Publications
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The polygon-ellipse method of data compression of weather maps
Summary
Summary
Providing an accurate picture of the weather conditions in the pilot's area of interest could be a highly useful application for ground-to-air data links. The problem with using data links to transmit weather pictures is the large number of bits required to exactly specify a weather image. To make transmission...
Terminal Weather Message Demonstration at Orlando, FL, Summer 1993
Summary
Summary
A successful demonstration of providing a text-based message via VHF data link (ACARS) was carried out at Orlando, FL during the summer of 1993. Five airlines participated in the three-month demonstration, which included an average of 145 Terminal Weather message requests per day. During a heavily-impacted weather day, a total...
Encoding approaches for data link transmission of weather graphics
Summary
Summary
To provide pilots with necessary information to make informed decisions on the avoidance of hazardous weather and to maintain situational awareness of the weather conditions, the FAA is actively developing the capability to provide real-time graphical weather information to aircraft through the use of bandwidth-limited data links such as Mode...
Mode S beacon system: functional description (revision D)
Summary
Summary
This document provides a functional description of the Mode S Beacon System, a combined secondary surveillance radar (beacon) and ground-air-ground data link system capable of providing the aircraft surveillance and communications necessary to support ATC automation in future traffic environments. Mode S is capable of common-channel interoperation with the current...
Mode S Beacon System: Functional Description (Revision C)
Summary
Summary
This document provides a functional description of the Mode S Beacon Systme, a combined secondary surveillance radar (beacon) and ground-air-ground data link system capable of providing the aircraft surveillance and communications necessary to support ATC automation in future traffic environments. Mode S is capable of common-channel interoperation with the current...
Discrete address beacon system data link
Summary
Summary
The Discrete Address Beacon System (DABS) is a surveillance and communication system for air traffic control. DABS is under development as an evolutionary replacement for the FAA's existing Air Traffic Control Radar Beacon System (ATCRBS) to enhance surveillance and provide a digital data communication capability. Each DABS aircraft recognizes and...
Concept and plan for the development of a weather support subsystem for Air Traffic Control
Summary
Summary
This report summarizes the results of a study to: (1) investigate the primary needs of air traffic controllers, flow controllers, and central flow controllers for weather information, (2) define a cost effective system concept to meet these needs, and (3) lay out a plan for the development of the proposed...
DABS: A System Description
Summary
Summary
The Discrete Address Beacon System (DABS) is a cooperative surveillance and communication system for air traffic control. It employs ground-based sensors (interrogators) and airborne transponders. Ground-to-air and air-to-ground data-link communications are accommodated integrally with the surveillance interrogations and replies. DABS has been designed as an evolutionary replacement for the current...
Morphology of ionospheric scintillation
Summary
Summary
This report is directed toward providing information to communication systems designers first about scintillation as observed in a single experiment, second about the adequacy of the existing models used to interpret scintillation data, and finally about the variation of scintillation with geophysical parameters.
Morphology of ionospheric scintillation
Summary
Summary
Small scale ionospheric irregularities in the F-region can cause fluctuations in the amplitude, phase, and angle of arrival of VHF. UHF, and SHF signals traversing the ionosphere. Under some conditions, the power level fluctuations or scintillations at VHF and UHF may become severe with 12 dB signal level increases and...