Gotowe bibliografie tematyczne / Small aperture active phased array

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Gotowa bibliografia na temat „Small aperture active phased array”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Small aperture active phased array"

Lu, Junqi, i Yongxin Guo. "Compact Planar Sparse Array Antenna with Optimum Element Dimensions for SATCOM Ground Terminals". International Journal of Antennas and Propagation 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/806981.

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A novel antenna array architecture for low-cost and compact SATCOM mobile terminal is presented. Based on equal-amplitude aperiodic phased array with fewer active chain numbers, it possesses advantages including lower weight, less cost, and higher power efficiency compared to conventional periodic phased arrays. It is implemented with printed patch antenna so that it guarantees compactness. The elements position and dimensions are jointly designed, with an effective sparse array synthesis strategy that takes actual patch antenna design constraint into consideration, to obtain a maximum array aperture efficiency. Executable and practical approach for variable dimension patch antenna designing, including defect substrate element and small scale array, is introduced and utilized to implement proposed sparse array. Full-wave simulation results demonstrate the advantages of proposed array antenna as well as the effectiveness of corresponding design approach.

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Shi, Wei, Zuping Qian, Jun Zhou, Xinbo Qu, Yang Xiang i Liu Hong. "A Small Ku-Band Polarization Tracking Active Phased Array for Mobile Satellite Communications". International Journal of Antennas and Propagation 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/747629.

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A compact polarization tracking active phased array for Ku-band mobile satellite signal reception is presented. In contrast with conventional mechanically tracking antennas, the approach presented here meets the requirements of beam tracking and polarization tracking simultaneously without any servo components. The two-layer stacked square patch fed by two probes is used as antenna element. The impedance bandwidth of 16% for the element covers the operating frequency range from 12.25 GHz to 12.75 GHz. In the presence of mutual coupling, the dimensional parameters for each element of the small 7 × 7 array are optimized during beam scanning and polarization tracking. The compact polarization tracking modules based on the low-temperature cofired ceramic (LTCC) system-in-package (SiP) technology are proposed. A small active phased array prototype with the size of 120 mm (length) × 120 mm (width) × 55 mm (height) is developed. The measured polarization tracking patterns of the prototype are given. The polarization tracking beam can be steered in the elevation up to 50°. The gain of no less than 16.0 dBi and the aperture efficiency of more than 50% are obtained. The measured and simulated polarization tracking patterns agreed well.

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Luo, Xuan, Jun Ouyang, Zhihui Chen, Lei Han i Wei Yan. "A Low-Profile 36-Element K-Band Active Phased Array for Ultra-Small Aperture Application". IEEE Access 8 (2020): 62286–97. http://dx.doi.org/10.1109/access.2020.2983604.

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Knott, Peter, Thomas Bertuch, Helmut Wilden, Olaf Peters, Andreas R. Brenner i Ingo Walterscheid. "SAR Experiments Using a Conformal Antenna Array Radar Demonstrator". International Journal of Antennas and Propagation 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/142542.

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Conformal antenna arrays have been studied for several years but only few examples of applications in modern radar or communication systems may be found up to date due to technological difficulties. The objective of the “Electronic Radar with Conformal Array Antenna” (ERAKO) demonstrator system which has been developed at the Fraunhofer Institute for High Frequency Physics and Radar Techniques (FHR) is to demonstrate the feasibility of an active electronically scanned antenna for conformal integration into small and medium sized airborne platforms. For practical trials the antenna has been adapted for operation with the Phased Array Multifunctional Imaging Radar (PAMIR) system developed at the institute. The antenna in combination with the PAMIR front-end needed to undergo a special calibration procedure for beam forming and imaging post-processing. The present paper describes the design and development of the conformal antenna array of the demonstrator system, its connection to the PAMIR system and results of recently conducted synthetic aperture radar (SAR) experiments.

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Liu, Rong, Naizhi Wang, Tong Li, Ruoqiao Zhang i Hongchao Wu. "X-Band Active Phased Array Antenna Using Dual-Port Waveguide for High-Power Microwave Applications". Electronics 11, nr 23 (6.12.2022): 4064. http://dx.doi.org/10.3390/electronics11234064.

