发布求助
文献互助 智能选刊 最新文献

Journal of Astronomical Instrumentation最新文献

筛选
英文 中文
Performance Analysis Techniques for Real-time Broadband RFI Filtering System of uGMRT uGMRT实时宽带RFI滤波系统性能分析技术
IF 1.3
Journal of Astronomical Instrumentation Pub Date : 2022-03-01 DOI: 10.1142/S2251171722500088
K. Buch, R. Kale, K. Naik, Rahul Aragade, M. Muley, S. Kudale, Ajith Kumar
{"title":"Performance Analysis Techniques for Real-time Broadband RFI Filtering System of uGMRT","authors":"K. Buch, R. Kale, K. Naik, Rahul Aragade, M. Muley, S. Kudale, Ajith Kumar","doi":"10.1142/S2251171722500088","DOIUrl":"https://doi.org/10.1142/S2251171722500088","url":null,"abstract":"Electromagnetic radiation from human activities, known as man-made Radio Frequency Interference (RFI), adversely affects radio astronomy observations. In the vicinity of the Upgraded Giant Metrewave Radio Telescope (uGMRT) array, the sparking on power lines is the major cause of interference at observing frequencies less than 800 MHz. A real-time broadband RFI detection and filtering system is implemented as part of the uGMRT wideband signal processing backend to mitigate the effect of broadband RFI. Performance analysis techniques used for testing and commissioning the system for observations in the beamformer and correlator modes of the uGMRT are presented. The concept and implementation of recording simultaneous unfiltered and filtered data along with data analysis and interpretation is illustrated using an example. For the beamformer mode, spectrogram, single spectral channel, and its Fourier transform is used for performance analysis whereas, in the correlator mode, the cross-correlation function, closure phase, and visibilities from the simultaneously recorded unfiltered and filtered is carried out. These techniques are used for testing the performance of the broadband RFI filter and releasing it for uGMRT users.","PeriodicalId":45132,"journal":{"name":"Journal of Astronomical Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48310753","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
SDR Pathfinder for Understanding Transient and Noise-level Interference in the Karoo (SPUTNIK) 用于理解Karoo中瞬态和噪声级干扰的SDR探路者(SPUTNIK)
IF 1.3
Journal of Astronomical Instrumentation Pub Date : 2022-01-31 DOI: 10.1142/s2251171722500064
A. Josaitis, D. DeBoer, E. de Lera Acedo
{"title":"SDR Pathfinder for Understanding Transient and Noise-level Interference in the Karoo (SPUTNIK)","authors":"A. Josaitis, D. DeBoer, E. de Lera Acedo","doi":"10.1142/s2251171722500064","DOIUrl":"https://doi.org/10.1142/s2251171722500064","url":null,"abstract":"","PeriodicalId":45132,"journal":{"name":"Journal of Astronomical Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49231850","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
Mersenne Beam-compressor with Field-flattener optics as Main Telescope design for Extremely Large Telescopes and Telescope Arrays 超大望远镜和望远镜阵列的主望远镜设计与场平坦光学的梅森光束压缩器
IF 1.3
Journal of Astronomical Instrumentation Pub Date : 2022-01-31 DOI: 10.1142/s2251171722500052
Nishant Neeraj Gadey
{"title":"Mersenne Beam-compressor with Field-flattener optics as Main Telescope design for Extremely Large Telescopes and Telescope Arrays","authors":"Nishant Neeraj Gadey","doi":"10.1142/s2251171722500052","DOIUrl":"https://doi.org/10.1142/s2251171722500052","url":null,"abstract":"","PeriodicalId":45132,"journal":{"name":"Journal of Astronomical Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42291947","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
A Digital Calibration Source for 21cm Cosmology Telescopes 21cm宇宙学望远镜的数字校准源
IF 1.3
Journal of Astronomical Instrumentation Pub Date : 2022-01-27 DOI: 10.1142/S2251171722500167
Kalyani B. Bhopi, W. Tyndall, P. Sanghavi, K. Bandura, L. Newburgh, Jason Gallichio
{"title":"A Digital Calibration Source for 21cm Cosmology Telescopes","authors":"Kalyani B. Bhopi, W. Tyndall, P. Sanghavi, K. Bandura, L. Newburgh, Jason Gallichio","doi":"10.1142/S2251171722500167","DOIUrl":"https://doi.org/10.1142/S2251171722500167","url":null,"abstract":"Foreground mitigation is critical to all next-generation radio interferometers that target cosmology using the redshifted neutral hydrogen 21 cm emission line. Attempts to remove this foreground emission have led to new analysis techniques as well as new developments in hardware specifically dedicated to instrument beam and gain calibration, including stabilized signal injection into the interferometric array and drone-based platforms for beam mapping. The radio calibration sources currently used in the literature are broad-band incoherent sources that can only be detected as excess power and with no direct sensitivity