Method for improving representation precision of satellite orbit perturbative force model

Abstract

The invention discloses a method for improving representation precision of a satellite orbit perturbative force model. The method comprises the steps that the satellite orbit perturbative force modelis divided into a gravity model, an uncertainty perturbative force model and high-frequency perturbative force noise; a real satellite orbit is divided into three parts; a satellite orbit perturbationdeviation caused by the uncertainty perturbative force model and the high-frequency perturbative force noise is acquired; a wavelet basis function model of the satellite orbit perturbation deviationis established; a satellite orbit perturbation residual error is acquired, and a stationary autoregression time sequence parameter model of the satellite orbit perturbation residual error is established; and parameter identification and precise orbit determination of the satellite orbit perturbative force model are realized. According to the method, by performing classified representation on the satellite orbit perturbative force model, to-be-estimated parameters of the satellite orbit perturbative force model are reduced, and calculation efficiency of orbit determination is improved; and meanwhile, the uncertainty perturbative force model and the high-frequency perturbative force noise in the satellite orbit perturbative force model are effectively identified, the representation precisionof satellite orbit perturbative force is improved, and therefore satellite orbit determination precision is improved.

Description

Technical field [0001] The invention relates to the technical field of satellites, and more specifically to a method for improving the representation accuracy of a satellite orbit perturbation force model. Background technique [0002] Satellite precision orbit determination is a process of obtaining satellite orbit parameters by using a large amount of orbit measurement data, combined with satellite orbit perturbation dynamics models, and by using appropriate nonlinear parameter estimation methods. This process includes three modeling processes: state model construction, observation model construction and estimation model construction. Therefore, the satellite precise orbit determination problem can be summarized as a multi-model multi-structure nonlinear parameter estimation problem. [0003] The state model, the satellite orbit perturbation model, its accuracy directly affects the accuracy of satellite orbit determination. Then, when constructing the satellite state model, due...

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Problems solved by technology

Then, when constructing the satellite state model, due to the complexity of the satellite’s in-orbit environment, the satellite perturbation force model is complex, involves many parameters and has strong randomness and irregularity, and it is difficult to accurately model it. and parameter expression, it is impossible to obtain its strict analytical solution; in addition, complex models will also lead to a large amount of orbit determination calculations, which will affect the accuracy of satellite orbit determination

[0004] For the perturbation force part whose physical model of satellite orbit perturbation force or its parameters cannot be completely determined, the existing methods generally use empirical acceleration to compensate or correct the perturbation force modeling error. For example, the empirical acceleration can be assumed to be a piecewise constant value or a Gauss-Markov stochastic process is used to absorb the satellite orbit perturbation force model error, but the existing satellite orbit perturbation force compensation methods are generally based on artificial experience and assumptions, which will also greatly increase the number of parameters to be estimated, and it is easy to change the equation coefficients of the orbit determination method The properties of the matrix affect the accuracy of satellite orbit determination

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