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Journal articles on the topic 'Phased Array Seekers'

Author: Grafiati

Published: 6 September 2023

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1

Su, Quanyong, Juan Liu, Xianmou Xue, and Zheng Shi. "High power density thermal control design of onboard phased array antenna." Journal of Physics: Conference Series 2083, no. 2 (2021): 022034. http://dx.doi.org/10.1088/1742-6596/2083/2/022034.

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Abstract Thermal control of high power density phased array antenna [1] has become a critical problem for onboard seeker which is confined by compact structure and harsh flight condition [2-4], different from land-based or airborne seekers. As a key technology, thermal control of onboard phased array antenna faces the challenge of high density power element as well as worse operating temperature. Using finite volume method as theoretic foundation of numerical simulation, this paper firstly calculates temperature field and fluid field via discrete control equation group, which is transformed fr

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2

Liu, Ying, Wei Feng Tian, Jian Kang Zhao, Shi Qing Zhu, and Ge Wen Yang. "Line-of-Sight Angle Rate Reconstruction for Phased Array Strapdown Seeker." Advanced Materials Research 645 (January 2013): 196–201. http://dx.doi.org/10.4028/www.scientific.net/amr.645.196.

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The phased array strapdown radar seeker’s detecting information is coupled with missile attitude information. Hence, the measurement information can not be used for proportional navigation directly. The method of reconstructing inertial line of sight (LOS) rate in phased array strapdown seeker is presented using the missile-target relative motion geometric and filtering algorithm. Considering measurement noise and nonlinearity of the phased array strapdown radar guidance systems, the principle of unscented kalman filter (UKF) is introduced to estimate LOS rate. The simulation results show that

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3

Du, Xiao, and Qunli Xia. "The calibration method of phased array seeker with the phantom-bit technology." Optik 127, no. 18 (2016): 7225–34. http://dx.doi.org/10.1016/j.ijleo.2016.05.066.

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4

Bai, Rui, Qunli Xia, and Xiao Du. "The study of guidance performance of a phased array seeker with platform." Optik 132 (March 2017): 9–23. http://dx.doi.org/10.1016/j.ijleo.2016.12.022.

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5

WEN, Qiuqiu, Tianyu LU, Qunli XIA, and Zedong SUN. "Beam-pointing error compensation method of phased array radar seeker with phantom-bit technology." Chinese Journal of Aeronautics 30, no. 3 (2017): 1217–30. http://dx.doi.org/10.1016/j.cja.2017.03.020.

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6

Lin, Shih-Yao, Jiang Wang, and Wei Wang. "Barrier Lyapunov Function Based Integrated Missile Guidance and Control Considering Phased Array Seeker Disturbance Rejection Rate." IEEE Access 10 (2022): 31070–83. http://dx.doi.org/10.1109/access.2022.3156292.

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7

Du, Xiao, and Qunli Xia. "The research of guidance performance of the phased array seeker with platform for air-to-air missile." Optik 127, no. 22 (2016): 10322–34. http://dx.doi.org/10.1016/j.ijleo.2016.08.071.

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8

Lin, Shih-Yao, Defu Lin, and Wei Wang. "A Novel Online Estimation and Compensation Method for Strapdown Phased Array Seeker Disturbance Rejection Effect Using Extended State Kalman Filter." IEEE Access 7 (2019): 172330–40. http://dx.doi.org/10.1109/access.2019.2956256.

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9

Lu, Tianyu, Qiuqiu Wen, and Jian Yin. "The effect of phantom-bit technology on the performance of phased array seeker detection in the case of the initial beam angle." Optik 127, no. 20 (2016): 9996–10003. http://dx.doi.org/10.1016/j.ijleo.2016.08.001.

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10

Guney, Kerim, and Ali Durmus. "Pattern Nulling of Linear Antenna Arrays Using Backtracking Search Optimization Algorithm." International Journal of Antennas and Propagation 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/713080.

