Publications
Verification of DABS sensor surveillance performance (ATCRBS Mode) at typical ASR sites throughout CONUS
Summary
Summary
A Transportable Measurement Facility (TMF) incorporating antenna, r-f, and reply processing elements of a Discrete Address Beacon System (DABS) sensor has been sited at, and in the vicinity of, several FAA terminal ASR's throughout the United States. Data collected at these sites have been thoroughly analyzed to verify the design...
Uplink coverage measurements in the Los Angeles Area for passive BCAS
Summary
Summary
Uplink (1030 MHz) measurement results are presented, based on data recorded by the Airborne Measurement Facility of the M.I.T. Lincoln Laboratory during normal landings and take-offs at the LAX, Van Nuys, and San Diego airports. The data presented are relevant to current investigations of passive beacon-based collision avoidance systems and...
Proposed technical characteristics for the Discrete Address Beacon System (DABS)
Summary
Summary
This report parallels the Proposed U. S. National Aviation Standard for the Discrete Address Beacon System. However, in addition to the material contained in the Proposed Standard this document provides a more detailed performance specification for the DABS transponder including specifications on transponder receiver sensitivity and performance in interference. It...
A hardware implementation of the ATCRBS reply processor used in DABS
Summary
Summary
A special-purpose digital hardware processor, which implements the ATCRBS Reply Processing algorithms designed for use in the Discrete Address Beacon System (DABS) has been developed and used in two DABS-related programs. This report gives a detailed functional description of this processor as implemented by Lincoln Laboratory. With minor modifications it...
L-Band air-to-air multipath measurements
Summary
Summary
A series of air-to-air earth-scattered L-Band multipath measurements are described and experimental results presented. During these measurements RF pulses were transmitted between two instrumented general aviation aircraft flying coaltitude, diverging paths over a variety of terrain and water surfaces. Multipath data was collected over grazing angles ranging from ~5?? to...
Interferometer design for elevation angle estimation
Summary
Summary
Radars that are developed for the purpose of monitoring aircraft landings in the terminal air traffic control system can be designed to exploit the relatively high signal-to-noise ratio that characterizes the power budgets calculated for such a link. An interferometer using a pair of low gain antennas can be used...
DABS coverage
Summary
Summary
DABS sensors are to be installed at FAA ASR and ARSR sites throughout continental U.S. as a part of the evolutionary upgrading of the third generation ATC Radar Beacon System (ATCRBS). It is therefore important to establish: (1) the degree of 3D coverage which would be provided by such deployment...
Airborne radars for surveillance and weapon delivery
Summary
Summary
Airborne radars such as AW ACS capable of large area surveillance of aircraft over both land and sea have become a reality in the past few years. Soon to follow are radars capable of large area surveillance of moving ground traffic. Through their ability to accurately report enemy movement and...
Coaxial magnetron spectra and instabilities
Summary
Summary
Application of advanced radar clutter rejection techniques to FAA airport surveillance and enroute radars is constrained by inherent instabilities and spectral properties of the device used with the radar transmitter to generate high level RF pulse energy, and the degree to which its spectrum can be influenced by the circuit...
Advanced signal processing for airport surveillance radars
Summary
Summary
The inclusion of airport surveillance radars (ASR) in an automated air traffic control system, such as the ARTS-III, has been limited by the present radar's capability to automatically reject ground clutter, weather clutter and angels while still maintaining good detectability on all aircraft within their coverage patterns. Analytical and experimental...