scholarly journals Tighter Air Control

2002 ◽  
Vol 124 (07) ◽  
pp. 38-41
Author(s):  
John A. Andersen ◽  
Stephen D. Fulton ◽  
John H. Andersen
Keyword(s):  
Traffic Management ◽  
First Generation ◽  
Modern Technology ◽  
Pressure Vessels ◽  
Civil Aviation ◽  
International Service ◽  
The Pacific ◽  
Management Concept ◽  
Global Communications ◽  
Air Control

This article focuses on an engineered system that uses the advantages of available modern technology, including Global Positioning System satellites, inertial reference systems, flight management systems (specialized computers), and autopilots. More than a decade ago, 85 member states of the International Civil Aviation Organization endorsed a global Communications, Navigation, Surveillance, and Automated Traffic Management concept. This concept, called Future Air Navigation System II, advocates a change from terrestrial-based technology to space-based technology and digital communication. Extensive use is made of satellites for both navigation and communication. In 1995, the first-generation system was placed in use over the Pacific, where aircraft were out of range of the older radio control systems for lengthy time periods. Perhaps the evolution in aviation technology has parallels in the past, when ASME codes for safe boilers and pressure vessels, as well as elevators and escalators were voluntarily adopted and, eventually, legislated into practice. Aviation is a vital national and international service. Problems of safety and efficient use of assets require solution.

scholarly journals Collaborative Solutions for Interference Management in GNSS-Based Aircraft Navigation

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4085
Author(s):  
Mario Nicola ◽  
Gianluca Falco ◽  
Ruben Morales Ferre ◽  
Elena-Simona Lohan ◽  
Alberto de la Fuente ◽  
...  
Keyword(s):  
Traffic Control ◽  
Traffic Management ◽  
Interference Management ◽  
Field Tests ◽  
Air Traffic ◽  
Global Navigation Satellite Systems ◽  
Civil Aviation ◽  
Exploratory Research ◽  
Satellite Systems ◽  
Management Concept

Nowadays, the Global Navigation Satellite Systems (GNSS) technology is not the primary means of navigation for civil aviation and Air Traffic Control, but its role is increasing. Consequently, the vulnerabilities of GNSSs to Radio Frequency Interference, including the dangerous intentional sources of interference (i.e., jamming and spoofing), raise concerns and special attention also in the aviation field. This panorama urges for figuring out effective solutions able to cope with GNSS interference and preserve safety of operations. In the frame of a Single European Sky Air traffic management Research (SESAR) Exploratory Research initiative, a novel, effective, and affordable concept of GNSS interference management for civil aviation has been developed. This new interference management concept is able to raise early warnings to the on-board navigation system about the detection of interfering signals and their classification, and then to estimate the Direction of Arrival (DoA) of the source of interference allowing the adoption of appropriate countermeasures against the individuated source. This paper describes the interference management concept and presents the on-field tests which allowed for assessing the reached level of performance and confirmed the applicability of this approach to the aviation applications.

The state of the art and operational scenarios for urban air mobility with unmanned aircraft

2021 ◽  
pp. 1-30
Author(s):  
F. D. Maia ◽  
J. M. Lourenço da Saúde
Keyword(s):  
Traffic Management ◽  
State Of The Art ◽  
Unmanned Aircraft ◽  
Unmanned Aircraft Systems ◽  
Civil Aviation ◽  
Management Systems ◽  
Urban Air ◽  
Aircraft Systems ◽  
Starting Point ◽  
Standards And Regulations

ABSTRACT A state-of-the-art review of all the developments, standards and regulations associated with the use of major unmanned aircraft systems under development is presented. Requirements and constraints are identified by evaluating technologies specific to urban air mobility, considering equivalent levels of safety required by current and future civil aviation standards. Strategies, technologies and lessons learnt from remotely piloted aviation and novel unmanned traffic management systems are taken as the starting point to assess operational scenarios for autonomous urban air mobility.

scholarly journals Co-Operative Air Traffic Management: Concept and Transition

2005 ◽  
Author(s):  
Thomas Prevot ◽  
Todd Callantine ◽  
Paul Lee ◽  
Joey Mercer ◽  
Vernol Battiste ◽  
...  
Keyword(s):  
Traffic Management ◽  
Air Traffic Management ◽  
Air Traffic ◽  
Management Concept

scholarly journals Space Traffic Management (STM) – Legal Aspects

2021 ◽  
Vol 50 (1) ◽  
pp. 1-11
Author(s):  
Małgorzata Polkowska ◽  
Keyword(s):  
Traffic Management ◽  
Outer Space ◽  
Air Traffic Management ◽  
Legal Aspects ◽  
Air Traffic ◽  
Civil Aviation ◽  
International Civil Aviation Organization ◽  
Definition Of ◽  
Security Regulations ◽  
Space Activities

Space Traffic Management (STM) is a new concept referring to space activities. The highest priority is the safety and security of outer space and all conducted operations. There is no definition of STM. There is an urgent need to regulate STM providing safety and security regulations at the international, regional, and national levels. Because there is no STM definition, the regulator might use the example of existing regulations of the International Civil Aviation Organization on Air Traffic Management (ATM). European EUSST is a good example of being a “precursor” of STM. However, many questions are still open regarding specific regulations needed to create an STM system, such as at which level they should be made: globally, regionally, or nationally.

scholarly journals Ongoing production of low-fitness hybrids limits range overlap between divergent cryptic species