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An evolutionary method based on backtracking search optimization algorithm (BSA) is proposed for linear antenna array pattern synthesis with prescribed nulls at interference directions. Pattern nulling is obtained by controlling only the amplitude, position, and phase of the antenna array elements. BSA is an innovative metaheuristic technique based on an iterative process. Various numerical examples of linear array patterns with the prescribed single, multiple, and wide nulls are given to illustrate the performance and flexibility of BSA. The results obtained by BSA are compared with the resul

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11

Guney, K., and S. Basbug. "Seeker optimization algorithm for interference suppression of linear antenna arrays by controlling position-only, phase-only, and amplitude-only." International Journal of RF and Microwave Computer-Aided Engineering 21, no. 5 (2011): 505–18. http://dx.doi.org/10.1002/mmce.20536.

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12

Roy, Kalapi, Bingzhong (David) Guan, and Carl Sechen. "A Sea-of-Gates Style FPGA Placement Algorithm." VLSI Design 4, no. 4 (1996): 293–307. http://dx.doi.org/10.1155/1996/92380.

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Field Programmable Gate Arrays (FPGAs) have a pre-defined chip boundary with fixed cell locations and routing resources. Placement objectives for flexible architectures (e.g., the standard cell design style) such as minimization of chip area do not reflect the primary placement goals for FPGAs. For FPGAs, the layout tools must seek 100% routability within the architectural constraints. Routability and congestion estimates must be made directly based on the demand and availability of routing resources for detailed routing of the particular FPGA. We. present a hierarchical placement approach con

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13

Cook, Mylan R., Kent L. Gee, Carson F. Cunningham, and Grant W. Hart. "Vector acoustic intensity analysis of noise from the Delta IV Heavy launch vehicle during liftoff." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A42. http://dx.doi.org/10.1121/10.0018087.

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The noise sources within a turbulent rocket plume are not well understood, let alone the radiation from multiple rocket nozzles. Even less is known about the noise sources during launch vehicle liftoff. This paper seeks to simultaneously address these noise source analysis challenges using data collected during the NROL-82 Delta IV Heavy (DIVH) launch from Vandenberg Space Force Base. The three-core DIVH’s liftoff noise was measured by a ground-based four-microphone array at a distance of 330 m. Hart et al. [Proc. Mtgs. Acoust. 45, 040003 (2022)] previously used this array with a cross-correla

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14

Raumer, Hans-Georg, and Carsten Spehr. "Wavenumber spectrum determination for aeroacoustic applications using FISTA." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 4 (2023): 3754–62. http://dx.doi.org/10.3397/in_2022_0528.

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This conference paper deals with computational methods to determine the wavenumber spectrum of acoustic data measured by a phased microphone array. Such problems occur e.g. within the analysis of pressure fluctuations due to a turbulent boundary layer on a surface such as a wind-tunnel wall or the skin of an aircraft. The problem is closely related to the deconvolution of dirty beamforming maps in wavenumber domain, which seeks to determine the wavenumber spectrum by removing the influence of the shift-invariant point spread function from the beamforming result. Firstly, we recall how this tas

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15

Raumer, Hans-Georg, Daniel Ernst, and Carsten Spehr. "Compensation of Modeling Errors for the Aeroacoustic Inverse Problem with Tools from Deep Learning." Acoustics 4, no. 4 (2022): 834–48. http://dx.doi.org/10.3390/acoustics4040050.

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In the field of aeroacoustic source imaging, one seeks to reconstruct acoustic source powers from microphone array measurements. For most setups, one cannot expect a perfect reconstruction. The main effects that contribute to this reconstruction error are data noise and modeling errors. While the data noise is accounted for in most advanced reconstruction methods, e.g., by a proper regularization strategy, the modeling error is usually neglected. This article proposes an approach that extends regularized inverse methods with a mechanism that takes the modeling error into account. The presented

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16

Patnaik, Saroj Kumar, Pradeep Kumar, Priya Yadav, et al. "Can microRNA profiles predict corticosteroid responsiveness in childhood nephrotic syndrome? A study protocol." BMJ Paediatrics Open 2, no. 1 (2018): e000319. http://dx.doi.org/10.1136/bmjpo-2018-000319.

