ETH - Indoor Positioning & Indoor Navigation


13:15 - 13:45	Andreas Schmitz-Peiffer (presenting author, at Astrium GmhH), Andre Nuckelt, Maik Middendorf, Micahel Burazanis: A new Navigation System for Indoor Positioning (InLite) A new Indoor navigation system has been developed by Astrium which allows positioning of users inside buildings with 2m accuracy without aiding indoor infrastructure. The possibility to navigate users inside a building is of high interest for fire brigade, ambulance, police or military operations. The InLite system consists of transmit stations positioned around the building, user terminals inside the building and a control unit for steering the transmit stations and for information broadcasting to the users. The transmit stations broadcast multi-carrier navigation signals from 420 to 460 MHz. The user receives the signals and calculates his position. The InLite signal design allows minimizing multipath effects so that the positioning accuracy even in massive multi-storey houses reaches 2 meters. The InLite system has been successfully tested. System architecture and measurement examples are presented and an outlook for future activities is given. This project is co-financed by the German Aerospace Center DLR.

13:45 - 14:15	Kostas Dragunas at Aalborg University: Indoor Multipath Mitigation The present paper surveys what can be done to mitigate multipath indoors and present some of the available multipath mitigation techniques. We look for techniques which would allow us to not just find the LOS signal, but also to extract all or at least the majority of secondary paths for further environment analysis. The scope of this paper is to show that to find better line of sight signal estimate and to separate multiple paths indoors even if they are closely spaced is possible and to demonstrate that using controlled environment setup (e.g. using simulated signals). The usual deconvolution algorithm is modified in such a way that it better identifies the individual multipath signals and yields an improved estimate of their time delay.

14:15 - 14:45	Anca Fluerasu, Alexandre Vervisch-Picois, Gianluca Boiero, Giorgio Ghinamo, Piero Lovisolo, Nel Samama (presenting author at Telecom SudParis): Indoor Positioning Using GPS transmitters: Experimental results The paper presents the results of an experimental campaign of the GNSS transmitter based approach for indoor positioning. Details on the chosen setup are given and the main features of the system are fully described. Comments on the positioning obtained accuracies, together with the description of the real environment are provided and an in-depth analysis of the performance of the system is proposed. For the next years the continuity of the positioning service indoors appears as a real challenge. GNSS, sensor networks or WLAN approaches are proposed in order to provide this continuity. The GNSS based approaches aim at making a better exploitation of the satellite signal on the receiver side. Unfortunately, techniques like HS-GPS or A-GPS do not seem to provide a definitive solution. Local infrastructure based solutions can aid to establish a final system with good accuracy and a large coverage: the approach described in the paper uses GPS transmitters that make GPS signals available indoors.
14:45 - 15:15	Kerem Ozsoy, Ayhan Bozkurt (presenting author) and Ibrahim Tekin: Indoor positioning system using GPS signals Civil Global Positioning System (GPS) has become very popular in recent years and it has widespread use in many areas such as traffic management, navigation, medical emergency services as well as location based services in wireless handsets. Owing to the latest technological advances, GPS receivers are able to locate themselves with an error of 5 meters outdoors. Although GPS positioning is very successful in outdoor areas, it is hard to decode GPS signals indoors due to the additional signal loss of 10-30 dB caused by the buildings and walls. There has been a wide research on indoor positioning systems utilizing different kind of technologies such as ultra wide band, RF, infrared and ultrasonic and hybrid based solutions. These solutions can find position accurately indoor areas. However, most of these solutions are required to have their own infrastructure set-up which could amount to large initial deployment costs. On the other hand, there are some cost effective indoor solutions that are based on the existing infrastructures such as WLAN, GSM, and Bluetooth. As most of these systems are deployed for radio communication rather than positioning, the coverage of these solutions for positioning are limited with the infrastructure and in most cases due to limited bandwidth and multipath propagation, location calculated by using the signals of these systems may not be that accurate. In our experimental set-up, in order to solve indoor coverage problem, we propose a novel indoor positioning system based on GPS infrastructure. Proposed indoor positioning system consists of GPS repeaters and a GPS receiver with improved positioning algorithms. In order to analyze the proposed indoor positioning system, a novel directional GPS antenna, very low noise GPS repeaters with amplifiers are designed, manufactured and measured. Positioning algorithms are implemented in a real time platform. All the system is combined and positioning is obtained for evaluation of the system performance. Results of the experiments show that the proposed system can be used for indoor positioning, and hence continuation of the GPS service can be expanded indoors with hardware addition to the buildings and a software update to the standard GPS receivers where indoor coverage is needed. We have done the experiment in a hallway as shown in Figure 1 where there are no GPS signals due to heavy obstruction due to building walls. For various locations in the hallway, calculations are performed on the GPS data picked up from the repeaters, and positions with high accuracy (1-5 meters) are obtained as summarized in Table 1.

15:15 - 15:30	Yoshihiro Sakamoto (presenting author, at Waseda Univ. Sugano Lab.), Haruhiko Niwa, Takuji Ebinuma, Kenjiro Fujii, and Shigeki Sugano: Pseudolite Indoor Localization Using Multiple Receivers - Performance Analysis of Increasing Receivers and Transmitters - The pseudolite has the potential to become one of the best solutions for indoor positioning due to its compatibility with GPS and its positioning accuracy. However, since cycle slips occur frequently indoors and their occurrence being difficult to predict, it is not easy to retain a sufficient number of consistent observation equations for the determination of position. There are two possible methods to avoid this problem: a) increasing the number of transmitters, which is known as an effective way for outdoor GPS, and b) increasing the number of receivers. In this paper, we evaluate the performance of these two methods for indoor positioning in terms of positioning success rates and the achievable accuracy. Our experiment shows that increasing the number of receivers is more effective than increasing the number of transmitters.

Wichtiger Hinweis:
Diese Website wird in älteren Versionen von Netscape ohne graphische Elemente dargestellt. Die Funktionalität der Website ist aber trotzdem gewährleistet. Wenn Sie diese Website regelmässig benutzen, empfehlen wir Ihnen, auf Ihrem Computer einen aktuellen Browser zu installieren. Weitere Informationen finden Sie auf
folgender Seite.

Important Note:
The content in this site is accessible to any browser or Internet device, however, some graphics will display correctly only in the newer versions of Netscape. To get the most out of our site we suggest you upgrade to a newer browser.
More information