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Functional inputs to passive correlation detectors for oscillatory transient signals

IEEE JOURNAL OF OCEANIC ENGINEERING 1999年第1期24卷 67-80页

作者： Pflug, LA Ioup, GE Ioup, JW USN Res Lab Ocean Acoust Branch Stennis Space Ctr MS 39529 USA Univ New Orleans Dept Phys New Orleans LA 70148 USA

This research investigates whether passive detection of transient signals can be improved by replacing received signals with functionals of the received signals in correlation detectors, Specifically, this paper assesses the impact of using energy spectrum and autocorrelation functional inputs to the crosscorrelation (energy), bicorrelation, and tricorrelation detectors. Test signals with differing autocorrelation and energy spectrum properties are used in computer simulations with independent Gaussian noise to evaluate detector performance. Detection results are presented for the case when only two channels of input data are available to form the correlations, as well as the case when three and four channels of input data are available to form the higher order correlations. In the former case, it is shown that detection performance can be improved for the narrow-band signals by using the energy spectrum and autocorrelation functional inputs rather than the original received signal. In the latter case, it is shown that detection performance can be improved by using the autocorrelation input for the broadband signal and the energy spectrum input for the narrow-band signals, and that the tricorrelation detector performs best for the signals tested.

关键词： correlation detectors detection higher order statistics passive detectors transients

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Analysis of correlation and FACCD detectors in the strong-signal region

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Telecommunications and Radio Engineering (English translation of Elektrosvyaz and Radiotekhnika) 1995年第8期49卷 26-32页

作者： Tuzlukov, V.P.

This paper makes a comparative analysis of the results of an experimental investigation of two types of detectors for a signal-to-interference voltage ratio of 7.96 dB at the input;the signal detection attributes of s... 详细信息

关键词： correlation detectors

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detectors correlation factor of broadband measurements used in automotive EMC

Detectors correlation factor of broadband measurements used ...

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IEEE Symposium on Electromagnetic Compatibility

作者： Rakouth, Heritianarisoa Hozeska, Robert Cammin, Clane Delphi Automot Syst Saginaw Steering Syst Saginaw MI 48601 USA

ISBN: (纸本)9781424402939

Current CISPR12 broadband test limits are based on a 20 dB correlation factor between peak and quasi-peak measurements at 120 kHz bandwidth. This value is based on the experimental data accumulated in several countries. Electricthybrid vehicle power handling technologies produce new types of impulsive noise that call for a review of the current correlation factor. This document provides analytical insight on the empirical 20 dB correlation factor. Recommendations accounting for the new power technologies are given at the end of the paper.

关键词： correlation detectors

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Measuring photon correlation using imperfect detectors

arXiv

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arXiv 2024年

作者： Clark, Rachel N. Bishop, Sam G. Cannon, Joseph K. Hadden, John P. Dolan, Philip R. Sinclair, Alastair G. Bennett, Anthony J. School of Engineering Cardiff University Queen’s Building The Parade CardiffCF24 3AA United Kingdom Translational Research Hub Maindy Road CardiffCF24 4HQ United Kingdom National Physical Laboratory Hampton Road TeddingtonTW11 0LW United Kingdom

Single-photon detectors are "blind" after the detection of a photon, and thereafter display a characteristic recovery in efficiency, during which the number of undetected photons depends on the statistics of the incident light. We show how the efficiency-recovery, photon statistics and intensity have an interdependent relationship which suppresses a detector’s ability to count photons and measure correlations. We also demonstrate this effect with an experiment using n such detectors to determine the nth order correlation function with pseudothermal light. © 2024, CC BY.

关键词： correlation detectors

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Influence of laser pulse on the autocorrelation function of H in a strong electric field

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Chinese Optics Letters 2009年第1期7卷 1-4页

作者：王立飞杨光参 School of Physics and Electronic Information Wenzhou University

The autocorrelation function of electronic wave packet of hydrogen atom in a strong electric field below the zero-field ionization threshold is investigated in the formalism of semiclassical theory. It is found that the autocorrelation depends on the applied laser pulse significantly. In the case of narrow laser pulse, the reviving peaks in the autocorrelation can be attributed to the closed orbits of electrons, which are related to the classical dynamics of the system. But this correspondence is wiped out with increasing the laser width because of the interference among the adjacent reviving peaks.

