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Showing 1 to 20 of 70 for “"Global Navigation Satellite System"”.

  1. Low-cost and flexible USRP based real-time global navigation satellite system receiver for ionospheric sounder

    Kim, DoyounUniversity of Illinois at Urbana-Champaign2018

    Made available in DSpace on 2018-03-13T15:28:45Z (GMT). No. of bitstreams: 2 KIM-THESIS-2017.pdf: 2624944 bytes, checksum: 54f94eb1b16a5d22d1bcb586b0c1a959 (MD5) LICENSE.txt: 4207 bytes, checksum: 1a026929318db256d44e97c1d5dc823a (MD5) Previous issue date: 2017-12-15

    uiuc Repository record

  2. Factors That Affect the Global Positioning System and Global Navigation Satellite System in an Urban and Forested Environment.

    Ritchie, Douglas Allen2007

    … time measurements acquired from GPS and GLONASS satellite observations using RTK techniques in an urban and forested environment. To determine this accuracy, 2 data sets of 3-dimensional coordinates were created and compared at 14 stations situated at East Tennessee State University. One data set …

    etsu Repository record

  3. Design and Simulation of a Planar Crossed-Dipole Global Navigation Satellite System (GNSS) Antenna in the L1 Frequency Band

    Katragadda, MaheshOhio University2012

    … the performance of a planar cross-dipole Global Navigation Satellite System (GNSS) receiver antenna to operate in GNSS L1 frequency band with multipath mitigation performance. First, a crossed-half-wavelength dipole antenna was designed to resonate centered at 1.6 GHz, and then various …

    ohiolink Repository record

  4. Dense, sonar-based reconstruction of underwater scenes

    Vaz Teixeira, Pedro Nuno.Massachusetts Institute of Technology2019

    … accuracies of (i) its pose estimate in some global frame, (ii) the estimates of offsets between mapping sensors and platform, and (iii) the accuracy of the mapping sensor measurements. Typically, surface-based surveying platforms will employ highly accurate positioning sensors-e.g. a …

    mit Repository record

  5. SIGNAL ANALYSIS AND RADIOHOLOGRAPHIC METHODS FOR AIRBORNE RADIO OCCULTATIONS

    Wang, Kuo-Nung

    Global Positioning System (GPS) radio occultation (RO) is an atmospheric sounding technique utilizing the change in propagation direction and delay of the GPS signal to measure refractivity, which provides information on temperature and humidity. The GPS-RO technique is now operational on several …

    purdue-thes Repository record

  6. Development and analysis of a parallelized direct position estimation-based GPS receiver implementation

    Peretic, MatthewUniversity of Illinois at Urbana-Champaign2019

    … one-step Direct Position Estimation (DPE)-based Global Navigation Satellite System (GNSS) receivers can achieve more accurate localization than their two-step counterparts. However, numerical solutions to DPE equations and approximations made for those equations introduce new effects that can …

    uiuc Repository record

  7. GNSS-based relative navigation for LEO nanosatellite laser communications

    Grenfell, Peter W.(Peter William)Massachusetts Institute of Technology2020

    … in concert with rising interest in small satellite mission concepts. The CubeSat Laser Infrared CrossinK (CLICK) mission has the objective of demonstrating the first Low-Earth orbit (LEO) nanosatellite crosslink. The need for precise and accurate pointing with laser instruments motivates a …

    mit Repository record

  8. Vision-Based Aerial Navigation Using Satellite Offline Maps

    Kempf, LudwigVirginia Tech2026

    While Global Navigation Satellite System (GNSS) technology combined with advanced augmentation techniques provides high accuracy, its reliance on signal integrity leaves safety-critical applications vulnerable to spoofing and jamming. To address this, a lightweight vision-based localization module …

    vt Repository record

  9. Using Random Sampling Consensus (RANSAC) to Detect Errors in Global Navigation Satellite Systems (GNSS) Signals and Data

