Tesi sul tema "Radar in aeronautics"
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Miller, Samuel(Samuel John). "Object tracking in mmWave radar networks". Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127079.
Testo completoCataloged from the official PDF of thesis.
Includes bibliographical references (pages 71-87).
Location-aware devices enable new services such as localization and tracking of objects within existing wireless communication networks like cellular mobile, Wi-Fi, and radio. To ensure these services are also available in the evolving millimeter wave (mmWave) communication infrastructure, it is important to develop algorithms that enable mmWave devices, like radars and 5G nodes, to localize and track objects. The main challenges that these algorithms must address is localizing objects that are not carrying sensing equipment, synchronizing devices exclusively via the mmWave band, and solving a data association uncertainty problem to reliably track objects of interest. Our development of the Multistatic Networking with mmWave Radar Arrays for Positioning (MiNiMAP) system solved these challenges by implementing mmWave processing in a multistatic network, scheduling, and radar synchronization algorithms. Through the use of these three algorithms in addition to Bayesian filtering, MiNiMAP is capable of tracking a single object with a network of mmWave radars. Indoor localization experiments validate MiNiMAP's overall system performance and the impact of each algorithm.
by Samuel Miller.
S.M.
S.M. Massachusetts Institute of Technology, Department of Aeronautics and Astronautics
Reynolds, Obie D. "Life cycle analysis of a radar system". Master's thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-12232009-020224/.
Testo completoMarais, Karen 1973. "The development and analysis of Scanned Pattern Interferometric Radar". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/82229.
Testo completoAqui, Paula S. (Paula Simone). "Meteorological effects on the accuracy of the measurement of radar cross sections". Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/43127.
Testo completoBerisset, Philippe. "Simulation of millimeter wave radar return from a three dimensional environmental scene". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/49905.
Testo completoHacker, Troy L. (Troy LeRoy) 1976. "Performance analysis of a space-based GMTI radar system using separated spacecraft interferometry". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9088.
Testo completoIncludes bibliographical references (p. 153-156).
The development of a model to assess the radar performance capabilities of a sparse aperture space-based GMTI radar system is presented. Airborne radars have provided reliable detection of moving targets for many years. Recent technological advancements have allowed the deployment of radar systems in space to improve global coverage. Additional radar performance benefits from space-based platforms are made possible with clusters of collaborative microsatellites. Using quantitative capability metrics, specifically the probability of detection and the minimum detectable velocity, the performance of the radar system can be modeled to enable effective and unbiased comparison of candidate system architectures. A design study based on the space-based GMTI radar reference mission for the Air Force's TechSat 21 program was conducted to identify viable system design configurations that satisfy specific radar performance requirements. A comprehensive analysis of the cost, reliability, and performance considerations for the complete TechSat 21 system is proposed.
by Troy L. Hacker.
S.M.
Wickert, Douglas P. (Douglas Paul). "Space based radar--system architecture design and optimization for a space-based replacement to AWACS". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10513.
Testo completoReid, David Charles. "Improved aircraft flight parameter estimation based on passive acoustic techniques using time-frequency methods". Thesis, Queensland University of Technology, 1997.
Cerca il testo completoDavis, Bradley A. "A clutter power computation procedure for airborne Doppler radar". Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53722.
Testo completoMaster of Science
Volpe, Kyle Clarke. "Application of the backward-smoothing extended Kalman filter to attitude estimation and prediction using radar observations". Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/51646.
Testo completoIncludes bibliographical references (p. 317-322).
The Lincoln Attitude Estimation System (LAES), a new tool being developed for the Space Situational Awareness Group (SSAG) at MIT Lincoln Laboratory, integrates several existing hardware and software systems, with a backward-smoothing extended Kalman filter (BSEKF). LAES is intended to determine the rotational motion of a freely tumbling spacecraft from a sequence of discrete-time radar images. The raw range-Doppler returns are collected using a ground-based sensor, which is owned and operated by the SSAG, and processed into a set of range/cross-range images. A three-dimensional geometric model is, through computer graphics procedures, displayed on top of the two-dimensional radar images, enabling an analyst to rotate (and scale in cross-range) the model in order to align it to the object's image. Therefore, the orthographic projection matrix that the computer graphics procedures computed to display the computer model, simultaneously describes the projection of the object onto the radar image plane. These measurements are essentially corrections to a nominal or baseline motion which had to be assumed in order to generate the images in the first place. Combining the reference motion, which describes the orientation of the image plane in inertial space, with the sequence of rotations describing the attitude of the spacecraft within the image plane, yields the final set of attitude measurements which are then passed to the BSEKF for processing.