关键词： correlation detectors Electric field effects Electric fields Hydrogen Laser beams Laser pulses Lasers Photolithography Probability density function Programming theory Regression analysis

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Inferring Aftershock Sequence Properties and Tectonic Structure Using Empirical Signal detectors

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PURE AND APPLIED GEOPHYSICS 2015年第2期172卷 359-373页

作者： Junek, William N. Kvaerna, Tormod Pirli, Myrto Schweitzer, Johannes Harris, David B. Dodge, Douglas A. Woods, Mark T. Patrick AF Base AF Tech Applicat Ctr Brevard FL USA NORSAR Kjeller Norway Deschutes Signal Proc Maupin OR USA Lawrence Livermore Natl Lab Livermore CA USA

Seismotectonic studies of the 2008 Storfjorden aftershock sequence were limited to data acquired by the permanent, but sparse, regional seismic network in the Svalbard archipelago. Storfjorden's remote location and harsh polar environment inhibited deployment of temporary seismometers that would have improved observations of sequence events. The lack of good station coverage prevented the detection and computation of hypocenter locations of many low magnitude events (mb < 2.5) in the NORSAR analyst-reviewed bulletin. As a result, the fine structure of the sequence's space-time distribution was not captured. In this study, an autonomous event detection and clustering framework is employed to build a more complete catalog of Storfjorden events using data from the Spitsbergen (SPITS) array. The new catalog allows the spatiotemporal distribution of seismicity within the fjord to be studied in greater detail. Information regarding the location of active event clusters provides a means of inferring the tectonic structure within the fault zone. The distribution of active clusters and moment tensor solutions for the Storfjorden sequence suggests there are at least two different structures within the fjord: a NE-SW trending linear feature with oblique-normal to strike-slip faulting and E-W trending normal faults.

关键词： correlation detectors Subspace detectors Aftershock sequence Tectonics Seismicity

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On the Small SNR Processing Ability of IR Point Target Detection

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Journal of Systems Engineering and Electronics 1993年第3期4卷 28-36页

作者： Song, Liuping Sun, Zhongkang Natl Univ of Defense Technology Changsha China

Three-dimensional (3-D) matched filtering has been suggested as a powerful processing technique for detecting weak, moving IR point target immersed in a noisy field. Based on the theory of the 3-D matched filtering and the optimal linear processing, the optimal point target detector is being analyzed in this paper. The performance of the detector is introduced in detail. The results provide a standard reference to evaluate the performance of any other point target detection algorithms.

关键词： Algorithms correlation detectors Digital signal processing Image processing Signal detection Signal to noise ratio Systems analysis Three dimensional

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EVALUATION OF A SUITABLE THRESHOLD FOR BINARIZATION OF POWER SPECTRUM IN A NOISE-FREE JOINT TRANSFORM CORRELATOR

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OPTICS COMMUNICATIONS 1992年第4-6期90卷 221-226页

作者： VALLMITJANA, S JUVELLS, I CARNICER, A Universitat de Barcelona Laboratori d'Optica Department de Física Aplicada i Electrònica Diagonal 647 08028 Barcelona Spain

An analysis by digital simulation of the influence of the threshold level on the binary power spectrum of a joint transform correlator has been carried out. The correlation results are studied where binarized intensity takes the values [0, 1] and [-1, 1]. The influence of threshold level on the efficiency and discrimination are analyzed. The results obtained allow us to propose an appropriate level of binarization for noise-free scenes.

关键词： correlation detectors

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Vehicle detection and tracking based on phase-correlation

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Chinese Optics Letters 2004年第6期2卷 323-324页

作者：何毅杨新 Pattern Recongnition and Intelligence System Laboratory Shanghai Jiao Tong UniversityShanghai 200030 Pattern Recongnition and Intelligence System Laboratory Shanghai Jiao Tong UniversityShanghai 200030his paper presents vehicle detection and tracking algorithms based on real-time background (RTB) and phase-correlation (PC) in the video sequence of urban highway with fixed camera. Firstly moving objects are obtained by subtracting RTB from serial images. After classification PC is used to determine corresponding regions of moving objects between consecutive frames. The problems of vehicles' merging and splitting sudden stop and restart are also considered. Experiments show that the method is practical and can realize real-time detection and tracking of vehicles on highway.

This paper presents vehicle detection and tracking algorithms based on real-time background (RTB) and phase-correlation (PC) in the video sequence of urban highway with fixed camera. Firstly moving objects are obtained by subtracting RTB from serial images. After classification, PC is used to determine corresponding regions of moving objects between consecutive frames. The problems of vehicles' merging and splitting, sudden stop, and restart are also considered. Experiments show that the method is practical and can realize real-time detection and tracking of vehicles on highway.

关键词： Algorithms correlation detectors Real time systems Vehicles

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BACKGROUND-FREE AUTOCORRELATORS BY COUNTER-PROPAGATING SURFACE-PLASMONS

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OPTICS COMMUNICATIONS 1993年第1-4期100卷 215-219页

作者： PANACHIA, S CUTOLO, A SOLIMENO, S ZENI, L UNIV NAPOLI FEDERICO II DIPARTIMENTO INGN ELETTRONI-80125 NAPLESITALY

Taking advantage of the nonlinear interaction between two counter-propagating surface plasmons, we have devised a background-free autocorrelator for short laser pulses diagnostics. Although it has been tested only to measure the coherence spike width of a Q-switched Nd:YAG laser, it can work in the near ir, visible and ultraviolet ranges as well.

关键词： correlation detectors

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