A method and system for determining the projected area of a complex-shaped spacecraft
A projected area and determination method technology, applied in geometric CAD, special data processing applications, etc., can solve problems such as the inability to calculate the projected area of spacecraft with complex shapes, and achieve fast calculation speed, good robustness and versatility, and storage requirements low effect
Active Publication Date: 2021-04-13
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology
[0007] The technical problem of the present invention is: to overcome the deficiencies of the prior art, a method and system for determining the projected area of a spacecraft with a complex shape along any direction is proposed, which solves the problem that the projected area of a spacecraft with a complex shape cannot be calculated in the prior art, such as question
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[0070] According to the needs of calculating the projected area of the existing complex-shaped spacecraft, referring to the idea of Monte Carlo technology in statistics, combined with the basic theory of ray and triangle intersection in computational geometry, the present invention proposes a projection of a complex-shaped spacecraft along any direction area calculation method.
[0071] First, construct a cuboid box that just surrounds the outer surface of the spacecraft, and the cuboid has a surface perpendicular to the projection direction; then, determine the bounding rectangle that produces the test particles, the plane where the bounding rectangle is located is perpendicular to the projection direction, and is located upstream of the enclosing box; Thirdly, generate a test particle in the bounding rectangle, give its position coordinates, and track the trajectory of the test particle, and judge whether the trajectory intersects with the triangle unit on the surface of ...
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A method and system for determining the projected area of a complex-shaped spacecraft, drawing on the idea of Monte Carlo technology in statistics, combined with the basic theory of intersection of rays and triangles in computational geometry, develops a method with good robustness and versatility The calculation method of the projected area of the complex shape spacecraft along any direction. First, construct a cuboid box that just surrounds the outer surface of the spacecraft, and the cuboid has a surface perpendicular to the projection direction; then, determine the bounding rectangle that produces the test particles, the plane where the bounding rectangle is located is perpendicular to the projection direction, and is located upstream of the enclosing box; Thirdly, test particles are generated in the bounding rectangle, and their trajectory is tracked to determine whether the trajectory intersects with the surface of the spacecraft. If the trajectory intersects, the number of intersecting test particles is incremented by 1; finally, the previous step is repeated until the total number of test particles is large enough to ensure The calculation results converge, and the projected area of the spacecraft is calculated according to the number of intersecting test particles and the total number of test particles produced.
Description
technical field [0001] The invention relates to a method and system for determining the projected area of a spacecraft with a complex shape, and belongs to the technical field of aircraft aerodynamic characteristic design and attitude track control. Background technique [0002] In recent years, due to the need for accurate measurement of the gravity field and steady-state ocean circulation, spacecraft in ultra-low earth orbit (200-500 km) has gradually shown broad application prospects. However, the prerequisite for accurate measurement of gravity gradient is the aerodynamic Accurate calculation of resistance. The aerodynamic drag is mainly determined by the local atmospheric density, the drag coefficient and the projected area of the satellite along the direction of motion. The local atmospheric density is generally given by the atmospheric model, and the aerodynamic drag coefficient can be consulted in the database. The problem to be solved is to calculate its projec...
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IPC IPC(8): G06F30/15
CPCG06F30/15
Inventor 靳旭红黄飞程晓丽王强俞继军
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS