An energy-optimized autonomous collision avoidance method for spacecraft under multiple constraints
A collision avoidance and energy-optimized technology, applied in the aerospace field, to achieve the effects of high control result accuracy, simple control operation and fuel saving
Inactive Publication Date: 2021-04-20
CHANGCHUN UNIV OF TECH
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[0008] In order to effectively solve the satellite collision problem, the present invention provides an autonomous collision avoidance method with optimal spacecraft energy under multiple constraints
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[0180] The two-body recursive model is used to give the satellite flight trajectory, and the minimum safe distance is set to 300m. When it is less than 300m, an early warning is issued and collision avoidance control is performed. The effectiveness of the designed optimal control avoidance algorithm is verified by two satellite orbital collision simulations. and feasibility.
[0181] Orbit type constraints: Sun-synchronous orbit is required. After the avoidance control is completed, the orbit is still a sun-synchronous orbit or a near-sun-synchronous orbit. If it is a two-body model orbit, there is no requirement;
[0182] Payload constraints: The payload resolution is 1m (@500km), and the upper limit of the allowable resolution is 1.002m, so the allowable orbital height adjustment is not higher than 501km;
[0183] Control strategy constraints: when the avoiding satellite enters the safe range of the target satellite, avoid the orbit of the target satellite with the optimal a...
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An autonomous collision avoidance method with optimal spacecraft energy under multiple constraints relates to the field of aerospace, and effectively solves the satellite collision problem. The invention includes: establishing a satellite kinematic model; establishing a coordinate transformation matrix to map the motion of the satellite in the center of mass coordinate system to the motion in the earth inertial coordinate system; formulating a collision avoidance strategy; calculating the state equation of the satellite under constraints; Spacecraft energy optimization index and Hamiltonian function, calculate the coordination factor; calculate the satellite optimal speed increment and direction under the optimal conditions of spacecraft energy, through the satellite optimal speed increment and direction, avoid the satellite under the optimal conditions. Motion trajectory for collision avoidance. The invention has high control result accuracy, can realize collision avoidance of two or more satellites, has the advantages of fuel saving, simple control operation, etc., and is generally applicable to small satellites, and is especially suitable for short-range satellite collision avoidance.
Description
technical field [0001] The invention relates to the field of aerospace technology, in particular to an autonomous collision avoidance method with optimal energy of a spacecraft under multiple constraints. Background technique [0002] Autonomous collision avoidance is an effective means and method to prevent low-orbit small satellites from colliding. Due to the rapid development of commercial small satellites, the number of small satellites has increased rapidly, increasing the risk factor of collisions, and the number of measurement and control stations is limited. If several satellites simultaneously Collisions are almost impossible to avoid while only passing through the ground. [0003] At present, the existing satellite autonomous collision avoidance methods mainly include the following methods: [0004] "Spacecraft On-orbit Anti-Collision Autonomous Avoidance Strategy" (Journal of National University of Defense Technology, Yao Dangnai, Wang Zhenguo, 2012, 6(34): 100-1...
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IPC IPC(8): G05D1/08
CPCB64G1/244
Inventor 王国刚刘克平戴路范林东李峰胡建龙孟德利
Owner CHANGCHUN UNIV OF TECH