to phase information. In this paper, we describe a digital radio source which uses Global Positioning Satellite (GPS) derived time stamps to form a deterministic signal that can be broadcast from an aerial platform. A copy of this source can be deployed locally at the instrument correlator such that the received signal from the aerial platform can be correlated with the local copy, and the resulting correlation can be measured in both amplitude and phase for each interferometric element. We define the requirements for such a source, describe an initial implementation and verification of this source using commercial Software Defined Radio boards, and present beam map slices from antenna range measurements using the commercial boards. We found that the commercial board did not meet all requirements, so we also suggest future directions using a more sophisticated chipset.","PeriodicalId":45132,"journal":{"name":"Journal of Astronomical Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49382485","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: 2
Cumulative Author Index Volume 10 (2021) 累积作者索引第10卷(2021年)
IF 1.3
Journal of Astronomical Instrumentation Pub Date : 2021-12-01 DOI: 10.1142/s2251171721990014
{"title":"Cumulative Author Index Volume 10 (2021)","authors":"","doi":"10.1142/s2251171721990014","DOIUrl":"https://doi.org/10.1142/s2251171721990014","url":null,"abstract":"","PeriodicalId":45132,"journal":{"name":"Journal of Astronomical Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45719581","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
Improvements to the Search for Cosmic Dawn Using the Long Wavelength Array 长波阵列对宇宙黎明探测的改进
IF 1.3
Journal of Astronomical Instrumentation Pub Date : 2021-11-26 DOI: 10.1142/S225117172150015X
C. Dilullo, J. Dowell, G. Taylor
{"title":"Improvements to the Search for Cosmic Dawn Using the Long Wavelength Array","authors":"C. Dilullo, J. Dowell, G. Taylor","doi":"10.1142/S225117172150015X","DOIUrl":"https://doi.org/10.1142/S225117172150015X","url":null,"abstract":"We present recent improvements to the search for the global Cosmic Dawn signature using the Long Wavelength Array station located on the Sevilleta National Wildlife Refuge in New Mexico, USA (LWA–SV). These improvements are both in the methodology of the experiment and the hardware of the station. An improved observing strategy along with more sophisticated temperature calibration and foreground modelling schemes have led to improved residual RMS limits. A large improvement over previous work using LWA–SV is the use of a novel achromatic beamforming technique which has been developed for LWA–SV. We present results from an observing campaign which contains 29 days of observations between March 10, 2021 and April 1","PeriodicalId":45132,"journal":{"name":"Journal of Astronomical Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45341931","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
Compact Scintillator Array Detector (ComSAD) for sounding rocket and CubeSat missions 用于探空火箭和立方体卫星任务的紧凑型闪烁体阵列探测器(ComSAD)
IF 1.3
Journal of Astronomical Instrumentation Pub Date : 2021-10-24 DOI: 10.1142/S2251171722500076
Pusen Wang, Chih-Yun Chen, Hsiang-Chieh Hsu, Mu-Hsin Chang, W. Liu, H. Fang, Ting-Chou Wu, Wen-hao Chen, Chin Cheng Tsai, A. Chen, Yi Yang
{"title":"Compact Scintillator Array Detector (ComSAD) for sounding rocket and CubeSat missions","authors":"Pusen Wang, Chih-Yun Chen, Hsiang-Chieh Hsu, Mu-Hsin Chang, W. Liu, H. Fang, Ting-Chou Wu, Wen-hao Chen, Chin Cheng Tsai, A. Chen, Yi Yang","doi":"10.1142/S2251171722500076","DOIUrl":"https://doi.org/10.1142/S2251171722500076","url":null,"abstract":"The development of CubeSats and more frequent launch chances of sounding rockets are a total game changer to the space program, and it allows us to build space instruments that are technologically feasible and a ff ordable. Therefore, it gives us a good opportunity to build a small cosmic-ray detector which has capabilities to measure the flux, direction, and even energy of cosmic rays at an altitude above the limitation of balloon experiments, and it may open a new door for building a constellation of detectors to study cosmic-ray physics. Compact Scintillator Array Detector (ComSAD) is a funded sounding rocket mission of Taiwan’s National Space Organization. In this paper, we present the concept, design, and performance of ComSAD which is also suitable for future CubeSat missions.","PeriodicalId":45132,"journal":{"name":"Journal of Astronomical Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42630136","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
