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Antenna array Based Positional Modulation with a Two-Ray Multi-Path Model 10

Antenna Array Based Positional Modulation with a Two-Ray Mul...

引用

10th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Zhang, Bo Liu, Wei Univ Sheffield Commun Res Grp Dept Elect & Elect Engn Sheffield S1 4ET S Yorkshire England

ISBN: (纸本)9781538647523

Traditional directional modulation (DM) designs are based on the assumption that there is no multi-path effect between transmitters and receivers. One problem with these designs is that the resultant systems will be vulnerable to eavesdroppers which are aligned with or very close to the desired directions, as the received modulation pattern at these positions is similar to the given one. To solve the problem, a two-ray multi-path model is studied for positional modulation and the coefficients design problem for a given array geometry and a location-optimised antenna array is solved, where the multi-path effect is exploited to generate a given modulation pattern at desired positions, with scrambled values at positions around them.

关键词： Modulation array signal processing Receivers Phased arrays sensor arrays"

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Convex Joint Emitter Localization and Passive sensor Network Synchronization

Convex Joint Emitter Localization and Passive Sensor Network...

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ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Jean, Oren Weiss, Anthony J. Tel Aviv Univ Sch Elect Engn IL-69978 Tel Aviv Israel

ISBN: (纸本)9781467310710

PATENT PENDING. Time-of-arrival (TOA) localization is tightly coupled with sensor time synchronization. Synchronization can be obtained by GPS, atomic clocks or message exchange protocols. All methods affect the energy sources and the synchronization protocols use valuable bandwidth. We present self-synchronized localization algorithms that rely exclusively on TOA measurements performed by the sensor network on passing sources rendering it completely passive. Localization performance is close to that provided by a perfectly synchronized network. Such algorithms can also be used for sensor network synchronization and communication networks in general.

关键词： sensor networks

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Moving target detection of array antennas based on time reversal 11

Moving target detection of array antennas based on time reve...

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ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Zhang, Zhaoming Chen, Baixiao Yang, Minglei Xu, Hui Xidian Univ Natl Lab Radar Signal Proc Xian Peoples R China Xidian Univ Sch Elect Engn Xian Peoples R China

ISBN: (纸本)9781728119465

This paper develops a time reversal moving target detector based on array antennas. Time reversal utilizes the multipath effect by retransmitting the received signal containing the Doppler shift of the moving target. Two detectors are derived in both conventional and time reversal scenarios, respectively. The Monte Carlo results show that the time reversal detector significantly improves the target detection probability in multipath environments compared with the conventional detector. The increase of multipath number is helpful to improve the detection probability of time reversal detector.

关键词： time reversal moving target array antennas detection

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Incorporating array Nonidealities Into Adaptive Capon Beamformer for Source Tracking

Incorporating Array Nonidealities Into Adaptive Capon Beamfo...

引用

ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Costa, Mario Koivunen, Visa Aalto Univ Dept Signal Proc & Acoust SMARAD CoE FI-00076 Aalto Finland

ISBN: (纸本)9781467310710

An adaptive algorithm for azimuth-angle estimation of moving sources in the presence of array nonidealities is proposed. The method, termed unitary element-space Capon (UES-Capon) beamformer, is robust in the face of small number of snapshots and fully takes into account effects such as mutual coupling, mounting platform reflections, and sensor's misplacement errors. Unlike most of the robust beamformers available in the literature, the proposed method is based on QR-decomposition and real-valued polynomial root tracking. Furthermore, it is applicable to sensor arrays of arbitrary configuration. Numerical results using a real-world antenna array are included, illustrating the excellent performance of the proposed method, both in terms of SINR and fast adaptivity to moving sources.

关键词： capon sensor arrays Snapshots SINR Self tuning tracking

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COMPRESSED SENSING OF GAUSS-MARKOV RANDOM FIELDS WITH WIRELESS sensor NETWORKS

COMPRESSED SENSING OF GAUSS-MARKOV RANDOM FIELDS WITH WIRELE...

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ieee sensor array and multichannel signal processing workshop

作者： Oka, Anand Lampe, Lutz Univ British Columbia Dept Elect & Comp Engn Vancouver BC V5Z 1M9 Canada

ISBN: (纸本)9781424422401

We propose a scalable and energy efficient method for reconstructing a 'sparse' Gauss-Markov random field that is observed by an array of sensors and described over wireless channels to a fusion center. The encoder is universal, i.e. invariant to the statistical model of the source and the channel, and is based on compressed sensing. The reconstruction algorithms exploit the a-priori statistical information about the field and the channel at the fusion center to yield a performance comparable to information theoretic bounds. Furthermore, by putting stringent constraints on the sensing matrix we avoid (or even eliminate) inter-sensor communication while suffering negligible degradation in performance.

关键词： Compressed sensing

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Comparing multistatic with monostatic super-resolution array processing techniques: Detection of random targets

Comparing multistatic with monostatic super-resolution array...

