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Project Report ATC-206 Runway Status Light System Demonstration at Logan Airport J. R. Eggert R. J. Sasiela M. P. Kastner W. H. Harman H. Wilhelmsen T. J. Morin H. B. Schultz J. L Sturdy D. Wyschogrod P. M. Daly 12 October 1995 Lincoln Laboratory MASSACHUSETTS INSTITUTE OF TECHNOLOGY LEXINGTON, MASSACHUSETTS Prepared for the Federal Aviation Administration, Washington, D.C. 20591 This document is available to the public through the National Technical Information Service, Springfield, VA 22161 This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or use thereof. TECHNICAL REPORT STANDARD TITLE PAGE 1. Report No. 2. Government Accession No. 3. Recipient·s Catalog No. ATC-206 4. Title and Subtitle 5. Report Date 12 October 1995 Runway Status Light System Demonstration at Logan Airport 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No. J.R. Eggert, R.J. Sasiela, M.P. Kastner, W.H. Harman, H. Wilhelmsen, T.J. Morin, H.B. Schultz, J.L. Sturdy, D. Wyschogrod, and P.M. Daly ATC-206 9. Performing Organization Name and Address 10. Work Unit No. (TAAIS) Lincoln Laboratory, MIT 244 Wood Street 11. Contract or Grant No. Lexington, MA 02173-9108 DTFAOI-95-X-02018 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered Department of Transportation Federal Aviation Administration Washington, DC 20591 14. Sponsoring Agency Code 15. Supplementary Notes This report is based on studies performed at Lincoln Laboratory, a center for research operated by Massachusetts Institute of Technology under Air Force Contract F19628-95-C-0002. 16. Abstract The Runway Status Light System (RSLS), developed under the FAA's Airport Surface Traffic Automation (ASTA) program, is intended to help reduce the incidence of runway incursions and airport surface accidents. It will do so by providing a preventive, back-up system of automatically controlled lights on the airport surface that inform pilots when runways are unsafe for entry or takeoff, and by providing controllers with enhanced surface radar displays. This report documents a proof-of-concept evaluation of the RSLS at Boston's Logan Airport. It details the methods used to provide the necessary surface surveillance and safety logic to allow a computer to operate the runway status lights and associated controller displays without human assistance. The system was installed and tested off-line at Boston's Logan Airport using an inexpensive commercial marine radar as a primary surveillance source. The system operated live and in real time but the runway status lights were not physically installed. They were displayed on a scale model of Logan Airport located in a demonstration room that had a good view of the airport. This allowed visual comparison between the actual aircraft and the resulting lights and displays. In addition to providing a convincing demonstration of the system, real-time viewing of the aircraft movement was an important aid in the development of the surveillance processing and safety logic software. Surveillance perfor mance and runway status light operational performance were evaluated quantitatively. The probability of tracking an aircraft in movement areas with line-of-sight coverage was better than 98%. The false track rate was about four per bour, and the surveillance jitter was about 1 meter rms. From an operational point of view, had there been real lights on the field, it appears that they would have provided the intended safety back-up with little impact on airport capacity or controller and pilot workload. Only once in 15 minutes would the pilot population have ob served a light in an incorrect state for more than four seconds. From the point of view of a specific cockpit crew, only once in 36 operations would a runway status light have been seen in an incorrect state for more than four seconds, and, furthermore, only once in 50 operations would light illuminations have interfered with normal, safe traffic flow. These are encouraging results for a system in an early demonstration phase because significant im provement is possible in all of these performance measures. Specific suggestions for improvement are included in this document. 17. Key Words 18. Distribution Statement Runway Status Light System (RSLS) This document is available to the public through the Airport Surface Traffic Automation (ASTA) National Technical Information Service, Logan Airport Springfield, VA 22161. Airport Surface Detection Equipment-X (ASDE-X) 19. Security Classif. (of this report) 20. Security Classif. (of this page) 21. No. of Pages 22. Price Unclassified Unclassified 285 FORM DOT F 1700.7 (8-72) Reproduction of completed page authorized EXECUTIVESU~ARY INTRODUCTION In the last two decades, at least nine major airport surface conflict accidents have occurred in the United States. In a thirteen-month period in 1990 and 1991, three airport runway conflict accidents together resulted in the loss of 43 lives. Runway conflicts start with runway incursions. About 200 runway incursions occur every year at US airports. With domestic air traffic predicted to increase by 3% annually over the next decade, the airport surface is expected to become increasingly crowded. The runway incursion problem must be addressed if future runway conflict accidents are to be prevented. The Runway Status Light System (RSLS), developed under the FAA-administered research and development program in Airport Surface Traffic Automation (ASTA), is designed to reduce the incidence of runway incursions and airport surface accidents. The RSLS is a preventive, back-up system intended to provide runway status information to pilots via automatically controlled lights on the airport surface .that indicate when particular runways are either unsafe to enter or are unsafe for takeoff. The system will also provide runway status and traffic information to controllers via surface radar display enhancements. The technical approach is to use automatic processing of surface primary and approach secondary radar data to drive the runway-status lights and associated controller surface traffic displays. This report documents a proof-of-concept evaluation of the RSLS at Boston's Logan airport. It details the methods used to provide the necessary surface surveillance and control logic to allow a computer to operate the runway status lights and associated controller displays without human assistance. THE RSLS SOLUTION An important design goal of the RSLS is to enhance airport surface traffic safety with minimum operational impact on air traffic controllers and pilots, and with no reduction in airport capacity. The RSLS operational concepts were devised using extensive knowledge of actual airport operations, drawing on the experience of controllers, pilots, and safety experts. The RSLS is designed to be an all-weather, automatic system providing a safety backup to controllers and pilots, requiring no increase in controller workload, and incurring no decrease in airport capacity. The result of the RSLS design effort is a system that works in concert with existing procedures, and enhances runway safety. Analysis of past runway accidents and incidents has shown that a complete airport surface traffic safety system should include a good surface radar, controller alerts in the tower cab, and runway status lights. A surface radar aids the controller to acquire and maintain a mental image of the present and pending runway operations. Digital display enhancements such as aircraft icons and identification tags on the surface radar display greatly, enhance the display visibility. These enhancements require automatic surveillance processing to provide tracking information. The same tracking information derived for the display enhancements can be used to drive controller alerts and runway status lights. The runway status lights and enhanced surface traffic displays are the chief outputs of the RSLS system. The improved controller surface traffic display, depicted in Figure ES-I, provides controllers with an advanced digital display of airport surface and approach traffic. Aircraft and surface vehicles are depicted by arrows that point in the direction of motion and whose size represents the size of the radar image. Tags provide velocity information and, when available from the Automated Radar Terminal iii System (ARTS) computer, aircraft flight number, equipment type, and altitude. The traffic is depicted on a map of the runways and taxiways. As shown in Figures ES-2 and ES-3, the runway status lights, composed of runway entrance lights and takeoff hold lights, present runway status information to pilots on and near the airport runways. These lights are driven automatically by computer processing of surface and approach radar information. The RSLS software detects the presence and motion of aircraft and surface vehicles on or near the runways, assesses any possible conflicts with other surface traffic, illuminates red runway entrance lights if the runway is unsafe to enter, and illuminates red takeoff hold lights if the runway is unsafe for departure. The runway status lights will have the effect of preventing runway incursions before they happen. They will prevent runway incursions without interfering with normal and safe airport operations. A basic controller alerting capability is included in the RSLS for demonstration purposes. The RSLS safety logic was designed to