keyword
MENU ▼
Read by QxMD icon Read
search

Radar

keyword
https://www.readbyqxmd.com/read/28342616/performance-of-leading-artifact-removal-algorithms-assessed-across-microwave-breast-imaging-prototype-scan-configurations
#1
M A Elahi, C Curtis, B R Lavoie, M Glavin, E Jones, E Fear, M O'Halloran
Microwave imaging is a promising imaging modality for the detection of early-stage breast cancer. One of the most important signal processing components of microwave radar-based breast imaging is early-stage artifact removal. Several artifact removal algorithms have been reported in the literature. However, the neighbourhood-based skin subtraction and hybrid artifact removal algorithms have shown particularly promising results in different realistic 3D breast phantoms. For the first time in this paper, both algorithms have been evaluated and compared using the scan approaches of the most common microwave breast imaging prototype systems...
March 2, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28338604/radar-interferometry-for-monitoring-the-vibration-characteristics-of-buildings-and-civil-structures-recent-case-studies-in-spain
#2
Guido Luzi, Michele Crosetto, Enric Fernández
The potential of a coherent microwave sensor to monitor the vibration characteristics of civil structures has been investigated in the past decade, and successful case studies have been published by different research teams. This remote sensing technique is based on the interferometric processing of real aperture radar acquisitions. Its capability to estimate, simultaneously and remotely, the displacement of different parts of the investigated structures, with high accuracy and repeatability, is its main advantage with respect to conventional sensors...
March 24, 2017: Sensors
https://www.readbyqxmd.com/read/28335492/novel-approach-for-the-recognition-and-prediction-of-multi-function-radar-behaviours-based-on-predictive-state-representations
#3
Jian Ou, Yongguang Chen, Feng Zhao, Jin Liu, Shunping Xiao
The extensive applications of multi-function radars (MFRs) have presented a great challenge to the technologies of radar countermeasures (RCMs) and electronic intelligence (ELINT). The recently proposed cognitive electronic warfare (CEW) provides a good solution, whose crux is to perceive present and future MFR behaviours, including the operating modes, waveform parameters, scheduling schemes, etc. Due to the variety and complexity of MFR waveforms, the existing approaches have the drawbacks of inefficiency and weak practicability in prediction...
March 19, 2017: Sensors
https://www.readbyqxmd.com/read/28335487/electromagnetic-vortex-based-radar-imaging-using-a-single-receiving-antenna-theory-and-experimental-results
#4
Tiezhu Yuan, Hongqiang Wang, Yongqiang Cheng, Yuliang Qin
Radar imaging based on electromagnetic vortex can achieve azimuth resolution without relative motion. The present paper investigates this imaging technique with the use of a single receiving antenna through theoretical analysis and experimental results. Compared with the use of multiple receiving antennas, the echoes from a single receiver cannot be used directly for image reconstruction using Fourier method. The reason is revealed by using the point spread function. An additional phase is compensated for each mode before imaging process based on the array parameters and the elevation of the targets...
March 19, 2017: Sensors
https://www.readbyqxmd.com/read/28335149/radar-a-new-method-of-creation-of-radio-cephalic-fistula-for-hemodialysis-limiting-juxta-anastomotic-stenoses
#5
Nirvana Sadaghianloo, Serge Declemy, Elixène Jean-Baptiste, Pierre Haudebourg, Alan Dardik, Réda Hassen-Khodja
No abstract text is available yet for this article.
