GNSS satellite precision orbit determination enhancement method and system based on offset satellite-borne accelerometer

Abstract

The invention provides a GNSS satellite precision orbit determination enhancement method and system based on an offset satellite-borne accelerometer. The offset satellite-borne accelerometer is arranged at a position deviating from the center of mass of a GNSS satellite, and GNSS observation data provided by an IGS tracking station and GNSS satellite offset satellite-borne accelerometer data are selected; data preprocessing is carried out, including gross error detection, GNSS observation data cycle slip detection, model correction and offset satellite-borne accelerometer data reduction, to obtain non-conservative force acceleration at the center of mass of the GNSS satellite; in combination with the calibrated non-conservative force acceleration and a GNSS satellite orbit dynamics model,an orbit integral and variation equation of the GNSS satellite is established; and GNSS satellite orbit initial parameters, GNSS satellite clock correction and satellite-borne accelerometer calibration parameters are solved, and GNSS satellite precision orbit determination is realized. When the method and system are applied, the offset satellite-borne accelerometer is simple and convenient to design and install, the non-conservative force borne by the GNSS satellite can be accurately measured, the problem of inaccurate modeling of complex solar radiation pressure in a traditional method is avoided, and GNSS satellite orbit prediction can be realized.

Description

technical field [0001] The invention belongs to the technical field of precise orbit determination of navigation satellites, and relates to an enhancement scheme for precise orbit determination of GNSS satellites based on offset satellite-borne accelerometers. Background technique [0002] Since the 1970s, GNSS (Global Navigation Satellite System) has been widely used in surveying and mapping, telecommunications, etc. , water conservancy, transportation and national security and many other fields, and gradually play an important role. The precise orbit determination of GNSS satellites is the premise and basis for the development and application of GNSS technology. Only by obtaining high-precision GNSS satellite precise orbits can precise positioning and other applications be developed. The orbits of GNSS satellites are affected by various perturbations. Its orbital dynamics model mainly includes two parts: conservative force and non-conservative force. The conservative fo...

AI Technical Summary

Problems solved by technology

[0004] (1) Solar radiation pressure is too complicated

None of the existing solar radiation pressure models can ideally correct the solar radiation pressure, and it is difficult to improve the accuracy qualitatively

[0005] (2) The setting of the on-board accelerometer has strict requirements on the design of the satellite structure

Due to the complex functional structure of GNSS satellites and the premise that the core functions of GNSS satellites are not affected, it will be difficult for future GNSS satellites to ensure that the on-board accelerometers are set at the center of mass of GNSS satellites, and the corresponding method will be difficult to apply

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