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An X-band active phased array horn antenna with high power capacity and high peak power is proposed in this paper. At the horn aperture, the baffles are loaded to suppress higher-order modes and eliminate blind spots during beam scanning. Straight walls are added to improve impedance matching. Considering that the peak power that T/R modules can provide is very limited, the proposal of a dual-port waveguide breaks through the bottleneck of the power capacity of a single-port input for the first time. The proposed curved dual-port waveguide is used to connect the horn antenna and the T/R module, which is verified to improve the power capacity of the overall internal structure. Simulated and measured results show that VSWR ≤ 2 in the frequency range of 7.5–8.5 GHz. There is no grating lobe in the ±10° scanning range and the maximum gain drop does not exceed 0.4 dB. The power capacity of the proposed HPM array is 56.34 MW. The phased array antenna has the characteristics of flexible scanning, small size, and high gain, and can be applied in high-power microwave systems.

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Krüger, Frank, Torsten Dahm i Katrin Hannemann. "Mapping of Eastern North Atlantic Ocean seismicity from Po/So observations at a mid-aperture seismological broad-band deep sea array". Geophysical Journal International 221, nr 2 (1.02.2020): 1055–80. http://dx.doi.org/10.1093/gji/ggaa054.

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SUMMARY A mid-aperture broad-band test array (OBS array DOCTAR) was deployed from June 2011 to April 2012 about 100 km north of the Gloria fault in the Eastern North Atlantic in about 5000 m water depth. In addition arrays were installed on Madeira Island and in western Portugal mainland. For the first time in the Eastern North Atlantic, we recorded a large number of high frequency Po and So waves from local and regional small and moderate earthquakes (ML < 4). An incoherent beamforming method was adapted to scan continuous data for such Po and So arrivals applying a sliding window waveform migration and frequency–wavenumber technique. We identify about 320 Po and 1550 So arrivals and compare the phase onsets with the ISC catalogue (ISC 2015) for the same time span. Up to a distance of 6° to the DOCTAR stations all events listed in the ISC catalogue could be associated to Po and So phases. Arrivals from events in more than 10° distance could be identified only in some cases. Only few Po and/or So arrivals were detected for earthquakes from the European and African continental area, the continental shelf regions and for earthquakes within or northwest of the Azores plateau. Unexpectedly, earthquake clusters are detected within the oceanic plates north and south of the Gloria fault and far from plate boundaries, indicating active intraplate structures. We also observe and locate numerous small magnitude earthquakes on the segment of the Gloria fault directly south of DOCTAR, which likely coincides with the rupture of the 25 November 1941 event. Local small magnitude earthquakes located beneath DOCTAR show hypocentres up to 30 km depth and strike-slip focal mechanisms. A comparison with detections at temporary mid-aperture arrays on Madeira and in western Portugal shows that the deep ocean array performs much better than the island and the continental array regarding the detection threshold for events in the oceanic plates. We conclude that sparsely distributed mid-aperture seismic arrays in the deep ocean could decrease the detection and location threshold for seismicity with ML < 4 in the oceanic plate and might constitute a valuable tool to monitor oceanic plate seismicity.

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Kim, Seok, Chan-Mi Song, Seung-Hun Lee, Sung-Chan Song i Hyun-Ung Oh. "Design and Performance of X-Band SAR Payload for 80 kg Class Flat-Panel-Type Microsatellite Based on Active Phased Array Antenna". Aerospace 9, nr 4 (13.04.2022): 213. http://dx.doi.org/10.3390/aerospace9040213.

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The small synthetic aperture radar (SAR) technology experimental project (S-STEP) mission aims to develop an innovative spaceborne SAR microsatellite as a constellation of 32 microsatellites featuring a high-resolution stripmap mode of 1 m. The S-STEP is a spaceborne SAR microsatellite technology demonstration program in which innovative approaches have been proposed and investigated for SAR payload system designs for improving the development speed, affordability, size and weight parameters, and quality of SAR satellite systems. In this study, the major design approach includes a bus–payload integrated flat-panel-type SAR payload based on an active phased-array antenna. This study conducted an SAR image performance analysis considering the mission requirements to validate the feasibility of the innovative SAR payload design of the S-STEP. These performance analysis results are presented to demonstrate the effectiveness of the proposed SAR payload design approach under the new space paradigm.

