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en:mag_subsys [2017/12/01 13:42]
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en:mag_subsys [2017/12/01 13:43]
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 Designing spacecrafts operating in low orbits a magnetometer is used as one of the devices for determining the orientation (usually added to solar sensors). The magnetometer measures magnetic field around itself and gives out three components of the magnetic field induction vector. Unit of measurement is Tesla. Under ideal conditions the magnetometer on board the satellite measures the geomagnetic field of the Earth - the thing that causes the compass needle to rotate on the ground user. However, in real life, the construction of any satellite contains magnetic materials (for example, permanent magnets of electric drives), so the magnetometer measures a certain total field of the Earth and the field of the satellite itself - the so-called superposition of fields. Designing spacecrafts operating in low orbits a magnetometer is used as one of the devices for determining the orientation (usually added to solar sensors). The magnetometer measures magnetic field around itself and gives out three components of the magnetic field induction vector. Unit of measurement is Tesla. Under ideal conditions the magnetometer on board the satellite measures the geomagnetic field of the Earth - the thing that causes the compass needle to rotate on the ground user. However, in real life, the construction of any satellite contains magnetic materials (for example, permanent magnets of electric drives), so the magnetometer measures a certain total field of the Earth and the field of the satellite itself - the so-called superposition of fields.
  
-The magnetic field of the Earth is well researched, and not only at the surface of the Earth but also in near-Earth space. Although there are some distinctions in its behavior and many not fully explored interesting effects... But this is science. To determine satellite orientation according to the magnetometer readings it is enough to use the accurate mathematical model of the magnetic field, for exampleIGRF, which can be laid on the satellite in the form of program code.+The magnetic field of the Earth is well researched, and not only at the surface of the Earth but also in near-Earth space. Although there are some distinctions in its behavior and many not fully explored interesting effects... But this is science. To determine satellite orientation according to the magnetometer readings it is enough to use the accurate mathematical model of the magnetic field, for example IGRF, which can be laid on the satellite in the form of program code.
 .{{ ::​earth_mag_field.jpg?​200|}} .{{ ::​earth_mag_field.jpg?​200|}}
 Comparison of magnetometer readings with the calculated values according to the geomagnetic field model makes it possible to estimate the orientation (and in some cases the position) of the spacecraft in space. When carrying out experiments with a "​satellite"​ in the laboratory, it is proposed to use a magnetometer as an instrument both for determining the orientation and for determining the position of the satellite in "​orbit",​ i.e. for navigation. In this case special laboratory equipment creates the "​geomagnetic"​ field, measured by a magnetometer on board. It is controlled from the computer according to a predetermined control law. Comparison of magnetometer readings with the calculated values according to the geomagnetic field model makes it possible to estimate the orientation (and in some cases the position) of the spacecraft in space. When carrying out experiments with a "​satellite"​ in the laboratory, it is proposed to use a magnetometer as an instrument both for determining the orientation and for determining the position of the satellite in "​orbit",​ i.e. for navigation. In this case special laboratory equipment creates the "​geomagnetic"​ field, measured by a magnetometer on board. It is controlled from the computer according to a predetermined control law.
en/mag_subsys.txt · Last modified: 2020/03/25 16:28 (external edit)