Calibration system and method for non-orthogonal installation matrix of vector magnetometer and star sensor

Abstract

The invention provides an outdoor calibration system and method for a non-orthogonal installation matrix of a vector magnetometer and a star sensor. The system comprises the vector magnetometer, the star sensor, a non-magnetic turntable, data processing equipment, a geomagnetic field monitoring magnetometer, a scalar magnetometer, a GPS receiver and a theodolite. The problem that a non-orthogonalinstallation matrix between a vector magnetometer and a star sensor cannot be accurately obtained outdoors is mainly solved. Under the outdoor conditions of star observation and stable magnetic gradient, the vector magnetometer and the star sensor are installed on a non-magnetic turntable, and an installation matrix between the star sensor and the magnetometer is converted through multiple times of rotation. The system has the characteristics of simple operation and high measurement precision, and can be used in the fields of space magnetic field and gravitational field detection and other scientific test satellites.

Description

technical field [0001] The invention relates to the field of satellites, in particular to an outdoor calibration method for a non-orthogonal installation matrix of a vector magnetometer and a star sensor. Background technique [0002] Geomagnetism is an important part of geophysics and space physics, and it is a bridge connecting solid geophysics and space physics. It is composed of two parts, the basic magnetic field and the changing magnetic field. The basic magnetic field originates from the interior of the earth, and studying its change and origin is one of the important contents of geodynamics research; the changing magnetic field is related to changes in the ionosphere and solar activities. The study of changing magnetic fields is a hot topic in solar-terrestrial physics research. The changes in the magnetic field observed by satellites include a variety of rich information ranging from solar activities, interstellar space, magnetosphere, and ionosphere activities, d...

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Problems solved by technology

[0004] The patent CN 106092106A uses the NED coordinate system as the reference coordinate system. In a zero magnetic environment, the Euler angle relationship between the fluxgate sensor and the NED coordinate system and the Euler angle relationship between the star sensor and the NED coordinate system are obtained by rotation. Angle relationship, and finally get the Euler angle relationship between the star sensor and the fluxgate sensor. During the whole calibration process, the star sensor cannot observe the stars, but it is calibrated with the help of a star simulator, which cannot be sensitive to the magnetic axis of the vector magnetometer and the star. Calibration directly related to the optical axis of the

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