A system for indoor positioning using ultra-wideband technology
Examensarbete för masterexamen
Embedded electronic system design (MPEES), MSc
The global positioning system is used in a wide array of applications. The ability to get an accurate location of a person or object has led to a number of so-called location-based services, mainly in logistics but also in more consumer applications such as localized weather information etc. This works well where a clear view of the sky will enable the GPS system to pinpoint your location with sufficient accuracy. However, in an indoor environment the signals will be badly disrupted by the material between the user and the satellites, making it significantly harder to use the system to determine your location. Here, a localized system based on a different technology is needed to allow all of the incredibly useful applications based on the user position to continue functioning as intended. In this thesis multiple possible techniques for usage in indoor positioning are presented and what their main advantages and disadvantages are. A technology was then chosen to be implemented and evaluated, which was ultra-wideband technique because of its accuracy and robustness. This technique uses radio frequencies with large bandwidth to send a high amount of energy in a short pulse, making it robust to obstacles as well as enabling the time of the received signal to be accurately calculated. The end product is a working indoor positioning system using ultra-wideband technology with a high accuracy in line of sight, and graceful degradation in non-line of sight and mixed conditions. The latency is low enough to be able to use as a real-time location system, providing that the problems with the information transfer to the server over Ethernet are fixed. The system has the possibility of tracking multiple tags, and has an accuracy of 15 to 30 centimeters depending on the conditions. This coupled with the range of upwards of 20 meters means that the system is viable for a wealth of applications, and ultra-wideband is a strong contender for the large amount of systems targeted at indoor positioning applications.
Informations- och kommunikationsteknik , Data- och informationsvetenskap , Information & Communication Technology , Computer and Information Science