Allowable control set construction method for spacecraft orbit transfer

An orbital transfer and construction method technology, applied in the field of spacecraft orbital transfer, can solve problems such as the inability to obtain optimal solutions for multi-stage tasks, and achieve the effects of easy on-orbit real-time calculation, fast acquisition, and reduced calculation time

Active Publication Date: 2021-02-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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Problems solved by technology

[0004] For the problems existing in the existing guidance theory: most of them are only for a single stage, only local optimization can be performed, and the optimal solution for the whole process of multi-stage tasks cannot be obtained

Method used

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  • Allowable control set construction method for spacecraft orbit transfer
  • Allowable control set construction method for spacecraft orbit transfer
  • Allowable control set construction method for spacecraft orbit transfer

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Embodiment

[0035] The initial condition of the given numerical simulation is: lunar gravitational constant μ = 4903km 3 / s 2 , r=1738km, the overall mass of the rescue spacecraft is 3000kg, and its fuel quality factor in the orbital transfer section is μ F1 =0.3, engine specific impulse I sp =350s, the initial orbit is a circular orbit with a height of 120km at i=0, the initial position is located in the lunar latitude and longitude coordinate system (0°N, 100°W), assuming that the mission orbital height is 15km, the rescue cabin used for power descent release The mass is 1000kg, the engine specific impulse I sp2 =300s, fuel quality factor μ F2 = 0.4. The sensor constraint is that the whole speed is less than 3km / s, the safety constraint is that the height of the lunar surface is greater than 0.5km, and the astronauts send a rescue signal at the lunar latitude and longitude coordinate system (10°N, 20°E).

[0036] According to step 1, determine the initial position of the whole miss...

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Abstract

The invention discloses an allowable control set construction method for spacecraft orbit transfer. The method comprises the steps of firstly, obtaining initial and final positions and speeds; obtaining all possible pulse orbit transfer control quantities according to the initial state, and constructing an orbit transfer section allowable control set according to all possible pulse orbit transfercontrol quantities; and constructing an allowable control set of power descending according to the position of the initial point in the power descending section. Each stage of the orbit does not needto be completely calculated once under each condition, so that the calculation time is shortened under the same calculation force, and the on-orbit real-time calculation is easy. The method of constructing the allowable control set is adopted to facilitate offline calculation of multi-stage tasks, and the allowable control set can be used as a plan to realize rapid acquisition of a guidance law inan emergency state.

Description

technical field [0001] The invention relates to spacecraft orbit transfer in the aerospace field, in particular to a method for constructing an allowable control set for spacecraft orbit transfer. Background technique [0002] Emergency rescue on the lunar surface means that when astronauts have accidents or failures on the lunar surface, the rescue spacecraft pre-deployed on the orbit around the moon, through orbit change and orbit descent, soft landing at the point to be rescued to release rescue supplies and repair equipment the process of. The mission is divided into five stages: initial orbit, orbit transfer, mission orbit phase adjustment, power descent and vertical descent. [0003] Ordinary spacecraft orbit transfer only considers the optimal fuel or energy. Zheng Bo obtained the optimal orbit of fuel for spacecraft orbit transfer by using the pseudo-spectral method, while emergency rescue missions on the lunar surface usually require the optimal time, which is more...

Claims

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Application Information

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IPC IPC(8): B64G1/24
CPCB64G1/242B64G1/247
Inventor 党朝辉代洪华赵弘骞周昊张继烨刘培栋
Owner NORTHWESTERN POLYTECHNICAL UNIV
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