Change search
ReferencesLink to record
Permanent link

Direct link
3-D Positioning in Large Warehouses using Radio-frequency identification
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, The Institute of Technology.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In large warehouses, there are a lot of articles that needs do be kept track of. As the number of articles grows larger, the administrative complexity increases. Thus, a solution that automatically keeps track of the position of each article in real-time is of interest. That is, if an item in the warehouse is moved, no manual administration should be needed to know the new position of the item.

Radio detection and ranging (RADAR) is a ranging technique that doesn’t need to communicate with an object to find the distance to it, instead signals are sent and when they are reflected off the object and returned to the sender, the distance to the object may be calculated. However, you cannot tell two equally shaped objects apart purely based on RADAR techniques. There are many other techniques for ranging, sound navigation and ranging (SONAR) is another example, but they all lack the possibility of detecting the identity of the object.

So, in order to find a specific item’s position, some kind of  communication with the item is necessary. Radiofrequency identification (RFID) is a neat technology with which this is possible. An RFID reader can send radio signals out in the air, and objects that are in the vicinity of the reader and are tagged with an RFID tag can receive that signal and respond with it’s unique identification number. This way, the RFID reader can identify the RFID tagged object from a distance. There are also a variety of ways to approximate the distance between reader and tag. Unfortunately this is a rather difficult task, especially in indoor  environments.

There are already some existing products on the market that uses RFID for different kinds of positioning. In this thesis, the theory behind positioning, the fundamentals of RFID and different positioning solutions will be analysed and presented.

A number of tests were carried out with an RFID system within the ultra-high frequency (UHF) band, which is around 866 MHz. The test system only supported range estimation based on the received signal strength indicator (RSSI) and the test results showed that narrowband RSSI measurements are highly disturbed by multipath propagation which make the overall positioning performance insufficient. Further analysis of time based range estimation techniques, such as time of arrival (TOA), time of flight (TOF) and time difference of arrival (TDOA), revealed that better positioning accuracy is possible, especially if ultra-wide bandwidth (UWB) is used.

Place, publisher, year, edition, pages
2014. , 50 p.
Keyword [en]
RFID, Positioning
National Category
Communication Systems
URN: urn:nbn:se:liu:diva-111913ISRN: LiTH-ISY-EX-14/4795-SEOAI: diva2:761874
External cooperation
Subject / course
Communication Systems
Available from: 2014-11-10 Created: 2014-11-09 Last updated: 2014-11-10Bibliographically approved

Open Access in DiVA

Jonas_Karhu(1246 kB)193 downloads
File information
File name FULLTEXT01.pdfFile size 1246 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Karhu, Jonas
By organisation
Communication SystemsThe Institute of Technology
Communication Systems

Search outside of DiVA

GoogleGoogle Scholar
Total: 193 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 958 hits
ReferencesLink to record
Permanent link

Direct link