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 333 for “"Line of Sight"”.
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Caution: Line-of-Sight in ICU Designs
<p>It has been estimated that by the end of 2015, the U.S. will spend approximately $200 billion in new healthcare facilities construction. Infection prevention, patient and family satisfaction, and technologies influence contemporary designs of critical care units. All of these impacts have …
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Scene reconstruction using accumulated line-of-sight
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Collision avoidance based on line of sight angle
… in technology, their presence in every sphere of life is rapidly increasing. Despite all the advancements, there is still a huge scope of improvement in many areas of robotics. Collision avoidance is one such problem which, despite a lot advancements, is far from being completely solved. Most …
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An optical system for line-of-sight communication
… beam to the receiver, avoiding the dangers of detection, jamming, and eavesdropping that traditional omnidirectional radio transmission entails. On the receiving end, a wide-angle detector is used. The system is integrated inconspicuously into a military vest, allowing the wearer to …
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Optimal maneuver guidance with sensor line of sight constraint
The problem of optimal guidance design for the low altitude, subsonic, vertical plane approach maneuver of an air vehicle constrained to maintain view of a fixed final position is studied using a nonlinear, constrained, optimal control problem formulation. Multiple, competing optimization criteria …
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Non-Line-of-Sight localisation of a sound source
… localisation techniques that are accurate in Non-Line-of-Sight (NLoS) conditions and system implementation of the proposed techniques. Such conditions can cause positive bias errors, namely NLoS errors, in the measured Time-of-Arrivals (ToAs) of first-arrival signals received by microphones and …
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Regularity-Preserving Terrain Simplification For Faster Line-of-Sight
… models play a key role in many applications. Line-of-sight queries, which are important operations in some applications (e.g. battlefield simulations), test whether or not two entities can see each other over the terrain. Given enough entities and a large enough terrain, computing these …
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Line-of-sight effects on strong lensing time delays
The effects of matter along the line-of-sight in strong gravitational lensing systems is widely recognised to have a non-negligible effect on lensing observables. In this project, we explore the Dominant-Lens Approximation, a new theoretical formalism designed to parameterise these effects, paying …
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Non-line-of-sight imaging using multi-bounce light
Non-line-of-sight (NLOS) imaging techniques produce images from light that has travelled from the scene of interest to the observer via indirect paths which typically include multiple reflections. Such techniques can be particularly useful when the direct line of sight between the observer and the …
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Line-of-sight guidance techniques for manned orbital rendezvous
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1963.
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Non-line-of-sight imaging using data-driven approaches
Non-line-of-sight (NLOS) imaging is desirable for its many potential applications such as detecting a vehicle occluded by a building's corner or imaging through fog. Traditional NLOS imaging techniques solve an inverse problem and are limited by computational complexity and forward model accuracy. …
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Assessment of Terrain Database Correlation Using Line-Of-Sight Measurements
The uncountable number of tools for the creation of synthetic terrains poses as a challenge for simulation interoperability. The permutations of tools, elevation maps, and software settings leads to combinations of poorly correlated virtual terrains. An important issue in distributed simulations is …
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A line-of-sight voice communication system with optoelectric fibers
… were still in development at the conclusion of our work, conventional photodetectors were substituted in the receiver circuits for the completed vest system. Nevertheless, the fiber -ready system demonstrated the potential of a wearable optical communication system and served as a successful …
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Non-Line of Sight Test Scenario Generation for Connected Autonomous Vehicle
… range can be further constrained by the presence of obstacles in its path or as a result of the geometry of the road, for example, at a junction. This is termed as a non-line of sight (NLOS) scenario where the ego vehicle (system under test) is unable to detect an oncoming dynamic object due to …
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An investigation into path analysis for line-of-sight microwave radio
An investigation into the analysis of Digital Microwave Radio Paths was conducted. The causes and effects of multipath fading on the propagation of microwave signals are of particular interest here. A study is made of the theory of link engineering, including an examination of fading and …
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Real-Time Non-Line-of-Sight Imaging Using Single-Photon LiDAR
… settings remains a significant challenge. Non-Line-of-Sight (NLOS) sensing allows for imaging systems to “see around corners", expanding their range of perception, providing access information for realtime decision-making. A promising approach to NLOS sensing is through single-photon LiDAR, …
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Learning-based Methods for Occluder-aided Non-Line-of-Sight Imaging
Imaging scenes that are not in our direct line-of-sight, referred to as non-line-of-sight (NLOS) imaging, has recently gained considerable attention from the computational imaging community. With a diverse set of potential applications in several domains, NLOS imaging is an emerging topic with many …
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Beyond Visual Line of Sight Drone Simulator with User-defined Risk Layers
As Beyond Visual Line of Sight (BVLOS) operations become increasingly prevalent across a range of UAV applications, the need for reliable tools to support safe mission planning and dynamic risk assessment is growing. This work introduces a web-based simulation framework for BVLOS flight planning …
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Effects of image distance and seat inclination on the line-of- sight angle
The line-of-sight angle (LOSA) was investigated for a simple tracking task. The distance from the eyes of the subject to the image was varied through the use of optical lenses. The subject was seated in a chair with 5 different back angles: 90 degrees, 111.6 degrees, 125 degrees, 158.5 degrees, and …
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Characterization and Evaluation of Non-Line-of-Sight Paths for Fixed Broadband Wireless Communications
… on the Virginia Tech campus show combinations of specular multipath and diffuse scattering at LMDS frequencies. An algorithm is presented that estimates link performance based on the channel impulse response. Presented and analyzed are representative impulse responses (one is primarily specular …
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