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Full-Text Articles in Engineering
Square Spiral Conformal Microstrip Antennas For Space Vehicles, Nahid Dehestani
Square Spiral Conformal Microstrip Antennas For Space Vehicles, Nahid Dehestani
HIM 1990-2015
The research deals with the experimental study of square spiral microstrip antennas over the 5 to 12 GHz range. Square spiral microstrip antennas can provide a wideband reception at frequencies of several gigaHertz. They can, like other microstrip antennas be made conformal and are compact and light weight. Consequently, they are very suitable for use on aircraft and spacecraft. These antennas can be flush mounted to the existing surfaces, and their shape makes them easier to fabricate, and can be mass-produced. The square spiral microstrip antenna is a recent development and has been investigated theoretically through the use of the …
Numerical, Image, And Signal Processing Algorithms Applied To Radar Rainfall Estimation, John Eugene Lane
Numerical, Image, And Signal Processing Algorithms Applied To Radar Rainfall Estimation, John Eugene Lane
Retrospective Theses and Dissertations
Since the advent of radar in the 1940s, it has been well known that water drops composing precipitation scatter microwaves in a predictable manner. This characteristic of early. radar has lead to the present day Weather Surveillance Radar (WSR-88D) or NEXRAD systems, operated by the National Weather Service (NWS). In parallel to the evolution of weather radar for measuring precipitation over large areas, remote networks of rain gauges have been deployed and managed by agencies such as the Florida Water Management Districts. Since the recent deployment of the NWS network of WSR-88D, as well as the recent launch of the …
Development And Saw Device Implementation Of A New Weighted Stepped Chirp Code Signal For Direct Sequence Spread Spectrum Communications Systems, Scott Edward Carter
Development And Saw Device Implementation Of A New Weighted Stepped Chirp Code Signal For Direct Sequence Spread Spectrum Communications Systems, Scott Edward Carter
Retrospective Theses and Dissertations
This work introduces the new weighted stepped chirp code signal for direct sequence spread spectrum (DS/SS) communications systems. This code signal uses the truncated cosine series functions as the chip functions. This code signal is the result of discretizing a continuous wave (CW) chirp which results in enhanced performance versus a pseudonoise (PN) code and equivalent performance and easier implementation than a CW chirp. This code signal will be shown to possess improved compression ratio (CR), peak sidelobe level (PSL), integrated sidelobe level (ISL), and bit error rate (BER) when compared to a PN code of identical code length and …