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The development of the IFF MARK X (SIF) Air Traffic Control Radar Beacon System Performance Prediction Model (ATCRBS PPM) is described. This model provides performance predictions of the entire system or of selected subsystems. Military, civilian, or mixed equipment deployments for any geographic location can be considered. Actual, postulated, or future interrogator and aircraft deployments can be studied to determine system or equipment effectiveness. Deployments can include an unlimited number of aircraft (transponders) operating at altitudes up to 80,000 feet and distributed over an unlimited geographical area.
The Discrete Address Beacon System (DABS) is to be gradually phased into the existing Air Traffic Control Radar Beacon System (ATCRBS) in the 1980's. The DABS selective address feature is designed to alleviate the ATCRBS problems of over-interrogation and synchronous garble. The FAA requested that the Electromagnetic Compatibility Analysis Center (ECAC) develop a computer model with the capability to predict mutual interference arising in a mixed secondary-surveillance radar environment. The nature of the DABS interrogation schedule required that the model be a time-event store simulation. The model inputs are selected from the ECAC data base and consist of the characteristics of a ground and air deployment of sensors and transponders. Detailed characteristics of a sensor-of-interest (So) are among the inputs. The model output is primarily a record of the events that were predicted to occur during a simulation period. The performance of each transponder is described by its reply history during the time in which the equipped aircraft is in the So mainbeam. The fruit rate at the So is predicted, and the performance of the subject sensor is represented by the results of DABS transactions and ATCRBS target evaluations. Other summary outputs are available from the model, including interrogation rates, sidelobe suppression rates, and the identity of equipments that cause observable interference. (Author).

OT Report

United States. Department of Commerce. Office of Telecommunications

Published: 1977

Total Pages: 924


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This is one of a series of studies evaluating the occurrence of excessive interrogation signals ('hot spots') within air traffic control sectors supervised by the Air Traffic Control Beacon System (ATCRBS) of the Federal Aviation Administration. On-site observations of air traffic displays are discussed, and the analyses of the air traffic electromagnetic environments using performance prediction model techniques are described. (Author).