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IntroductionIn last few years, several studies have revealed the remarkable stability of extracellular microRNAs (miRNAs) circulating in the blood or excreted in the urine and underscored their key importance as biomarkers of certain diseases. Since miRNA in urinary sediment is relatively stable and easily quantified, it has the potential to be developed as a biomarker for disease diagnosis and monitoring. Identification of serum and urinary levels of certain miRNAs may assist in the diagnosis and assessment of disease activity in patients with nephrotic syndrome (NS). The global expression pr

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17

Raufi, Alexander, Winston Wong, Shing Mirn Lee, and Gulam Abbas Manji. "MEKiAUTO: A phase I/II open-label study of combination therapy with the MEK inhibitor cobimetinib, Immune-checkpoint blockade with atezolizumab, and the AUTOphagy inhibitor hydroxychloroquine in KRAS-mutated advanced malignancies." Journal of Clinical Oncology 39, no. 3_suppl (2021): TPS450. http://dx.doi.org/10.1200/jco.2021.39.3_suppl.tps450.

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TPS450 Background: Pancreatic ductal adenocarcinoma (PDAC) and colorectal carcinoma (CRC) are aggressive diseases which account for the third and second leading causes of cancer-related death, respectively. Limited progress has been made towards effective treatments or cure. K RAS is mutated or amplified in nearly 30% of all cancers, including up to 95% of PDAC and 45% of CRC. Although no successful KRAS directed therapy has been approved to date, data has emerged demonstrating that inhibition of downstream targets of KRAS, namely MEK/ERK, increases autophagic flux in KRAS-mutated tumors. This

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18

Cook, David, Ingibjörg Karlsdóttir, and Inga Minelgaite. "Enjoying the Heat? Co-Creation of Stakeholder Benefits and Sustainable Energy Development within Projects in the Geothermal Sector." Energies 15, no. 3 (2022): 1029. http://dx.doi.org/10.3390/en15031029.

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Analysis of the sustainability implications of the geothermal industry has tended to take a high-level or systemic overview of national performance rather than deeper, stakeholder-focused investigations. This study seeks to begin to fill this gap in the literature, investigating the following research question: how do projects in the Icelandic geothermal energy sector create co-benefits with stakeholders and reflect the integration of sustainable energy development (SED)? The focus of the analysis is identifying the stakeholders, what the sustainability benefits co-created with stakeholders ar

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19

Downs, Robert S., and Jens H. M. Fransson. "Tollmien–Schlichting wave growth over spanwise-periodic surface patterns." Journal of Fluid Mechanics 754 (July 30, 2014): 39–74. http://dx.doi.org/10.1017/jfm.2014.377.

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AbstractA novel type of surface roughness is deployed in a zero-pressure-gradient boundary layer with the goal of delaying the onset of laminar-to-turbulent transition for drag reduction purposes. This proof-of-concept experiment relies on forcing phase-triggered Tollmien–Schlichting (TS) waves across a range of initial amplitudes to produce amplified boundary-layer disturbances in a controlled and repeatable manner. Building on earlier work demonstrating attenuation of forced disturbances and delay of transition with spanwise arrays of discrete roughness and miniature vortex generators (MVGs)

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20

Bonadio, Raffaele, Sergei Lebedev, Thomas Meier, et al. "Optimal resolution tomography with error tracking and the structure of the crust and upper mantle beneath Ireland and Britain." Geophysical Journal International 226, no. 3 (2021): 2158–88. http://dx.doi.org/10.1093/gji/ggab169.

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SUMMARY The classical Backus–Gilbert method seeks localized Earth-structure averages at the shortest length scales possible, given a data set, data errors, and a threshold for acceptable model errors. The resolving length at a point is the width of the local averaging kernel, and the optimal averaging kernel is the narrowest one such that the model error is below a specified level. This approach is well suited for seismic tomography, which maps 3-D Earth structure using large sets of seismic measurements. The continual measurement-error decreases and data-redundancy increases have reduced the

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21

Parkin, Brian, Peter Ouillette, Yifeng Li, Cheng Li, Kerby Shedden, and Sami Malek. "Clonal Evolution and Devolution Following Chemotherapy in Adult Acute Myelogenous Leukemia." Blood 120, no. 21 (2012): 2487. http://dx.doi.org/10.1182/blood.v120.21.2487.2487.

