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Radiobaserad positionering för UAV'er
Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.
2013 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Navigering med UAV:er kräver att farkostens och eventuellt ett måls position går att mäta ut under flygtillfället. I det allra flesta fall önskas en så hög noggrannhet som möjligt på positionen. DECCA är ett pensionerat system som var konstruerat för att läsa av fasförändringar mellan multiplar av en grundfrekvens. Systemet hade analoga mätare som gav utslag på förändringen av fasen och positionen kunde mätas ut på speciella kartor med inteferenslinjer som motsvarade en viss fasskillnad. GPS ger idag en precision ner på ett par meter, men med optimeringstekniker DGPS går det att komma ner i centimeternoggrannhet. Förutsättningen är att UAV:en befinner sig i ett geografiskt område med en minimal propagering på GPS-signalen. GPS är ett system som används idag och som fortfarande utvecklas. Fokus har lagts på att beskriva hur GPS går till väga för att få en hög precision på positioneringen och med de svårigheter som uppkommer med de långa avstånden mellan mottagaren och satelliten. En kort beskrivning över DECCA-systemets svagheter och styrkor ges, samt en kort sammanställning över hur DECCA och GPS skulle prestera i ett system med sändande antenner utplacerade över ett mindre geografisk område. 

Abstract [en]

UAV navigation requires that the position of the vehicle and perhaps the destination to be measured, in flight. The reliability of close accuracy are in most case crucial for a positioning system. DECCA was constructed to measure the phase differences between several broadcasting frequencies, where all origin from one same fundamental frequency and broadcast as multiples of the source frequency. The system had analog meters which indicated the phase differences and with different interference lines corresponding to a certain phase different printed on a map, one could denote a rough position for the receiver. Today’s GPS grants accuracy within a few meter, but with technology as DGPS the precision can extend to a few centimetres. The condition for the precise position is where the GPS-signal are exposed for minimal propagation effects. Thus, the crucial is the receiver’s geographic location. Today GPS is active and used by numerous user around the world, but it is constant under development and improvement. The focal point has been to describe how GPS gets a good accuracy and the difficulties with the long distances between receiver and satellite. A short description over the weakness and strengths in DECCA has been made. And one short compilation over how well DECCA and GPS would perform in a system with multiple broadcast antennas, placed over a limited geographic area.   

Place, publisher, year, edition, pages
2013. , 65 p.
Keyword [sv]
Radionavigering, UAV, Positionering, GPS, DECCA
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-101202ISRN: LiTH-ISY-EX-ET--13/0410--SEOAI: oai:DiVA.org:liu-101202DiVA: diva2:665658
Subject / course
Information Coding
Examiners
Available from: 2013-11-22 Created: 2013-11-20 Last updated: 2013-11-22Bibliographically approved

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CiteExportLink to record
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