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 174 for “"radars"”.
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Random phase codes for Doppler weather radars
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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X-band Doppler simulator for sport projectile radars
… This is a common problem with evaluating Doppler radars as well, since the inherent property of a Doppler radar is to measure the radial velocity of objects in motion like aircraft or projectiles. A common solution to this problem is to perform a hardware- in-the-loop (HIL) simulation. This …
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Atmospheric propagation effects on heterodyne-reception optical radars
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1982.
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Adaptive optics for large aperture coherent laser radars
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
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Operational Use of Specific Differential Phase Shift in Dual Polarization Radars
Specific differential phase shift is one of three new base products that have become available to operational weather forecasters since the WSR-88D upgrades were completed in May 2013. Though most often used as a component in quantitative precipitation estimates, this research focused on …
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Phase-based soil moisture sensing using radars and passive backscatter tags
Soil moisture sensing is important to optimize water usage in agriculture and fire prevention. In agriculture, it enables smart irrigation systems to use water efficiently, reduce wastage, and enhance crop yields. For fire prevention, accurate soil moisture data improves estimates of fuel moisture …
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Operational Scheduling of Deep Space Radars for Resident Space Object Surveillance
… and debris. However, currently the system of radars used by the Department of Defense to track objects in deep space operates in a way that is labor intensive, uncoordinated, and inefficient. In this thesis, we address these issues by automating and coordinating the radar scheduling process. …
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Quantization noise in a digital signal processor for synthetic aperture radars.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1973. M.S.
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Investigating the use of interval algebra to schedule mechanically steered multistatic radars
… and effectively. Scheduling of multistatic radars was identified as a promising research area, as it builds upon prior research into monostatic and bistatic radars in South Africa. The hypothesis can be validated by answering three research questions. Can IA allow a multistatic radar system …
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Development and Optimization of Airborne FMCW Radars for High-Resolution Snow Depth Measurements
Over one-sixth of Earth's population relies on glaciers and seasonal snowpacks for freshwater supply. In the United States, the Colorado River Basin (CRB) gets 75% of its water from snow melt; it constitutes the water supply of 40 million people in seven states, two countries, and 5.5 million …
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An examination of ionospheric plasma irregularities detected by the mid-latitude SuperDARN radars
The data from the new mid-latitude radars of the Super Dual Auroral Radar Network (SuperDARN) provide new types of challenges and observations. We have developed a method for identifying periods of ionospheric backscatter that increase the number of data and reduce the average velocity in agreement …
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Dynamics of the geomagnetically disturbed ionosphere as measured by GPS receivers and SuperDARN HF radars
… by Super Dual Auroral Radar Network (SuperDARN) radars. We present the first observations of a recurrent region of anomalous enhanced TEC at mid-latitudes over North America and attempt to characterize its frequency of occurrence. Next, we examine the relationship of convection electric fields to …
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Occurrence Statistics and Driving Mechanisms of Ionospheric Ultra-Low Frequency Waves Observed by SuperDARN Radars
… high frequency (HF: 3-30 MHz) coherent scatter radars at middle to polar latitudes that look into Earth's upper atmosphere and ionosphere. In this study, we use Doppler velocity measurements obtained by the SuperDARN radars and coordinated spacecraft observations to investigate the occurrence …
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A study of interhemispheric magnetic conjugacy and large scale magnetosphere-ionosphere coupling using SuperDARN radars
… of ionospheric convection made by the SuperDARN radars to investigate the role of interhemispheric magnetic conjugacy in magnetosphere-ionosphere coupling and study the large-scale interactions between the magnetosphere and ionosphere. SuperDARN radars cover large geographic regions in both …
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The study and real-time implementation of attenuation correction for X-band dual-polarization weather radars
Attenuation of electromagnetic radiation due to rain or other wet hydrometeors along the propagation path has been studied extensively in the radar meteorology community. Recently, use of short range dual-polarization X-band radar systems has gained momentum due to lower system cost compared with …
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Cross validation of observations from the GPM dual-frequency precipitation radar and dual-polarization S-band ground radars
… Satellite with dual polarization S-Band Ground Radars. The GPM mission is a joint venture by the NASA and the JAXA. The radar on board the core observatory is a dual-frequency precipitation radar (DPR) capable of simultaneously operating at 13.6 GHz (Ku band) and 35.5 GHz (Ka band). The DPR is …
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An historical, theoretical and experimental study of the broadband antenna problem with application to short pulse probing radars
The influence of finite radiating elements on the transmission and reception of large instantaneous bandwidth signals is considered. A description of simple broadband radiators is given together with a detailed explanation of both frequency independent and travelling wave phenomena as applied to …
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