Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006.最新文献_第9页

A Biologically-Inspired Compound Eye Particle Detector Array 一种受生物启发的复眼粒子探测器阵列

Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006. Pub Date : 2006-07-12 DOI: 10.1109/SAM.2006.1706220

A. Nehorai

引用次数: 0

Ultra Wideband Multibeam Optical Coherent Transient Radar 超宽带多波束光相干瞬态雷达

Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006. Pub Date : 2006-07-12 DOI: 10.1109/SAM.2006.1706204

B. Braker, Youzhi Li, F. Schlottau, K. Wagner

{"title":"Ultra Wideband Multibeam Optical Coherent Transient Radar","authors":"B. Braker, Youzhi Li, F. Schlottau, K. Wagner","doi":"10.1109/SAM.2006.1706204","DOIUrl":"https://doi.org/10.1109/SAM.2006.1706204","url":null,"abstract":"In this paper, we present an electro-optic radar receiver for wide bandwidth, high time-bandwidth-product radar returns that simultaneously performs parallel beamforming across arrays with thousands of antenna elements. This analog technique allows for correlation times of approximately 10 mus across 30 GHz of bandwidth without the use of extremely fast digitizing circuits or digital processors. To perform this technique, we upconvert the return waveforms from the antenna array onto an array of optical fibers by using an array of electro-optic modulators. From here, we can use a single lens as a Fourier optical beamformer. The frequency scaled beams are formed into a optical coherent transient (OCT) crystal along with an optically upconverted copy of the transmitted waveform. The OCT crystal correlates the return with the reference signal across all squinted beams. A chirped readout laser probes the spectrum of the correlation at each frequency bin across all beams while a synchronized zoom lens compensates for the frequency scaled location of the beams. The resulting beam spectra is Fourier transformed across time to generate the correlation peaks of the return signal. Pulse-to-pulse correlation peaks can be achieved using spatial multiplexing within the crystal or temporal multiplexing of the readout of the signal. We motivate such a system by calculating the digital processor requirements of a similar system, followed by a detailed description of the architecture","PeriodicalId":272327,"journal":{"name":"Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006.","volume":"377 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115851622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analysis of the Directivity Gain of a Synthetic Aperture in Active and Passive Modes 主动和被动模式下合成孔径的方向性增益分析

Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006. Pub Date : 2006-07-12 DOI: 10.1109/SAM.2006.1706148

D. Billon

{"title":"Analysis of the Directivity Gain of a Synthetic Aperture in Active and Passive Modes","authors":"D. Billon","doi":"10.1109/SAM.2006.1706148","DOIUrl":"https://doi.org/10.1109/SAM.2006.1706148","url":null,"abstract":"While synthetic aperture sonar is now a mature technology for active imaging of the sea floor, its use for improving passive detection or localisation of underwater acoustic sources is still a research issue. In the first part, we show that the phase shifts for passive synthetic aperture beamforming do not depend on the steering direction. Hence a passive synthetic aperture has the same directivity pattern like the real aperture that it originates from. The directivity gain of an active synthetic aperture is caused by the phase origin reset at each transmit time resulting in a phase discontinuity depending on the bearing angle. Model-based array processing (MBAP), which estimates a source state from the array vector signal, has been proposed as an alternative to passive synthetic aperture for improving source localization. In the second part, we propose a MBAP approach based on a hidden Markov model (HMM) where the signal phase is a third order polynomial. Numerical simulation shows that it does not improve the bearing angle accuracy with respect to an HMM tracker performing on the square magnitude output of real aperture beamforming. This result is in accordance with the fact that both estimators meet the same Cramer-Rao lower bound. But the new method has interesting detection potential","PeriodicalId":272327,"journal":{"name":"Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006.","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116948081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Link Between the Joint Diagonalisation of Symmetrical Cubes and PARAFAC: An Application to Secondary Surveillance Radar 对称立方体联合对角化与PARAFAC之间的联系:在二次监视雷达中的应用

Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006. Pub Date : 2006-07-12 DOI: 10.1109/SAM.2006.1706157

N. Petrochilos, P. Comon

引用次数: 13

Imaging and Detector Framework for Seismic Landmine Detection 地震地雷探测成像与探测器框架

Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006. Pub Date : 2006-07-12 DOI: 10.1109/SAM.2006.1706097

M. Alam, J. McClellan

引用次数: 1

Distributed Coherent Aperture Measurements for Next Generation BMD Radar 下一代弹道导弹防御雷达的分布式相干孔径测量

Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006. Pub Date : 2006-07-12 DOI: 10.1109/SAM.2006.1706161

