Analysis and compensation of background magnetic field error for pedestrian navigation system

2017 ◽  
Author(s):  
Xiaochun Tian ◽  
Jiabin Chen ◽  
Jianyu Shang ◽  
Yifei Ling ◽  
Liujun Wang
Keyword(s):  
Magnetic Field ◽  
Navigation System ◽  
Pedestrian Navigation ◽  
Background Magnetic Field

Electronic Compass Calibration in Pedestrian Navigation System

2012 ◽  
Vol 490-495 ◽  
pp. 1246-1250
Author(s):  
Xiao Juan Zhang ◽  
Xi Sheng Li ◽  
Yi Bo Feng
Keyword(s):  
Magnetic Field ◽  
Navigation System ◽  
Direct Method ◽  
Dead Reckoning ◽  
Pedestrian Navigation ◽  
Movement Characteristic ◽  
Calibration Algorithm ◽  
Heading Angle ◽  
Compass Calibration ◽  
Electronic Compass

In this paper, a kind of pedestrian navigation system (PNS) that based on Earth’s magnetic field is introduced, and the error of the build-in electronic compass is analyzed, and an efficient calibration algorithm is presented. The PNS is determined pedestrian’s movement locus by calculating the heading angle and analyzing the movement characteristic, and then using the dead reckoning algorithm to combine the information together. The precision of PNS is affected by the error of the electric compass, because the heading angle is calculated from the magnetic field data measured by the compass. In order to reduce the measure error, a direct method which is used to calibrate the compass, based on ellipsoid fitting, is developed.

scholarly journals Drift Reduction in Pedestrian Navigation System by Exploiting Motion Constraints and Magnetic Field

Sensors ◽  
2016 ◽  
Vol 16 (9) ◽  
pp. 1455 ◽  
Author(s):  
Muhammad Ilyas ◽  
Kuk Cho ◽  
Seung-Ho Baeg ◽  
Sangdeok Park
Keyword(s):  
Magnetic Field ◽  
Navigation System ◽  
Motion Constraints ◽  
Pedestrian Navigation

scholarly journals Lower Limb Model Based Inertial Indoor Pedestrian Navigation System for Walking and Running

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Wanling Li ◽  
Zhi Xiong ◽  
Yiming Ding ◽  
Zhiguo Cao ◽  
Zhengchun Wang
Keyword(s):  
Navigation System ◽  
Lower Limb ◽  
Pedestrian Navigation ◽  
Model Based

Parametric excitation of magnetoacoustic waves by a pump magnetic field in a high-β plasma

1977 ◽  
Vol 17 (1) ◽  
pp. 93-103 ◽  
Author(s):  
N. F. Cramer
Keyword(s):  
Magnetic Field ◽  
Parametric Excitation ◽  
Acoustic Waves ◽  
Magnetic Pressure ◽  
Gas Pressure ◽  
Alfven Wave ◽  
Fast Wave ◽  
Magnetoacoustic Waves ◽  
Background Magnetic Field ◽  
The Waves

The parametric excitation of slow, intermediate (Alfvén) and fast magneto-acoustic waves by a modulated spatially non-uniform magnetic field in a plasma with a finite ratio of gas pressure to magnetic pressure is considered. The waves are excited in pairs, either pairs of the same mode, or a pair of different modes. The growth rates of the instabilities are calculated and compared with the known result for the Alfvén wave in a zero gas pressure plasma. The only waves that are found not to be excited are the slow plus fast wave pair, and the intermediate plus slow or fast wave pair (unless the waves have a component of propagation direction perpendicular to both the background magnetic field and the direction of non-uniformity of the field).

On the existence of compressional MHD oscillations in an inhomogeneous magnetoplasma

1990 ◽  
Vol 44 (2) ◽  
pp. 361-375 ◽  
Author(s):  
Andrew N. Wright
Keyword(s):  
Magnetic Field ◽  
Wave Equation ◽  
Density Distribution ◽  
Cold Plasma ◽  
Wave Equations ◽  
Perturbation Field ◽  
Plasma Density Distribution ◽  
Background Magnetic Field ◽  
Transverse Fields ◽  
The Magnetic Field

In a cold plasma the wave equation for solely compressional magnetic field perturbations appears to decouple in any surface orthogonal to the background magnetic field. However, the compressional fields in any two of these surfaces are related to each other by the condition that the perturbation field b be divergence-free. Hence the wave equations in these surfaces are not truly decoupled from one another. If the two solutions happen to be ‘matched’ (i.e. V.b = 0) then the medium may execute a solely compressional oscillation. If the two solutions are unmatched then transverse fields must evolve. We consider two classes of compressional solutions and derive a set of criteria for when the medium will be able to support pure compressional field oscillations. These criteria relate to the geometry of the magnetic field and the plasma density distribution. We present the conditions in such a manner that it is easy to see if a given magnetoplasma is able to executive either of the compressional solutions we investigate.

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