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4th ieee sensor array and multichannel signal processing workshop

作者： Ho, Minhtri Lev-Ari, Hanoch Northeastern Univ Dept Elect & Comp Engn Boston MA 02115 USA

ISBN: (纸本)1424403081

Conventional MUSIC (MUltiple signal Classification)rraethod, which is a well-known super-resolution technique that employs amonostatic configuration, degrades severely when themultiple targets are deterministic because the rank of the covariancematrix collapses to the value of one regardless of the number of targets. FRM (Frequency Response Matrix) [2, 7], with its multistatic configuration, is also a super-resolution technique and can complament, MUSIC in the target randomness spectrum. This paper demonstrates that conventional MUSIC performs better for targets with strongly random (complex) amplitudes and FRM performs better for target with weakly random amplitudes (best for deterministic amplitudes).

关键词： array processing

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Turning point filters

Turning point filters

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Dzieciuch, M Worcester, P Munk, W Univ Calif San Diego Scripps Inst Oceanog La Jolla CA 92093 USA

ISBN: (纸本)0780363396

Modal group delays in ocean acoustics are a potential observable, but their interpretation is ambiguous for signals with sufficient bandwidth for the inherent modal frequency dispersion to be significant. An inability to use the late-arriving energy in an inverse solution for ocean properties motivates this paper. We describe an alternate approach based on the WKBJ approximation for extracting observables from the final crescendo. We have called this approach a turning point filter. The turning point filter offers a unified approach to underwater acoustics, joining what are often two disparate schools of thought, rays and modes. The turning-point filter is an intermediate step between linear beamforming and a full matched field processor. Linear beamforming requires knowledge of the sound speed at the center of the receiving array to extract ray travel-times. Matched field processing attempts to match a measured arrival pattern with a hypothesized arrival pattern, by adjusting the entire sound-speed field between the source and receiver. Turning-point filtering only requires the sound-speed profile across the aperture of the receiving array to extract robust observable peaks. © 2000 ieee.

关键词： array signal processing Bandwidth Delay Educational institutions Filters Frequency Oceans Pattern matching Turning Underwater acoustics

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GENERALIZED COPRIME array CONFIGURATIONS

GENERALIZED COPRIME ARRAY CONFIGURATIONS

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8th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Qin, Si Zhang, Yimin D. Amin, Moeness G. Villanova Univ Ctr Adv Commun Villanova PA 19085 USA

ISBN: (纸本)9781479914814

A coprime array consists of two uniform linear subarrays that construct an effective difference co-array with certain desirable characteristics. In this paper, we propose a generalized coprime array concept through the compression of the interelement spacing of one constituting subarray. As such, the existing variations of coprime array and nested array structures are represented as special cases. The achievable unique lags as well as consecutive lags in the resulting virtual array are analytically expressed, and the direction-of-arrival estimation performance is examined using both the MUSIC algorithm and sparse signal reconstruction techniques.

关键词： Coprime array sparse array difference co-array direction-of-arrival estimation compressive sensing

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Performance comparison of robust array algorithms in delay estimation

Performance comparison of robust array algorithms in delay e...

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3rd ieee sensor array and multichannel signal processing workshop

作者： Puska, H Saarnisaari, H Oulu Univ Ctr Wireless Commun FI-90014 Oulu Finland

ISBN: (纸本)0780385454

Impulsive interference mitigation capabilities of robust array algorithms are considered in delay estimation of a direct sequence spread spectrum (DS/SS) system. The simulations are done in the environment where the direction of arrival (DOA) of individual impulses is either random or fixed. It is shown that the minimum variance distortionless response (MVDR) beamforming algorithm without any interference suppression algorithm is sufficient if impulses are arriving from a fixed DOA. In the random DOA case the performance of the MVDR beamformer algorithm alone is very poor and impulse suppression methods are needed. The paper compares four different impulse suppression methods. It is shown that the best algorithm allow over 60% of snapshots to be corrupted.

关键词： Algorithms

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Passive range estimation and range rate detection

Passive range estimation and range rate detection

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Jeffers, R Breed, B Gallemore, B Digital Syst Resources Inc Fairfax VA 22033 USA

ISBN: (纸本)0780363396

The problem of interest is rapidly closing object (e.g a torpedo) emitting broadband and narrowband acoustic signatures. A high negative range rate is indicative of a torpedo threat, and good range-bearing estimates provide good target localization. A linear, towed hydrophone array is used as a receiver, and in many cases the received signals will display high signal-to-noise ratio. It is desirable to detect at ranges greater than the nearfield range of the array. High-resolution range-bearing estimators have been developed using narrowband signatures and broadband signatures. The range difference to the target across an array causes target signals to display a wave-front curvature. Range estimation is based on wave-front curvature determination using a matched-filtering post beamformer approach. First a target is selected for range estimation in which a subset of beams is chosen for sector inverse beamforming. Curvature pattern replicas over range and bearing are computed and used in a Capon Form beamformer. Simulations and experiments with in-water data compare algorithm performance to a derived benchmark. In addition, a cepstrum-based range rate indicator was demonstrated using experimental data displaying multipath propagation (Lloyd mirror).

关键词： Acoustic beams Acoustic emission Acoustic signal detection array signal processing Computational modeling Displays Mirrors Narrowband signal to noise ratio Sonar equipment

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