January 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28331894/wetland-monitoring-with-global-navigation-satellite-system-reflectometry
#6
Son V Nghiem, Cinzia Zuffada, Rashmi Shah, Clara Chew, Stephen T Lowe, Anthony J Mannucci, Estel Cardellach, G Robert Brakenridge, Gary Geller, Ake Rosenqvist
Information about wetland dynamics remains a major missing gap in characterizing, understanding, and projecting changes in atmospheric methane and terrestrial water storage. A review of current satellite methods to delineate and monitor wetland change shows some recent advances, but much improved sensing technologies are still needed for wetland mapping, not only to provide more accurate global inventories but also to examine changes spanning multiple decades. Global Navigation Satellite Systems Reflectometry (GNSS-R) signatures from aircraft over the Ebro River Delta in Spain and satellite measurements over the Mississippi River and adjacent watersheds demonstrate that inundated wetlands can be identified under different vegetation conditions including a dense rice canopy and a thick forest with tall trees, where optical sensors and monostatic radars provide limited capabilities...
January 2017: Earth Space Sci
https://www.readbyqxmd.com/read/28331778/identification-of-scintillation-signatures-on-gps-signals-originating-from-plasma-structures-detected-with-eiscat-incoherent-scatter-radar-along-the-same-line-of-sight
#7
Biagio Forte, Chris Coleman, Susan Skone, Ingemar Häggström, Cathryn Mitchell, Federico Da Dalt, Tommaso Panicciari, Joe Kinrade, Gary Bust
Ionospheric scintillation originates from the scattering of electromagnetic waves through spatial gradients in the plasma density distribution, drifting across a given propagation direction. Ionospheric scintillation represents a disruptive manifestation of adverse space weather conditions through degradation of the reliability and continuity of satellite telecommunication and navigation systems and services (e.g., European Geostationary Navigation Overlay Service, EGNOS). The purpose of the experiment presented here was to determine the contribution of auroral ionization structures to GPS scintillation...
January 2017: Journal of Geophysical Research. Space Physics
https://www.readbyqxmd.com/read/28325016/sleep-stage-classification-by-non-contact-vital-signs-indices-using-doppler-radar-sensors
#8
Masayuki Kagawa, Kazuki Suzumura, Takemi Matsui
Disturbed sleep has become more common in recent years. To improve the quality of sleep, undergoing sleep observation has gained interest as a means to resolve possible problems. In this paper, we evaluate a non-restrictive and non-contact method for classifying real-time sleep stages and report on its potential applications. The proposed system measures heart rate (HR), heart rate variability (HRV), body movements, and respiratory signals of a sleeping person using two 24-GHz microwave radars placed beneath the mattress...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28322311/orogen-scale-uplift-in-the-central-italian-apennines-drives-episodic-behaviour-of-earthquake-faults
#9
P A Cowie, R J Phillips, G P Roberts, K McCaffrey, L J J Zijerveld, L C Gregory, J Faure Walker, L N J Wedmore, T J Dunai, S A Binnie, S P H T Freeman, K Wilcken, R P Shanks, R S Huismans, I Papanikolaou, A M Michetti, M Wilkinson
Many areas of the Earth's crust deform by distributed extensional faulting and complex fault interactions are often observed. Geodetic data generally indicate a simpler picture of continuum deformation over decades but relating this behaviour to earthquake occurrence over centuries, given numerous potentially active faults, remains a global problem in hazard assessment. We address this challenge for an array of seismogenic faults in the central Italian Apennines, where crustal extension and devastating earthquakes occur in response to regional surface uplift...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28320646/strad-wheel-web-based-library-for-visualizing-temporal-data
#10
Diana Fernondez-Prieto, Carol Naranjo-Valero, Jose Tiberio Hernandez, Hans Hagen
Recent advances in web development, including the introduction of HTML5, have opened a door for visualization researchers and developers to quickly access larger audiences worldwide. Open source libraries for the creation of interactive visualizations are becoming more specialized but also modular, which makes them easy to incorporate in domain-specific applications. In this context, the authors developed STRAD (Spatio-Temporal-Radar) Wheel, a web-based library that focuses on the visualization and interactive query of temporal data in a compact view with multiple temporal granularities...
