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Perturbation multi-Gaussian fitting-based space object tracking method

A space target, Gaussian fitting technology, applied in the field of space target tracking based on perturbation multi-Gaussian fitting, can solve problems such as poor tracking accuracy, and achieve the effect of improving tracking accuracy

Active Publication Date: 2017-05-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a space target tracking method based on perturbation multi-Gaussian fitting, to solve the problem of poor tracking accuracy in the prior art due to the presence of strong nonlinear perturbation force coupled with the state

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  • Perturbation multi-Gaussian fitting-based space object tracking method

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Embodiment

[0069] Example: Space Object Tracking

[0070] The space target tracking system model composed of dynamic equation (2) and measurement equation (3) is used as a simulation example of the present invention.

[0071] Assume that the position coordinates of the measuring device (radar) are (0,0,0), and the initial value of the target's true orbital state is x 0 =[4.590×10 6 4.388×10 6 3.228×10 6 -4.612×10 3 5.014×10 2 5.876×10 3 ] T , the initial value of the state filter and its covariance are P 0 =diag(400 2 400 2 400 2 0.8 2 0.8 2 0.8 2 ).

[0072] The simulation parameters are set as follows: the number of multi-sensor systems in the first layer of EM framework is 10, the window length of each EM algorithm used for window measurement is 2, and the number of iterations is 5. The number of mixed multi-Gaussian items in the second layer of EM is 5, and the number of iterations is 10.

[0073]The present invention notices that the perturbation force is ...

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Abstract

The invention discloses a perturbation multi-Gaussian fitting-based space object tracking method which comprises the following steps: perturbation force applied on a space object is modeled as unknown interference coupled with an object state; under a double layer EM framework, perturbation mean value and covariance are fitted via multi-Gaussian distribution; at a first layer EM, combined state estimation and identification of first order moment of perturbation can be realized; at a second layer EM, first and second order moment of perturbation is identified via mixed multi-Gaussian fitting, and space object state estimation and covariance are fed back and corrected in a combined manner via use of the perturbation mean value and covariance through design of a combined correction filter. The method disclosed in the invention can help solve a problem that poor tracking precision is caused due to strong non-linear perturbation force coupled to the state via technologies of the prior art.

Description

technical field [0001] The invention belongs to the technical field of space target tracking, and relates to a space target tracking method based on perturbed multi-Gaussian fitting. Background technique [0002] The research on tracking technology of space objects (including satellites, spacecraft and space debris) is of great significance to national defense construction, economic development, and scientific research. (1) With the vigorous development of aerospace technology and the continuous enhancement of human ability to use space, the strategic position of space in national defense, politics, scientific research and other aspects is also increasing. The level of space utilization and control has become an important criterion to measure the overall strength of a country; (2) With the increasing amount of space junk around the earth, it has seriously threatened the safety of spacecraft, and the tracking and The demand for surveillance is becoming more and more urgent; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/70
CPCG01S13/70
Inventor 王小旭王永刚王子恬宋宝潘泉梁彦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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