A Multiposition Initial Alignment Method of Portable MIMU/FOG Compound Navigation System

In the future, a pedestrian navigation system (PNS) will be widely applied. In navigation system, an initial alignment is essential before starting navigation. There are two primary alignment methods, one is an inertial/magnetometer assisted alignment method, the other is a multiposition rotation mo...

Full description

Saved in:
Bibliographic Details
Published in:IEEE access 2020, Vol.8, p.162066-162072
Main Authors: Cai, Xiaowen, Zhang, Chunxi, Yang, Yanqiang, Gao, Shuang, Zhang, Ruoyu
Format: Article
Language:English
Subjects:
Alignment
Earth
Fiber optics
Inertial platforms
initial alignment
Least squares method
Magnetic disturbances
Magnetic field measurement
Magnetic separation
Magnetometers
Microelectromechanical systems
Micromechanical devices
MIMU/FOG compound navigation system
Modulation
multiposition
Navigation
Navigation systems
Optical fibers
Trigonometric functions
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In the future, a pedestrian navigation system (PNS) will be widely applied. In navigation system, an initial alignment is essential before starting navigation. There are two primary alignment methods, one is an inertial/magnetometer assisted alignment method, the other is a multiposition rotation modulation alignment method. However, magnetometer is susceptible to magnetic disturbance, and the large volume of rotary modulation system is not suitable for PNS. To solve these problems, a compound navigation system (CPNS) is proposed. It consists of a single-axis fiber-optic gyro (FOG) and a triaxial microelectromechanical system inertial measurement unit (MIMU) without modulation mechanism. CPNS is placed in different positions. According to the variation law of cosine function, FOG data in multiposition are used as fitting alignment, MEMS gyro tracks attitude changes between different positions. The experimental results demonstrate that initial alignment accuracy can be well calculated with several multiposition schemes under different conditions. This method could be a novel solution for PNS's initial alignment.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2949120