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Reveal the "land Probe 1 A star" space autopilot: "time and space revisit" to predict geological disasters

via:中国新闻网     time:2022/1/26 22:02:06     readed:321

On January 26, Beijing time, China successfully launched the Land Probe I 01 Group A satellite (short for: The satellite is equipped with China's first high-precision surface micro-deformation monitoring radar system based on space observation. This is A very picky "passenger". For this, the attitude and Orbit Control subsystem development team of the Eighth Institute of China Aerospace Science and Technology Corporation endowed the satellite with excellent "driving" technology.


On January 26, China successfully launched the Land Probe I 01 group A satellite on A Long March 4C carrier rocket. The picture shows the satellite development data.

Zhang was taken

"Time and Space Revisiting" : The premise of geological disaster prediction

"Land detection 1 01 set A star" satellite, deputy chief designer of Wang Wenyan played an example: "attitude orbit control subsystem is the satellite's driving system, it all depends on how to design 'passengers' personalized requirements, some' passengers' need photographs of the vision of one part of the earth, which requires attitude orbit control subsystem in good time, sufficient stability; Some passengers like to take close-ups, which requires the attitude track control subsystem to be flexible enough to never lose track. The most important requirement for landprobe 01 a-star is to be able to recreate the target with high precision."

"When a satellite is constantly orbiting the Earth, the so-called high-precision 'spacetime revisit' means that after a regression period, the satellite can strictly return to the original target point." Wang wenyan said. She further explained that the constraint of both time and space is an important prerequisite for landprobe I 01 GROUP A satellite to be able to monitor the surface deformation, thus supporting the prediction of geological disasters.

"Space lanes" : Precision spans from kilometers to 100 meters

For conventional near-Earth satellites, the control accuracy of orbit maintenance is usually between several thousand meters and tens of kilometers, while the control accuracy of Landprobe I 01 GROUP A satellite has been improved from kilometer level to 100 meters level, and the constraint conditions have been upgraded from one-dimensional to three-dimensional.

When A satellite flies in space, it actually has A "lane". Affected by various factors, the flight path of landprobe 1, 01 group A will change up and down, and the "lane" formed is like A three-dimensional "pipe".

In order to ensure that the satellite runs within the prescribed "pipeline" without yawing, the attitude and Orbit control sub-system team of the Eighth Institute of China Aerospace Science and Technology Corporation has created an "automatic pilot system" with high-precision pipeline navigation and control as the core, allowing landprobe NO. 01 Group A satellite to run independently and stably.

"We take the target reference orbit as the central axis, and the orbit control precision requirements as the radius of the stretched into a three-dimensional space, shape like a pipe, we want to firmly control the satellite in this pipe space." Du Yaoke, chief designer of the satellite's attitude and orbit control subsystem, said. He said the pipe-navigation technology can accurately calculate the time and space deviation of the satellite's yaw, and then drive the "steering wheel" to keep the satellite in its predetermined space at all times.

According to the report, during repeated observation, the control radius of the orbit pipe of the Landprobe 1 01 group A satellite can be precisely controlled within 350 meters, reaching the international advanced level.

"Autopilot" : set the navigation route without yawing

Innovative development team is presented based on the theory of "virtual formation flight" orbit control scheme, which is the target reference orbit as A "hypothetical" star, let the land detection 1 01 independent set of A star to follow, give satellite "autonomous" ability, and set up A "budget" control strategy, and as far as possible reducing the consumption of spaceborne propellant. According to the introduction, this approach is also an important development trend in the field of long-life application satellites in the future.

To meet the mission requirements, the satellite has been pre-installed with a target reference orbit with a regression accuracy of meters, or "navigation route," to guide the satellite to its predetermined location on time and accurately, said Du Yaoke, the chief designer. The mission of attitude orbit control subsystem is to ensure that the satellite can always steer strictly according to the "navigation route" without yawing under the influence of the real complex space environment through orbit keeping control technology. (after)

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