Low-orbit satellite-borne GNSS precise orbit determination method and system based on inter-position dynamics constraint

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: 2020-12-25
WUHAN UNIV
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[0010] This patent is mainly aimed at real-time orbit determination of low-orbit satellites based

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  • Low-orbit satellite-borne GNSS precise orbit determination method and system based on inter-position dynamics constraint
  • Low-orbit satellite-borne GNSS precise orbit determination method and system based on inter-position dynamics constraint
  • Low-orbit satellite-borne GNSS precise orbit determination method and system based on inter-position dynamics constraint

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[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-borne GNSS precise orbit determination method and system based on inter-position dynamic constraints. The method comprises the steps of obtaining GNSS precise ephemeris, a clock difference file, low-orbit satellite attitude data and satellite-borne GNSS observation data, obtaining a low-orbit satellite orbit pseudo-range solution, calculating the inter-position dynamic constraints of a low-orbit satellite, and calculating an approximate low-orbit satellite prior orbit; and performing data editing on satellite-borne GNSS observation data, establishing an orbit determination observation model and a random model in combination with dynamic constraints, and resolving a low-orbit satellite precision orbit to realize satellite-borne GNSS precision orbit determination of the low-orbit satellite. According to the method, the error model of the orbit dynamics model is adopted to consider the influence of the error on orbit determination, a complexhigh-precision satellite orbit dynamics model is not needed while the orbit determination precision is ensured, and unknown dynamics parameters or pseudo-random parameters do not need to be estimated;the orbit integral arc section is short, and the calculation efficiency is relatively high; and GNSS observation data with unequal sampling intervals can be processed, and the method is very suitablefor 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...

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Application Information

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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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