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Kojima, Yuki, Kazuo Oki, Kosuke Noborio i Masaru Mizoguchi. "Estimating Soil Moisture Distributions across Small Farm Fields with ALOS/PALSAR". International Scholarly Research Notices 2016 (26.07.2016): 1–8. http://dx.doi.org/10.1155/2016/4203783.

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The ALOS (advanced land observing satellite) has an active microwave sensor, PALSAR (phased array L-band synthetic aperture radar), which has a fine resolution of 6.5 m. Because of the fine resolution, PALSAR provides the possibility of estimating soil moisture distributions in small farmlands. Making such small-scale estimates has not been available with traditional satellite remote sensing techniques. In this study, the relationship between microwave backscattering coefficient (σ) measured with PALSAR and ground-based soil moisture was determined to investigate the performance of PALSAR for estimating soil moisture distribution in a small-scale farmland. On the ground at a cabbage field in Japan in 2008, the soil moisture distribution of multiple soil layers was measured using time domain reflectometry when the ALOS flew over the field. Soil moisture in the 0–20 cm soil layer showed the largest correlation coefficient with σ (r=0.403). The σ values also showed a strong correlation with the ground surface coverage ratio by cabbage plants. Our results suggested that PALSAR could estimate soil moisture distribution of the 0–20 cm soil layer across a bare field and a crop coverage ratio when crops were planted.

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Morabito, Simona, Paola Cusano, Danilo Galluzzo, Guido Gaudiosi, Lucia Nardone, Pierdomenico Del Gaudio, Anna Gervasi i in. "One-Year Seismic Survey of the Tectonic CO2-Rich Site of Mefite d’Ansanto (Southern Italy): Preliminary Insights in the Seismic Noise Wavefield". Sensors 23, nr 3 (2.02.2023): 1630. http://dx.doi.org/10.3390/s23031630.

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A passive seismic experiment is carried out at the non-volcanic highly degassing site of Mefite d’Ansanto located at the northern tip of the Irpinia region (southern Italy), where the 1980 MS 6.9 destructive earthquake occurred. Between 2020 and 2021, background seismic noise was recorded by deploying a broadband seismic station and a seismic array composed of seven 1 Hz three-component sensors. Using two different array configurations, we were allowed to explore in detail the 1–20 Hz frequency band of the seismic noise wavefield as well as Rayleigh wave phase velocities in the 400–800 m/s range. Spectral analyses and array techniques were applied to one year of data showing that the frequency content of the signal is very stable in time. High frequency peaks are likely linked to the emission source, whereas at low frequencies seismic noise is clearly correlated to meteorological parameters. The results of this study show that small aperture seismic arrays probe the subsurface of tectonic CO2-rich emission areas and contribute to the understanding of the link between fluid circulation and seismogenesis in seismically active regions.

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Govorčin, Marin, Boško Pribičević i Shimon Wdowinski. "Surface Deformation Analysis of the Wider Zagreb Area (Croatia) with Focus on the Kašina Fault, Investigated with Small Baseline InSAR Observations". Sensors 19, nr 22 (7.11.2019): 4857. http://dx.doi.org/10.3390/s19224857.

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The wider Zagreb area is considered one of the few seismically active areas in the Republic of Croatia. During the period 1880–1906, moderate to strong seismic activity with three earthquakes magnitude M L ≥ 6 occurred on the NW-SE striking Kašina Fault and since then, the area has not experienced earthquakes exceeding magnitude M L = 5 . In order to estimate the ongoing interseismic strain accumulation along the fault, we analyze Advanced Land Observing Satellite (ALOS) Phased Array L-band SAR (PALSAR) and Environmental Satellite (Envisat)-Advanced Synthetic Aperture Radar (ASAR) datasets acquired over the period 2007–2010 and 2002–2010, respectively. The data were analyzed using small baseline interferometry (SBI) technique and indicate very slow surface deformations in the area, within ±3.5 mm/year, which are in a good agreement with previous geodetic studies. Interseismic strain accumulation analysis was conducted on two 14 km long segments of the Kašina Fault, seismically active in the South and stable in the North. The analysis indicates an ongoing interseismic strain accumulation of 2.3 mm/year on the Southern segment and no detectable strain accumulation on the Northern segment. Taking into consideration the lack of moderate to strong seismic activity in the past 113 years combined with the preliminary geodetic analysis from this study, we can conclude that the Southern segment of the Kašina Fault has the potential to generate earthquake magnitude M w < 6.

