Heading misalignment estimation between portable devices and pedestrians

A. Ali, H. W. Chang, J. Georgy, Z. Syed, C. Goodall

Research output: Contribution to conferencePaperpeer-review

16 Citations (Scopus)


Major technological advancements of mobile phones in the last few years have greatly increased their navigation potential. Applications such as location-based services (LBS) and portable navigation and guidance applications can now be used on these phones. Nowadays, most smartphones and tablets are embedded with sensors such as accelerometers, gyroscopes, magnetometers, and barometers alongside the Global Navigation Satellite Systems (GNSS) receivers. In certain applications, the accelerometers and magnetometer can be used to provide a navigation solution however the user is required to keep the portable device in a specific orientation with respect to his/her body. Unfortunately, it is unreasonable to assume that keeping the phone in a fixed orientation is a common use case. A navigation solution capable of accurately interpreting measurements from portable devices while being used in common scenarios is needed. The navigation solution must be functional irrespective of the way the user is using it, i.e., whether it is carried in hand, attached to a belt, on ear during normal calling scenario, in a backpack, etc. The solution must be able to determine the navigation state of the device and allow the person carrying the device to move between indoors and outdoors seamlessly, without any constraints on how the device is carried. To summarize, the estimation of the pedestrian's position and attitude has to be independent of the device use case. In this paper, a new technique is proposed to provide the heading misalignment angle between the mobile device and the pedestrian. This work is patent pending. The proposed technique covers the whole misalignment space, not just discrete or pre-determined values of such angle. It can work with various types of walkers with different gaits and speeds. Different test scenarios are conducted to assess the performance of the proposed technique including different use cases. The results clearly demonstrated the efficacy of the proposed technique in enabling real-time, continuous and reliable consumer localization indoors and outdoors with mobile device.

Original languageEnglish
Number of pages8
Publication statusPublished - 2013 Jan 1
Event26th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2013 - Nashville, TN, United States
Duration: 2013 Sep 162013 Sep 20


Other26th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2013
Country/TerritoryUnited States
CityNashville, TN

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Transportation


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