Design method of earth observation track in same period as earth nutation
It is a technology of earth observation and design method, which is applied in design optimization/simulation, calculation, special data processing application, etc. It can solve problems such as large variation, interference of observation data, and adverse effects of observation tasks, so as to reduce variation and improve Observation accuracy and implementation effect are outstanding
Active Publication Date: 2017-09-22
西安蓝岸新科技股份有限公司
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In the three-body gravitational field, when the position of the spacecraft on the floating orbit relative to the earth is a stationary point in space, the angle between its line of sight changes greatly. It will be disturbed by movement, which will adversely affect the observation task
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[0038] see Figure 2-a , Figure 2-b , the earth nutation equiperiod earth observation orbit design method of the present invention comprises the following steps:
[0039] Step 1: Solve the mass parameters of the virtual celestial body in the virtual gravitational field; assume that the mass of the sun is M s , the mass of the earth is M E . The mass of the virtual earth in the virtual gravitational field is M VE , the mass of the spacecraft is m. The position vector of the spacecraft in the rotating coordinate system is The distance from the center of the sun is The distance from the center of the earth is The distance between the public center of mass and the heliocentric of the sun and earth in the rotating coordinate system is l 1 , the distance from the center of the earth is l 2 . The distance between the center of the virtual gravitational field and the center of the sun is l V1 , the distance from the center of the earth is l V2 . The position of the vi...
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The invention relates to a design method of an earth observation track in the same period as earth nutation. The method comprises the following steps that 1) a rotation angular velocity of an observation object is given, and a virtual celestial-body mass parameter of a virtual gravity field is solved according to certain formula; 2) the relation between a position parameter of a virtual celestial body and a position parameter in a practical three-body gravity field is solved; and 3) according to an obtained parameter of the earth observation track, a thrust acceleration needed to realize the earth observation track is solved. According to the invention, the virtual three-body gravity field is used to realize the suspension track whose period is the same with that of revolution of the earth, and change of an observation visual angle is reduced; and the period of the earth observation suspension track is equivalent to that of earth nutation, the earth is in winter when an aircraft is in the highest point and the earth is in summer when the aircraft is in the lowest point, thus, the visual angle of an observation task fluctuates narrowly, and the observation precision is improved.
Description
technical field [0001] The invention relates to the field of earth observation by spacecraft, in particular to a method for designing an earth observation orbit with equal periods of earth nutation. Background technique [0002] The high-resolution earth observation system is not only a major infrastructure related to national security, economic construction and social development, but also has huge market value and can promote the transformation and development of my country's economy. The observation accuracy of earth observation is related to the performance of the load and the observation object. On the basis of a certain load performance, improving the observation environment can improve the observation accuracy. In the Earth's polar observation mission, due to the precession of the Earth's axis, the angle of the Earth's polar observation by the spacecraft in the suspended orbit will change greatly, as shown in Figure 1. When it is winter, the position of the Earth's ...
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Login to View More IPC IPC(8): G05B17/02G06F17/50
CPCG05B17/02G06F30/20
Inventor 袁建平孙冲赵俊峰袁源朱战霞程潏高琛
Owner 西安蓝岸新科技股份有限公司