(cont.) The existing free motion software currently in use within the Space Situational Awareness Group makes two critical assumptions: 1) that that the spacecraft is a symmetric rigid body and 2) that there are no disturbance torques acting on the spacecraft during the imaging period. The Lincoln Attitude Estimation System removes these simplifying assumptions in favor of a more flexible approach which is better suited for long-term studies of rigid body motion. Accordingly, several additions have been made to the backward-smoothing extended Kalman filter, including the addition of environmental torque models and an algorithm which generates an initial estimate for the inertia tensor using the same geometric model used in the image-model matching process. The BSEKF solves a nonlinear smoothing problem for the current and past sample intervals using iterative numerical techniques. This approach retains the nonlinearities of a fixed number of stages that precede the time of interest, and processes information from earlier stages in an approximate manner. The algorithm has been tested using simulated and actual data from a challenging spacecraft attitude estimation problem in which there is significant measurement noise, poor initial state estimates, and highly nonlinear system dynamics. The filter compensates for this uncertainty through concurrent estimation of the attitude and moment of inertia parameters. The filter has been demonstrated to accurately and reliably converge on a motion solution in both types of test cases.
by Kyle Clarke Volpe.
S.M.
Nazir, Mahvish. "Automotive radar target detection using ambiguity function". Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6842/.
Testo completoLayden, Robert Greathouse. "A numerical analysis of the radar cross section of an arbitrary shaped over-moded re-entrant cavity". Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/13749.
Testo completoVydhyanathan, Arun. "Effect of atmospheric paticulates on airborne laser scanning for terrain-referenced navigation". Ohio : Ohio University, 2006. http://www.ohiolink.edu/etd/view.cgi?ohiou1163793662.
Testo completoYoung, Steven D. "On The Development Of In-Flight Autonomous Integrity Monitoring Of Stored Geo-Spatial Data Using Forward-Looking Remote Sensing Technology". Ohio University / OhioLINK, 2005. http://www.ohiolink.edu/etd/view.cgi?ohiou1113854420.
Testo completoJasteh, Donya. "Experimental low-THz imaging radar for automotive applications". Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7523/.
Testo completoSpaulding, Timothy J. (Timothy James) 1979. "Tools for evolutionary acquisition : a study of Multi-Attribute Tradespace Exploration (MATE) applied to the Space Based Radar (SBR)". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/82703.
Testo completoThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Statement of responsibility on t.p. reads: 2nd Lieutenant Timothy J. Spaulding, USAF.
Includes bibliographical references (p. 139-142).
by Timothy J. Spaulding.
S.M.
Kakarlapudi, Swarna. "APPLICATION OF IMAGE ANALYSIS TECHNIQUES IN FORWARD LOOKING SYNTHETIC VISION SYSTEM INTEGRITY MONITORS". Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1090265512.
Testo completoGaviria, Maldonado Mauricio. "Assessment of the effects of refractive conditions on electronic warfare in central America". Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA240523.
Testo completoThesis Advisor(s): Davidson, Kenneth L. Second Reader: Hershey, Scott H. "September 1990." Description based on title screen as viewed on December 29, 2009. Author(s) subject terms: Retractive conditions, prongation, Central America, radar, microwave. Includes bibliographical references (p. 60-61). Also available in print.
Khan, Kamran. "Refractive conditions in Arabian Sea and their effects on ESM and airborne radar operations". Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA238273.
Testo completoThesis Advisor(s): Davidson, Kenneth L. ; Powell, James R. "September 1990." Description based on title screen as viewed on December 29, 2009. DTIC Descriptor(s): Frequency, Electronic Warfare, Aircraft, Airborne, Electronic Equipment, Microwave Equipment, Radar, Profiles, Ducts, Meteorology, Communication And Radio Systems, Refraction, Arabian Sea, Refractometers, Military Operations. DTIC Identifier(s): Radar interference, meteorological phenomena, theses. Author(s) subject terms: Refractivity, Arabian Sea refractive conditions, ESM airborne radar, airborne microwave refractometer (AMR), IREPS, EREPS. Includes bibliographical references (p. 96-97). Also available in print.
Filip-Dhaubhadel, Alexandra [Verfasser]. "L-Band Digital Aeronautical Communication System (LDACS)-Based Non-Cooperative Passive Multistatic Radar for Civil Aviation Surveillance / Alexandra Filip-Dhaubhadel". München : Verlag Dr. Hut, 2021. http://d-nb.info/1238423035/34.
Testo completoBurgess, Norman Keith. "A high speed radar data acquisition and processing system for an experimental monopulse tracking radar". Thesis, 1994. http://hdl.handle.net/10539/21786.