    Shah, NiharEast Carolina University2021

    A positioning, navigation, and timing (PNT) signal can be used to estimate a user's position at an identified time. A global navigation satellite system (GNSS) uses the PNT signal to provide satellite-based navigation. Advanced receivers can track multiple GNSS constellations simultaneously. In …

    ecu Repository record

  10. Error Mitigation in Roughness Measurements

    Wang, ZhuosongVirginia Tech2014

    … exist. To measure the roads, terrain profiling systems are commonly used. Modern systems based on laser scanners and inertial navigation systems (INS) are able to measure thousands of data points per seconds over a wide path. However, because of the subsystems in the profiling systems, they are …

    vt Repository record

  11. Navigation for UAVs using Signals of Opportunity

    Al Aziz, MasudUniversity of Kansas2015

    … reliance of Unmanned Aerial Vehicles (UAVs) on Global Navigation Satellite System (GNSS) for autonomous operation represents a significant vulnerability to their reliable and secure operation due to signal interference, both incidental (e.g. terrain shadowing, ionospheric scintillation) and …

    ku Repository record

  12. Impact Analysis and Design Development for Air-Dropped Antarctic Seismo-Geodetic Ice Penetrator

    Miller, Alex S.Massachusetts Institute of Technology2023

    … rapid deployment of a broadband seismometer and Global Navigation Satellite System (GNSS) positioning system designed to sense ice shelf resonant forcings caused by ocean gravity waves and atmospheric waves. Additionally, SGIP will track seismic indications of calving and rifting, facilitating …

    mit Repository record

  13. Aerodynamic and Thermal Considerations for an Antarctic Ice Penetrator

    Makikalli, Aaron R.Massachusetts Institute of Technology2023

    … kinetic penetrator designed to deliver a Global Navigation Satellite System (GNSS) and geodesy-grade seismometer to the Ross Ice Shelf (RIS) in Antarctica such that the seismometer becomes buried 2 m deep in the ice, ensuring coupling with the ice shelf. This vehicle provides a means to …

    mit Repository record

  14. THE USE OF CONDUCTIVE INK IN ANTENNA EDUCATION AND DESIGN

    Addison, David William

    … designs satisfy the requirements of a compact Global Navigation Satellite System (GNSS) antenna while showing a competitive performance within the current market. One best design is shown along with three other structures. These antennas consist of a bowtie cross-dipole over a reflective disc …

    siu-theses Repository record

  15. Landscape of Legislation: A Photographic Investigation of the Mendip Hills Area of Outstanding Natural Beauty

    Wyatt, David Anthony2019

    … of abandoned mine workings using a handheld Global Navigation Satellite System receiver. The remaining three case studies were the sites of scheduled monuments within the Mendip Hills AONB. At each of these sites the boundary of the designation was used to lead a critical photographic …

    plymouth Repository record

  16. Rotational Transformation Methods for Radio Occultation and Passive Microwave Radiometry Colocation Analysis

    Halperin, LucyMassachusetts Institute of Technology2021

    Global Navigation Satellite System Radio Occultation (GNSS-RO) and passive microwave radiometry (MWR) provide useful atmospheric profiles for inputs into Numerical Weather Prediction models. However, both remote sensing techniques face unique challenges that require auxiliary atmospheric data to …

    mit Repository record

  17. Place recognition for GNSS-denied autonomous multi-robot search and rescue

    Giamou, Matthew PeterMassachusetts Institute of Technology2017

    … of this task is exacerbated in areas without Global Navigation Satellite System (GNSS) coverage, as absolute pose measurements are unavailable. This thesis explores solutions to the place recognition problem for UAVs under a dense forest canopy. The perception and communication challenges in a …

    mit Repository record

  18. GNSS-based Spacecraft Formation Flying Simulation and Ionospheric Remote Sensing Applications

    Peng, YuxiangVirginia Tech2017

    The Global Navigation Satellite System (GNSS) is significantly advantageous to absolute and relative navigation for spacecraft formation flying. Ionospheric remote sensing, such as Total Electron Content (TEC) measurements or ionospheric irregularity studies are important potential Low Earth Orbit …

    vt Repository record

  19. GNSS Hardware-In-The-Loop Formation and Tracking Control

    Harris, Frederick Bernard Jr.Virginia Tech2016

    … research explores the creation of a predictive navigation and control algorithm for formation keeping and tracking, raw measurement data collection, and building a real-time GNSS closed HWIL testbed for simulations of different vehicles. The L1 frequency band of the Global Positioning System …

    vt Repository record

  20. Management and Analysis of Localization Information in Uncrewed Aerial Systems

    Kumar, Anand MaheshVirginia Tech2025

    … (UAVs), particularly in environments where Global Navigation Satellite System (GNSS) signals are degraded or unavailable. This thesis investigates how 5G cellular networks - leveraging dense terrestrial infrastructure, precise timing, and recently standardized UAV oriented capabilities - can …

    vt Repository record

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