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Articles 1 - 18 of 18
Full-Text Articles in Engineering
Historical Development: Acts Program Formulation, Richard Gedney, Ron Schertler, Frank Gargione
Historical Development: Acts Program Formulation, Richard Gedney, Ron Schertler, Frank Gargione
Online Journal of Space Communication
The following material has been extracted from "The Advanced Communications Technology Satellite" book by Richard Gedney, Ron Schertler and Frank Gargione.
Utilizing Software Defined Radios For Increased Bandwidth In Satellite Communications, Brian M. Wright
Utilizing Software Defined Radios For Increased Bandwidth In Satellite Communications, Brian M. Wright
Theses and Dissertations
This research explores the background and future possibilities of using cooperative satellites equipped with Software Defined Radios (SDRs) to combine their bandwidth and increase their signal reliability. Software Defined Radios are a potential solution to realize various software applications that support a reconfigurable and adaptive communication system without altering any hardware devices or features. This benefit, along with others that are offered by SDRs and the ongoing improvements in commercial digital electronics have sparked an interest in developing small satellites for advanced communications. This research effort sets out to prove if a high bandwidth signal can be generated by using …
Exploring New Lagrangian Cyclers To Enhance Science: Communications With Cubesat Technology, Pedro P. Llanos, Abdiel Santos Galindo, John Ford
Exploring New Lagrangian Cyclers To Enhance Science: Communications With Cubesat Technology, Pedro P. Llanos, Abdiel Santos Galindo, John Ford
Pedro J. Llanos (www.AstronauticsLlanos.com)
This paper discusses the opportunities that abound by using the CubeSat technology to travel to and communicate with the International Space Station, explore space, monitor space weather, monitor space debris and perhaps travel to Mars.
High-Sensitivity Phased Arrays For Radio Astronomy And Satellite Communications, Junming Diao
High-Sensitivity Phased Arrays For Radio Astronomy And Satellite Communications, Junming Diao
Theses and Dissertations
Radio astronomy is used to study stars, galaxies, black holes and gas clouds radiation at radio frequencies. Detecting extremely weak signals from deep space radio sources requires high sensitive feed system associated with large dish antennas. The key figure of merit is survey speed, or the time required to map a region of the sky to a given source flux density. Survey speed is proportional to the frequency bandwidth, the field of view or observable region of the sky, and the squared sensitivity, where sensitivity is related to reflector aperture efficiency and system noise temperature. Compared to the traditional single …
Exploring New Lagrangian Cyclers To Enhance Science: Communications With Cubesat Technology, Pedro P. Llanos, Abdiel Santos Galindo, John Ford
Exploring New Lagrangian Cyclers To Enhance Science: Communications With Cubesat Technology, Pedro P. Llanos, Abdiel Santos Galindo, John Ford
Publications
This paper discusses the opportunities that abound by using the CubeSat technology to travel to and communicate with the International Space Station, explore space, monitor space weather, monitor space debris and perhaps travel to Mars.
Design And Analysis Of Receiver Systems In Satellite Communications And Uav Navigation Radar, Matthew Robertson Morin
Design And Analysis Of Receiver Systems In Satellite Communications And Uav Navigation Radar, Matthew Robertson Morin
Theses and Dissertations
The design of a low cost electronically steered array feed (ESAF) is implemented and tested. The ESAF demonstrated satellite tracking capabilities over four degrees. The system was compared to a commercial low-noise block downconverter (LNBF) and was able to receive the signal over a wider angle than the commercial system. Its signal-to-noise ratio (SNR) performance was poor, but a proof of concept for a low cost ESAF used for tracking is demonstrated. Two compact low profile dual circularly polarized (CP) reflector feed antenna designs are also analyzed. One of the designs is a passive antenna dipole array over an electromagnetic …
Passive And Electronically Steered Array Planar Feeds For Satellite Communications, Kyle C. Browning
Passive And Electronically Steered Array Planar Feeds For Satellite Communications, Kyle C. Browning
Theses and Dissertations
As the need for more bandwidth increases, satellite communication (SatCom) terminals are forced to climb higher in frequency. Higher frequency means greater propagation losses, and so antenna gain and sensitivity have to increase. The higher the gain, the more difficult it is to point the antenna. To make matters even more challenging, consumers are requesting satellite links in harsher environments and on moving vehicle and planes. In order to meet today's challenges and improve on dish feeds, research is ongoing to replace fixed-beam feedhorns with smaller, cheaper, and lighter PCB based antennas and to develop low-cost electronically steered array feeds …
Statewide Wireless Communications Project, Volume 3: Data Collection And Signal Processing For Improvement Of Road Profiling And Proof Of Concept Of A Vehicle-Infrastructure Based Road Surface Monitoring Application, J. V. Krogmeier, Darcy M. Bullock
