Aerospace Engineering Commons^™

Overview: The View From 22,300 Miles High, David Hartshorn

Online Journal of Space Communication

Asia's geography, claiming many of the world's highest peaks, has provided a dramatic setting for a climbing expedition that began decades ago, when the satellite communications community took its first step on the lower slopes of the mountain.

Overview: Politics And Technology Converge: Case Studies On The Effects Of Regulatory Reform On Vsat Adoption In Developing Countries, Emmanuel Adugu, Kwasi Boateng, D. Flournoy, Eric Gavua, Wencelous Kaswoswe, Miao Zhang

Online Journal of Space Communication

Developing countries are actively implementing satellite data networks, and have undertaken policy reforms to facilitate such networks. This research examines how regulatory changes have resulted in the removal of barriers relating to the deployment of access technologies and growth in connectivity, especially in VSAT installations for low cost Internet access. In addition, this research seeks to identify the socio-economic impact of emerging data network applications in government, business, health and education. In some cases, government offices have been the driver of change; in other cases, businesses have been the ones to initiate and press these developments forward.

Overview: Pipelines Of The Skies, Errol Olivier

Online Journal of Space Communication

Advances in fixed satellite technology are enabling oil and gas concerns to enhance the efficiency of offshore operations with cost-effective voice and data network solutions.

Issue 7: From The Guest Editors, David Hartshorn, Martin Jarrold

Online Journal of Space Communication

During the past 15 years, the international satellite communications industry has been developing and refining network solutions such that today, there are more than one million so-called Very Small Aperture Terminal (VSAT) systems installed and operating in more than 120 countries.

Space And Defense – Volume Twelve – Number One – Winter 2021, Space And Defense Journal

Space and Defense

No abstract provided.

Fluid-Structure Interaction Of Nrel 5-Mw Wind Turbine, Mohamed Sayed Elkady Abd-Elhay

Theses and Dissertations

Wind energy is considered one of the major sources of renewable energy. Nowadays, wind turbine blades could exceed 100 m to maximize the generated power and minimize produced energy cost. Due to the enormous size of the wind turbines, the blades are subjected to failure by aerodynamics loads or instability issues. Also, the gravitational and centrifugal loads affect the wind turbine design because of the huge mass of the blades. Accordingly, wind turbine simulation became efficient in blade design to reduce the cost of its manufacturing. The fluid-structure interaction (FSI) is considered an effective way to study the turbine's behavior …

Transport-Based Pattern Recognition Versus Deep Neural Networks In Underwater Oam Communications, Patrick L. Neary, Jonathan M. Nichols, Abbie T. Watnik, K. Peter Judd, Gustavo K. Rohde, James R. Lindle, Nicholas S. Flann

Space Dynamics Laboratory Publications

Comparisons between machine learning and optimal transport-based approaches in classifying images are made in underwater orbital angular momentum (OAM) communications. A model is derived that justifies optimal transport for use in attenuated water environments. OAM pattern demultiplexing is performed using optimal transport and deep neural networks and compared to each other. Additionally, some of the complications introduced by signal attenuation are highlighted. The Radon cumulative distribution transform (R-CDT) is applied to OAM patterns to transform them to a linear subspace. The original OAM images and the R-CDT transformed patterns are used in several classification algorithms, and results are compared. The …

Satellite Security And Performance In An Era Of Dual Use, Joseph N. Pelton

Online Journal of Space Communication

Since the mid-1990s the U.S. Government and military forces have placed more and more reliance on commercial satellite systems for military communications of a non-tactical nature. Requirements such as the U.S. Armed Forces Radio and Television require a great deal of bandwidth but do not require any special security protection. Further there are many other forms of communications involving national security or defense systems where a varying degree of security is required. Many of these applications do not require a very high level of "top secret" protection since these communications do involve tactical, strategic or highly classified messages. For instance, …

International Guidelines For The Preservation Of Space As A Unique Resource, Phillip D. Anz-Meador

Online Journal of Space Communication

n/a

Overview: Satellite Signal Security: Copyright Protection Korean Dbs Content And Transaction Security, Don Flournoy

Online Journal of Space Communication

As a result of new developments in broadband communication, residential users, office workers and those who move from place to place have more ways to access the programming and services they want when they want them.

