Abstract
The magnetic interference field generated by ferromagnetic materials on the carrier decreases measurement precision, which has been a crucial factor limiting the application of three-component magnetic measurement. In this paper, a magnetic compensation method based on the Cuckoo search (CS) algorithm is proposed. The method can be separated into three steps. First, a measurement error model is established, based on which a formula of the absolute error sum will be derived. Then, compensation parameters are estimated using the CS algorithm by minimizing the absolute error sum. Finally, the geomagnetic intensity is calculated using estimates of the compensation parameters and measured data. As the CS algorithm possesses the advantages of insensitivity to iterative initial values and strong global search ability, optimal estimates of the compensation parameters can be obtained accurately using this method, which ensures high compensation precision. The experimental results show that, after compensation, the maximum error of the x-component can be reduced from 622 nT to 26 nT, the y-component from 329 nT to 19 nT, and the z-component from 669 nT to 15nT.
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