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 20 of 66 for “"radio signals"”.
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Human Mesh Recovery Using Radio Signals
… and bad lighting conditions. We leverage that radio frequency (RF) signals in the WiFi range traverse clothes and occlusions and bounce off the human body. Our model parses such radio signals and recovers 3D body meshes. Our meshes are dynamic and smoothly track the movements of the …
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Human activity analysis using radio signals
… and in poor lighting conditions. The model takes radio frequency (RF) signals as input, generates 3D human skeletons as an intermediate representation, and recognizes actions and interactions of multiple people over time, or even generate language descriptions for the event. By translating the …
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Courting Serendipity: The Search for Transient Radio Signals
The transient radio sky remains a frontier of observational astronomy, not for lack of scientific promise, but for practical obstacles: terrestrial radio frequency interference (RFI) and limited computing power. Today, a confluence of new RFI mitigation techniques and computing power makes a …
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Nonlinear ionospheric propagation effects on UHF and VLF radio signals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1991.
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Quantifying Nocturnal Itch And Its Impact On Sleep Using Machine Learning And Radio Signals
… consisting of 370 nights of infrared footage, radio-frequency (RF) data, and human annotations of scratching. Using this data, we develop a neural network model that can detect occurrences of nocturnal scratching using only radio signals. The developed model can achieve very high accuracy in …
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A Method of Determination of Ionospheric Electron Density Profiles From Faraday Rotation of Satellite Borne Radio Signals
Made available in DSpace on 2014-12-04T21:03:33Z (GMT). No. of bitstreams: 1 6303252.pdf: 1902022 bytes, checksum: 50340d9815e893d53f4d069f13c91861 (MD5) Previous issue date: 1962
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Wireless Sensing with Machine Learning: Through-Wall Vision & Contactless Health Monitoring
… This thesis demonstrates how we can use wireless signals and machine learning to sense people without any physical contact with their bodies. We develop novel radio sensors that sit in the background like a Wi-Fi router. Our sensors however analyze the surrounding radio signals using novel machine …
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Passive sensing of user behavior and Well-being at home
… the way they normally live. We leverage that radio frequency (RF) signals bounce off people, and carry information about them. This thesis presents systems, algorithms, and machine learning models to analyze the signals in the environment and infer information about people's behavior and …
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In-home passive monitoring for medical applications
… a novel hardware / software sensor that uses radio signals to enable patient health monitoring at home. It hangs on the wall like a picture frame and transmits low-power radio signals which reflect off of the user and return back to the device. By capturing and processing the reflected …
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Optical generation of mm-wave signals for use in broadband radio over fiber systems
In future cellular radio networks Radio over Fiber (RoF) is a very attractive technology to deliver microwave and millimeter-wave signals containing broad band multimedia services to numerous base stations of the network. The radio signals are placed on an optical carrier and distributed by means …
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Precise orbit determination of the Mars Odyssey spacecraft and geodetic inversion for the Martian gravity field
… of these techniques consists of the study of the radio signals emitted by a spacecraft, from which it is possible to derive the forces acted upon it. For this project, we used the radio science data from the Mars-orbiting spacecraft "IMars Odyssey". Launched in April 2001, more than two years of …
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Exploring the Vulnerabilities of Traffic Collision Avoidance Systems (TCAS) Through Software Defined Radio (SDR) Exploitation
… infeasible for an attacker to craft arbitrary radio signals, attackers today have access to open-source digital signal processing software like GNU Radio and inexpensive Software Define Radios (SDR). Therefore, this thesis presents motivation through analytical and experimental means for more …
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A cooperative communication protocol for wireless ad-hoc networks
… the link layer, where nodes actually broadcast signals simultaneously to increase signal strength. Using network topology information derived from propagation delay measurement, nodes dynamically establish and update membership in rebroadcasting cells. Rebroadcast cells use constructively …
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Wireless Intrusion Detection Sytem
… insecurity of wireless media results from radio signals extending beyond the networks intended coverage area and the weaknesses in the standards result from the methods used for authorization and privacy. These insecurities restrict the use of wireless networks by entities that need a high …
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A phase measurement radio positioning system for indoor use
… here the detailed design for a low frequency radio navigation system called the Building Positioning System (BPS). This system is designed to work indoors, where the microwave radio signals of the Global Positioning System (OPS) cannot be received. Potential applications for this system range …
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Design and prototype of an all digital system for baseband FM multiplex signal demodulation
… of baseband frequency modulated (FM) radio signals. In this project, an all digital system for demodulating baseband FM Multiplex (MPX) signals is simulated, designed, and prototyped on a Xilinx Spartan-3AN FPGA. The design architecture is simulated using Scilab numerical computation …
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Robust range-based localization and motion planning under uncertainty using ultra-wideband radio
… a mobile robot using ultra-wideband (UWB) radio signals in GPS-denied environments; and planning robot trajectories that incorporate belief uncertainty using probabilistic state estimates. Addressing the former, we improve upon traditional approaches to range-based localization by capturing …
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Radio Wave Propagation Measurements and Modeling for Land Mobile Satellite Systems
… satellite system is roadside attenuation of the signals due to vegetation or urban structures. System designers should have the most reliable information about the statistics of the propagation channel to build reliable systems that can compensate for bad propagation conditions. In 1998, the …
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Stream Communication and Computation in the Eight-meter-wavelength Transient Array (ETA) Radio Telescope
… is a unique implementation of an array-based radio telescope. The instrument is designed to further astronomy by detecting and characterizing dispersed pulses received between 29–47 MHz. To aid data processing of radio signals received through 24 antennas, the ETA system performs real-time …
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Total Electron Content reconstruction using triple frequency GNSS signals
… (GPS) is currently being modernized to transmit radio signals on an additional third frequency, while the European Galileo is a newly developed system which will transmit on three civil frequency bands. One of the major error sources affecting GNSS is the delay caused when the signals pass …
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