Abstract
The position of a magnetic target can be obtained through magnetic anomaly which is measured by a magnetic sensor. Comparing with vector magnetic sensor, the measurement value of the scalar magnetic sensor is almost not influenced by its orientation in measurement coordinate axes. Therefore, scalar magnetic sensors can be easily assembled into an array. Based on analysis of the total scalar magnetic anomaly measured by scalar magnetometer, we present an efficient method for tracking a magnetic target using scalar magnetometer array. In this method, we separate the position information and magnetic moment information of magnetic target by matrix transformation. Then, we can obtain the position of the magnetic target in real time by a scalar magnetometer array and a particle swarm optimization algorithm. In addition, the magnetic moment of the target can be estimated when the target’s position had been calculated. The simulation shows that the position of the target can be calculated accurately and the relative error of the position is <5 %. The calculated magnetic moment of the target is close to the theoretical value. In addition, execution time of each calculation is <1 s. Thus, the position of the magnetic target can be obtained in real-time through this method.
Highlights
It is well known that magnetic object like unexploded ordnance (UXO) or underwater vehicle can be detected by magnetic sensors
Population size of the particle swarm optimization (PSO) algorithm In the first experiment, the magnetic target was at a fixed position and we changed the population size of the PSO algorithm to calculate the position of the target
In this paper, we propose an efficient method for tracking the magnetic target in realtime, which consists of scalar magnetometers array and a PSO algorithm
Summary
It is well known that magnetic object like unexploded ordnance (UXO) or underwater vehicle can be detected by magnetic sensors. There are different ways for localization or track of the magnetic object through magnetic anomaly (Nara et al 2006; McFee and Das 1981; Wynn et al 1975; Wahlstrom and Gustafsson 2014; McGary 2009; Birsan 2011; Song et al 2014; Liu and Wang 2010). We can locate magnetic object like UXO using either a single magnetic sensor or sensor array with a designed scan routine (scan several lines) (Abdelrahman and Essa 2015; McFee and Das 1981). We can use the magnetic contour map to locate the position of static magnetic object. We can estimate a magnetic source with six parameters, three describing the position and three describing the magnetic moments of a target. The vector magnetic sensor can measure three components of the magnetic field. In order to calculate six parameters, at least two vector sensors
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