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 155 for “"ChIRP"”.
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A comparison of Chirp Diversity and Pulse Doppler Radar
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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A Novel Chirp Slope Keying Modulation Scheme for Underwater Communication
A digital modulation method using Chirp-Slope Keying (CSK) is developed for coherent underwater acoustic communications. Effective signal detection is a critical stage in the implementation of any communications system; we will see that CSK solves some significant challenges to reliable detection. …
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An Underwater Channel Model and Chirp Slope Keying Modulation Scheme Performance
Chirp-Slope Keying (CSK) is a new and innovative digital modulation scheme for underwater data transmission. The underwater environment brings up several challenges to the manufacturing and operation of communication systems. This thesis shows through analysis and simulations the effectiveness of …
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Computationally Efficient Methods for Detection and Localization of a Chirp Signal
In this thesis, a computationally efficient method for detecting a whistle and capturing it using a 4 microphone array is proposed. Furthermore, methods are developed to efficiently process the data captured from all the microphones to estimate the direction of the sound source. The accuracy, the …
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Chirp compensation in active mode-locked semiconductor diode laser using a DFB
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Chiffchaffs chirp and cherries are real: a scientifically informed defence of wholehearted emergentism
In this thesis, I provide a scientifically informed defence of metaphysical emergence, the idea that some systems are metaphysically distinct from their constituent parts and possess properties that are not reducible to their parts’ properties. Moreover, I argue that metaphysical emergence is …
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Absolute electrical impedance tomography and spectroscopy: an Orthogonal Chirp Division Multiplexed (OCDM) approach
… In this thesis, the concept of Orthogonal Chirp Division Multiplexed aEITS (OCDM-aEITS) is introduced as an alternative multiplexing technique. OCDM-aEITS allows the simultaneous application of orthogonal wideband chirp current waveforms at all stimulation electrodes, while measuring the …
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Characterization of the head-related transfer function using chirp and maximum length sequence excitation signals
Both chirp (or sweep) and maximum length sequence (MLS) excitation signals are used to obtain measurements of the head-related transfer function (HRTF) for the Knowles electronic manikin for acoustic research (KEMAR), resulting in remarkably low relative error between the two measurement methods. …
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Performance evaluation of chirp spread spectrum system and Land Mobile Satellite System by computer simulation
… were separately performed for a spread spectrum chirp system as an analog communications system, and for the Land Mobile Satellite System (LMSS) channel as a digital communications system. For the simulation of analog communications, a spread spectrum system using chirp techniques called ‘Coded …
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Investigation and development of a novel metrology standard for the measurement of relative intensity noise and frequency chirp of DFB lasers in optical networks
… attenuation are reported. Frequency excursion (chirp) metrology capabilities have been explored, developed and demonstrated. The final system is based on the gated delayed self homodyning interferometer. Inclusion of Faraday rotating mirrors has been reported showing favourable results, reducing …
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Auditory brainstem and middle-latency responses with optimized stimuli: experiments and models
… the development and evaluation of an optimized (chirp) stimulus based on the concept of compensation for travel time differences along the basilar membrane. In Ch. 2 it is shown that, due to inclusion of activity from lower-frequency regions, the chirp evokes significantly larger ABR amplitude …
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COMPARISON ON DIFFERENT DISCRETE FRACTIONAL FOURIER TRANSFORM (DFRFT) APPROACHES
… properties and non-stationary features of linear chirp signals in the Fourier transform domain, several methods of extraction and parameter estimation for chirp signals are proposed, and a comparative study has been done on chirp signal estimation. Computation of the discrete fractional Fourier …
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The acoustic imaging, reconstruction and characterization of buried archaeological material
… to determine the vertical resolution of the Chirp sub-bottom profiler, the<br/>source used throughout this thesis. The horizontal resolution, on the other hand, was determined by<br/>modelling the directivity pattern of an array of Chirp transducers. The results were then used to<br/>choose a …
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Deep structure ultrasound imaging using fundamental and third harmonic coded excitation techniques
… coding with fundamental and third harmonic 1, 3 chirps with resolution enhancement compression (REC) and frequency compounding, increases the axial resolution, lateral resolution, penetration depth and the contrast-to-noise ratio (CNR) for an ultrasonic imaging system. The thickness mode of …
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Interferometric Synthetic Aperture Sonar Signal Processing for Autonomous Underwater Vehicles Operating Shallow Water
… existing techniques comes from the fusion of Chirp-Scaling a phase preserving beamforming techniques to form a SAS image, an interferometric Vernier method to unwrap the phase; and confirming the direction of arrival with the MUltiple SIgnal Channel (MUSIC) estimation technique. The fusion of …
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Stepped-frequency pulse train waveforms for improved radar range resolution
… resolution using a linear frequency modulated chirp signal requires the full width of the frequency spectrum, which is not feasible in the UHF band due to interference or frequency allocation for other purposes. In this study a linear frequency modulated chirp signal is approximated using two …
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Microfluidics for low input epigenomic analysis and application to oncology and brain neuroscience
… tools to conduct low input ChIP-seq and ChIRP-seq. We applied them to a variety of samples profiling different targets. The native MOWChIP-seq platform was developed to map RNA polymerase II, transcription factors and histone deacetylase binding in 1,000-50,000 cells. We examined mouse …
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Dynamic Analysis of Semi-Active Control Techniques for Vehicle Applications
… under three different base excitations: chirp, step, and pure tone. Corresponding to the chirp input, transmissibilities and auto spectrums are considered for each control policy. Specifically, transmissibilities between the sprung mass displacement and the unsprung mass displacement are …
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High harmonic generation by short laser pulses: time-frequency behavior and applications to attophysics
… the time-dependent instantaneous frequency (chirp) of high harmonics. The harmonic chirp is a direct consequence of the atom-field interaction during HHG, and its behavior in the time-frequency domain reveals the fundamental physics in the strong laser field. In addition, controlling the …
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