Self-calibration geomagnetic sensor circuit

Abstract

The invention discloses a self-calibration geomagnetic sensor circuit. The self-calibration geomagnetic sensor circuit includes a biaxial magnetoresistive sensor, a signal amplification circuit, an AD conversion module, a set and reset circuit, a voltage boosting circuit for providing driving voltage of the set and reset circuit, a reference voltage source which provides reference voltage for the biaxial magnetoresistive sensor and the AD conversion module respectively, an internal microprocessor which provides control signals for the set and reset circuit and the voltage boosting circuit respectively, and a power source conversion module which supplies power for the AD conversion module and the set and reset circuit respectively; the set and reset end of the biaxial magnetoresistive sensor is connected with a corresponding port of the set and reset circuit; and the output end of the biaxial magnetoresistive sensor is connected with an upper computer through the signal amplification circuit and the AD conversion module. With the self-calibration geomagnetic sensor circuit adopted, the detection sensitivity of a geomagnetic sensor can be improved.

Description

technical field [0001] The invention relates to a self-calibrating geomagnetic sensor circuit, which belongs to the technical field of sensors. Background technique [0002] The existing geomagnetic sensors are mainly magneto-sensitive and magneto-resistive. Magneto-resistive sensors are widely used due to their advantages of low cost, high sensitivity, fast response, low power consumption and high reliability, especially in the measurement of weak magnetic fields and based on weak magnetic fields. Magnetoresistive sensors have more significant advantages in geomagnetic navigation, digital intelligent compass, position measurement, etc. In addition, they can also be used to make high-precision rotational speed sensors, angular displacement sensors, etc., in military, industrial, aerospace, and medical equipment. And other instruments and meters have a wide range of applications. However, the technical threshold of detection instruments based on geomagnetic sensors is relati...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a self-calibrating geomagnetic sensor circuit, and solve the technical problems of poor anti-interference ability and low sensitivity of the geomagnetic sensor in the prior art

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