Comprehensive Carrier Magnetic Interference Compensation Based on Magnetic Map Model

Aeromagnetic survey has high application value in geomagnetic navigation and geological exploration, but the magnetic interference of aircraft carrier structure materials and electronic equipment seriously reduces the accuracy of aeromagnetic survey. The key to carrier magnetic interference compensation is to estimate the parameters of the interference compensation model with high accuracy. However, the estimation accuracy is limited by the digital filtering preprocessing in the interference model and the undescribed onboard electronic equipment (OBE) interference. To solve the above problems, this article proposes a comprehensive carrier magnetic interference compensation strategy based on a magnetic map model (WMM). The global WMM combined with the 3-D Taylor polynomial (3DTP) regional magnetic anomaly field model is used to obtain the prior geomagnetic field information of the local regional space. It avoids the need for digital filtering preprocessing and then eliminates the problems of poor filtering effect, limited frequency band selection, and multicollinearity caused by digital filtering preprocessing. At the same time, the total current output by the aircraft carrier power supply and the flight speed are used to reflect the overall working condition changes of the carrier electronic equipment, so as to construct a polynomial function to more comprehensively characterize the influence of magnetic interference of the aircraft carrier electronic equipment on the extravehicular optical pump magnetometer and improve the traditional magnetic interference compensation model. The abovementioned comprehensive carrier magnetic interference compensation strategy can realize direct and accurate estimation of the magnetic interference compensation model parameters. The experimental results show that this method can achieve a better compensation effect of carrier magnetic interference.