search query: @keyword UHF / total: 16
reference: 6 / 16
« previous | next »
Author:Liukku, Matti
Title:UHF-RFID Identification and Positioning of Butterflies
Perhosten identifiointi ja paikannus käyttäen UHF-RFID -tekniikkaa
Publication type:Master's thesis
Publication year:2008
Pages:48 (+2)      Language:   eng
Department/School:Teknillisen fysiikan laitos
Main subject:Optiikka ja molekyylimateriaalit   (Tfy-125)
Supervisor:Kaivola, Matti
Instructor:Seppä, Heikki
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

Logging on to the customer computers

  • Aalto University staff members log on to the customer computer using the Aalto username and password.
  • Other customers log on using a shared username and password.

Opening a thesis

  • On the desktop of the customer computers, you will find an icon titled:

    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

  • You can either print the thesis or read it on the customer computer screen.
  • You cannot save the thesis file on a flash drive or email it.
  • You cannot copy text or images from the file.
  • You cannot edit the file.

Printing the thesis

  • You can print the thesis for your personal study or research use.
  • Aalto University students and staff members may print black-and-white prints on the PrintingPoint devices when using the computer with personal Aalto username and password. Color printing is possible using the printer u90203-psc3, which is located near the customer service. Color printing is subject to a charge to Aalto University students and staff members.
  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark TF80     | Archive
Keywords:RFID
localization
UHF
RSSI
butterfly
RFID
paikannus
UHF
RSSI
perhonen
Abstract (eng): The flight capability of a butterfly is an important research focus when studying butterfly populations.
In the thesis a positioning system for butterflies was developed.
UHF RFID using passive tags was chosen for the positioning.
A small butterfly antenna was developed and the localization of the butterflies was accomplished by using directive reader antennas connected to RFID readers.
The used RFID implementation did not include localization and it had to be done on system level.

The thesis presents different positioning methods based on electro-magnetic signals.
A technique based on measuring the attenuation of the received signal strength with distance was used to find out the positions of the butterflies.
The received signal strength was translated into a distance estimate by using experimental results from calibration measurements.
The biggest problems in the distance estimation were the anisotropic radiation pattern of the butterfly antenna and the signal interference caused by reflections.

In the thesis we successfully designed and implemented a fully functional positioning system for butterflies.
This enables the research of the flight patterns and activity of butterflies.
Abstract (fin): Perhospopulaatioiden käyttäytymistä tutkittaessa perhosen lentokyky on tärkeä tutkimuskohde.
Diplomityössä kehitettiin perhosille paikannusjärjestelmä UHF-RFID - tekniikkaa ja passiivisia RFID -tageja soveltaen.
Työssä suunniteltiin pieni, perhosen selkään kiinnitettävä UHF -antenni.
Perhoset paikannettiin suuntaavilla lukija-antenneilla, jotka oli kytketty RFID -lukijoihin Itse paikannus jouduttiin toteuttamaan järjestelmätasolla, koska RFID -tekniikka ei itsessään sisällä toteutusta paikannukselle.

Työssä esitellään erilaisia sähkömagneettisiin signaaleihin perustuvia paikannustapoja, joista käytettäväksi valittiin vastaanotetun tehon vaimentumiseen matkan funktiona perustuva etäisyydenmääritys.
Antennien vastaanottama teho muutetaan etäisyydeksi kalibraatiomittauksista saatujen kokeellisten tulosten avulla.
Suurimpia ongelmia etäisyydenmittaukseen aiheuttivat perhosantennin epäisotrooppinen säteilykuvio ja heijastuksista aiheutuva interferenssi mittaussignaalissa.

Diplomityössä onnistuttiin luomaan toimiva paikannusjärjestelmä perhosille.
Tämä mahdollistaa perhosten lentoratojen ja -aktiivisuuden mittaamisen.
ED:2009-02-17
INSSI record number: 36754
+ add basket
« previous | next »
INSSI