Interference Compensation Method and Device for 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: 2019-06-11
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 motherboards getting smaller and smaller in size and with more and more complex functions, this condition is difficult to meet
[0006] Aiming at the problem that the interference to the geomagnetic sensor caused by the PCB power wiring in the related art is difficult to avoid, no effective solution has been proposed so far

Method used

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  • Interference Compensation Method and Device for Geomagnetic Sensor
  • Interference Compensation Method and Device for Geomagnetic Sensor
  • Interference Compensation Method and Device for Geomagnetic Sensor

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Experimental program
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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

An interference compensation method for a geomagnetic sensor comprises the following steps: determining that a current on a power supply wire generates interference to the geomagnetic sensor (S102); acquiring multiple current values on the power supply wire, and acquiring a triaxial data compensation value according to a function correspondence between change values of triaxial data of the geomagnetic sensor and the current values (S104); and subtracting the triaxial data compensation value from current triaxial data of the geomagnetic sensor (S106). By means of the method, the problem that it is difficult to avoid interference caused by a power supply wire to a geomagnetic sensor is solved. Also provided is an interference compensation apparatus for a geomagnetic sensor.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/40
CPCG01V3/40
Inventor 卢清
Owner ZTE CORP
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