The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Hybrid Algorithmic Framework Using IMU and WPS for Smart Phone Positioning Systems

스마트폰 IMU와 WPS를 결합한 복합 측위 방법론

  • Received : 2013.03.06
  • Accepted : 2013.07.29
  • Published : 2013.08.30
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Abstract

The drastic growth of mobile communication and spreading of smart phone make the significant attention on Location Based Service. The one of most important things for vitalization of LBS is the accurate estimating position for mobile object. Focusing on IMU deployed in smart phone, we develop a hybrid positioning estimation framework with a combination of WPS. The developed approaches can strengthen the advantages of independent indoor applicability of IMU. The estimation of IMU is efficiently compensated by radio fingerprint based Wi-Fi Positioning System. We put a focus especially on the hybrid algorithmic framework. Compared on the existing approaches of WPS or IMU, we achieve the comparable higher performance on both of average error of estimation and deviation of errors. Furthermore test-bed based on smart phone platform is practically developed and all data have been harvested from the actual measurement of test indoor area. This can approve the practical usefulness of proposed framework.

무선인터넷과 이동통신 기술의 발달 및 스마트폰의 급속한 확산으로 인해 사용자의 현재 및 과거의 위치 정보를 사용하여 다양한 부가정보를 제공하는 위치기반 서비스에 대한 관심이 급증하고 있다. 위치기반 서비스의 본격적인 활성화를 위해서는 정확한 측위가 기본이 된다. GPS (Global Positioning System)과 WPS (Wi-Fi Positioing System)가 상용화 되면서 측위 기술에 일대 혁신을 가져왔으나 실내환경에서 많은 제약을 가졌다. 이에 관성센서(IMU: Inertia Motion Unit)를 사용한 네비게이션 (Navigation)기술을 실내환경에서 응용하려는 시도가 정밀 측위의 관점에서 논의되고, 관성센서의 장착이 스마트폰에 일상화 되면서 실내 정밀 측위 확산의 시초를 갖게 되었다. 본 논문에서는 IMU와 WPS를 결합하여 각각의 단점을 극복하고 측위 품질을 혁신적으로 향상 시킬 수 있는 알고리즘 프레임워크를 제안한다. 본 연구를 위해 스마트폰에서 구현되는 측위 테스트 프로그램을 구현하고 이를 적용할 실질적인 실내외 테스트베드를 구성하여 활용하였으며 이로서 대규모로 확장 적용할 수 있는 기반을 구성했다는 면에서 충분한 의미를 지닌다.

Keywords

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