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Institution

Mitre Corporation

CompanyBedford, Massachusetts, United States
About: Mitre Corporation is a company organization based out in Bedford, Massachusetts, United States. It is known for research contribution in the topics: Air traffic control & National Airspace System. The organization has 4884 authors who have published 6053 publications receiving 124808 citations. The organization is also known as: Mitre & MITRE.


Papers
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24 Sep 2004
TL;DR: In this article, a statistical method of modeling and accounting for the heavy tail fault-free error distributions that have been encountered in the Local Area Augmentation System (LAAS), the FAA's version of a ground-based augmentation system (GBAS) for GPS.
Abstract: The purpose of this paper is to describe a statistical method of modeling and accounting for the heavy tail fault-free error distributions that have been encountered in the Local Area Augmentation System (LAAS), the FAA’s version of a ground-based augmentation system (GBAS) for GPS. The method uses the Normal Inverse Gaussian (NIG) family of distributions to describe a heaviest tail distribution, and to select a suitable NIG family member as a model distribution based upon a statistical observability criterion applied to the FAA’s LAAS prototype error data. Since the independent sample size of the data is limited to several thousand and the tail probability of interest is of the order of 10-9, there is a chance of mismodeling. A position domain monitor (PDM) is shown to provide significant mitigation of mismodeling, even for the heaviest tail that could be encountered, if it can meet certain stringent accuracy and threshold requirements. Aside from its application to GBAS, this paper should be of general interest because it describes a different approach to navigation error modeling and introduces the application of the NIG distribution to navigation error analysis.

30 citations

Journal ArticleDOI
TL;DR: The results indicate that training users with individual loss messaging might increase the effectiveness of the training, and potential evidence that organizational training can lead to increased overall spear phishing awareness, even for those not directly trained is found.
Abstract: Executives in many industries have fallen prey to socially engineered attacks known as spear phishing. Using highly targeted emails, social engineers trick victims into performing unintended action...

30 citations

Proceedings ArticleDOI
Carl Engelman1
30 Nov 1965
TL;DR: The purpose of MATHLAB is to provide the scientist with computational aid of a much more intimate and liberating nature.
Abstract: A mathematical scientist experiments. Today, his test tube and his breadboard are blackboard and paper. He may, it is true, have available a computer, but its role is numerical and its results are delivered not today, not tomorrow, but the day after the final programming bug is corrected. The computer is not present during the most creative phases of the scientist's labor. The purpose of MATHLAB is to provide the scientist with computational aid of a much more intimate and liberating nature.

30 citations

Journal ArticleDOI
TL;DR: This work uses early-late gate processing on an objective function derived from an adaptive finite impulse response (FIR) filter that attempts to match the crosscorrelation of the received signal with a multipath-free replica of the desired crosscor correlation.
Abstract: New expressions are presented for the multipath-induced pseudorange error (i.e. bias) and variance introduced by multipath onto the time-of-arrival estimate obtained using a noncoherent early-late gate discriminator. The results include the effect of front-end bandwidth and early-late gate spacing. We also investigate a blind method for cancelling the multipath, in order to improve the time-of-arrival estimate. Our approach uses early-late gate processing on an objective function derived from an adaptive finite impulse response (FIR) filter that attempts to match the crosscorrelation of the received signal with a multipath-free replica of the desired crosscorrelation. This method performs reasonably well, and decreases the multipath-induced pseudorange error by approximately a factor of 2, even in very stressing multipath environments.

30 citations

Journal ArticleDOI
R.M. Davis1
TL;DR: In this article, a phase-only gradient-based adaptive algorithm analogous to the least mean square (LMS) algorithm is proposed. But the gradient is obtained by cross-correlating binary perturbation sequences that are applied to the adaptive phases, with the resulting instantaneous output power or voltage.
Abstract: The author defines a phase-only gradient-based adaptive algorithm analogous to the least mean square (LMS) algorithm. Two phase-only perturbation algorithms are then defined. It is shown that the gradient for the perturbation algorithms can be obtained by cross-correlating binary perturbation sequences, that are applied to the adaptive phases, with the resulting instantaneous output power or voltage. It is also shown that a single set of phase-only adaptive weights can be used to simultaneously null interference in multiple output beams. Simulation results are presented for all of the new algorithms. The phase-only perturbation techniques eliminate the need for element level receivers and support low cost retrofitting of adaptive nulling on phased arrays by using conventional beamsteering circuits to apply the adaptive weights.

30 citations


Authors

Showing all 4896 results

NameH-indexPapersCitations
Sushil Jajodia10166435556
Myles R. Allen8229532668
Barbara Liskov7620425026
Alfred D. Steinberg7429520974
Peter T. Cummings6952118942
Vincent H. Crespi6328720347
Michael J. Pazzani6218328036
David Goldhaber-Gordon5819215709
Yeshaiahu Fainman5764814661
Jonathan Anderson5719510349
Limsoon Wong5536713524
Chris Clifton5416011501
Paul Ward5240812400
Richard M. Fujimoto5229013584
Bhavani Thuraisingham5256310562
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20234
202210
202195
2020139
2019145
2018132