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Showing 1 to 20 of 106 for “"global navigation"”.

  1. A subsampling delta-sigma modulator for global navigation satellite systems

    Ucar, A.University of Westminster2010

    Next-generation Global Navigation Satellite Systems (GNSS) receivers should be capable of processing multi-frequency signals in order to provide better positioning accuracy and signal availability to end-user. Nevertheless, the realization of such receivers with conventional receiver architectures …

    westminster Repository record

  2. Global Navigation Satellite Systems as Signals of Opportunity for Environmental Applications: Reflectometry and Scintillation

    IMAM, RAYAN MOHAMED ELMUBARAK ALIPolitecnico di Torino2022

    L'abstract è presente nell'allegato / the abstract is in the attachment

    poli-torino Repository record

  3. 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

  4. 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

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

    Ritchie, Douglas Allen2007

    <p>The purpose of this study was to evaluate the accuracy in real 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 …

    etsu Repository record

  6. The Global Navigation System Scope (GNSScope): a toolbox for the end-to-end modelling simulation and analysis of GNSS

    Kazazoglu, R.University of Westminster2010

    … of the work is collectively referred to as the Global Navigation System Scope (GNSScope) Toolbox, offering a complete, fully reconfigurable platform for the end-to-end modeling, simulation and analysis of satellite navigation signals and systems, covering the signal acquisition, tracking, and …

    westminster Repository record

  7. 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

  8. 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

  9. Using an empirical model of human turning motion to aid heading estimation in a personal navigation system

    Jakel, Tom Bryan2013

    With the adoption of Global Navigation Satellite Systems in smart phones, soldier equipment, and emergency responder navigation systems users have realized the usefulness of low cost Personal Navigation Systems. The state-of-the-art Personal Navigation System is a unit that fuses information based …

    umn Repository record

  10. 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

  11. 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

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

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

    … (PAT). The focus of this work is the initial Global Navigation Satellite System (GNSS) based relative navigation pointing process for LEO crosslinks and downlinks. In Chapter 2, the baseline CLICK pointing budgets are given for crosslink and downlink relative navigation based body pointing. …

    mit Repository record

  13. 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

  14. Smooth Feedback Planning

    Lindemann, Stephen R.University of Illinois at Urbana-Champaign2015

    … combined together to create a solution to the global navigation problem. In addition to standard navigation problems, approaches to trajectory tracking and multiple robot coordination are described to illustrate the flexibility of the approach.

    uiuc Repository record

  15. An Investigation of magnetic storm effects on total electron content over South Africa for selected periods in solar cycles 23 and 24

    Van de Heyde, Valentino PatrickUniversity of the Western Cape2012

    … to space weather activities on both local and global scales. In the past several decades, the International Global Navigation Satellite Systems Service (GNSS) networks of dual frequency receiver data have been applied to develop global and regional models of ionospheric TEC. These models were …

    western-cape Repository record

  16. Using a co-located GNSS radio occultation payload for microwave radiometer calibration

    Davé, Pratik K. (Pratik Kamlesh)Massachusetts Institute of Technology2014

    … radio occultation (RO) instrument with Global Navigation Satellite Systems (GNSS). The radiometer and RO receiver periodically observe the same volume of atmosphere near the earth's limb, allowing for overlapping, or collocated, measurements that can be used to calibrate the radiometer. …

    mit Repository record

  17. Error Mitigation in Roughness Measurements

    Wang, ZhuosongVirginia Tech2014

    … 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 susceptible to errors that reduce the accuracy of the measurements. Thus, both …

    vt Repository record

  18. 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

  19. 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

  20. 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

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