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On-board gnss precision orbit determination method and system for low-orbit satellites with dynamic constraints between positions

A low-orbit satellite and precise orbit determination technology, which is applied in satellite radio beacon positioning systems, radio wave measurement systems, and measurement devices, can solve problems such as the inability to precisely determine the orbit of low-orbit satellites

Active Publication Date: 2021-09-14
WUHAN UNIV
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Problems solved by technology

[0010] This patent is mainly aimed at real-time orbit determination of low-orbit satellites based on spaceborne GNSS data, and cannot be used for precise orbit determination of low-orbit satellites

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  • On-board gnss precision orbit determination method and system for low-orbit satellites with dynamic constraints between positions
  • On-board gnss precision orbit determination method and system for low-orbit satellites with dynamic constraints between positions
  • On-board gnss precision orbit determination method and system for low-orbit satellites with dynamic constraints between positions

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Embodiment Construction

[0069] The specific technical solutions of the present invention will be described below according to the drawings and embodiments.

[0070] The low-orbit satellite spaceborne GNSS precise orbit determination method based on the inter-position dynamic constraints provided by the embodiment of the present invention includes providing the inter-position dynamic constraint equation of the low-orbit satellite For subsequent calculations; Joint LEO satellite inter-position dynamic constraint equation and low orbit satellite orbit pseudorange solution Give rough prior orbits of LEO satellites Used for subsequent calculations; data editing of spaceborne GNSS data, joint edited spaceborne GNSS observation data and dynamic constraints between low-orbit satellite positions Establish a mathematical model for orbit determination of low-orbit satellites, and determine the precise orbit of low-orbit satellites onboard GNSS. The main process is as figure 1 shown.

[0071] The embod...

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Abstract

The invention relates to a low-orbit satellite satellite-borne GNSS precise orbit determination method and system with dynamic constraints between positions, including obtaining GNSS precise ephemeris, clock difference files, low-orbit satellite attitude data and satellite-borne GNSS observation data, and obtaining low-orbit satellites. Satellite orbit pseudo-range solution, calculation of dynamic constraints between low-orbit satellite positions, and approximate prior orbit of low-orbit satellites; data editing of spaceborne GNSS observation data, combined with dynamic constraints to establish orbit-determined observation models and stochastic models, and solve Calculate the precise orbit of low-orbit satellites and realize the precise orbit determination of low-orbit satellites onboard GNSS. The present invention adopts the error model of the orbital dynamics model to consider the influence of its error on orbit determination, and does not need a complex and high-precision satellite orbital dynamics model, and does not need to estimate unknown dynamical parameters or pseudo-random parameters while ensuring the accuracy of orbital determination; The orbit integration arc is short, and the calculation efficiency is relatively high; it can process GNSS observation data with different sampling intervals, and is very suitable for precise orbit determination of low-orbit satellites.

Description

technical field [0001] The invention belongs to the technical field of precise orbit determination of low-orbit satellites, and relates to a GNSS precise orbit determination scheme for low-orbit satellites based on inter-position dynamic constraints. Background technique [0002] Since the Topex / Poseidon (T / P) satellite successfully realized the precise orbit determination of the low-orbit satellite GNSS (Global Navigation Satellite System) in 1982, the low-orbit satellite GNSS precision orbit determination technology has been widely used. It plays an important role in the research fields of the earth's gravity field detection, ocean altimetry, remote sensing map, and land exploration. High-precision low-orbit satellites The precise orbit is the premise and foundation for the successful application of low-orbit satellite missions. At present, the precision orbit determination methods of space-borne GNSS low-orbit satellites include: kinematics method, dynamics method, simpl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/24G01S19/11G01S19/37
CPCG01C21/24G01S19/37G01S19/115
Inventor 魏辉李建成徐新禹邹贤才
Owner WUHAN UNIV
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