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Rozprawy doktorskie na temat "Small aperture active phased array"

Nalumakkal, Priya Suresh. "Ultrawideband and wide-angle scan antenna element and small active phased arrays". Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6157.

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Wideband, wide-scan active phased arrays (APA) are widely used for multi-function radars, communication and electronic warfare. Although considerable research is available on the design and analysis of such antenna elements and arrays with large aperture, multi-octave wide scan phased antenna arrays with an electronically small aperture finds major application in electronic warfare (EW), is not well-developed. Based on a detailed literature survey on ultrawideband antenna for the wideband APA this research began with investigating different designs of tapered slot antenna (TSA) elements. A study of the performance parameters like bandwidth, beamwidth, cross-polarization and beam-squint have been conducted for candidate antenna elements such as microstrip fed TSA, balanced antipodal TSA and stripline fed TSA (STSA). Based on these studies, STSA was selected as the most suitable candidate for meeting the requirement for antenna element. An STSA element with a wide beamwidth of 120° in H-plane with reflection coefficient less than -10 dB is designed. Two different antenna arrays are proposed in this research to demonstrate the advantages of STAS as small aperture active array element for wideband phased arrays. Challenges in the design, analysis and characterization of moderately sized phased arrays using STSA element have been analyzed. Although seof interest in literature, of these a linear active phased array antenna that operates across 6 to 18 GHz frequency range, an array with wide-scan coverage of ±60° in H-plane is not developed. The element pattern in phased arrays causes a squint in the main beam away from broadside. For small phased arrays this can be reduced by on-line calibration by taking a sample of signal at each element of the array. Therefore STSA is integrated with a -20 dB asymmetrical coupler at the feed for calibration and performance monitoring. In addition, the proposed STSA with integrated coupler is designed to have a wideband transition which allows a direct 50 Ω stripline feed. The isolated port of the coupler is internally terminated with a resistor using Ohmegaply resistive layer to improve reliability in airborne platform. A linear array of 16 elements is designed and experimentally demonstrated. The main figure of merit of the array is realised gain of the array over the scan angle. A minimum element gain of 0 dB in array environment is obtained over the scan angle of ±60°, without any grating lobes at high frequency. It also demonstrated a cross-polarization of better than -25 dB at boresight and beam squint less than 1°. A staggered feeding arrangement is incorporated to accommodate the physical dimensions of connectors for minimum inter element spacing. Conventionally the centre element pattern in array environment is used for obtaining the scanning characteristics of a large phased array. But, for small phased array, since the edge effects may be significant an average scan element pattern is proposed for array characterization. This gives an accurate result for the scan characteristics of array and can be used to correct array synthesis before full scale fabrication. This approach is validated by measuring the array pattern of the fabricated array with transmit/receive module. Second, an 8 element E-plane array operating over 1 to 6 GHz frequency range is proposed with scanning of 45° from broadside. This antenna covers D, E, F and G bands of EW system. A novel STSA has been investigated across this bandwidth. Here the radiating part of tapered slot antenna is ended with an elliptical stub instead of circular stub which gives the same performance that of circular stub with reduced overlap with the radial stripline stub. A compact broadband Wilkinson power divider feed network is designed along with array to characterise this. These edge effects are more severe in this array, especially at the low frequency of the operation band and methods to overcome this are investigated. Approaches of additional dummy edge elements or modifying edge elements have been investigated by simulations to reduce edge effects. An approach of adding 3D caps at the edges has been found to be more effective in this regard. To summarize, methods for designing high performance multi-octave stripline fed tapered slot antenna elements and their arrays in the E- and H-plane have been developed using simulations and validated by experiments. These antennas are particularly suited as small aperture arrays in EW applications.

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Części książek na temat "Small aperture active phased array"

Ragavamoorthy, D. V. A., i Prasanna Ram. "Investigation of Beam Switching Phased Array Concept in Multi-layer Graphene-Based Active Antenna Setup for Small Satellite Applications". W Lecture Notes in Mechanical Engineering, 375–82. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1724-2_37.

