Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Electromagnetics and Photonics (3)
- Other Electrical and Computer Engineering (2)
- Systems and Communications (2)
- Atmospheric Sciences (1)
- Civil and Environmental Engineering (1)
-
- Computer Engineering (1)
- Digital Communications and Networking (1)
- Meteorology (1)
- Oceanography and Atmospheric Sciences and Meteorology (1)
- Operations Research, Systems Engineering and Industrial Engineering (1)
- Other Civil and Environmental Engineering (1)
- Physical Sciences and Mathematics (1)
- Systems Engineering (1)
- Keyword
-
- Angle-of-Arrival (1)
- Atmospheric Turbulence (1)
- Autoscope (1)
- Computer vision (1)
- DEM (1)
-
- FM-CW (1)
- FOPAIR (1)
- Histogram of oriented gradients (1)
- I/Q Imbalance (1)
- Interferogram (1)
- Inversion (1)
- Ocean (1)
- Optical Wave Propagation (1)
- Pedestrian counting (1)
- Pedestrian detection (1)
- Physical Layer Security (1)
- Physical layer (1)
- Radar (1)
- Radar Interferometry (1)
- Sea spikes (1)
- Security (1)
- Slope-at-Zero-Lag (1)
- Time-Delay-to-Peak (1)
- Topography (1)
- Transportation planning (1)
- UWB (1)
- Wind Estimation (1)
- Wireless (1)
Articles 1 - 6 of 6
Full-Text Articles in Signal Processing
Wireless Physical-Layer Security Performance Of Uwb Systems, Miyong Ko
Wireless Physical-Layer Security Performance Of Uwb Systems, Miyong Ko
Masters Theses 1911 - February 2014
Traditionally, spread-spectrum systems have been employed to provide low probability-of-intercept (LPI) and low probability-of-detection (LPD) performances at the physical layer, but the messages transmitted over such a system are still encrypted with a powerful cipher to protect their secrecy. Our challenge is to find a solution to provide an additional level of security at the physical layer so that simple systems such as RFID tags with limited resources can be secure without using standard encryption. It has recently been suggested that the cryptographic security of the system can be enhanced by exploiting physical properties of UWB signals. With an eavesdropper …
On The Retrieval Of The Beam Transverse Wind Velocity Using Angles Of Arrival From Spatially Separated Light Sources, Shiril Tichkule
On The Retrieval Of The Beam Transverse Wind Velocity Using Angles Of Arrival From Spatially Separated Light Sources, Shiril Tichkule
Masters Theses 1911 - February 2014
For optical propagation through the turbulent atmosphere, the angle of arrival (AOA) cross-correlation function obtained from two spatially separated light sources carries information regarding the transverse wind velocity averaged along the propagation path. Two methods for the retrieval of the beam transverse horizontal wind velocity, v_t, based on the estimation of the time delay to the peak and the slope at zero lag of the AOA cross-correlation function, are presented. Data collected over a two week long experimental campaign conducted at the Boulder Atmospheric Observatory (BAO) site near Erie, CO was analyzed. The RMS difference between 10 s estimates of …
Inversion Of Marine Radar Imagery To Surface Realizations And Dual-Polarization Analysis, Brian Paulsen
Inversion Of Marine Radar Imagery To Surface Realizations And Dual-Polarization Analysis, Brian Paulsen
Masters Theses 1911 - February 2014
The ocean influences global weather patterns, stores and transports heat, and supports entire ecosystems. An area of interest is the relationship between the observed backscattered power received by a surface-based marine radar and the ocean surface topography. Current methods for obtaining surface elevation maps involve either in situ devices, which only provide point measurements, or an interferometric radar, which can be costly. During the late 1990's and early 2000's a radar was built at UMass, called the Focused Phased Array Imaging Radar II (FOPAIR II), and deployed at a several locations. A method is discussed to determine a transfer function …
Addressing/Exploiting Transceiver Imperfections In Wireless Communication Systems, Lihao Wang
Addressing/Exploiting Transceiver Imperfections In Wireless Communication Systems, Lihao Wang
Masters Theses 1911 - February 2014
This thesis consists of two research projects on wireless communication systems. In the first project, we propose a fast inphase and quadrature (I/Q) imbalance compensation technique for the analog quadrature modulators in direct conversion transmitters. The method needs no training sequence, no extra background data gathering process and no prior perfect knowledge of the envelope detector characteristics. In contrast to previous approaches, it uses points from both the linear and predictable nonlinear regions of the envelope detector to hasten convergence. We provide a least mean square (LMS) version and demonstrate that the quadrature modulator compensator converges.
In the second project, …
Automated Detection And Counting Of Pedestrians On An Urban Roadside, Gayatri D. Prabhu
Automated Detection And Counting Of Pedestrians On An Urban Roadside, Gayatri D. Prabhu
Masters Theses 1911 - February 2014
This thesis implements an automated system that counts pedestrians with 85% accuracy. Two approaches have been considered and evaluated in terms of count accuracy, cost and ease of deployment. The first approach employs the Autoscope Solo Terra, a traffic camera which is widely used to monitor vehicular traffic. The Solo Terra supports an image processing-based detector that counts the number of objects crossing user-defined areas in the captured image. The count is updated based on the amount of movement across the selected regions. Therefore, a second approach has been considered that uses a histogram of oriented gradients (HoG), an advanced …
Development, Deployment, And Characterization Of A Ku-Band Interferometer, Anthony Swochak
Development, Deployment, And Characterization Of A Ku-Band Interferometer, Anthony Swochak
Masters Theses 1911 - February 2014
Space-borne radar interferometry provides a global vantage point to understand climate change, global weather phenomenon, and other Earth dynamics. For climate change observations, space-borne interferometers can be utilized to relate ocean topography to temperature, thus providing a global map of ocean temperatures. Since the oceans are in constant motion, a single-pass interferometer is needed to successfully make these measurements of ocean height. The feasibility of a single-pass measurement is dependent on the physical size of the instrument, hence it is cheaper and more practical to launch a small, light weight instrument into space. Since instrument size scales inversely with operating …