Spacecraft attitude determination method utilizing same-beam interferometric measurement of ground measurement station

Abstract

The invention belongs to the field of spacecraft attitude determination and radio interferometric measurement and relates to a spacecraft attitude determination method utilizing same-beam interferometric measurement of a ground measurement station. The method includes the steps that different satellite-borne transmitting antennae of a same spacecraft carry out same-beam interferometric measurement so that the distance differences between the different satellite-borne transmitting antennae of the same spacecraft and different ground receiving antennae can be acquired; on the basis of the distance differences, the attitude information of the spacecraft is resolved. According to the method, same-beam interferometric measurement is performed on downlink signals of the spacecraft, the accurate distance differences between the satellite-borne transmitting antennae and the ground receiving antennae are acquired, and therefore the attitude information of the spacecraft is resolved. The ground receiving antennae are utilized, and compared with an existing measurement method based on a satellite-borne device, reliability is high; besides, interferometric measurement is implemented through the ground measurement station, fault maintaining performance is good, and the risk that a whole satellite loses efficiency because of attitude measurement failure of the satellite-borne device is eliminated.

Description

technical field [0001] The invention belongs to the fields of spacecraft attitude measurement and radio interferometry, and relates to a spacecraft attitude measurement method using ground station same-beam interferometry. Background technique [0002] In-orbit spacecraft have specific missions, and have clear requirements for flight attitude and accuracy during flight. The analysis of existing literature shows that the orbital attitude change of spacecraft has a great influence on the imaging effect of spaceborne synthetic aperture radar (SAR). Under certain imaging conditions, the three-axis attitude change of the spacecraft must meet the corresponding accuracy index, so that it is possible to achieve the established SAR imaging accuracy. The communication spacecraft needs to always point the spaceborne transmitting antenna to the ground receiving antenna based on the attitude information. Moreover, with the development of my country's aerospace and communication industr...

AI Technical Summary

Problems solved by technology

However, the star sensor has complex structure, large volume, high power consumption and high price

Regardless of the laser gyroscope, star sensor, or sun sensor, they are all space-borne equipment. Once a failure occurs, it is difficult to repair, and even cause the entire star to fail.

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