Geomagnetic total element sensor attitude error correction method

Abstract

The invention provides a geomagnetic total element sensor attitude error correction method, comprising: S1, measuring a geomagnetic total element sensor attitude deflection angle [alpha] and a measurement point geomagnetic field F; S2, sequentially feeding equal current in opposite directions to a first coil C1, respectively measuring deflection magnetic fields FI+ and FI-; S3, sequentially feeding equal current in opposite directions to a second coil C2, respectively, and respectively measuring the deflection magnetic fields FD+ and FD-; S4, calculating a variation correction value [delta]I'1of a magnetic inclination and a variation correction value [delta]D'1 of a magnetic declination; S5, calculating a magnetic inclination correction value I and a magnetic declination correction valueD, and a correction formula being I=I0+[delta]I'1, D=D0+[delta]D'1. The method has beneficial effects that a problem of low measurement accuracy caused by attitude changes in measurement of a geomagnetic total element sensor, so that the geomagnetic total element sensor can be applied in the fields of marine, aviation, and terrestrial measurement when attitude changes.

Description

technical field [0001] The invention relates to the field of magnetic field measurement, in particular to a method for correcting attitude errors of geomagnetic all-element sensors. Background technique [0002] Please refer to Figure 9 , the geomagnetic field is a vector field, which is composed of seven elements: the total field T, the horizontal component H, the northward component X, the eastward component Y, the vertical component Z, the magnetic inclination I, and the magnetic declination D. Compared with the traditional total geomagnetic field observation and three-component observation, the geomagnetic total element contains more magnetic field information, which can accurately reflect the characteristics of the research object. In practical applications, appropriate magnetic field parameters need to be selected according to different scenarios. In addition, geomagnetic element data can be used for the drawing of geomagnetic maps, the study of paleomagnetism, and t...

AI Technical Summary

Problems solved by technology

Vector sensors are mainly divided into three categories: the first category is represented by fluxgate sensors, which are small in size and can directly obtain geomagnetic three-component information, but there are orthogonality errors, temperature drift, and the inability to perform absolute observations, etc. Problem; the second type is the combined measurement method of fluxgate sensor and theodolite. This type of magnetometer is also called DI instrument. It directly reads the geomagnetic inclination and declination through the optical system of theodolite, but it cannot perform automatic observation.

The third category is the combined measurement method combining the total field sensor and the Helmholtz coil (uniform magnetic field generator), mainly including FHD, three-axis coil method, ZHD and other methods. This type of sensor is mostly used for the observation of geomagnetic stations. In the case of ocean, aviation, and land attitude changes, the accuracy of the measurement value will be problematic due to attitude changes, which limits its application in ocean, aviation, and land attitude changes.

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