On-site self-calibration method of a deep-sea three-component magnetometer
A three-component, magnetometer technology, applied in the direction of electric/magnetic exploration, instruments, measuring devices, etc., can solve problems such as directional errors
Inactive Publication Date: 2015-10-28
SECOND INST OF OCEANOGRAPHY MNR
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However, in actual use, it is found that regardless of the use of foreign advanced mature products or domestic prototypes, since the structure of the towing body where the deep-sea magnetometer is installed inevitably contains hard and soft magnetic materials, these materials give the geomagnetic field measured by the magnetometer A fixed vector field is attached to the data, resulting in obvious directional errors in actual towing work even for a magnetometer that has been rigorously calibrated in the laboratory stage
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[0127] An on-site self-calibration method for a deep-sea three-component magnetometer, such as Figures 1 to 6 As shown, it consists of the following steps in turn:
[0128] A. Pre-acquisition stage: In the deployment stage of the deep-sea three-component magnetometer, use its own rotation and pitch to collect three-component data at different azimuths; theoretically, the three-dimensional distribution of data is as follows: figure 1 shown. Assuming that the deployment time in the deep-sea work area is more than 60 minutes, and the sampling rate is 1 time / second, at least 3600 sets of data can be obtained. In fact, the three-dimensional distribution of the data at this time is as follows: figure 2 shown.
[0129] B. Self-calibration stage: After the deep-sea three-component magnetometer reaches the bottom of the sea, stop the acquisition stage and start the self-calibration stage. The collected data is used as input, and the algorithm is compiled according to the nonlinear...
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The invention belongs to the technical field of error correction of sea geophysical instruments, and relates to an in-site self correction method for a sea magnetometer, in particular to an in-site self-correction method for a deep-sea three-component magnetometer. The method sequentially consists of the following steps including A, the pre-collection stage, B, the self correction stage, and C, the formula correction. The method provided by the invention aims at solving the problem of direction error of the deep-sea three-component magnetometer, the in-site self correction method for the deep-sea three-component magnetometer is provided, the autorotation of the magnetometer in the in-site distribution process is utilized, and the inherent interference magnetic vector is compensated. The method can be realized in an embedded system of the magnetometer by computer languages, and the effective automatic correction can be realized on the magnetometer in the in-site operation stage in the deep-sea environment. Good application prospects are realized in the technical field of error correction of the sea geophysical instruments.
Description
technical field [0001] The invention belongs to the technical field of error correction of marine geophysical instruments, and relates to an on-site self-calibration method of a marine magnetometer, in particular to an on-site self-correction method of a deep-sea three-component magnetometer. Background technique [0002] Marine magnetometer is an important technical means for the research of marine geology, marine geophysics, marine seismology and other disciplines. Accurate and fast collection of geomagnetic signals, and the use of magnetic anomalies to judge the evolution and distribution of seabed mineral deposits are the main goals of marine magnetometer design. The deep-sea three-component magnetometer can be applied to the deep-sea environment with a water depth of 5000m, and can collect geomagnetic three-component signals, which is of great significance for resource and environmental investigations in the deep sea field. At present, some research institutes and comp...
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IPC IPC(8): G01V3/40
Inventor 唐勇
Owner SECOND INST OF OCEANOGRAPHY MNR