Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"GPS L1"”.
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Adaptive Interference Mitigation in GPS Receivers
… hop-frequency and chirp-type interferences from GPS L1 signals. To mitigate unwanted interference, state-of-the-art ANFs typically adjust a single parameter, the notch centre frequency, and zeros are constrained extremely close to unity. Because of this, the notch centre frequency converges …
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Resilient Navigation through Jamming Detection and Measurement Error Modeling
… technologies to protect, toughen, and augment GPS for a more resilient PNT. Time-sequential estimation improves navigation accuracy and allows for the augmentation of GNSS with other difficult-to-interfere sensors. Safety-critical navigation applications (e.g., GNSS/INS-based aircraft …
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Development of a Multi-Frequency Adaptive Kalman Filter Based Tracking Loop for an Ionospheric Scintillation Monitoring Receiver
This thesis develops a combined GPS L1, L2C and L5 KF based tracking loop by exploiting the dispersive nature of the ionosphere and signal structure of the GPS signals. This results in a robust tracking loop suitable for a scintillation monitoring receiver. It also incorporates an adaptive …
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A Multi-Constellation Multi-Frequency GNSS Software Receiver Design for Ionosphere Scintillation Studies
… results of scintillation effects on the new GPS L5 signal based on data collected using a real-time scintillation monitoring and data collection system at HAARP, Alaska. The data collection setup includes a custom narrow band front end that collects GPS L1, L2 IF samples and two …
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GNSS pre-correlation waveform feature extraction methods for multipath-afflicted signal classification
… MATLAB. For testing and simulation purposes, the GPS L1 C/A signal structure was selected, as it represents the most fundamental GNSS signal, being the simplest in structure, and potentially allows for further extensions considering more complex-structured signals. The test data are numerically …
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Low Profile Integrated GPS and Cellular Antenna
… or multiple independent bands. The civilian GPS system is quickly becoming the standard for personal and commercial navigation and position location. The difficulty with GPS is that there is no return link. That is, a GPS terminal determines its position, but that position is known only to …
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Implementação de serviço on-line para processamento de dados GNSS com solução das ambiguidades pelo método lambda para aplicação em linhas de base curtas no posicionamento relativo estático rápido
… 0,124m (RTKLIB) e 0,186m (TBC) para dados GPS L1. Espera-se que o desenvolvimento deste serviço proporcione novas oportunidades em diversas pesquisas, auxiliando na disseminação do conhecimento em processamento de dados GNSS utilizando softwares científicos. Palavras-chave: Software Bernese …
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Implementation of Real-Time Software Receiver for Gps or Glonass L1 Signals
A 12 channel real-time GPS L1 C/A-code software receiver has been implemented on a Desktop with 1.84GHz Intel CPU. The software receiver has the capability to acquire new satellites coming in, keep tracking of satellites in view and give a user solution accuracy of 30 meters. This study also …
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The Mid-Latitude Ionosphere: Modeling and Analysis of Plasma Wave Irregularities and the Potential Impact on GPS Signals
… their influence on Global Positioning System (GPS) scintillations. First, the physical mechanism of the Temperature Gradient Instability (TGI), which is a strong candidate for producing mid-latitude irregularities, is proposed. The electro- static dispersion relation for TGI is extended into …
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Multi-Constellation GNSS Scintillation at Mid-Latitudes
Scintillation of Global Positioning Systems (GPS) signals have been extensively studied at low and high latitude regions of the Earth. It has been shown in past studies that amplitude scintillation is severe at low latitudes and phase scintillation is severe at high latitudes. Unlike low and high …