Statewide Wireless Communications Project, Volume 3: Data Collection And Signal Processing For Improvement Of Road Profiling And Proof Of Concept Of A Vehicle-Infrastructure Based Road Surface Monitoring Application, J. V. Krogmeier, Darcy M. Bullock
Darcy M Bullock
The Statewide Wireless Communications Project was an umbrella project intended to support various INDOT activities in the area of wireless communications. As these activities were conducted independently the report for the project is organized into three volumes. Volume 1 contains the results of satellite and cellular communications field testing undertaken in support of INDOT’s SiteManager application. Volume 1 also contains the results of an evaluation of spread spectrum radios for long-range communications. Volume 2 contains the results of detection zone evaluation for loop detection of bicycles and the results of testing algorithms for travel time estimation using vehicle re-identification based …
Statewide Wireless Communications Project, Volume 2: Inductive Loop Detection Of Bicycles And Inductive Loop Signature Processing For Travel Time Estimation, J. Krogmeier, Darcy Bullock
Statewide Wireless Communications Project, Volume 2: Inductive Loop Detection Of Bicycles And Inductive Loop Signature Processing For Travel Time Estimation, J. Krogmeier, Darcy Bullock
Darcy M Bullock
The Statewide Wireless Communications Project was an umbrella project intended to support various INDOT activities in the area of wireless communications. As these activities were conducted independently the report for the project is organized into three volumes. Volume 1 contains the results of satellite and cellular communications field testing undertaken in support of INDOT’s SiteManager application. Volume 1 also contains the results of an evaluation of spread spectrum radios for long-range communications. Volume 2 contains the results of detection zone evaluation for loop detection of bicycles and the results of testing algorithms for travel time estimation using vehicle re-identification based …
Statewide Wireless Communications Project, Volume 1: Communication Field Tests For Satellite, Cellular, And Spread Spectrum Radio, J. V. Krogmeier, Darcy M. Bullock
Statewide Wireless Communications Project, Volume 1: Communication Field Tests For Satellite, Cellular, And Spread Spectrum Radio, J. V. Krogmeier, Darcy M. Bullock
Darcy M Bullock
The Statewide Wireless Communications Project was an umbrella project intended to support various INDOT activities in the area of wireless communications. As these activities were conducted independently the report for the project is organized into three volumes. Volume 1 contains the results of satellite and cellular communications field testing undertaken in support of INDOT’s SiteManager application. Volume 1 also contains the results of an evaluation of spread spectrum radios for long-range communications. Volume 2 contains the results of detection zone evaluation for loop detection of bicycles and the results of testing algorithms for travel time estimation using vehicle re-identification based …
Statewide Wireless Communications Project, Volume 1: Communication Field Tests For Satellite, Cellular, And Spread Spectrum Radio, J. V. Krogmeier, Darcy M. Bullock
Statewide Wireless Communications Project, Volume 1: Communication Field Tests For Satellite, Cellular, And Spread Spectrum Radio, J. V. Krogmeier, Darcy M. Bullock
JTRP Technical Reports
The Statewide Wireless Communications Project was an umbrella project intended to support various INDOT activities in the area of wireless communications. As these activities were conducted independently the report for the project is organized into three volumes. Volume 1 contains the results of satellite and cellular communications field testing undertaken in support of INDOT’s SiteManager application. Volume 1 also contains the results of an evaluation of spread spectrum radios for long-range communications. Volume 2 contains the results of detection zone evaluation for loop detection of bicycles and the results of testing algorithms for travel time estimation using vehicle re-identification based …
Statewide Wireless Communications Project, Volume 3: Data Collection And Signal Processing For Improvement Of Road Profiling And Proof Of Concept Of A Vehicle-Infrastructure Based Road Surface Monitoring Application, J. V. Krogmeier, Darcy M. Bullock
Statewide Wireless Communications Project, Volume 3: Data Collection And Signal Processing For Improvement Of Road Profiling And Proof Of Concept Of A Vehicle-Infrastructure Based Road Surface Monitoring Application, J. V. Krogmeier, Darcy M. Bullock
JTRP Technical Reports
The Statewide Wireless Communications Project was an umbrella project intended to support various INDOT activities in the area of wireless communications. As these activities were conducted independently the report for the project is organized into three volumes. Volume 1 contains the results of satellite and cellular communications field testing undertaken in support of INDOT’s SiteManager application. Volume 1 also contains the results of an evaluation of spread spectrum radios for long-range communications. Volume 2 contains the results of detection zone evaluation for loop detection of bicycles and the results of testing algorithms for travel time estimation using vehicle re-identification based …
Statewide Wireless Communications Project, Volume 2: Inductive Loop Detection Of Bicycles And Inductive Loop Signature Processing For Travel Time Estimation, J. V. Krogmeier, Darcy M. Bullock
