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 37 for “"Direction Finding"”.
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Electronic Observers for Radio Direction Finding
Made available in DSpace on 2014-12-04T21:03:28Z (GMT). No. of bitstreams: 1 6202974.pdf: 3442482 bytes, checksum: ad88823717abc242053156a36de05d6b (MD5) Previous issue date: 1962
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An Investigation of Space Diversity Radio Direction Finding
Made available in DSpace on 2014-12-04T21:03:32Z (GMT). No. of bitstreams: 1 6206240.pdf: 3108726 bytes, checksum: 68329242c60b9a0948c02585bd41092e (MD5) Previous issue date: 1962
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High-resolution direction finding in multi-dimensional scenarios
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Development of a Single-Channel Direction Finding Algorithm
A radio direction finding (DF) system uses a multiple-element antenna array coupled with one or more receivers to estimate the direction-of-arrival (DOA) of a targeted emitter using characteristics of the signal received at each of the antennas in the array. In general, DF systems can be classified …
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Array Signal Processing Algorithms for Beamforming and Direction Finding
… algorithms in the application of beamforming and direction of arrival (DOA) estimation. In the beamformer design, we employ the constrained minimum variance (CMV) and the constrained constant modulus (CCM) criteria to propose full-rank and reduced-rank adaptive algorithms. Specifically, for the …
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Biodiversity and dynamics of direction finding accuracy in bat biosonar
… and receiver sensitivity are distributed over direction and frequency through beampattern functions that have diverse and often complicated geometries. This complexity could be used by the animals to determine the direction of incoming sounds based on spectral signatures. The present study in …
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Toward a micro-scale acoustic direction-finding sensor with integrated electronic readout
… toward a microelectromechanical (MEMS) acoustic direction-finding sensor based on the Ormia ochracea fly’s ear. First, linear elastic stiffness models are presented and then validated by using a nanoindenter to measure the sensor’s stiffness directly. The measured stiffness is highly linear, and …
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Direction Finding and Beamforming Techniques using Antenna Array for Wireless System Applications
This thesis is concentrated on the Angle / Direction of Arrival (A/DOA) estimation and Beamforming techniques that can be used in the current and future engineering applications such as tracking of targets, wireless mobile communications, radar systems, etc. This thesis firstly investigates …
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Investigation of a reconfigurable GPS antenna for direction finding and nulling applications
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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Design and Implementation of an RFI Direction Finding System for SKA Applications
… testing of a system which is able to find the direction which a source of interference is coming from. User requirements for the system are captured, and one of the key requirement of the system is the ability to direction-find two classes of RFI: weak narrow-band continuous signals, and strong …
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A correlation-based method for direction finding of multipath signals in frequency hopping systems
Direction finding is of great interest in many applications such as GPS (Global Positioning System), radar, sonar and wireless communication systems. In smart antenna systems, the direction of users is an important factor to increase the capacity, and an antenna array is usually used at the base …
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DSSS detection and direction finding methods for a DSP-based small aperture DF system
… an investigation into methods for detection and direction finding of direct-sequence spread-spectrum signals (DSSS), appropriate for a particular DSP-based direction finding platform. Relevant details on DSSS and radio direction finding are presented. These are used as the theorectical basis for …
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Pseudo Doppler Direction Finding System for Localizing Non-Cooperative VHF Transmitters with a Hybrid UAS
Current radio direction finding techniques are limited in flexibility and focus on specific applications. Commercial off the shelf systems exist for a wide range of applications from navigation to search and rescue and wildlife tracking. However these systems rely on commercially available VHF …
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Analysis and Implementation of a Novel Single Channel Direction Finding Algorithm on a Software Radio Platform
A radio direction finding (DF) system is an antenna array and a receiver arranged in a combination to determine the azimuth angle of a distant emitter. Basically, all DF systems derive the emitter location from an initial determination of the angle-of-arrival (AOA). Radio direction finding …
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The Role of Actively Created Doppler shifts in Bats Behavioral Experiments and Biomimetic Reproductions
… motions, bats can encode information on target direction into time-frequency Doppler signatures. These species were thought to be evolutionarily tuned to Doppler shifts generated by a prey's wing beat. Self-generated Doppler shifts from the bat's own flight motion were for the most part …
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An electrically small multi-port loop antenna for direction of arrival estimation
Direction of arrival (DoA) estimation or direction finding (DF) requires multiple sensors to determine the direction from which an incoming signal originates. These antennas are often loops or dipoles oriented in a manner such as to obtain as much information about the incoming signal as possible. …
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Approaches to Multiple-source Localization and Signal Classification
… by which localization is achieved is through direction-finding at each sensor, and in some cases, range estimation as well. Both single and multiple-target scenarios are considered in this research. In single-source environments, a solution that outperforms the classic least squared error …
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Adaptive Antenna Arrays Applied to Position Location
… spatial filtering, position location through direction finding measurements, and developing improved channel models through angle of arrival channel sounding measurements. This thesis provides an overview of the technical challenges involved in position location of wireless users and details …
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