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L Band Phased Array Feed Noise Figure and Radiation Efficiency Measurement with the Antenna Y Factor Method 天线Y因子法测量L波段相控阵馈电噪声图及辐射效率
IF 1.3 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2023-01-17 DOI: 10.1142/s2251171723500022
M. Burnett, David Buck, Nathaniel Ashcraft, Spencer M. Ammermon, B. Jeffs, K. Warnick
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引用次数: 1
An Image Auto-Guider System for Kodaikanal Tower Tunnel Telescope Kodaikanal塔式隧道望远镜图像自动导引系统
IF 1.3 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2023-01-17 DOI: 10.1142/s2251171723500034
H. Mathur, K. C. Thulasidharen, H. Pruthvi, K. Nagaraju, M. Rajalingam
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引用次数: 0
The Scientific Investigation of Unidentified Aerial Phenomena (UAP) Using Multimodal Ground-based Observatories 利用多模式地面观测站对不明空中现象(UAP)进行科学调查
IF 1.3 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2023-01-12 DOI: 10.1142/S2251171723400068
W. Watters, A. Loeb, F. Laukien, Richard Cloete, A. Delacroix, Sergei Dobroshinsky, Benjamin Horvath, Ezra Kelderman, Sarah Little, Eric Masson, Andy Mead, M. Randall, Forrest Schultz, Matthew Szenher, F. Vervelidou, Abigail White, A. Ahlstrom, Carol Cleland, S. Dockal, N. Donahue, Mark Elowitz, Carson Ezell, Alex Gersznowicz, Nicholas Gold, Michael G. Hercz, E. Keto, K. Knuth, A. Lux, G. Melnick, A. Moro-Martin, J. Martín‐Torres, Daniel Llusa Ribes, P. Sail, M. Teodorani, J. Tedesco, Gerald Thomas Tedesco, M. Tu, M. Zorzano
(Abridged) Unidentified Aerial Phenomena (UAP) have resisted explanation and have received little formal scientific attention for 75 years. A primary objective of the Galileo Project is to build an integrated software and instrumentation system designed to conduct a multimodal census of aerial phenomena and to recognize anomalies. Here we present key motivations for the study of UAP and address historical objections to this research. We describe an approach for highlighting outlier events in the high-dimensional parameter space of our census measurements. We provide a detailed roadmap for deciding measurement requirements, as well as a science traceability matrix (STM) for connecting sought-after physical parameters to observables and instrument requirements. We also discuss potential strategies for deciding where to locate instruments for development, testing, and final deployment. Our instrument package is multimodal and multispectral, consisting of (1) wide-field cameras in multiple bands for targeting and tracking of aerial objects and deriving their positions and kinematics using triangulation; (2) narrow-field instruments including cameras for characterizing morphology, spectra, polarimetry, and photometry; (3) passive multistatic arrays of antennas and receivers for radar-derived range and kinematics; (4) radio spectrum analyzers to measure radio and microwave emissions; (5) microphones for sampling acoustic emissions in the infrasonic through ultrasonic frequency bands; and (6) environmental sensors for characterizing ambient conditions (temperature, pressure, humidity, and wind velocity), as well as quasistatic electric and magnetic fields, and energetic particles. The use of multispectral instruments and multiple sensor modalities will help to ensure that artifacts are recognized and that true detections are corroborated and verifiable.
(节录)75年来,不明空中现象(UAP)一直难以得到解释,也很少得到正式的科学关注。伽利略项目的一个主要目标是建立一个集成的软件和仪器系统,用于对空中现象进行多模态普查并识别异常。在这里,我们提出了UAP研究的主要动机,并解决了历史上对这项研究的反对意见。我们描述了一种在我们的普查测量的高维参数空间中突出异常事件的方法。我们提供详细的路线图来决定测量需求,以及科学可追溯性矩阵(STM),用于将受欢迎的物理参数与可观测值和仪器要求联系起来。我们还讨论了决定在哪里定位用于开发、测试和最终部署的仪器的潜在策略。我们的仪器包是多模态和多光谱的,包括:(1)多波段的宽视场相机,用于瞄准和跟踪空中物体,并使用三角测量法获得它们的位置和运动学;(2)窄视场仪器,包括用于表征形貌、光谱、偏振法和光度法的照相机;(3)用于雷达衍生距离和运动学的无源多静态天线和接收机阵列;(四)无线电频谱分析仪,用于测量无线电和微波发射;(5)通过超声波频段对次声发射进行采样的传声器;(6)用于表征环境条件(温度、压力、湿度和风速)、准静态电场和磁场以及高能粒子的环境传感器。多光谱仪器和多种传感器模式的使用将有助于确保识别人工制品,并证实和核实真实的检测结果。
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引用次数: 1
SkyWatch: A Passive Multistatic Radar Network for the Measurement of Object Position and Velocity SkyWatch:用于测量物体位置和速度的无源多基地雷达网络
IF 1.3 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2022-12-08 DOI: 10.1142/S2251171723400044
M. Randall, A. Delacroix, Carson Ezell, Ezra Kelderman, Sarah Little, A. Loeb, Eric Masson, W. Watters, Richard Cloete, A. White
