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Solutions to magnetic interference and magnetic residual interference of electronic compasses
First, let's understand what magnetic interference and magnetic residual interference of electronic compasses are.
Magnetic interference refers to the situation where the electronic compass is in a non-uniform magnetic field environment. Generally, the geomagnetic field at a certain location on Earth is relatively uniform (the magnetic components have the same magnitude and direction). However, due to the presence of certain interfering substances around it, such as motors, magnets, ferromagnetic materials, mobile phones, and large currents (which generate magnetic fields), another magnetic field is superimposed in the space, changing the magnitude and direction of the original magnetic field, thus making the azimuth angle output by the electronic compass inaccurate. The electronic compass developed and produced by Msensor Sensors effectively solves the problem of magnetic interference. We propose three methods to address magnetic interference: physical method, hardware method, and software method, and the order of these three methods cannot be reversed.
The physical method refers to users avoiding and staying away from magnetic interference substances when using the electronic compass; the hardware method refers to reasonable and complete PCB layout and optimizing component selection; the software method refers to magnetic calibration, allowing the electronic compass to learn about the surrounding magnetic field environment and applying it to the azimuth angle calculation process, compensating for the interference magnetic field information, so that even with magnetic interference, it can accurately output the azimuth angle after compensation. Huilian Technology has five magnetic calibration methods, which will not be discussed in detail here.
The prerequisite for the occurrence of magnetic residual interference is that magnetic interference has already occurred; both magnetic interference and magnetic residual interference are necessary conditions. Generally, after magnetic interference occurs, as long as the interfering substance is away from the electronic compass, its azimuth angle data will return to the original data. However, an irreversible phenomenon may occur, where after the interference is removed, the electronic compass cannot return to the original data. This phenomenon is called magnetic residual interference, which means that there is a residual magnetic field present on the electronic compass.
The methods to avoid magnetic residual interference are the same as those to avoid magnetic interference.
If magnetic residual interference does occur, there are two methods to handle it: the first method is the Curie temperature, and the second method is time decay, which generally takes several months or even longer.
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