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Sitemap > Bulletin Board > Diplomarbeiten, Bachelor- und Masterarbeiten > Diplomarbeit / Masterarbeit -- Multipath Mitigation through Beamforming Considering Quantization and enabling Carrier Phase Estimation in a GNSS Receiver
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Diplomarbeit / Masterarbeit -- Multipath Mitigation through Beamforming Considering Quantization and enabling Carrier Phase Estimation in a GNSS Receiver

23.07.2008, Diplomarbeiten, Bachelor- und Masterarbeiten

A Global Navigation Satellite System (GNSS), like GPS or the upcoming European Galileo system, utilizes the concept of time-of-arrival (TOA) ranging to determine a user s position. This concept entails measuring the time it takes for a signal transmitted by an emitter at a known location (satellite) to reach a user s receiver. The quality of the data provided by a GNSS receiver largely depends on the synchronization error with the signal transmitted by the GNSS satellite (navigation signal), that is, on the accuracy in the propagation delay estimation of the direct signal (line-of-sight signal, LOSS). The synchronization of a navigation signal is usually performed by a closed loop called a delay lock loop (DLL). In case the LOSS is corrupted by several superimposed delayed replicas (multipath), this estimator becomes severely biased. In order to effectively mitigate multipath in a GNSS receiver, multiple receive antennas with robust array processing techniques (e.g. digital beamforming) shall be considered. Additionaly, one has to take into account that received signal is quantized by an analog-digital converter (ADC) and hence, the available signal for the signal processing to be performed at the receiver has a finite resolution. The effect of this quantization shall be also considered in this thesis. Moreover, the developed beamforming algorithms shall enable robust and precise carrier phase estimation in order to achieve a higher positioning accuracy. The tasks addressed in this thesis are part of a current project between the Lehrstuhl fuer Netzwerktheorie und Signalverarbeitung (NWS, Institute for Circuit Theory and Signal Processing) with the Institute for Communications and Navigation within the Deutsches Zentrum fuer Luft- und Raumfahrt (DLR, German Aerospace Center).

Kontakt: M.Sc. Mario Castaneda / Dipl.-Ing. Amine Mezghani (NWS, Room N1129) Email: mario.castaneda@nws.ei.tum.de / amine.mezghani@nws.ei.tum.de, Dipl.-Ing. Felix Antreich (DLR), Email: felix.antreich@dlr.de