Surveillance Monitoring of Parallel Precision Approaches in a Free Flight Environment

The FAA is conducting evaluations of Precision Runway Monitoring (PRM) surveillance techniques. This paper describes the evaluation results of the Multilateration/ADS-B system trials conducted at Atlanta-Hartsfield International Airport (ATL) in 1997. The performance of Time Difference of Arrival (TDOA) position multilateration of aircraft Mode S and Mode A/C transmissions was evaluated, in addition to the system's capability to support 1090 MHz ADS-B. The paper provides a system overview and presents preliminary coverage, accuracy and update rate results.