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"Synthetic aperture radar with active phased arrays". W Radar Techniques Using Array Antennas, 365–92. Institution of Engineering and Technology, 2013. http://dx.doi.org/10.1049/pbra026e_ch14.

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Streszczenia konferencji na temat "Small aperture active phased array"

Revankar, U. K., K. S. Beenamole, Prem N. S. Kutiyal, Mahima Garg, V. Saravana Kumar i Ashutosh Kedar. "Microstrip Antenna Array Solution For Large Size Active Phased Array Aperture". W 2007 IEEE Radar Conference. IEEE, 2007. http://dx.doi.org/10.1109/radar.2007.374257.

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Papamoschou, Dimitri. "Small-Aperture Phased Array Study of Noise from Coaxial Jets". W 45th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-440.

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Rebholz, Matthew, Gary Hatke i Steven D. Campbell. "Active Geolocation Using the Small Airport Surveillance Sensor (SASS) System". W 2019 IEEE International Symposium on Phased Array System & Technology (PAST). IEEE, 2019. http://dx.doi.org/10.1109/past43306.2019.9021075.

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Junqi, Lu, i Guo Yongxin. "Novel aperiodic phased array with reduced number of active chains for space-borne SAR". W 2015 IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR). IEEE, 2015. http://dx.doi.org/10.1109/apsar.2015.7306144.

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Makhoul, Eduardo, Antoni Broquetas, Josep Closa i Paula Saameno. "Internal calibration strategies for space-borne synthetic aperture radars with active phased array antennas". W IGARSS 2011 - 2011 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2011. http://dx.doi.org/10.1109/igarss.2011.6049276.

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Wen Shuling i Lu Yaobing. "1-D high resolution range profiling technique for wideband solid state active phased array radar under active jamming situations". W 2007 1st Asian and Pacific Conference on Synthetic Aperture Radar. IEEE, 2007. http://dx.doi.org/10.1109/apsar.2007.4418559.

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Babu Saraswathi Kavitha, L., i I. Jacob Raglend. "A wide-scan phased array antenna for a small Active Electronically Scanned Array: A review". W 2013 International Conference on Circuits, Power and Computing Technologies (ICCPCT). IEEE, 2013. http://dx.doi.org/10.1109/iccpct.2013.6529010.

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Ding, Xumin, Yue Wang, Kuang Zhang, Jiahui Fu, Cong Wang i Qun Wu. "The Expanding Effect of Scanning Angle for Small-Aperture Phased Array Antenna by Huygens' Metasurface-Based Radome". W 2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC). IEEE, 2021. http://dx.doi.org/10.1109/apwc52648.2021.9539645.

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Moroz, Angelina, Kirill Malanin, Roman Davydov, Vadim Davydov i Vasiliy Rud. "Fiber optic information transmission system for interference compensation circuitry in small-sized active phased array antenna". W 2020 International Conference on Information Technology and Nanotechnology (ITNT). IEEE, 2020. http://dx.doi.org/10.1109/itnt49337.2020.9253323.

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Harvey, James E., i Alan B. Wissinger. "Specifying optical performance of imaging phased telescope arrays". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.ma4.

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Traditional optical performance criteria such as resolution and encircled energy are woefully inadequate for specifying image quality for many phased telescope array applications. Variations in the subaperture geometry which produce only subtle effects on the core of the point spread function may produce highly undesirable artifacts or spurious images as well as a modulation transfer function (MTF) which exhibits zero (or negligible) values over substantial regions within the cutoff spatial frequency characteristic of a filled aperture circumscribing the array. Clearly, some minimum value of the MTF exists below which spatial information cannot be retrieved in the presence of noise. The MTF thus becomes the image quality criteria of choice for those applications where fine detail is required from extended objects. Phased telescope arrays also suffer from severe field-of-view limitations (perhaps as small as a few tens of seconds of arc) due to both pupil-mapping errors and the somewhat benign field curvature of the individual telscopes making up the array. This rapid degradation of off-axis optical performance affects target acquisition and tracking as well as imaging applications.

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Raporty organizacyjne na temat "Small aperture active phased array"

Axford, Jr, i Roy A. Ultra Small Aperture Terminal (USAT) Phased Array Technology Demonstrator. Fort Belvoir, VA: Defense Technical Information Center, listopad 2003. http://dx.doi.org/10.21236/ada460178.

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