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Abstract Abstract 2487 Introduction: Despite significant advances in the understanding of the biology of adult acute myelogenous leukemia (AML), overall survival remains poor due chiefly to the high rate of relapse after achieving complete remission as well as primary failure of induction chemotherapy. Efforts to further unravel the mechanisms leading to relapse and primary refractory disease are critical in order to guide the development of effective and durable treatment strategies for AML. To that end, this study seeks to elucidate the clonal relationship of AML in various disease phases. M

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22

Iizuka, Kotaro, Yuichi S. Hayakawa, Takuro Ogura, Yasutaka Nakata, Yoshiko Kosugi, and Taichiro Yonehara. "Integration of Multi-Sensor Data to Estimate Plot-Level Stem Volume Using Machine Learning Algorithms–Case Study of Evergreen Conifer Planted Forests in Japan." Remote Sensing 12, no. 10 (2020): 1649. http://dx.doi.org/10.3390/rs12101649.

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The development of new methods for estimating precise forest structure parameters is essential for the quantitative evaluation of forest resources. Conventional use of satellite image data, increasing use of terrestrial laser scanning (TLS), and emerging trends in the use of unmanned aerial systems (UASs) highlight the importance of modern technologies in the realm of forest observation. Each technology has different advantages, and this work seeks to incorporate multiple satellite, TLS- and UAS-based remote sensing data sets to improve the ability to estimate forest structure parameters. In t

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23

Yu, Jing. "Performance Analysis of Beam Error Parasitic Loop of Phased Array Radar Seeker." International Journal of Performability Engineering, 2018. http://dx.doi.org/10.23940/ijpe.18.11.p21.27522759.

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24

Zhang, Quan, Yunfeng Chen, Fangxue Zhang, and Yangkang Chen. "Improving receiver function imaging with high-resolution Radon transform." Geophysical Journal International, March 22, 2022. http://dx.doi.org/10.1093/gji/ggac116.

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SUMMARY The receiver function (RF) method is one of the most widely used passive seismic approaches for imaging subsurface structures from shallow sedimentary basins to the deep Earth’s interior. RF is typically computed with a deconvolution operation that enables separating structural response from source-time function embedded in teleseismic wavefields. However, seismic recordings of temporary arrays are often contaminated with strong random noise and even amplitude bias due to poor installation conditions. Both factors can cause instability to deconvolution and severely degrade the accuracy

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25

Cho, In Ho, Sinchul Yeom, Tanmoy Sarkar, and Tae-Sik Oh. "Unraveling hidden rules behind the wet-to-dry transition of bubble array by glass-box physics rule learner." Scientific Reports 12, no. 1 (2022). http://dx.doi.org/10.1038/s41598-022-07170-y.

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AbstractA liquid–gas foam, here called bubble array, is a ubiquitous phenomenon widely observed in daily lives, food, pharmaceutical and cosmetic products, and even bio- and nano-technologies. This intriguing phenomenon has been often studied in a well-controlled environment in laboratories, computations, or analytical models. Still, real-world bubble undergoes complex nonlinear transitions from wet to dry conditions, which are hard to describe by unified rules as a whole. Here, we show that a few early-phase snapshots of bubble array can be learned by a glass-box physics rule learner (GPRL) l

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26

Köhler, A., E. B. Myklebust, and S. Mæland. "Enhancing seismic calving event identification in Svalbard through empirical matched field processing and machine learning." Geophysical Journal International, March 22, 2022. http://dx.doi.org/10.1093/gji/ggac117.

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SUMMARY Seismic signals generated by iceberg calving can be used to monitor ice loss at tidewater glaciers with high temporal resolution and independent of visibility. We combine the Empirical Matched Field (EMF) method and machine learning using Convolutional Neural Networks (CNNs) for calving event detection at the SPITS seismic array and the single broadband station KBS on the Arctic Archipelago of Svalbard. EMF detection with seismic arrays seeks to identify all signals generated by events in a confined target region similar to single P and/or S phase templates by assessing the beam power

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27

Kolasinski, Kurt W. "Bubbles: A review of their relationship to the formation of thin films and porous materials." Open Material Sciences 1, no. 1 (2014). http://dx.doi.org/10.2478/mesbi-2014-0003.

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AbstractBubbles arise at the intersection of gases with other phases. Their role in the formation and applications of thin films and porous materials is complex. At times they are to be avoided. In other cases they are essential to the desired properties and outcomes. In many cases their function, form and production are misunderstood or disregarded. This review seeks to connect a diverse array of technical and fundamental aspects of bubbles so as to facilitate more control and understanding of their functions and utility

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