Space-Based Offensive Weapons: Have Policymakers Discussed This Enough?, Kathleen M. Sweet

Online Journal of Space Communication

Arguably, one of the most significant global security policy debates of the 21st century is whether the United States and more specifically the Bush Administration should develop and deploy space-based weaponry. The age of space is upon us. But how convinced is the rest of America, the West and potential adversaries of the legitimate need to do so? For almost half a century, the world's space powers have abstained from deploying such weapons as basic unwritten policy. To date, the military has been limited to surveillance, navigation and communications satellites

Overview: Space Security: Possible Issues And Potential Solutions, Ziad I. Akir

Online Journal of Space Communication

Space communication has become an integral component of our overall global telecommunication infrastructure. Satellites are being used for telecommunication, business, entertainment, education, Internet, navigation, remote sensing, imaging, and weather forecasting.

Satellites are also providing backup communication capabilities when terrestrial communication is interrupted in cases such as earthquakes or other natural (or unnatural) disasters. The September 11th events in 2001 demonstrated the value of redundant satellite systems in supporting rescue efforts.

Overview: The Increasing Threat To Satellite Communications, Sean Patrick Bain

Online Journal of Space Communication

Communication security has been a priority since the beginning of recorded history. The survival of human cultures has always relied on the use of accurate information transported over distances. The interception of this information, preventing its reception or its misuse, can alter the course of nations. As technology advances, so too does the threat to modern satellite communication. The methods of interfering with or intercepting satellite signals are numerous and need to be better understood.

As has been demonstrated by a small team of undergraduate students, the capability to intercept the nation's communication satellite signals is no longer limited to …

Issue 6: From The Guest Editor, Kathleen Sweet

Online Journal of Space Communication

Guest editor introduction.

Structural Reform For It Competitiveness In Japan, Kei Hata

Online Journal of Space Communication

Five years ago, in order to publicize the necessity for the Japanese government to have an Information Technology policy that until then was largely ignored, as a member of the House of Counselors of the Japanese Diet, I created an urgent proposal and presented it to Prime Minister Hashimoto.

Issue 5: Contributors, Bruce Elbert

Online Journal of Space Communication

List of issue 5 contributors.

Bridging The Digital Divide: Towards A New Paradigm, Virgil Labrador

Online Journal of Space Communication

My direct experience in the "digital divide" was when I was marketing director for a band-new state-of-the-art program origination and satellite transmission facility in Singapore seven years ago in 1996. Our first and anchor client was the highly successful Discovery Network--which housed in our facility the first all-digital channel to the Asia-Pacific market.

Bridge Over Troubled Skies: Satellite Broadband And The Digital Divide, Phillip L. Spector

Online Journal of Space Communication

A few years ago, at the height of the Internet boom, pundits often spoke of "Internet time." They meant many things by this reference, but certainly there was a recognition that a key strength of the Internet is the fast communications speeds involved. While the concept of "Internet time" has faded somewhat with the bloom on the Internet rose, it is still the case that ever-increasing numbers of Americans and others in the world have access to high-speed Internet services. Through this access, they are able to refer quickly to a myriad of resources that have made the Internet an …

The Digital Divide… Teach A Man To Fish!, Vince Waterson

Online Journal of Space Communication

Recently Kim Hak-Su, Executive Secretary of the United Nations Economic and Social Commission for Asia and the Pacific (UNESCAP) that co-organized the regional conference together with the Japanese Government and other collaborators, acknowledged that more work is needed. "The Tokyo Declaration is directional", he said. "We need more meetings".

Strengthening Access To Communications Policy & Regulatory Guidelines For Satellite Services, David Hartshorn

Online Journal of Space Communication

This work is designed to help bridge the "Regulatory Divide" that continues to thwart end users' efforts to obtain affordable communications. From tele-medicine to distance learning to rural telecenters to disaster recovery to enterprise networks, the satellite industry is offering not only telecommunications solutions for the "have nots", but also the regulatory tools to enable the public sector to fulfill their policy objectives.