Results 31 to 40 of about 547,647 (206)

A Conceptual Investigation of a Large Radio Telescope Support Point Number Effect on Its Pointing Accuracy

International Journal of Antennas and Propagation, 2020
The purpose of this paper is to investigate a large radio telescope support point number effect on its pointing accuracy and provide a useful guideline for the large radio telescope design engineer. In a large radio telescope system, the azimuth track is
Song Xue, Kaitong Ma, Congsi Wang, Peiyuan Lian, Yan Wang, Yuefei Yan, Qian Xu, Yuanpeng Zheng, Na Wang   +8 more
doaj   +1 more source

Learning a Path from Real Navigation: The Advantage of Initial View, Cardinal North and Visuo-Spatial Ability

Brain Sciences, 2020
Background: Spatial cognition research strives to maximize conditions favoring environment representation. This study examined how initial (egocentric) navigation headings interact with allocentric references in terms of world-based information (such as ...
Veronica Muffato, Chiara Meneghetti
doaj   +1 more source

Supernova pointing with low- and high-energy neutrino detectors

, 2003
A future galactic SN can be located several hours before the optical explosion through the MeV-neutrino burst, exploiting the directionality of $\nu$-$e$-scattering in a water Cherenkov detector such as Super-Kamiokande.
A. Burrows, A. Capone, A. S. Dighe, A. Strumia, A.S. Dighe, A.S. Dighe, A.S. Dighe, C. Lunardini, C. Lunardini, C. Spiering, C.R. Rao, D. Semikoz, E. Anassontzis, E. Kolbe, E. Waxman, E.V. Derishev, F. Halzen, G. G. Raffelt, J. H. Beall, J.F. Beacom, K. Langanke, K. Takahashi, M. Apollonio, M. Kachelrieß, M. Nakahata, M.C. Gonzalez-Garcia, M.T. Keil, R. Tomàs, R.A. Fisher, S. Ando, T. Totani, V.S. Berezinsky, W.C. Haxton   +32 more
core   +1 more source

Beyond Vertical Point Accuracy

, 2021
Quantitative geomorphic research depends on accurate topographic data often collected via remote sensing. Lidar, and photogrammetric methods like structure-from-motion, provide the highest quality data for generating digital elevation models (DEMs).
Purinton, Benjamin (Dr.), Bookhagen, Bodo (Prof. Dr.)   +1 more
openaire   +2 more sources

Re-Optimized Design for the ADR-Based Dual-Loop Controller of 100 m Class Aperture Radio Telescope

Machines
Pointing accuracy is a crucial performance index for a fully steerable large-aperture radio telescope and is subject to external and internal disturbances.
Ning Li, Qian Xu, Na Wang, Zhiyong Liu
doaj   +1 more source

Error modeling and analysis of optomechanical platform based on multi-system theory

AIP Advances, 2020
The quality of camera imaging is of great significance in aerial photography and space target detection, especially in the fields of military reconnaissance and geographic resource telemetry.
Dongxue Wang, Zhanguo Li, Jieqiong Lin, Mingming Lu, Yingchun Li   +4 more
doaj   +1 more source

Pointing-Error Correction of Optical Communication Terminals on Motion Platforms Based on a K-Nearest Neighbor Algorithm

IEEE Photonics Journal, 2022
High-precision pointing is a key technology in free-space optical communication, as it improves the acquisition probability and reduces the acquisition time.
Chao Peng, Dong He, Yongmei Huang, Yuankang Wang, Zihao Wang, Qiang Wang, Xiang Liu, Haotong Ma   +7 more
doaj   +1 more source

Lyot-based Ultra-Fine Pointing Control System for Phase Mask Coronagraphs

, 2013
High performance coronagraphic imaging at small inner working angle requires efficient control of low order aberrations. The absence of accurate pointing control at small separation not only degrades coronagraph starlight rejection but also increases the
Baudoz, Pierre, Clergeon, Christophe, Guyon, Olivier, Martinache, Frantz, Matsuo, Taro, Singh, Garima   +5 more
core   +1 more source

A novel testing method of beam pointing accuracy for high-power laser facility

Nuclear Engineering and Technology
Pointing shots are typically used to test the beam pointing accuracy of high-power laser facilities. This paper proposes a new method for measuring pointing accuracy by utilizing visible light generated during the low-energy laser interaction with a test
Xiaolu Zhang, Lu Zhang, Song Gao, Huaiwen Guo, Jun Zhang, Junpu Zhao, Pin Yang, Longfei Jing, Ping Li, Wei Zhou   +9 more
doaj   +1 more source

Multi-level fine pointing test-bed for space applications [PDF]

, 2012
For space applications that need high accuracy pointing of the payload, fine pointing system is an indispensable tool. To reach high level of high accuracy pointing and tracking, proper synchronization between the attitude of the satellite and each stage
Bérard, Caroline, Defaÿ, François, Vongsantivanich, Wasanchai   +2 more
core