2021 ◽  
Author(s):  
Else K. Mikkelsen ◽  
Darren Irwin
Keyword(s):  
First Generation ◽  
Sex Chromosome ◽  
Genomic Variation ◽  
F1 Hybrids ◽  
The Pacific ◽  
Species Pairs ◽  
Genetic Clusters ◽  
Range Overlap ◽  
Female Specific

AbstractContact zones between recently-diverged taxa provide opportunities to examine the causes of reproductive isolation and to examine the processes that determine whether two species can coexist over a broad region. The Pacific Wren (Troglodytes pacificus) and the Winter Wren (Troglodytes hiemalis) are two morphologically similar songbird species that started diverging about 4 million years ago, older than most sister species pairs. The ranges of these species come into narrow contact in western Canada, where the two species remain distinct in sympatry. To assess evidence for differentiation, hybridization, and introgression in this system, we examined variation in over 250,000 single nucleotide polymorphism markers distributed across the genomes of the two species. The two species formed highly divergent genetic clusters, consistent with long-term differentiation. In a set of 75 individuals from allopatry and sympatry, two first-generation hybrids (i.e., F1’s) were detected, indicating only moderate levels of assortative mating between these taxa. We found no recent backcrosses or F2’s or other evidence of recent breeding success of F1 hybrids, indicating very low or zero fitness of F1 hybrids. Examination of genomic variation shows evidence for only a single backcrossing event in the distant past. The sizeable rate of hybridization combined with very low fitness of F1 hybrids is expected to result in a population sink in the contact zone, largely explaining the narrow overlap of the two species. If such dynamics are common in nature, they could explain the narrow range overlap often observed between pairs of closely related species. Additionally, we present evidence for a rare duplication of a large chromosomal segment from an autosome to the W chromosome, the female-specific sex chromosome in birds.

Okinawa, 1972–1995: Life That Matters

Alegal ◽  
2018 ◽  
pp. 124-142
Author(s):  
Annmaria M. Shimabuku
Keyword(s):  
Large Scale ◽  
First Generation ◽  
Mixed Race ◽  
The State ◽  
Self Determination ◽  
Sex Industry ◽  
Philosophical Concept ◽  
The Pacific ◽  
Global World

This chapter examines the post-reversion era from 1972 to 1995. Along with reversion came the enforcement of the anti-prostitution law and the demise of Okinawa’s large-scale sex industry. The first generation of mixed-race individuals came of age and started speaking for themselves instead of allowing themselves to be spoken for. This was also a time when Okinawans started to look past the unfulfilled promises of the Japanese state for liberation and to conceptualize different forms of autonomy in the global world. This chapter reconsiders self-determination as a philosophical concept. In place of the imperative for a unified self and unified nation as the precondition for entry into selfhood and nationhood (i.e., the capacity for “self-determination”), this chapter revisits Matsushima Chōgi’s concept of the “Okinawan proletariat” to rethink the theoretical implications of Okinawa, as a borderland of the Pacific, where humans and non-human objects circulate. It appeals to Tosaka’s anti-idealist attempt to assign a different kind of agency to morphing matter and reads Tanaka Midori’s mixed-race memoir, My Distant Specter of a Father, for an example of a life that fails to unify before the state, but nonetheless continues to matter or be significant in the quality of its mutability.

Introduction

2021 ◽  
pp. 1-9
Author(s):  
Crawford Gribben
Keyword(s):  
Pacific Northwest ◽  
Old Testament ◽  
Cultural Change ◽  
First Generation ◽  
Political Movements ◽  
The Pacific ◽  
The World ◽  
Christian Reconstruction ◽  
Christian Influence ◽  
Northern Idaho

The Introduction describes the revitalization of one of the most controversial religious and political movements in recent American history. During a period of significant demographic and cultural change, a large number of religious and political conservatives have migrated into the Pacific Northwest. Many of these migrants are influenced by the claims of Christian Reconstruction, or “theonomy.” From their base in northern Idaho, these latter-day theonomists are developing the work of R. J. Rushdoony, Gary North, and others of the first generation of the writers of Christian Reconstruction, reiterating their optimistic view of the future, an eschatological position known as postmillennialism, as well as their expectation that the expansion of Christian influence around the world will be marked by changes in government and by a widespread return to the demands of Old Testament law.

Conclusion

2021 ◽  
pp. 136-150
Author(s):  
Crawford Gribben
Keyword(s):  
Pacific Northwest ◽  
Mass Culture ◽  
First Generation ◽  
Political Strategies ◽  
Top Down ◽  
Marketplace Of Ideas ◽  
Moral Majority ◽  
Religious Conservatism ◽  
The Pacific ◽  
Over Time

Paradoxically, the failure of the first generation of Christian Reconstructionists to cohere, either personally or ideologically, has worked in the movement’s favor, creating an internal marketplace of ideas by means of which competing groupings within political and religious conservatism have been able to appropriate and adopt their central arguments. Recognizing that a “moral majority” does not exist, and therefore abandoning the top-down political strategies of earlier evangelicals, the believers who participate in the migration to the Pacific Northwest work to build communities that will expand organically and over time to renew America and to replace the supposed neutrality of its legislative base. The project is working. But it is not clear whether the integrity of these ideas will continue as their audience base grows. Mass culture routinizes what was once regarded as radical, with effects that may not easily be predicted at the “end of white, Christian America.”

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