Coordinated control method for formation flying of electric sail spacecraft on heliocentric suspension orbit
A formation flight and cooperative control technology, applied in the aerospace field, can solve problems such as mission failure, easy to be cut off, limited observation range, etc., and achieve the effect of improving control accuracy
Inactive Publication Date: 2019-01-15
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
However, considering the complexity of the structure, technology and manufacture of the electric sail itself (a single metal chain is composed of 25 micron ultra-thin cables, which are easily cut off, and the reliability has not been guaranteed at present), the launch cost of the electric sail is high and the risk of failure The failure of a large or certain subsystem function module can lead to the failure of the entire task
In addition, a single electric sail has a limited observation range after all, and some near-Earth asteroids or scientific missions (Mercury's magnetic field) require multi-angle, high-resolution tracking. Therefore, it is necessary to use electric sails for formation flight
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[0051] The present invention will be further described below in conjunction with the accompanying drawings.
[0052] 1. Performance analysis of electric sail spacecraft on heliocentric suspension orbit;
[0053] The thrust acceleration of the electric sail is expressed as
[0054]
[0055] in, is the characteristic acceleration, is the distance between the sun and the earth, r is the distance between the sun and the electric sail, such as figure 1 as shown, represents the sun-electric sail unit vector, is the normal unit vector of the sail surface, is the cone angle, α is the thrust angle, and k is the dimensionless thrust acceleration coefficient. The thrust vector model shows that the thrust angle α and the coefficient k are the cone angle α n The 6th degree equation:
[0056]
[0057]
[0058] Among them, the coefficient b 0 ,...,b 6 , c 0 ,...,c 6 Obtained by interpolation and fitting of experimental data;
[0059] Such as figure 2 As shown, the d...
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The invention discloses a coordinated control method for formation flying of an electric sail spacecraft on a heliocentric suspension orbit, wherein a multi-electric sail formation flight near the heliocentric suspension orbit based on the theory of salience fully utilizes communication interaction between spacecrafts, and each electric sail relies on information perception of neighboring membersto update their status. Compared with the traditional master-slave formation control method, the distributed cooperative control strategy can not only avoid the single point of failure of the main spacecraft to enhance the robustness of the system, but also realize the state of the whole group in the maneuvering process. In addition, the introduction of redundant state information also improves the control accuracy.
Description
technical field [0001] The invention belongs to the field of aerospace technology, and in particular relates to a coordinated control method for formation flight of electric sail spacecraft on a heliocentric suspension orbit. Background technique [0002] In recent years, the research focus in the field of aerospace has gradually shifted from near-Earth space to vast deep space. Finding an efficient "interstellar travel" method is the prerequisite and the most critical part of completing the mission. Early deep space exploration used chemical fuel rocket engines, resulting in long flight times and high costs for deep space exploration, so that many mission concepts were technically unrealizable or economically unaffordable. Subsequently, a variety of propulsion systems based on new propulsion methods have been proposed, such as electric propulsion, ion propulsion and nuclear propulsion systems. These propulsion systems are mostly characterized by continuous small thrust, an...
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IPC IPC(8): G05D1/10
CPCG05D1/10
Inventor 袁建平王伟袁静张军华李琪高琛
Owner NORTHWESTERN POLYTECHNICAL UNIV