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The FAA is currently developing the Discrete Address Beacon System (DABS) as an evolutionary upgrading of the Air Traffic Control Radar Beacon System (ATCRBS). DABS will provide improved surveillance and data link service to suitably equipped aircraft operating on the same ATCRBS frequencies. Questions in response to the publication of the proposed DABS National Standard in the Federal Register in March 1978 have been raised regarding the potential interference to ATCRBS because of common channel usage. The purpose of this document is to present the assumptions, models and system operation necessary to assess the potential interference effects of DABS on ATCRBS. The conclusion of the analysis presented herein is that the current ATCRBS surveillance ability will not be degraded as a result of implementing DABS. (Author).
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).
A computer analysis was conducted to investigate the effect of the proposed Discrete Address Beacon System (DABS) on the Air Traffic Control Radar Beacon System (ATCRBS) in a future (1982) Los Angeles, CA, air traffic environment. The performance of ATCRBS was examined at two sites, both with (a) the existing all-ATCRBS ground environment and (b) a mixed ATCRBS/DABS ground environment (using various levels of DABS channel activity). It was observed that, in general, DABS operations will not affect the ability of ATCRBS interrogators to perform their air traffic control function of reliably detecting aircraft. (Author).
Test of the Discrete Address Beacon System (DABS) in an Automated Radar Terminal System (ARTS III) environment were conducted at this Center (NAFEC). To date, surveillance performance has been tested in evaluation areas of track swap, track initiation, and track loss, Surveillance related communications, including Common International Civil Aviation Organization Data Interchange Network protocol, have also been tested. Initial tests were conducted using the Air Traffic Control Simulation Facility to generate simulated DABS and Air Traffic Control Radar Beacon System (ATCRBS) targets. Results of test in both surveillance and surveillance--related communications have proven compatibility between DABS and the modified ARTS. To introduce the actual DABS sensor into the testing, the Aircraft Reply Interference and Environment Simulator (ARIES) was used to simulate aircraft replies from DABS and ATCRBS transponders. The replies were processed by DABS to generate DABS to generate DABS and ATCRBS target reports and transmitted to the Air Traffic Control facilities. Results of these tests showed that surveillance performance did not vary significantly from that of the earlier tests. More testing of the surveillance-related communications functions using ARIES/DABS inputs will be required before performance in this area can be adequately characterized. Since this is an interim report, some of the reported results are of a preliminary nature and have raised questions which are being investigated further.
This report describes the subsystem interrogator and processor tests conducted by the Federal Aviation Administration (FAA) Technical Center on the engineering laboratory model of the Discrete Address Beacon System (DABS). These tests were conducted to determine the performance of the multichannel receiver and the Air Traffic Control Radar Beacon System (ATCRBS) and DABS processors. These performance test results supplement the functional subsystem testing performed by Texas Instruments, Incorporated during the factory tests. The results of the receiver tests were used to determine the operating parameters and performance of the monopulse receiver and the operating characteristics of the video quantizer. The ATCRBS reply processor tests identified the static performance and characteristics of the variable parameters in this unit. The DABS reply processor tests defined the performance of the critical elements in the DABS processor. These elements were the video digitizer, the message bit and monopulse processing, and the error detection and correction. Identification and optimization of the characteristics of the variable parameters of this unit were determined. It was concluded that the subsystems tested met the requirements specified in the DABS engineering requirement (ER) FAA-ER-240-26. (Author).
This report describes the test procedures and results of the Discrete Address Beacon System (DABS) and Air Traffic Control Radar Beacon System (ATCRBS) compatibility studies performed at the Federal Aviation Administration (FAA) Technical Center. Four terminal ATCRBS processors: Automated Radar Terminal System (ARTS III), ARTS IIIA Sensor Receiver and Processor (SRAP), ARTS II, an AN/TPX-42, and the en route common digitizer were subjected to various anticipated DABS/ATCRBS asynchronous reply (fruit) environments. Maximum expected DABS fruit rates will not degrade performance of facilities using defruited video. The common digitizer, which does not employ a defruiter, performed with no significant degradation in the various DABS fruit environments. The SRAP, which is planned to be implemented interminal facilities to replace the existing ARTS III Beacon Data Acquisition Subsystem (BDAS), will experience overloading of reply and report buffers by the addition of DABS fruit if a defruiter is not used. A defruiter eliminates the overload conditions to the expected maximum DABS fruit rate but adversely affects the SRAP performance.