(Abridged) Quantitative three-dimensional (3D) position and velocity estimates obtained by passive radar will assist the Galileo Project in the detection and classification of aerial objects by providing critical measurements of range, location, and kinematics. These parameters will be combined with those derived from the Project{textquoteright}s suite of electromagnetic sensors and used to separate known aerial objects from those exhibiting anomalous kinematics. SkyWatch, a passive multistatic radar system based on commercial broadcast FM radio transmitters of opportunity, is a network of receivers spaced at geographical scales that enables estimation of the 3D position and velocity time series of objects at altitudes up to 80km, horizontal distances up to 150km, and at velocities to {textpm}2{textpm}2km/s ({textpm}6{textpm}6Mach). The receivers are designed to collect useful data in a variety of environments varying by terrain, transmitter power, relative transmitter distance, adjacent channel strength, etc. In some cases, the direct signal from the transmitter may be large enough to be used as the reference with which the echoes are correlated. In other cases, the direct signal may be weak or absent, in which case a reference is communicated to the receiver from another network node via the internet for echo correlation. Various techniques are discussed specific to the two modes of operation and a hybrid mode. Delay and Doppler data are sent via internet to a central server where triangulation is used to deduce time series of 3D positions and velocities. A multiple receiver (multistatic) radar experiment is undergoing Phase 1 testing, with several receivers placed at various distances around the Harvard{textendash}Smithsonian Center for Astrophysics (CfA), to validate full 3D position and velocity recovery.
(摘要)被动雷达获得的定量三维位置和速度估计将通过提供距离、位置和运动学的关键测量,帮助伽利略项目探测和分类空中物体。这些参数将与项目电磁传感器套件中得出的参数相结合,用于将已知的航空物体与表现出异常运动学的物体分离。SkyWatch是一种基于商业广播调频无线电发射机的无源多基地雷达系统,是一个在地理尺度上间隔开的接收器网络,能够估计高度高达80公里、水平距离高达150公里、速度高达2公里/秒(6马赫)的物体的3D位置和速度时间序列。接收器被设计为在因地形、发射器功率、相对发射器距离、相邻信道强度等而变化的各种环境中收集有用的数据。在一些情况下,来自发射器的直接信号可能足够大,可以用作回波相关的参考。在其他情况下,直接信号可能较弱或不存在,在这种情况下,参考通过互联网从另一个网络节点传送到接收器,用于回声相关性。针对两种操作模式和混合模式讨论了各种技术。延迟和多普勒数据通过互联网发送到中央服务器,在那里三角测量用于推断3D位置和速度的时间序列。一个多接收器(多基地)雷达实验正在进行第一阶段测试,在哈佛史密森天体物理中心(CfA)周围的不同距离放置了几个接收器,以验证完整的3D位置和速度恢复。
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引用次数: 2
Cumulative Author Index — Volume 11 (2022) 累积作者指数——第11卷(2022)
IF 1.3 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2022-12-01 DOI: 10.1142/s225117172299001x
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引用次数: 0
ARIES 130-cm Devasthal Fast Optical Telescope - Operation and Outcome 白羊座130厘米毁灭性快速光学望远镜-操作和结果
IF 1.3 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2022-11-24 DOI: 10.1142/s2251171722400049
Y. Joshi, T. Bangia, M. Jaiswar, J. Pant, K. Reddy, S. Yadav
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引用次数: 4
First Light Preparations of the 4m ILMT 4m ILMT的首光准备
IF 1.3 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2022-11-16 DOI: 10.1142/s2251171722400037
B. Kumar, H. Kumar, Khushal Singh Dangwal, Himanshu Rawat, K. Misra, Vibhore Negi, M. Jaiswar, Naveen Dukiya, B. Ailawadhi, P. Hickson, J. Surdej
The 4[Formula: see text]m International Liquid Mirror Telescope (ILMT) is a zenith-pointing optical observing facility at ARIES Devasthal observatory (Uttarakhand, India). The first light preparatory activities of the ILMT were accomplished in April 2022 followed by on-sky tests that were carried out at the beginning of May 2022. This telescope will perform a multi-band optical (SDSS [Formula: see text], [Formula: see text] and [Formula: see text]) imaging of a narrow strip ([Formula: see text]) of sky utilizing the time-delayed integration technique. Single-scan ILMT images have an integration time of 102[Formula: see text]s and consecutive-night images can be co-added to further improve the signal-to-noise ratio. An image subtraction technique will also be applied to the nightly recorded observations in order to detect transients, objects exhibiting variations in flux or position. Presently, the facility is in the commissioning phase and regular operation will commence in March 2023. This paper presents a discussion of the main preparation activities before first light, along with preliminary results obtained.
