On-orbit calibration method of circular orbit with tangential small thrust based on gnss precise orbit determination

Abstract

The invention provides a tangential low-thrust in-orbit circular orbit calibration method based on (Global Navigation Satellite System) GNSS precise orbit determination. The calibrated tangential thrust F is used for controlling a spacecraft orbit, and the tangential low-thrust in-orbit circular orbit calibration method is characterized by comprising the following steps: measuring by utilizing a GNSS to obtain the spacecraft position information, and performing a Unscented Kalman filtering method to obtain estimated values of spacecraft position and velocity information under a J2000 coordinate system; calculating an instantaneous orbit semi-major axis of a spacecraft according to the estimated values of the spacecraft position and the velocity information; averaging the instantaneous orbit semi-major axis in the orbital nodal period before each measurement moment to obtain the average orbit semi-major axis at the moment; and subtracting the average orbit semi-major axes before and after the action of the tangential thrust of a circular orbit to obtain orbit semi-major axis variation delta a, and calculating the tangential thrust calibration value of the circular orbit according to the delta a. In the calculation process, the GNSS is completely used to obtain the real-time orbital data without data support of a ground station, and the calibration method has accurate and reliable result and simplicity in calculation and is easy to realize.

Description

technical field [0001] The invention relates to an on-orbit calibration method based on GNSS (Global Navigation Satellite System, Global Navigation Satellite System) precision orbit determination, which belongs to the technical field of spacecraft on-orbit calibration. Background technique [0002] The space propulsion system realizes the orbit and attitude control of the spacecraft through thrust. As an advanced space propulsion technology, electric propulsion not only has outstanding features such as high specific impulse, high efficiency, and long life, but also has a remarkable feature that it can generate small thrust to achieve high-precision control of orbit and attitude. Thrust engines using electric propulsion technology have been successfully applied in space systems, and have very broad application prospects in the fields of geosynchronous orbit satellite position maintenance, ultra-static platform drag-free control, and deep space exploration. [0003] In order ...

AI Technical Summary

Problems solved by technology

Constrained by the location and number of ground stations, ground measurement and control cannot achieve high-precision, full-time orbit parameter measurement. Therefore, the accuracy of ground measurement and control is difficult to achieve on-orbit calibration for small thrust

Both of the above two methods cannot guarantee the accuracy of the calibration results, and have relatively large limitations.

Images