Abstract
Magnetic navigation is a promising positioning technique for scenarios where a global navigation satellite system (GNSS) is unavailable, such as for underwater submarines and aircraft in space. For ground scenarios, it faces more challenges, since the magnetic distribution suffers interference from surrounding objects such as buildings, bridges, and vehicles. It is natural to think how feasible it is to apply magnetic matching positioning to vehicles. In this paper, a theoretic distribution model is proposed to analyze the magnetic field around objects such as buildings, bridges, and vehicles. According to the experiments, it is shown that the proposed model matches the experimental data well. In addition, a comprehensive indicator metric is defined in this paper to describe the feasibility of the magnetic matching method based on the statistical characteristics of magnetic maps. The best length of matching window, anti-noise performance, and pre-comparison of positioning accuracy in different regions can be easily derived using the proposed comprehensive indicator metric. Finally, the metric is verified through a drive test using different building densities.
Highlights
The global navigation satellite system (GNSS) is widely used for the navigation of vehicles, since it can provide a high-precision and low-cost position service using a GNSS receiver integrated in a navigator or a smart phone
(2) We present a comprehensive indicator metric to describe the feasibility for magnetic navigation
4 ≈ scenario we could preliminarily guess the feasibility we can see the distribution of the1;surrounding buildings was in the following order: for magnetic navigation these four to be in we the could same order
Summary
The global navigation satellite system (GNSS) is widely used for the navigation of vehicles, since it can provide a high-precision and low-cost position service using a GNSS receiver integrated in a navigator or a smart phone. In Reference [16], it was pointed out that the matching length is related closely to the feasibility for the navigation of magnetic maps. When the magnetic map is more feasible, we can reduce the matching length properly to improve positioning efficiency. There are areas that are not suitable for magnetic navigation In these areas, the positioning accuracy is low even when the matching length is large enough. The indicator obtained from this method can only be used for comparison between two magnetic maps It cannot provide a reference in adjusting the matching length. We discuss impacts caused by ground factors on the feasibility of magnetic navigation and ways to compensate for the impacts This can be used to improve positioning accuracy.
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