Publications
A theory for optimal MTI digital signal processing, part II. signal design
Summary
Summary
In Part I of this report the optimum MTI receiver was derived and analyzed for the case in which the radar pulses were emitted from the transmitter equally spaced in time. For typical long range ATC surveillance radars , aliasing of the target and clutter spectra results in detection blind...
Dual lane runway study, interim report, Project 082-421-214
Summary
Summary
An overview of the issues involved in the design of dual lane runways is presented. These issues include: centerline spacing, parallel taxiway, high speed exits, midpoint versus end point crossing, threshold stagger, and departure/arrival runway preference. An interactive graphics simulation was developed on the TX-2 computer. The simulation provides the...
Comparison of immunity to garbling for three candidate modulation schemes for DABS
Summary
Summary
The performance of three candidate modulation schemes for DABS is analyzed in this report and a comparison on the basis of probability of error per bit is made. The three types of modulation are PAM, DPSK, and FSK. The results show that, at a given level of interference and signal-to-noise...
Parallel approach surveillance
Summary
Summary
This report investigates the requirements imposed on a surveillance system for supporting independent approaches to closely spaced parallel runways. Based on a proposed procedure for monitoring aircraft approach paths and controlling deviations from proper approach paths, the required spacing between runway centerlines is derived as a function of surveillance system...
Surveillance aspects of the Advanced Air Traffic Management System
Summary
Summary
Three topics with impact on the performance of Air-to Satellite-to-Ground Systems for Air Traffic Control Surveillance are addressed in detail: 1) vulnerability to intentional jamming; 2) performance degradation due to the multiple access noise which results from uncoordinated aircraft transmissions, and 3) tracking techniques for improved surveillance accuracy and reduced...
Final Report: Transponder Test Program
Summary
Summary
Performance parameters of transponders installed in aircraft were measured to determine their degree of compliance with current specifications. A mobile van was outfitted with electronic test equipment which simulated the transmitter and receiver sections of a ground interrogator and which allowed measurement of transponder parameters. A horn antenna located near...
A theory for optimal MTI digital signal processing, part I. receiver synthesis
Summary
Summary
A classical problem in radar theory is the detection of moving targets in a ground clutter plus receiver noise background. Improvements in clutter rejection have recently been made by replacing analog MTI processors by their digital equivalents as this eliminates many of the problems associated with the maintenance of the...
Interrogation scheduling for the discrete address beacon system
Summary
Summary
This report is an attempt to define the interrogation scheduling problem which arised in the implementation of the discrete address beacon idea. The interfaces of this problem with other parts of the beacon system design are discussed, and several specific algorithms for scheduling are analyzed for arrays and rotating antennas.
An optimum surveillance radar for ATC
Summary
Summary
The role of surveillance radar will change as the evolving ATC system relies more heavily upon cooperative beacons, but radars will still remain as an important system element. Today's radars have major limitations for an automated ATC environment because they report unwanted targets (ground, bird, and weather clutter) and because...
Interim report transponder test program
Summary
Summary
This report covers the work done under the first phase of a continuing program of field tests on ATCRBS transponders. Characteristic transponder parameters were measured to determine their degree of compliance with the current specifications. A mobile van was outfitted with electronic test equipment which simulated the transmitter and receiver...