Magnetic azimuth measuring system based on giant magneto-resistance sensor, measurement method and perpendicular compensation method
A giant magnetoresistive sensor and geomagnetic azimuth technology, which is applied in measuring devices, instruments, surveying and navigation, etc., can solve problems such as low resolution, poor dynamic performance, and complex structure of geomagnetic sensitive components
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Embodiment 1
[0044] see figure 1 , the geomagnetic azimuth measurement system based on the giant magnetoresistive sensor consists of a power module (1), a geomagnetic measurement module (2), an attitude measurement module (3), a temperature measurement module (4), a microprocessor (5) and a host computer (6) Composition. The power supply module (1) provides a stable 3.3V power supply for the system; the geomagnetic measurement module (2) includes X-axis, Y-axis and Z-axis giant magnetoresistive sensors and corresponding signal processing circuits on each axis; the attitude measurement The module (3) includes X, Y, Z three-axis acceleration sensors orthogonal to each other; the geomagnetic measurement module (2) is connected to the A / D sampling port of the microprocessor (5); the attitude measurement module (3) and The temperature measurement modules (4) are respectively connected to the digital IO ports of the microprocessor (5); the microprocessor (5) is connected to the host computer (6...
Embodiment 2
[0046] This embodiment is basically the same as Embodiment 1, and the special features are: the power supply module (1) uses a voltage conversion chip 1117; the geomagnetic measurement module (2) uses a three-axis giant magnetoresistive sensor AAH002-02 connected to an RC low-pass Filtering circuit and instrumentation operational amplifier INA118; the attitude measurement module (3) uses a three-axis acceleration sensor ADXL345; the temperature measurement module (4) uses a temperature sensor DSB18B20; the microprocessor (5) uses a microprocessor MSP430F149 , after preprocessing the geomagnetic information, pitch information and temperature information, the geomagnetic azimuth is obtained after processing by the host computer (6).
Embodiment 3
[0048] This measurement method of geomagnetic azimuth based on the giant magnetoresistive sensor adopts the above-mentioned measurement system.
[0049] The geomagnetic azimuth measurement process is as follows: figure 2 as shown, image 3 against figure 2 In step 3 of the azimuth angle calculation, the single value realization process of roll angle and pitch angle is described in detail, Figure 4 against figure 2 The single-valued realization process of the azimuth angle in step 3 of the azimuth angle calculation is described in detail. The specific steps of geomagnetic azimuth measurement in this system are as follows:
[0050] (1) if figure 2 Process 1 system initialization;
[0051] (2) if figure 2 Process 2 collects sensor data. Includes: Geomagnetic Data , attitude data Ax, Ay, Az, temperature data T;
[0052] (3) if figure 2 Process 3 calculates the geomagnetic azimuth, including:
[0053] Such as image 3 Obtain the unique pitch angle of a single...
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