Ometanje signala bežičnih mreža

undergraduate thesis

• Title (english): Wireless Network Signal Jamming
• Author: David Havrlišan
• Mentor: Marin Vuković (mentor)
• Mentor: Darko Možnik (mentor)
• Committee member: Ivica Smojver (predsjednik povjerenstva)
• Committee member: Marin Vuković (član povjerenstva)
• Committee member: Darko Možnik (član povjerenstva)
• Granter: University of Zagreb; (Croatian Defence Academy "Dr. Franjo Tuđman"); Zagreb
• Defense date and country: 2019-07-01, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Interdisciplinary Technical Sciences

Abstract

U današnje vrijeme postoji jako veliki broj mreža. Mreže dijelimo na dvije osnovne skupine: žične i bežične. U ovom završnom radu obrađena je tema bežičnih mreža, odnosno problem ili prijetnja ometanja signala bežične mreže. Cilj je približiti pojam ometanja na različitim frekvencijama te metode ometanja, odnosno uređaje koji se koriste u tu svrhu. Objašnjeni su osnovni principi i vrste ometanja s namjerom te je spomenuto nenamjerno ometanje. U svrhu etičkog ometanja, odnosno u svrhu zaštite, danas postoji mnoštvo uređaja od vojnih transportnih, do civilnih, komercijalnih te stacionarnih sustava. Kao eksperiment u svrhu dokazivanja jednostavnosti i dostupnosti, temeljem istraživanja metoda za ometanje implementirano je ometanje signala korištenjem programski definiranog radija. Pomoću programski definiranog radija, analiziran je frekvencijski spektar na kojima emitiraju radio postaje te je izabrana određena radio stanica čija je kvaliteta signala narušena pomoću emitiranja interferencijskog signala s programski definiranog radija.

Abstract (english)

Today, there is a very large number of networks. We divide the networks into two basic groups: wireless and wired. In this final paper, the topic of wireless networks is discussed and the threat of jamming of the wireless network signal. The aim of this final paper is to explain the concept of jamming at different frequencies, the methods and devices that are being used for the purpose of jamming. The matter of subject are basic principles and types of intentionall and unintentionall jamming. For the purpose of ethical interference, or for the purpose of protection, there are many devices being used nowadays, since it has become a top priority in many parts of the world. Types of jamming systems that are being used in that purpose are military convoy protection jamming systems, VIP convoy protection systems, portable/tactical jammers and stationary jamming systems. As an experiment for demonstrating simplicity and availability, jamming was implemented using software defined radio. With software defined radio, frequency spectrum on which the radio station was broadcast was analyzed and a certain radio station was selected, whose signal quality was disturbed by transmitting the interference signal with softwer defined radio.

• Keywords: ometanje; frekvencija; programski definiran radio; bežične mreže
• Keywords (english): jamming; frequency; software defined radio; wireless networks
• Language: croatian
• URN:NBN: urn:nbn:hr:249:041979
• Study programme: Title: Military Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica inženjer/inženjerka vojnog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica inženjer/inženjerka vojnog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-11-12 12:22:32