Real-time Simulation: Physical Layer Model of FAA's Universal Access Transceiver

M.A. Nguyen (USA)


Universal Access Transceiver, UAT,FAA, Simulink, L-band


The Federal Aviation Administration (FAA), Department of Defense (DoD), and international civil aviation authorities are concerned that the expanded use of communication systems operating in the 960-1215 megahertz (MHz) band poses a potential threat of increased mutual radio frequency interference (RFI) among government systems, and harmful out-of-band interference from commercial systems. The MITRE Corporation’s Center for Advanced Aviation System Development (CAASD) believes that an effective way to analyze and understand the various aspects of this problem is through the development of a software tool suite that can be used to emulate the various systems, environments, and mitigation strategies. The success of this modeling task will help the government to make more decisions regarding the use of the L-band and design future systems. A potential new system being considered by the FAA that operates on a frequency within the 960-1215 MHz band is the Universal Access Transceiver (UAT). This system has been selected for detailed analysis as the first step toward developing a comprehensive tool suite to accurately model communication systems. The FAA is considering using UAT as a platform for future data broadcasting services. The UAT is a digital radio system supporting three broadcast data services: Automatic Dependent Surveillance-Broadcast (ADS-B), Traffic Information Services (TIS-B), and Flight Information Services (FIS-B). This paper describes the application of the commercial off-the-shelf product Simulink, by MathWorks, Inc., to model the UAT system. The model focuses on the physical layer of UAT, mainly signal generation, cyclic redundancy coding (CRC), NOTICE This work was produced for the U.S. Government under Contract DTFA01-01-C-0001 and is subject to Federal Aviation Administration Acquisition Management System Clause 3.5-13, Rights In Data-General, Alt. III and Alt.IV (Oct., 1996). The content of this document reflect the views of the author and The MITRE Corporation and od not necessarily reflect the views of the FAA or the DOT. Neither the Federal Aviation Administration nor the Department of Transportation makes any warranty or guarantee, expressed or implied, concerning the content or accuracy of these views. © 2002 The MITRE Corporation Reed-Solomon (RS) forward-error coding (FEC), and Continuous Frequency Shift Keying (FSK) modulation and demodulation schemes. Both air-ground and air-air communication links are accounted for in the constructed model. The results show that the simulated UAT performance is in reasonable agreement with the prototype UAT for equipment validation and is compliant with UAT Minimum Operational Performance Standards (MOPS) requirements.

Important Links:

Go Back