| Citation: | WANG Yao, SHAO Jianda, HU Guohang, et al. Research and detection of magnetic anomaly signals of moving vehicles at different speeds[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(6): 1125-1132. doi: 10.13700/j.bh.1001-5965.2019.0426(in Chinese)
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As speed increases, there is the creation of non-steady-state materials in vehicles, such as high-temperature combustion of gasoline and free charge accumulation caused by high-speed friction. These signals can not be explained by magnetic dipole model suitable to ferromagnetic materials. To solve this problem, a method combining the equivalent model of magnetic dipole and motion charge is proposed in this paper. The magnetic anomaly signals of vehicles at different speeds were calculated theoretically, their characteristics in time domain and frequency domain were analyzed, and the dependence relationship between magnetic anomaly signals and speeds was obtained. Further, a weak magnetic detection experiment device was constructed for detecting the magnetic anomaly signals of vehicles at different speeds in time domain, using the Tunnel Magnetoresistance sensor (TMR) combined with filtering, amplification and analog-digital conversion technology. The frequency-domain information was obtained using Fourier transform and the results agree with the theoretical model. In addition, the frequency-domain signal spectrum shifts to the high frequency as speed increases, which is extremely significant to extract weak magnetic target signals from low-frequency geomagnetic background field.
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