Publications
Supporting the deployment of the Terminal Doppler Weather Radar (TDWR)
Summary
Summary
The Terminal Doppler Weather Radar (TDWR) program was initiated in the mid-1 980s to develop a reliable automated Doppler-radar-based system for detecting weather hazards in the airport terminal area and for providing warnings that will help pilots avoid these hazards when landing and departing. This article describes refinements made to...
The Integrated Terminal Weather System (ITWS)
Summary
Summary
The Integrated Terminal Weather System (ITWS) is one of two major development projects sponsored by the FMs Aviation Weather Development Program. Focused on the environment within the airport terminal area, ITWS integrates data from FAA and National Weather Service (NWS) sensors and systems to provide a suite of weather informational...
Implementation of the 1992 Terminal Area-Local Analysis and Prediction System (T-LAPS)
Summary
Summary
The Integrated Terminal Weather System (ITWS) development program was initiated by the Federal Aviation Administration (FAA) to produce a fully automated, integrated terminal weather information system to improve the safety, efficiency and capacity of terminal area aviation operations. The ITWS will acquire data from FAA and National Weather Service (NWS)...
Large population speaker recognition using wideband and telephone speech
Summary
Summary
The two largest factors affecting automatic speaker identification performance are the size of the population to be distinguished among and the degradations introduced by noisy communication channels (e.g. telephone transmission). To experimentally examine these two factors, this paper presents text-independent speaker identification results for varying speaker population sizes up to...
Documentation of 9-PAC Beacon Target Detector processing function
Summary
Summary
This project report documents the algorithms and flow of the Beacon Target Detector (BTD) processing function incorporated as part of the ASR-9 Processor Augmentation Card (9-PAC). The BTD function combines replies that arise from the same aircraft to form beacon targets, and sends these beacon targets to the 9-PAC merge...
Solid state radar demonstration test results at the FAA technical center
Summary
Summary
In 1992 and 1993 ITT Gilfillan teamed with Thomson CSF to develop a solid state transmitter system for airport surveillance radar applications. Because of the low peak power limitations of the solid state transmitter, the radar uses pulse compression techniques to obtain 55 nmi detection performance. In the Fall of...
Airport surface surveillance using differential GPS and the Mode S data link
Summary
Summary
A new concept for providing surface surveillance of aircraft and ground vehicles has recently been tested at Hanscom Field in Bedford, Massachusetts. This concept, known as GPS-Squitter, combines the capabilities of differential GPS for navigation with those of the Mode S data link for communications. Together these systems provide accurate...
Demonstration of GPS Automatic Dependent Surveillance of aircraft using spontaneous Mode S broadcast messages
Summary
Summary
A new Automatic Dependent Surveillance (ADS) system concept combining GPS-based positions with Mode S data communications is described. Several potential applications of this concept are presented with emphasis on surface surveillance at airports. The navigation and data link performance are analyzed. Compact ADS position formats are included. The results of...
ITWS and the NWS forecaster: what is the connection?
Summary
Summary
The Federal Aviation Administration (FAA) is sponsoring the development of the Integrated Terminal Weather System (ITWS), which is designed to acquire all of the weather data that is available in the terminal area, both ground-based and aircraft sensed, and to provide short-term (0 to 30-minute) predictions of microbursts, wind shear...
An automated method for low level wind shear alert system (LLWAS) data quality analysis
Summary
Summary
The Low Level Windshear Alert System (LLWAS) is an anemometer-based surface network used for detection of hazardous wind shear and acquisition of operational wind information in the airport terminal area. The quality of wind data provided by the LLWAS anemometers is important for the proper performance of the LLWAS wind...