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Providing accurate time information to a radio base station via a GPS receiver emulator
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. (Radio Communication Lab/CCS)
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In recent years, there has been a significant increase in the use of Global Positioning Satellite system (GPS) technology, consequently the usage of GPS receivers has increased. These GPS receivers can be used as a synchronization source for radio base stations by generating precise 1 pulse per second signals and providing National Marine Electronics Association (NMEA) data.

The prototype developed in this thesis, implements a GPS receiver emulator to emulate a GPS receiver which is to be used for radio base station synchronization. Hardware and software have been used to generate the NMEA messages and to generate a precise 1 pulse per second signal. A graphical user interface (GUI) has been created in order to allow the operators of the emulator to input various parameters to the system used to emulate a GPS receiver.

Using this emulator avoids the need for expensive GPS receivers and their connection to an antenna with a good view of the GPS satellites. More importantly, this GPS receiver emulator makes it easier to set up a lab environment for testing different situations with regard to signaling with NMEA data between the emulated GPS receiver and the radio base station equipment that is under test. For example, this allows tests involving incorrect NEMA messages or non once per second pulses.

Abstract [sv]

De senaste åren har det skett en significant ökning av användandet av GPS teknik; följdaktligen har användandet av GPS mottagare ökat. GPS mottagare kan användas som en synkroniseringskälla för radiobasstationer genom att generera exakt 1 puls per sekund och därmed förse NMEA datan.

Prototypen som utvecklats i detta examensarbete, implementerar en GPS emulator för att erbjuda en effektiv lösning till att emulera en GPS mottagare som används för synkronisering av basstationer. Olika hårdvara och mjukvara har använts för att simulera NMEA meddelanden och för att generera en precis 1 puls per sekund signal. Ett grafiskt gränssnitt (GUI) har utvecklats för att tillåta användaren av emulatorn att mata in olika parametrar till systemet som används för att emulera GPS mottagaren.

Användandet av den här emulatorn tar bort behovet av dyra GPS mottagare, och gör det enklare att sätta upp en labbmiljö för testandet av olika situationer med hänsyn till signalering mellan 1 puls per sekund och NMEA datan av den simulerade GPS mottagaren och basstationshårdvaran som testas.

Place, publisher, year, edition, pages
2013. , xiii, 69 p.
Trita-ICT-EX, 2013:1
Keyword [en]
GPS receiver, NMEA data, 1 pulse per second, Radio Base Station
Keyword [sv]
GPS mottagare, NMEA datan, 1 pulse per skund, Radiobassstationer
National Category
Communication Systems
URN: urn:nbn:se:kth:diva-118070OAI: diva2:604497
2013-01-07, Seminar room Motola, Isafjordsgatan 22, Kista, 14:00 (English)
Available from: 2013-02-11 Created: 2013-02-11 Last updated: 2013-09-09Bibliographically approved

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