Interference compensation method and device of geomagnetic sensor

A geomagnetic sensor and interference compensation technology, applied in the field of communication, can solve problems such as the difficulty of avoiding geomagnetic sensor interference, and achieve the effect of accurate geomagnetic three-axis data and rich experience effects

Active Publication Date: 2016-01-27
ZTE CORP
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Problems solved by technology

The magnetic field generated by the changing current cannot be avoided by fixed compensation, so the geomagnetic sensor in the mobile phone will be placed away from the power line. For example, the safe distance of the 1A (ampere) power line is 1000 (mA )/10=100(mm); under the development trend of mobile phone mo...

Method used

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  • Interference compensation method and device of geomagnetic sensor
  • Interference compensation method and device of geomagnetic sensor
  • Interference compensation method and device of geomagnetic sensor

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Embodiment 1

[0055] image 3 According to the flow chart of establishing the functional relationship between the disturbance current value and the three-axis data of the geomagnetic sensor in Embodiment 1 of the present invention, such as image 3 As shown, establishing a functional relationship includes the following steps:

[0056] Step S302: First, it is necessary to determine the number of current sources that interfere with the geomagnetic sensor. In general, it is necessary to meet the requirements of: safety distance (mm) > current change (mA) / 10. When the layout and wiring around the geomagnetic sensor is determined, the distance between the current trace and the geomagnetism is known, and the current on the power trace can be estimated or predicted. If the requirements of the safety distance are not satisfied, the influence of the power wiring on the geomagnetic sensor needs to be considered;

[0057] Step S304: geomagnetic calibration. The purpose of geomagnetic calibration i...

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Abstract

The invention discloses an interference compensation method and device of a geomagnetic sensor. The method comprise that it is determined that current of a power line interfere in the geomagnetic sensor; current values of the power line are obtained, and a tri-axial data compensation value is obtained according to the functional correspondence between the tri-axial data change value of the geomagnetic sensor and the current values; and the tri-axial data compensation value is subtracted from the present tri-axial data of the geomagnetic sensor. The method and device can be used to solve the problem that interference of the PCB power line in the geomagnetic sensor is hard to avoid, the output geomagnetic tri-axial data is more accurate, and thus abundant experience is provided when the geomagnetic sensor is applied.

Description

technical field [0001] The present invention relates to the communication field, in particular to an interference compensation method and device for a geomagnetic sensor. Background technique [0002] Geomagnetic sensors can realize electronic compass functions, inertial navigation and other applications. With the continuous development of micro-electro-mechanical system (Micro-Electro-Mechanical System, referred to as MEMS) manufacturing technology, processing technology and material technology. The research, manufacture and application of geomagnetic sensors have also reached an unprecedented level. At present, geomagnetic sensors can be divided into planar electronic compass and three-dimensional electronic compass according to the presence or absence of inclination compensation; they can also be divided into magnetoresistive effect sensors, Hall effect sensors and fluxgates according to the different technical principles of detecting geomagnetic distribution changes. s...

Claims

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Application Information

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IPC IPC(8): G01V3/40
CPCG01V3/40
Inventor 卢清
Owner ZTE CORP
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