Publications
The Aircraft Reply and Interference Environment Simulator (ARIES), volume 2: appendices to the principles of operation
Summary
Summary
The Aircraft Reply and Interference Environment Simulator (ARIES) makes possible the performance assessment of a Discrete Address Beacon System (DABS) sensor under its specified maximum aircraft load. To do this ARIES operates upon a taped traffic model to generate simulated aircraft replies and fruit, feeding them to the sensor at...
Uplink ATCRBS environment measurements along the Boston-Washington corridor, volume 2: interrogator characteristics
Summary
Summary
Airborne measurements of the Air Traffic Control Radar Beacon System (ATCRBS) 1030 MHz uplink environment due to ATC ground interrogators are described. The measurements were made using a special purpose airborne sensor-recorder during a flight from Boston to Washington (at 8500 feet) and back (at 17,500 feet) on 16 December...
Automated tracking for aircraft surveillance radar systems
Summary
Summary
An improved moving target detector (MTD) (a digital signal processor) has been designed, constructed, and tested which successfully rejects all forms of radar clutter while providing reliable detection of all aircraft within the coverage of the radar. The MTD is being tested on both terminal and enroute surveillance radars for...
Airborne measurements of ATCRBS fruit
Summary
Summary
Airborne measurements of ATCRBS fruit (asynchronous replies from ATCRBS transponders) are described. These measurements were undertaken to provide a more firm basis for assessing the interference impact of ATCRBS fruit on airborne 1090 MHz receivers (as in BCAS). Fruit rate measurements were performed with an instrumented aircraft flying along the...
A phrase recognizer using syllable-based acoustic measurements
Summary
Summary
A system for the recognition of spoken phrases is described. The recognizer assumes that the input utterance contains one of a known set of allowable phrases, which may be spoken within a longer carrier sentence. Analysis is performed on a syllable-by-syllable basis with only the strong syllables considered in the...
Uplink ATCRBS environment measurements along the Boston-Washington Corridor, volume 1: the RF environment
Summary
Summary
Airborne measurements of the Air Traffic Control Radar Beacon System (ATCRBS) 1030 MHz uplink environment due to ATC ground interrogators are described. The measurements were made using a special purpose airborne sensor-recorder during a flight from Boston to Washington (at 8500 feet) and back (at 17,500 feet) on 16 December...
Variance and spectra of angle-of-arrival and Doppler fluctuations caused by ionospheric scintillation
Summary
Summary
The variance and spectra of angle-of-arrival and Doppler fluctuations were estimated by using 150- and 400-MHz transmissions from the low-orbiting U.S. Navy navigation satellites observed at the Millstone Hill radar facility. A theoretical model for the variance and spectra was also constructed by using the Rytov approximation and a power...
IPC design validation and flight testing final report
Summary
Summary
A series of flight tests were conducted to evaluate the collision avoidance system known as Intermittent Positive Control (subsequently re-named Automatic Traffic Advisory and Resolution Service, ATARS). These tests involved both professional test pilots and subject pilots selected from the aviation community. This report includes analysis of the collision avoidance...
Simulation of surveillance and processing algorithms proposed for the DABS mode of BCAS
Summary
Summary
Surveillance Processing Algorithms for the DABS Mode of BCAS have been implemented in software for the non-real time processing of air-to-air link data. The data to be processed may be either AMF recorded air-to-air data, or data derived from simulated flight encounters. Examples of simulation trials for a specific collision...
Automating radars for air traffic control
Summary
Summary
Developments in digital signal processing over the past few years have improved the detection and false alarm properties of air surveillance radars to such an extent that automatic radar tracking of all aircraft within the radar's coverage volume has become a reality. This paper derives the radar requirements to support...