Statewide Wireless Communications Project, Volume 2: Inductive Loop Detection Of Bicycles And Inductive Loop Signature Processing For Travel Time Estimation, J. V. Krogmeier, Darcy M. Bullock
JTRP Technical Reports
The Statewide Wireless Communications Project was an umbrella project intended to support various INDOT activities in the area of wireless communications. As these activities were conducted independently the report for the project is organized into three volumes. Volume 1 contains the results of satellite and cellular communications field testing undertaken in support of INDOT’s SiteManager application. Volume 1 also contains the results of an evaluation of spread spectrum radios for long-range communications. Volume 2 contains the results of detection zone evaluation for loop detection of bicycles and the results of testing algorithms for travel time estimation using vehicle re-identification based …
A Performance Analysis Of A Low Earth Orbit Satellite System, Korkut A. Ercakar
A Performance Analysis Of A Low Earth Orbit Satellite System, Korkut A. Ercakar
Theses and Dissertations
This thesis provides a performance analysis of the TELEDESIC® Low Earth Orbit Satellite System. It analyzes the system's performance to meet the real-time communications constraints with a full satellite constellation. Computer simulation results are the sources to evaluate delays associated with packets transmitted from source to destination earth stations. The simulation is run at low, medium and high loading levels with two different, uniform and non-uniform, traffic distributions. The evaluated results are end-to-end packet delays and packet rejection rate. The results show that the TELEDESIC® satellite system network is capable of meeting the real-time communication requirements with delay values much …
A Performance Analysis Of Dynamic Routing Algorithms In An Iridium-Like Low Earth Orbit Satellite System, Stephen R. Pratt
A Performance Analysis Of Dynamic Routing Algorithms In An Iridium-Like Low Earth Orbit Satellite System, Stephen R. Pratt
Theses and Dissertations
This research presents a first of its kind comparative analysis of the Extended Bellman-Ford and Darting algorithms, using the Iridium low earth orbit (LEO) satellite system configuration for the simulation environment. The algorithms are compared to one another via discrete-event computer simulation and evaluated based on their ability to route real-time voice communications under low, medium, and high network loading conditions. The algorithms' ability to meet real-time voice constraints is evaluated with a full and degraded satellite constellation using an algorithmic satellite removal method. The investigation results indicate that both algorithms are suitable for use in a LEO environment and …
Trade-Off Analysis Of Communications Capabilities Of Inter-Satellite Links, Andrew J. Feltman
Trade-Off Analysis Of Communications Capabilities Of Inter-Satellite Links, Andrew J. Feltman
Theses and Dissertations
This thesis designs, develops, and uses software Graphical User Interfaces (GUIs) to analyze the communications capabilities of Radio Frequency (RF) Inter-Satellite Links (ISLs). The GUIs are geared towards analyzing the proposed ISLs of the Discoverer II program, but are general enough to permit analysis of any free-space RF ISLs. Discoverer II is a demonstration program of low-earth orbiting satellites and is primarily focused on satellite-based sensor technology. This thesis shows RF ISLs can meet the program requirement to broadcast the sensor data back to CONUS in near-real-time. The GUIs operate in real-time and explore trade-offs in the communications capability by …
A Comparative Analysis Of The Iridium® And Globalstar® Satellite Transmission Paths, Kenneth E. Crowe
A Comparative Analysis Of The Iridium® And Globalstar® Satellite Transmission Paths, Kenneth E. Crowe
Theses and Dissertations
Globalstar and Iridium will provide valuable global communications assets for business, humanitarian aid and military operations. However, the level of coverage and the quality of the transmission path of these systems are strongly dependent on the latitude of the user and, due to their orbital characteristics, both systems provide reduced levels of coverage at low latitudes. Additionally, the L- and S-Band frequencies utilized by these systems are prone to ionospheric interference at low latitudes. The results of extensive simulation analysis indicate that the Globalstar constellation architecture provides a considerably better transmission path than Iridium's in several important areas, including path …
User Location Determination Strategy In A Low Earth Orbit Satellite Network, Jaehee Lee
User Location Determination Strategy In A Low Earth Orbit Satellite Network, Jaehee Lee
Theses and Dissertations
Recently, many Low Earth Orbit (LEO) satellite systems have been proposed for the purpose of global communication and one of those systems is planned to start the commercial service in 1998. These LEO satellite systems are providing most of current communication services (voice, fax, data, paging, and even real time video service) without any limitation on place and time. However, little is published about their detail system methodology on user tracking and managing schemes. This thesis presents two user location tracking algorithms in a LEO environment. One (Gateway Approach) is the most likely approach under present system proposals, while the …