A Vector-based Azimuth Algorithm using Indoor-Positioning Systems for Mobile Nodes

Son, Joo-Young

Journal of Navigation and Port Research 2014;38(5):457-462.
Published online October 31, 2014.

이동노드의 실내위치파악 시스템을 통한 벡터기반 상대방위각 알고리즘

손주영

A Vector-based Azimuth Algorithm using Indoor-Positioning Systems for Mobile Nodes

Joo-Young Son

Abstract

Indoor-positioning systems are useful to various applications. Navigation system is one of the most popular applications, which needs the information of directions of nodes’ movements. Specifically the applications should get the information in real-time to properly show the current moving position of a node. In this paper, simple vector-based algorithms are proposed to compute amount and direction of changes of azimuth of mobile nodes’ heading directions using existing indoor positioning systems in indoor environments where azimuth sensors do not work properly. Previous algorithms calculate the azimuth changes by too many steps of topology-based formula. The algorithms proposed in this paper get the amount of changes of azimuth by simple formula based on vector, and determine the direction of changes by the sign of value of simple formula based on the previous movement of nodes. The algorithms are much simpler and less error-prone than previous ones, and then they can detect changes in many location-based applications as well. The performance of the algorithms is proved logically and mathematically.

Key Words: Azimuth;Heading Directions;Vector Algorithm;Indoor Positioning Systems;Navigation Systems