Twin asteroid detection autonomous cooperation optical navigation method

A technology of optical navigation and double asteroids, which is applied in the direction of integrated navigators and navigation calculation tools, etc., which can solve the problems of inaccurate master star and slave star ephemeris, affecting navigation accuracy, and inaccurate slave stars, etc.

Active Publication Date: 2019-08-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0006] In order to solve the problem that the inaccurate ephemeris of the main star and the slave star makes the position of the slave star relative to the main star inaccurate and affects the navigation accuracy during the navigation process of the binary asteroid, the autonomous cooperative optical navigation method for the detection of the binary asteroid disclosed by the present invention is to be solved The technical problem is: using two detectors to observe the main star and the slave star respectively, combined with the distance measurement and angle measurement between the detectors, it is possible to determine the position speed of the two detectors and the position of the slave star relative to the main star, and it has navigation Advantages of high precision

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Embodiment 1

[0065] The double asteroid system 65803 Didymos is selected as the target celestial body, and Table 1 lists various parameters of the double asteroid system 65803 Didymos. The orbits of the binary asteroid around the center of the double asteroid system are in the same plane as the orbit of the double asteroid system around the sun, the resolution of the navigation camera is 500×500 pixels, the field of view is 90°, and the focal length of the navigation camera is is 20mm, and the camera measurement error is 4×10 -3 rad, the inter-satellite ranging error is 0.1m, and the inter-satellite angle measurement error is 1×10 -3 rad. The mass of the detector is constant at 500kg and the maximum cross-sectional area is 20m 2 , and the reflection coefficient is assumed to be 1.

[0066] Table 1 Parameters of the binary asteroid 65803 Didymos

[0067]

[0068] Let the initial position of the detector 1 be the Lagrangian point L4 of the double asteroid system, and the normal vector...

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Abstract

The invention provides a twin asteroid detection autonomous cooperation optical navigation method, which belongs to the field of autonomous navigation. The method provided by the invention comprises the steps that when the position of a main star is known and the position of a slave star is not known, the dynamic equation of detectors is established under the inertial coordinate system of a double-asteroid system; according to the navigation system used by the detectors, the line-of-sight observation model of the main star and the slave star and a ranging angle measurement model between the detectors are established; an unscented Kalman filter for twin asteroid navigation is designed; orbital prediction gives the position and velocity of two detectors and the priori estimate of the position of the slave star as the initial state; the dynamic equation and an observation equation are combined, and the unscented Kalman filter is used for estimating to determine the position and velocity of two detectors and the position of the slave star in real time. According to the invention, the method has the advantages of good real-time performance and high navigation precision; the unscented Kalman filter is used for estimation, which does not need to linearize a nonlinear system, and does not need to calculate a Jacobian matrix; and the method has the advantages of simple implementation and good convergence.

Description

technical field [0001] The invention relates to an autonomous cooperative optical navigation method for binary asteroid detection, which belongs to the field of autonomous navigation. Background technique [0002] Asteroid detection is currently a research hotspot in the field of deep space exploration. Compared with single asteroids, factors such as the irregular gravitational field, spin, and binary star interaction of the double asteroid system lead to more complex dynamics of the double star system, greater difficulty in detection, and higher requirements for the navigation system. Autonomous optical navigation is one of the key technologies to realize the detection of binary asteroids. In order to realize the precise detection of binary asteroids, it is necessary to study the autonomous and precise navigation technology of binary asteroid detectors, which is one of the key issues of current scientific and technological personnel. [0003] Among the two-body asteroid na...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/24G01C21/20
CPCG01C21/20G01C21/24
Inventor 朱圣英刘东宸崔平远徐瑞杜磊梁子璇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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