4[公式:见正文]m国际液镜望远镜(ILMT)是ARIES Devasthal天文台(印度北阿坎德邦)的一个指向天顶的光学观测设施。ILMT的第一次灯光准备活动于2022年4月完成,随后于2022年5月初进行了天空测试。该望远镜将利用时间延迟积分技术对天空的窄带([公式:见正文])进行多波段光学成像(SDSS[公式:参见正文]、[公式:请见正文]和[公式:详见正文])。单次扫描ILMT图像的积分时间为102[公式:见正文],可以共同添加连续的夜间图像,以进一步提高信噪比。图像相减技术也将应用于夜间记录的观测,以检测瞬态,即通量或位置变化的物体。目前,该设施正处于调试阶段,将于2023年3月开始正常运行。本文讨论了初亮前的主要准备活动,以及获得的初步结果。
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引用次数: 8
Parameters of a short dipole antenna placed over a two-layer lunar soil 放置在两层月球土壤上的短偶极天线的参数
IF 1.3 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2022-11-14 DOI: 10.1142/s2251171723500010
P. Tokarsky
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引用次数: 1
A Hardware and Software Platform for Aerial Object Localization 空中目标定位的硬件和软件平台
IF 1.3 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2022-11-04 DOI: 10.1142/S2251171723400020
Matthew Szenher, A. Delacroix, E. Keto, Sarah Little, M. Randall, W. Watters, Eric Masson, Richard Cloete
To date, there are little reliable data on the position, velocity and acceleration characteristics of Unidentified Aerial Phenomena (UAP). The dual hardware and software system described in this document provides a means to address this gap. We describe a weatherized multi-camera system which can capture images in the visible, infrared and near infrared wavelengths. We then describe the software we will use to calibrate the cameras and to robustly localize objects-of-interest in three dimensions. We show how object localizations captured over time will be used to compute the velocity and acceleration of airborne objects.
迄今为止,关于不明飞行现象的位置、速度和加速度特性的可靠数据很少。本文件中描述的双硬件和软件系统提供了解决这一差距的方法。我们描述了一种可在可见光、红外和近红外波长下拍摄图像的耐候多摄像头系统。然后,我们描述了将用于校准相机和在三维中稳健定位感兴趣对象的软件。我们展示了如何使用随时间捕获的物体定位来计算空中物体的速度和加速度。
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引用次数: 2
First Lunar Occultation Results with the TIRCAM2 Near-Infrared Imager at the Devasthal 3.6-m Telescope Devasthal 3.6米望远镜TIRCAM2近红外成像仪的首次月球掩星结果
IF 1.3 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2022-11-03 DOI: 10.1142/s2251171722400025
Saurabh Sharma, A. Richichi, D. Ojha, B. Kumar, M. Naik, Jeewan Rawat, Darshan Bora, Kuldeep Belwal, Prakash Dhami, M. Bisht
TIRCAM2 is the facility near-infrared Imager at the Devasthal 3.6-m telescope in northern India, equipped with an Aladdin III InSb array detector. We have pioneered the use of TIRCAM2 for very fast photometry, with the aim of recording Lunar Occultations (LO). This mode is now operational and publicly offered. In this paper we describe the relevant instrumental details, we provide references to the LO method and the underlying data analysis procedures, and we list the LO events recorded so far. Among the results, we highlight a few which have led to the measurement of one small-separation binary star and of two stellar angular diameters. We conclude with a brief outlook on further possible instrumental developments and an estimate of the scientific return. In particular, we find that the LO technique can detect sources down to K ≈ 9mag with SNR=1 on the DOT telescope. Angular diameters larger than ≈ 1milliarcsecond (mas) could be measured with SNR above 10, or K ≈ 6mag. These numbers are only an indication and will depend strongly on observing conditions such as lunar phase and rate of lunar limb motion. Based on statistics alone, there are several thousands LO events observable in principle with the given telescope and instrument every year.
TIRCAM2是印度北部Devasthal 3.6米望远镜的近红外成像仪,配备了阿拉丁III InSb阵列探测器。我们率先使用TIRCAM2进行非常快速的测光,目的是记录月球掩星(LO)。该模式现已投入运行并公开发布。在本文中,我们描述了相关的仪器细节,我们提供了LO方法和基本数据分析程序的参考,并列出了迄今为止记录的LO事件。在这些结果中,我们强调了一些导致测量一颗小分离双星和两颗恒星角直径的结果。最后,我们对未来可能的仪器发展进行了简要展望,并对科学回报进行了估计。特别是,我们发现LO技术可以在DOT望远镜上检测到低至K≈9mag的源,SNR=1。在信噪比大于10或K≈6mag的情况下,可以测量大于≈1milliarcsecond(mas)的角直径。这些数字只是一个指示,将在很大程度上取决于观测条件,如月相和月翼运动速率。仅根据统计数据,原则上每年都有数千个LO事件可以用给定的望远镜和仪器观测到。
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引用次数: 2
期刊
Journal of Astronomical Instrumentation
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