Autonomous orbit determination method and system for low-orbit satellite constellation

Abstract

The invention discloses an autonomous orbit determination method and system for a low-orbit satellite constellation. The method comprises the following steps: acquiring inter-satellite link ranging data and satellite-borne GNSS receiver observation data; establishing an observation model by using the observation data, and preprocessing the observation data; carrying out on-satellite PPP calculation by utilizing the preprocessed observation data to obtain an on-orbit rough spatial position of each low-orbit satellite; selecting an orbit determination perturbation correction mechanical model to establish a low-orbit satellite dynamic differential equation; establishing an orbit determination function model by combining the observation model; constructing a random model, fusing the orbit determination function model and the random model to establish a joint adjustment model, and obtaining a low-orbit satellite orbit determination result; constructing a low-orbit satellite constellation space network by using inter-satellite link ranging data, obtaining an autonomous orbit determination result of the low-orbit satellite constellation by combining a joint adjustment model, and realizing on-satellite high-precision safe autonomous orbit determination of the low-orbit satellite by directly using the inter-satellite link ranging data and observation data of a GNSS receiver.

Description

technical field [0001] The invention relates to the technical field of satellite orbit determination, in particular to a method and system for autonomous orbit determination of low-orbit satellite constellations. Background technique [0002] With the gradual development and in-depth use of low-orbit satellites in different fields, low-orbit satellites gradually appear in the form of constellations, and in some fields, the demand for orbit determination accuracy of low-orbit satellite orbits is getting higher and higher. At present, the high Precision orbit determination products are produced by various data analysis centers by analyzing the GNSS observations of a large number of ground monitoring stations. However, due to international political factors, geographical factors, and data safety and reliability requirements, it is currently impossible to build a large number of foreign stations. Increased the difficulty of continuous, safe and controllable monitoring of low-orb...

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Problems solved by technology

[0003] The problem to be solved by the present invention is that the number of ground monitoring stations in the prior art is small, and the geographical location of the ground monitoring stations is unevenly distributed, resulting in inaccurate orbit determination of the low-orbit satellite constellation. The present invention provides an autonomous orbit determination of the low-orbit satellite constellation The method and system directly use inter-satellite link data and GNSS receiver observation data to realize high-precision and safe autonomous orbit determination of low-orbit satellites without going through ground monitoring stations

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