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.
Results
Showing 1 to 20 of 38 for “"GPS receivers"”.
-
Adaptive Interference Mitigation in GPS Receivers
… below ambient thermal noise. Consequently, GNSS receivers must meet high standards of reliability and integrity to be used within a broad spectrum of applications. GNSS receivers must employ effective interference mitigation techniques to ensure robust, accurate, and reliable PNT service. This …
-
Dynamics of the geomagnetically disturbed ionosphere as measured by GPS receivers and SuperDARN HF radars
… content (TEC) data measured from ground-based GPS receivers is compared to HF backscatter from ionospheric irregularities obtained by Super Dual Auroral Radar Network (SuperDARN) radars. We present the first observations of a recurrent region of anomalous enhanced TEC at mid-latitudes over …
-
Machine Learning-based GPS Jamming and Spoofing Detection
… reliance on Global Positioning System (GPS) technology across various sectors has exposed vulnerabilities to malicious attacks, particularly GPS jamming and spoofing. This thesis presents an analysis into detection and mitigation strategies for enhancing the resilience of GPS receivers …
-
Atomic Clock Augmentation For Receivers Using the Global Positioning System
For receivers using the Global Positioning System (GPS), it is standard procedure to treat the receiver clock bias from GPS time as an unknown. This requires four range measurements to the satellites in order to solve for three dimensional position and clock offset. If the receiver clock could be …
-
Robust GPS-based timing for phasor measurement units based on single-receiver and multi-receiver position-information-aided vector tracking
… PMUs rely on the Global Positioning System (GPS) to provide the absolute time reference necessary to synchronize phasor measurements. The security and reliability of PMUs are essential to the future of the power grid and so in this work we aim to provide robust GPS timing for PMUs. Since …
-
Improving the robustness of GPS direct position estimation
Global Positioning System (GPS) receivers are increasingly used for positioning in urban environments and precise timing in critical infrastructures. These scenarios are challenging for GPS receivers because building reflection and obstruction contribute to GPS signal degradation in urban …
-
Risk-resilient GPS-based positioning, navigation, and timing using sensor fusion and multi-agent platforms
The Global Positioning System (GPS) has become a stealth utility for many applications, such as positioning and navigation for ground and aerial vehicles, and timing and synchronization for the modern power systems. However, GPS receivers suffer from various vulnerabilities, including measurement …
-
Signal Acquisition and Tracking for a Software Gps Receiver
Global Positioning System (GPS) is a satellite-based navigation system that has been used widely both in civilian and military for positioning, navigation, timing and other position related applications. The hardware-based GPS receivers provide the least user flexibility. Thus, it is necessary to …
-
Direct position tracking in GPS using vector correlator
Traditional GPS receivers track the code and carrier of individual satellite signals and estimate the position and velocity of the receiver using trilateration. Different from this two-step approach, direct maximum likelihood estimation of position has proved to be beneficial in weak signal and …
-
A software defined GPS signal simulator design
The Global Positioning System (GPS) signal simulator plays a critical role in developing and testing GPS receivers. Unfortunately, very few commercial GPS signal simulators are user-friendly for security researchers because they fail to generate abnormal GPS signals, which are fundamentally …
-
SH-3 helicopter/global positioning system integration analysis
The Global Positioning System (GPS) , the transmitted navigational signal, and the overall acquisition approach are explained. Navigational receiver components are functionally described and the hierarchy of platform integration and capability is discussed. Specifically explored is the integration …
-
Techniques in Kalman Filtering for Autonomous Vehicle Navigation
… vehicle suited with global position system (GPS) receivers, an inertial measurement unit (IMU), and wheel speed sensors (WSS) using the framework of Kalman filtering (KF). To demonstrate the flexibility of the KF several methods are explored and implemented such as constraints, multi-rate …
-
An Investigation of magnetic storm effects on total electron content over South Africa for selected periods in solar cycles 23 and 24
… where there are dense network of ground based GPS receivers for regional data coverage. Such efforts have been historically rare over the African region, and have only recently begun. This thesis reports the investigation of the effect of mid-latitude magnetic storms on TEC over South Africa …
-
Infrared Thermography And High Accuracy Gps For Automated Asphalt Crack Detection
… system (GNSS) which currently includes the GPS and GLONASS constellations. With the help of these systems, accurate location coordinates (longitude, latitude and altitude) up to a few centimeters were located. The objective of this research is to test the combined use of GNSS and infrared …
-
Analysis of periodic behavior of GPS time series at Pacoima Dam, California
High precision GPS receiver can yield position measurements within millimeter level accuracy. This accuracy provides an opportunity to observe subtle changes such as crustal movements. In addition,it allows the monitoring of large structures such as dams for safety reason. A GPS system was …
-
GIS and Satellite Visibility: Viewsheds from Space
The Global Positioning System (GPS) has recently become the significant mapping tool for millions of customers worldwide, providing its users with accurate terrestrial positions almost instantaneously. The functionality of a GPS receiver depends on the number of satellites to which it can establish …
-
Building history : learning with archival photographs
… been augmented with global positioning system (GPS) receivers and digital compasses. The metadata provided by these sensors are used to retrieve historical images of the locations that students photograph. This collection of photographs is used as evidence for hypotheses about how and why a city …
-
Atmospheric signal delay affecting GPS measurements made by space vehicles during launch, orbit and reentry
… ionosphere and total delays experienced by GPS signals traveling to space vehicles during launch, orbit and reentry. I calculate these delays for receivers at 0 km to 1700 km altitude by ray-tracing through the Global Reference Atmosphere Model (1999) and the International Reference …
-
Simplified Analysis of IMU Sensor Corruptions on Existing Pendulation Control System For Ship-Mounted Crane
… inertial navigation system using an IMU and dual GPS receivers. In trying to simplify the analysis of the IMU sensor, we simulate new control solutions based solely on an IMU-only ship motion measurement system using both position- and velocity-based controllers. This study shows that an optional …
Page 1 of 2