Performance of Oversampled Polyphase Filterbank Inversion Via Fourier Transform: Continuous Signals 过采样多相滤波器组傅立叶变换反转性能:连续信号
IF 1.3
Journal of Astronomical Instrumentation Pub Date : 2021-10-09 DOI: 10.1142/s2251171721500148
J. Bunton, G. Comoretto, I. Morrison, D. C. Shaff, A. Deller, W. van Straten, A. Jameson
{"title":"Performance of Oversampled Polyphase Filterbank Inversion Via Fourier Transform: Continuous Signals","authors":"J. Bunton, G. Comoretto, I. Morrison, D. C. Shaff, A. Deller, W. van Straten, A. Jameson","doi":"10.1142/s2251171721500148","DOIUrl":"https://doi.org/10.1142/s2251171721500148","url":null,"abstract":"","PeriodicalId":45132,"journal":{"name":"Journal of Astronomical Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47873657","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
Wide field Beamformed Observation with MeerKAT MeerKAT的宽视场波束形成观测
IF 1.3
Journal of Astronomical Instrumentation Pub Date : 2021-10-01 DOI: 10.1142/S2251171721500136
Weiwei Chen, E. Barr, R. Karuppusamy, Michael Kramer, B. Stappers
{"title":"Wide field Beamformed Observation with MeerKAT","authors":"Weiwei Chen, E. Barr, R. Karuppusamy, Michael Kramer, B. Stappers","doi":"10.1142/S2251171721500136","DOIUrl":"https://doi.org/10.1142/S2251171721500136","url":null,"abstract":"Large-scale beamforming with radio interferometers has the potential to revolutionize the science done with pulsars and fast radio bursts by improving the survey efficiency for these sources. We describe a wide-field beamformer for the MeerKAT radio telescope and outline strategies to optimally design such surveys. A software implementation of these techniques, Mosaic is introduced and its application in the MeerKAT telescope is presented. We show initial results using the beamformer by observing a globular cluster to track several pulsars simultaneously and demonstrate the source localization capability of this observation.","PeriodicalId":45132,"journal":{"name":"Journal of Astronomical Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43994689","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
Radio antenna design for sky-averaged 21 cm cosmology experiments: the REACH case 天空平均21厘米宇宙学实验的无线电天线设计:REACH案例
IF 1.3
Journal of Astronomical Instrumentation Pub Date : 2021-09-21 DOI: 10.1142/s2251171722500015
J. Cumner, E. Acedo, D. Villiers, D. Anstey, C. Kolitsidas, B. Gurdon, N. Fagnoni, P. Alexander, G. Bernardi, H. Bevins, S. Carey, J. Cavillot, Riccardo Chiello, C. Craeye, W. Croukamp, J. Ely, A. Fialkov, T. Gessey-Jones, Q. Gueuning, Will Handley, R. Hills, A. Josaitis, G. Kulkarni, A. Magro, R. Maiolino, P. Meerburg, S. Mittal, J. Pritchard, E. Puchwein, N. Razavi-Ghods, I. Roque, A. Saxena, K. Scheutwinkel, E. Shen, P. Sims, O. Smirnov, M. Spinelli, K. Zarb-Adami
{"title":"Radio antenna design for sky-averaged 21 cm cosmology experiments: the REACH case","authors":"J. Cumner, E. Acedo, D. Villiers, D. Anstey, C. Kolitsidas, B. Gurdon, N. Fagnoni, P. Alexander, G. Bernardi, H. Bevins, S. Carey, J. Cavillot, Riccardo Chiello, C. Craeye, W. Croukamp, J. Ely, A. Fialkov, T. Gessey-Jones, Q. Gueuning, Will Handley, R. Hills, A. Josaitis, G. Kulkarni, A. Magro, R. Maiolino, P. Meerburg, S. Mittal, J. Pritchard, E. Puchwein, N. Razavi-Ghods, I. Roque, A. Saxena, K. Scheutwinkel, E. Shen, P. Sims, O. Smirnov, M. Spinelli, K. Zarb-Adami","doi":"10.1142/s2251171722500015","DOIUrl":"https://doi.org/10.1142/s2251171722500015","url":null,"abstract":"Following the reported detection of an absorption pro¯le associated with the 21 cm sky-averaged signal from the Cosmic Dawn by the EDGES experiment in 2018, a number of experiments have been set up to verify this result. This paper discusses the design process used for global 21 cm experiments, focusing speci¯cally on the Radio Experiment for the Analysis of Cosmic Hydrogen (REACH). This experiment will seek to understand and compensate for systematic errors present using detailed modeling and characteri-zation of the instrumentation. Detailed quantitative ¯gures of merit and numerical modeling are used to assist the design process of the REACH dipole antenna (one of the two antenna designs for REACH Phase I). This design process produced a 2.5:1 frequency bandwidth dipole. The aim of this design was to balance spectral smoothness and low impedance re°ections with the ability to describe and understand the antenna response to the sky signal to inform the critically important calibration during observation and data analysis.","PeriodicalId":45132,"journal":{"name":"Journal of Astronomical Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44736978","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: 6
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信