S. Coutts, K. Cuomo, J. McHarg, F. Robey, D. Weikle

{"title":"Distributed Coherent Aperture Measurements for Next Generation BMD Radar","authors":"S. Coutts, K. Cuomo, J. McHarg, F. Robey, D. Weikle","doi":"10.1109/SAM.2006.1706161","DOIUrl":"https://doi.org/10.1109/SAM.2006.1706161","url":null,"abstract":"This paper describes the distributed coherent aperture work being carried out at MIT Lincoln Laboratory in support of the next generation radar (NGR) program under the direction of the Radar Systems Technology (RST) group within the Missile Defense Agency/Advanced Systems (MDA/AS) Directorate. The NGR concept achieves transportability and high-radar sensitivity by coherently combining multiple distributed radar apertures in a building block manner. The operational concept uses orthogonal noise-like waveforms and multiple-input multiple-output (MIMO) techniques for cohere-on-receive operation and for adaptively estimating the transmit coherence parameters. In cohere-on-transmit mode, like waveforms are used and the relative phase and transmit time of each transmit pulse is adaptively adjusted so that the transmitted pulses arrive at the target in-phase and at the same time. In cohere-on-receive mode, an N2 signal-to-noise ratio (SNR) gain is achieved over a single aperture when the orthogonal waveforms are combined coherently. In cohere-on-transmit mode, full coherence is achieved on both transmit and receive for an N2 SNR gain over a single radar. The NGR concept and recent highly-successful distributed aperture measurement campaigns are described. These measurements were carried out at the white sands missile range (WSMR) using the Lincoln Laboratory Wideband MIMO Distributed Aperture Test System in July 2005 and at the Air Force Research Laboratory (AFRL) Ipswich Antenna Range Facility in August 2004. Wideband coherence on transmit and receive was demonstrated at X-band in real time against live targets. A performance analysis, including comparison to the Cramer-Rao bounds, is given for the coherence parameter estimators during the presentation. Future plans are briefly discussed, including experiments with more radar channels and plans to demonstrate additional benefits of using MIMO techniques with distributed apertures and through spatial diversity","PeriodicalId":272327,"journal":{"name":"Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006.","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121215504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 73

Threshold Optimization for Distributed Detection using Particle Filtering Methods 基于粒子滤波方法的分布式检测阈值优化

Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006. Pub Date : 2006-07-12 DOI: 10.1109/SAM.2006.1706180

I. Kyriakides, D. Cochran

引用次数: 2

Spectral Analysis from Multi-Rate Observations: Itakura-Saito based Approximation of Power Spectra and Capon-like Spectral Envelopes 多速率观测的光谱分析:基于Itakura-Saito的功率谱近似和类capon光谱包络

Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006. Pub Date : 2006-07-12 DOI: 10.1109/SAM.2006.1706188

A. N. Amini, M. S. Takyar, T. Georgiou

引用次数: 1

Moving Target Localization for Indoor Imaging using Dual Frequency CW Radars 双频连续波雷达室内成像运动目标定位

Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006. Pub Date : 2006-07-12 DOI: 10.1109/SAM.2006.1706156

M. Amin, P. Zemany, P. Setlur, F. Ahmad

引用次数: 39

Progress Towards a Wideband RF Imager 宽带射频成像仪的研究进展

Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006. Pub Date : 2006-07-12 DOI: 10.1109/SAM.2006.1706201

B. Braker, Youzhi Li, F. Schlottau, K. Wagner

{"title":"Progress Towards a Wideband RF Imager","authors":"B. Braker, Youzhi Li, F. Schlottau, K. Wagner","doi":"10.1109/SAM.2006.1706201","DOIUrl":"https://doi.org/10.1109/SAM.2006.1706201","url":null,"abstract":"RF imaging is the mapping of signal intensity to the available azimuth and elevation angles of arrival. Although the result is analogous to optical images, which are formed using optical lenses, RF imagers typically use processor-intensive synthesis imaging techniques to form the image from signals collected by an antenna array. As the antenna array element count and the bandwidth of the receivers grow, however, the required processing power rapidly increases. In the experiment presented in this paper, we choose an electro-optic process to form the RF images. We upconvert the array of antenna signals onto an spatial optical fiber array, which allows us to use a lens as a Fourier optical beamformer. As we show with initial results, this forms frequency-scaled narrowband images of the RF object onto an image plane where they may be detected by an optical camera. To collect wideband images, we must compensate for the narrowband frequency scaling, so we incorporate a spectral hole burning (SHB) crystal as a time integrating image channelizer. The SHB crystal integrates narrowband images within 1 MHz wide spectral bins across a spectral bandwidth up to 30 GHz. These narrowband images are sequentially read from the crystal and scaled by an external zoom lens such that, when integrated on an optical camera, they form a wideband image. We present experimental progress towards forming a one dimensional image across a frequency band of 2-4 GHz","PeriodicalId":272327,"journal":{"name":"Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006.","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131566185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1