission and high-precision space mission such as ground observation and satellite navigation. The unified requirements of these missions for the satellite platform are "ultra-static low noise, ultra-high precision, ultra-high stability ", for which, the air-conditioning propulsion system is the best choice at present.
? ?? ?? ?？ The "Tianqin-1" satellite, the first technical verification satellite of our country's" Tianqin "gravitational wave detection program, was launched on December 20,2019. (Xuhui Liu? Ying - min Xue? Reporter: