The reporter learned on the 1st from the 502 Institute of China Aerospace Science and Technology Corporation No. 5 that China's "Tianqin-1" satellite successfully achieved "towing-free control" based on the micro-null variable thrust air-conditioning propulsion technology.
In layman's terms, the "no-drag control" of a satellite refers to the ability to resist all interference satellites except gravity. Satellites fly in the sky, and the interference force they receive mainly comes from atmospheric resistance, sunlight pressure, etc. To remove these interference forces, the satellite can become a "super-static and ultra-stable" platform and make space gravitational wave detection possible. The micro-null variable thrust technology is the premise of implementing no-drag control, and is also an important direction for the development of space propulsion technology.
On the 1st, the researchers again analyzed the on-orbit data of the "Tianqin-1" satellite micro-null propulsion system, and the results showed that the main technical parameters reached the international advanced level. This is the first time that China has completed the on-orbit verification of the micro-null variable thrust air-conditioning propulsion technology, marking that China has become the second country in the world to master the technology, and it has also taken a substantial and crucial step in space gravitational wave detection. .
Where is this technology cattle?
The Long March V launch vehicle launched recently has great strength. While the micro-cow advancement, the cow is in its "micro", even if the thrust generated by a yawn is many times greater than it. According to 502 experts, the force of 1 micro-newton is approximately equal to the weight of 1 centimeter of hair, and the resolution accuracy of the "Tianqin One" micro-new-class propulsion system is 0.1 micronew, which means that it can be equivalent to 1 millimeter of hair. The unit of weight is to adjust the thrust.
Micro cow level continuous variable thrust module products. Photo courtesy of 502 in the fifth academy of China Aerospace Science and Technology Corporation
This weak thrust is to continue to offset the interference of the solar pressure and the atmosphere on the satellite. Because these interference forces will produce extremely weak changes with environmental changes, the system is required to provide extremely small and precise thrust while achieving extremely accurate continuous adjustment. According to reports, the "Tianqin No. 1" micro-propulsion system can accurately control only 1 ml of gas at a constant speed for 1 hour, and the spool stroke that controls the flow rate is only a few tens of nanometers.
"Tianqin No. 1" technical test satellite development site. Photo courtesy of China Aerospace Science and Technology Corporation
It is understood that the 502 Institute developed China's first-generation cold air propulsion system as early as the 1970s and realized on-orbit applications. With the development of various types of space propulsion systems, the air-conditioning propulsion system once faded from the stage of history. However, due to its advantages of stable thrust, high thrust resolution, low noise, continuous easy adjustment, and large thrust range, it has been subjected to a new generation of space basic physical science exploration tasks, high-precision gravity field measurement tasks, and high-precision ground observations. And the favor of space missions such as satellite navigation. The unified requirements of these tasks on the satellite platform are "ultra-static low-noise, ultra-high precision, ultra-high stability", for which, the cold air propulsion system is currently the best choice.
The "Tianqin-1" satellite is the first technical verification satellite of China's "Tianqin" gravitational wave detection program, which was launched on December 20, 2019. (Liu Xuhui Xue Yingmin Technology Daily reporter Fu Yifei)
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