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 87 for “"Frequency Modulated"”.
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Frequency-modulated continuous-wave radar processing fundamentals
… and angular position of targets using a frequency-modulated continuous-wave (FMCW) radar. FMCW radars have applications such as collision detection and assisted cruise control in modern vehicles, due to their ability to be manufactured as low-power, single-chip systems. We will discuss …
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A hybrid frequency modulated CDMA communication system
… combines the low cost and flexibility of analog frequency modulation with the capacity and multipath advantages of a Code Division Multiple Access (CDMA) system. This system aims to provide WLL telephone services at low cost, with wireline grade voice quality, fast infrastructure deployment and …
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Frequency modulated analog fiber optic links using direct detection
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Performance Evaluation of a Frequency Modulated Spread-Spectrum System
Analog frequency modulated (FM) systems offer advantages of reliable speech quality and simplicity, whereas code division multiple access (CDMA) systems promise high capacity, resistance to multipath fading, and simplified frequency planning. In this thesis, we investigate the performance of a …
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Frequency Modulated Continuous Wave Radar Based Fall Risk Monitoring System
… approach to assessing fall risk using a frequency-modulated continuous-wave (FMCW) radar system, addressing the need for frequent, low-cost, longterm balance monitoring solutions. This technology is compared with ground-truth contactbased lab sensors like force plates and motion capture …
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Path Following using Frequency Modulated Continuous Wave millimetre-wave Automotive Radar
… a path planning algorithm developed to only use Frequency Modulated Continuous Wave (FMCW) radar. Radar has shown to be semi-invariant to inclement weather such as snow, fog, extremely lighting conditions, and heavy rain. Traditionally, autonomous vehicle (AV) path planning algorithms use …
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The capture of the weaker of two co-channel frequency-modulated signals
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1960.
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The Development of an Independent Frequency Modulated Continuous Wave Radar for Perimeter Security
The accessibility of Frequency Modulated Continuous Wave (FMCW) radars has provided several diverse industries with a microwave sensor that can be utilized reliably for many different applications. The research specified in this thesis focuses primarily on the perimeter security industry with the …
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A Frequency-Modulated Continuous Wave-Based Boundary Detection System in a Small PCB Profile
… room.</p> <p>The work presented in the paper, “A Frequency-Modulated Continuous Wave-Based Boundary Detection System for Determination of Monitoring Region for an Indoor Ultra-Wideband Short Range Radar-Based Eldercare Monitoring System” has determined that a frequency modulated continuous wave …
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Design of an Ultra-Wideband Frequency-Modulated Continuous Wave Short Range Radar System for Extending Independent Living
… contact others and seek assistance. The proposed frequency modulated continuous wave (FMCW) short range radar (SRR) system, which uses ultra-wideband (UWB) signals can provide immediate assistance by monitoring and detecting fall events. The unique characteristics of this system allow for a …
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The perceived urgency and detection time of multi-tone and frequency-modulated warning signals in broadband noise
… multitone simultaneous, and rising sawtooth frequency-modulated pulse formats), pulse level (65 dBC and 79 dBC), and time between pulses (0 ms, 150 ms, and 300 ms). The environments of interest were those settings with steady-state broadband machinery noise. Conditions included a loading task …
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An analysis of threshold characteristics of quasi-linearized phase-locked loop demodulation for wideband frequency-modulated signals
An analytical threshold criterion in approximation has been developed for the basic phase-locked loop demodulator utilizing quasi-linearization technique. The analysis is based on assumptions that the loop is excited by an input FM signal and additive white Gaussian noise. This paper defines the …
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RF Front End for an Integrated Silhouette Capture and Boundary Detection Frequency Modulated Continuous Wave Ultra-Wideband Radar System for the Extension of Independent Living
… new solutions. A monitoring system based on a frequency modulated continuous wave ultra-wideband short-range radar is proposed for this application. The complete proposed monitoring system is comprised of four blocks: boundary detection, silhouette capture, human identification, and data …
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A Frequency-Modulated Continuous Wave-Based Boundary Detection System for Determination of Monitoring Region for an Indoor Ultra-Wideband Short Range Radar-Based Eldercare Monitoring System
… angle with ultra-wideband is presented.</p> <p>A frequency modulated continuous wave (FMCW) based system is an acceptable solution for boundary detection. A FMCW system measures distance with UWB signals. With the addition of a unique reflector, the system is able to identify the reflector via the …
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Stepped-frequency pulse train waveforms for improved radar range resolution
… improving radar range 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 …
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Investigation of the role of the nucleus accumbens in amphetamine-induced 50 kHz ultrasonic vocalizations in the rat
… accumbens is associated with generation of frequency modulated 50 kHz calls (a specific type of 50 kHz call which can be subdivided into various subtypes). There is also evidence that amphetamine administered systemically preferentially increases the proportion of trill and step calls …
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FMCW RFID backscatter localization
… localization and motion tracking using radio-frequency identification (RFID) tags. In this thesis, we explore a one-shot radio-frequency identification based localization and motion tracking approach with high accuracy, low latency, and whose cost is much lower than the current …
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A study of the effects of linear networks on FM waves
The analysis of the distortion which results when frequency-modulated waves are passed through linear networks is investigated by the Fourier method and the Quasi-steady-state method. The major enphasis is placed on the Fourier method, and extensive digital computer programs are developed to allow …
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Electrode length measurement in electric arc furnaces
… measurement system based on a conventional frequency modulated continuous wave (FMCW) radar presented the most feasible technique. In this system, microwaves are propagated down a waveguide placed in the electrode. As the waveguide melts, they continue propagating in the resulting cavity …
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