Testo completoThis project report describes the development of a high speed data acquisition and processing system (DAPS) for an experimental monopulse tracking radar at the Division of Manufacturing and Aeronautical Systems Technology (Aerotek), of CSIR. The system development involved replacement of existing data acquisition hardware and software with an enhanced, PC based, integrated high speed data acquisition system. The system is used for radar acceptance testing, radar monitoring during trials and capture of large volumes of data for off-line processing to pursue research into the phenomenology of radar cross section. The work performed during the execution of this project represents an effort in three technology areas. These are Digital hardware design of custom interface hardware for the ISA bus as implemented on most PC's. This was not a major aim of the project, but was required in the absence of suitable hardware. Formal software specification and design using the real time extensions of Hatley and Pirbhai to the Yourdon and de Marco data flow analysis methodology. The existing software had not been designed using any formal method, and suffered a lack of documentation throughout all phases of the development. The way this project was undertaken has served as an exercise in following the approach, which resulted in a product which is better documented and more maintainable. There are elements of total quality management that are still missing though. • Quality management during software development. At the time of commencement of the project there was no formal commitment to software quality management at Aerotek. Commitment to IS09000 accreditation in future has required that a solid quality ethic and management system be instituted. Current software development follows this approach. A discussion of the topic appears in the conclusion. The DAPS has been in use for approximately two years now. With continued minor modification to meet new user requirements, it has successfully enhanced the usability of the radar system during trials and measurements with the SAAF.
MT2017
Makkapati, Vishnu Vardhan. "Ultra High Compression For Weather Radar Reflectivity Data". Thesis, 2006. http://hdl.handle.net/2005/311.
Testo completoWeather is a major contributing factor in aviation accidents, incidents and delays. Doppler weather radar has emerged as a potent tool to observe weather. Aircraft carry onboard radars but their range and angular resolution are limited. Networks of ground-based weather radars provide extensive coverage of weather over large geographic regions. It would be helpful if these data can be transmitted to the pilot. However, these data are highly voluminous and the bandwidth of the ground-air communication links is limited and expensive. Hence, these data have to be compressed to an extent where they are suitable for transmission over low-bandwidth links. Several methods have been developed to compress pictorial data. General-purpose schemes do not take into account the nature of data and hence do not yield high compression ratios. A scheme for extreme compression of weather radar data is developed in this thesis that does not significantly degrade the meteorological information contained in these data. The method is based on contour encoding. It approximates a contour by a set of systematically chosen ‘control points’ that preserve its fine structure up to a certain level. The contours may be obtained using a thresholding process based on NWS or custom reflectivity levels. This process may result in region and hole contours, enclosing `high' or `low' areas, which may be nested. A tag bit is used to label region and hole contours. The control point extraction method first obtains a smoothed reference contour by averaging the original contour. Then the points on the original contour with maximum deviation from the smoothed contour between the crossings of these contours are identified and are designated as control points. Additional control points are added midway between the control point and the crossing points on either side of it, if the length of the segment between the crossing points exceeds a certain length. The control points, referenced with respect to the top-left corner of each contour for compact quantification, are transmitted to the receiving end. The contour is retrieved from the control points at the receiving end using spline interpolation. The region and hole contours are identified using the tag bit. The pixels between the region and hole contours at a given threshold level are filled using the color corresponding to it. This method is repeated till all the contours for a given threshold level are exhausted, and the process is carried out for all other thresholds, thereby resulting in a composite picture of the reconstructed field. Extensive studies have been conducted by using metrics such as compression ratio, fidelity of reconstruction and visual perception. In particular the effect of the smoothing factor, the choice of the degree of spline interpolation and the choice of thresholds are studied. It has been shown that a smoothing percentage of about 10% is optimal for most data. A degree 2 of spline interpolation is found to be best suited for smooth contour reconstruction. Augmenting NWS thresholds has resulted in improved visual perception, but at the expense of a decrease in the compression ratio. Two enhancements to the basic method that include adjustments to the control points to achieve better reconstruction and bit manipulations on the control points to obtain higher compression are proposed. The spline interpolation inherently tends to move the reconstructed contour away from the control points. This has been somewhat compensated by stretching the control points away from the smoothed reference contour. The amount and direction of stretch are optimized with respect to actual data fields to yield better reconstruction. In the bit manipulation study, the effects of discarding the least significant bits of the control point addresses are analyzed in detail. Simple bit truncation introduces a bias in the contour description and reconstruction, which is removed to a great extent by employing a bias compensation mechanism. The results obtained are compared with other methods devised for encoding weather radar contours.