March 2017: IEEE Computer Graphics and Applications
https://www.readbyqxmd.com/read/28304353/phase-error-correction-for-approximated-observation-based-compressed-sensing-radar-imaging
#11
Bo Li, Falin Liu, Chongbin Zhou, Yuanhao Lv, Jingqiu Hu
Defocus of the reconstructed image of synthetic aperture radar (SAR) occurs in the presence of the phase error. In this work, a phase error correction method is proposed for compressed sensing (CS) radar imaging based on approximated observation. The proposed method has better image focusing ability with much less memory cost, compared to the conventional approaches, due to the inherent low memory requirement of the approximated observation operator. The one-dimensional (1D) phase error correction for approximated observation-based CS-SAR imaging is first carried out and it can be conveniently applied to the cases of random-frequency waveform and linear frequency modulated (LFM) waveform without any a priori knowledge...
March 17, 2017: Sensors
https://www.readbyqxmd.com/read/28302580/the-role-of-therapeutic-layering-in-optimizing-treatment-for-patients-with-castration-resistant-prostate-cancer-radar-ii
#12
E David Crawford, Daniel P Petrylak, Neal Shore, Fred Saad, Susan F Slovin, Nicholas J Vogelzang, Thomas E Keane, Phillip J Koo, Leonard G Gomella, Joe M O'Sullivan, Bertrand Tombal, Raoul S Concepcion, Paul Sieber, Nelson N Stone, Steven E Finkelstein, Evan Y Yu
OBJECTIVE: To offer recommendations on identification of disease progression, treatment management strategies, and suggestions on timing of initiating and discontinuing specific CRPC treatments. MATERIALS AND METHODS: The RADAR II [Prostate Cancer Radiographic Assessments for Detection of Advanced Recurrence] Working Group convened to provide guidance on sequencing, combination, or layering of approved treatments for mCRPC based on available data and clinical experience...
March 13, 2017: Urology
https://www.readbyqxmd.com/read/28294996/design-and-imaging-of-ground-based-multiple-input-multiple-output-synthetic-aperture-radar-mimo-sar-with-non-collinear-arrays
#13
Cheng Hu, Jingyang Wang, Weiming Tian, Tao Zeng, Rui Wang
Multiple-Input Multiple-Output (MIMO) radar provides much more flexibility than the traditional radar thanks to its ability to realize far more observation channels than the actual number of transmit and receive (T/R) elements. In designing the MIMO imaging radar arrays, the commonly used virtual array theory generally assumes that all elements are on the same line. However, due to the physical size of the antennas and coupling effect between T/R elements, a certain height difference between T/R arrays is essential, which will result in the defocusing of edge points of the scene...
March 15, 2017: Sensors
https://www.readbyqxmd.com/read/28282904/high-resolution-turntable-radar-imaging-via-two-dimensional-deconvolution-with-matrix-completion
#14
Xinfei Lu, Jie Xia, Zhiping Yin, Weidong Chen
Resolution is the bottleneck for the application of radar imaging, which is limited by the bandwidth for the range dimension and synthetic aperture for the cross-range dimension. The demand for high azimuth resolution inevitably results in a large amount of cross-range samplings, which always need a large number of transmit-receive channels or a long observation time. Compressive sensing (CS)-based methods could be used to reduce the samples, but suffer from the difficulty of designing the measurement matrix, and they are not robust enough in practical application...
March 8, 2017: Sensors
https://www.readbyqxmd.com/read/28282892/detection-of-the-vibration-signal-from-human-vocal-folds-using-a-94-ghz-millimeter-wave-radar
#15
Fuming Chen, Sheng Li, Yang Zhang, Jianqi Wang
The detection of the vibration signal from human vocal folds provides essential information for studying human phonation and diagnosing voice disorders. Doppler radar technology has enabled the noncontact measurement of the human-vocal-fold vibration. However, existing systems must be placed in close proximity to the human throat and detailed information may be lost because of the low operating frequency. In this paper, a long-distance detection method, involving the use of a 94-GHz millimeter-wave radar sensor, is proposed for detecting the vibration signals from human vocal folds...
March 8, 2017: Sensors
https://www.readbyqxmd.com/read/28278060/sodomy-s-penumbra
#16
Joseph J Fischel
This article advocates a sodomitical approach to sodomy. Its approach is framed alongside and against three historical glosses on sodomy law: first, that sodomy law instantiates homophobia; second, that sodomy law targets sexual violence against boys; third, that sodomy law reaches assaultive sex against women that did not register as assaultive enough to qualify as "rape" by sexist juries. The first story of sodomy law is mostly wrong. The other two glosses pivot on protection: protection of boys or protection of girls and women...
February 10, 2017: Journal of Homosexuality
https://www.readbyqxmd.com/read/28276445/high-frequency-coastal-overwash-deposits-from-phra-thong-island-thailand
#17
Chris Gouramanis, Adam D Switzer, Kruawun Jankaew, Charles S Bristow, Dat T Pham, Sorvigenaleon R Ildefonso
The 26(th) December 2004 Indian Ocean Tsunami (IOT) emanated from an Mw 9.2 earthquake that generated a 1600 km-long rupture along the Sumatran Megathrust and generated tsunami waves up to 30 m high. The IOT directly impacted the Bay of Bengal and east Africa, with over 283,000 people perishing. At the time, this catastrophic event was considered unprecedented and sparked intense investigations to test this claim. It is now believed that four pre-2004 IOT events have occurred in the last 2500 years, recurring every 550 to 700 years...
March 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28275729/radar-interferometry-offers-new-insights-into-threats-to-the-angkor-site
#18
Fulong Chen, Huadong Guo, Peifeng Ma, Hui Lin, Cheng Wang, Natarajan Ishwaran, Peou Hang
The conservation of World Heritage is critical to the cultural and social sustainability of regions and nations. Risk monitoring and preventive diagnosis of threats to heritage sites in any given ecosystem are a complex and challenging task. Taking advantage of the performance of Earth Observation technologies, we measured the impacts of hitherto imperceptible and poorly understood factors of groundwater and temperature variations on the monuments in the Angkor World Heritage site (400 km(2)). We developed a two-scale synthetic aperture radar interferometry (InSAR) approach...
March 2017: Science Advances
https://www.readbyqxmd.com/read/28273800/isar-imaging-of-ship-targets-based-on-an-integrated-cubic-phase-bilinear-autocorrelation-function
#19
Jibin Zheng, Hongwei Liu, Zheng Liu, Qing Huo Liu
For inverse synthetic aperture radar (ISAR) imaging of a ship target moving with ocean waves, the image constructed with the standard range-Doppler (RD) technique is blurred and the range-instantaneous-Doppler (RID) technique has to be used to improve the image quality. In this paper, azimuth echoes in a range cell of the ship target are modeled as noisy multicomponent cubic phase signals (CPSs) after the motion compensation and a RID ISAR imaging algorithm is proposed based on the integrated cubic phase bilinear autocorrelation function (ICPBAF)...
March 3, 2017: Sensors
https://www.readbyqxmd.com/read/28273113/application-of-the-pj-and-nps-evaporation-duct-models-over-the-south-china-sea-scs-in-winter
#20
Shaobo Yang, Xingfei Li, Chao Wu, Xin He, Ying Zhong
The detection of duct height has a significant effect on marine radar or wireless apparatus applications. The paper presents two models to verify the adaptation of evaporation duct models in the SCS in winter. A meteorological gradient instrument used to measure evaporation ducts was fabricated using hydrological and meteorological sensors at different heights. An experiment on the adaptive characteristics of evaporation duct models was carried out over the SCS. The heights of the evaporation ducts were measured by means of log-linear fit, Paulus-Jeske (PJ) and Naval Postgraduate School (NPS) models...
2017: PloS One
keyword
keyword
37479
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"