Results 81 to 90 of about 167,469,029 (193)

Anhydrous minerals in asteroid Bennu: Evidence for well‐preserved primordial components

Meteoritics &Planetary Science, Volume 61, Issue 6, Page 963-986, June 2026.
Abstract Aqueously altered carbonaceous astromaterials are dominated by secondary minerals, but a minor fraction of primary, anhydrous silicates and oxides escape alteration, offering insight into the original composition of asteroid parent bodies. We report the mineralogy, petrology, mineral chemistry, and oxygen isotopes of anhydrous minerals—50 ...
S. S. Russell, I. A. Franchi, T. Salge, X. Zhao, R. H. Jones, A. J. King, N. V. Almeida, P. F. Schofield, H. C. Bates, E. A. Cortes‐Calderon, N. Kawasaki, Y. Yurimoto, Y. Marrocchi, G. Libourel, K. Thomas‐Keprta, L. P. Keller, K. Righter, T. J. McCoy, T. J. Zega, J. J. Barnes, A. N. Nguyen, S. Tachibana, H. C. Connolly Jr, D. S. Lauretta   +23 more
wiley   +1 more source

A Compact Angle-of-Arrival Tracking System for Free-Space Optical Communication Systems

, 2020
We propose a compact angle-of-arrival (AoA) tracking system without requiring the beacon light. The proofof-concept experimental demonstration shows that the proposed system improves the tolerance to AoA fluctuations by ~3 ...
Kim, Hoon, Hoon Kim, Vuong V. Mai, Mai, Vuong V   +3 more
core   +1 more source

A Fuzzy-Based Angle-of-Arrival Estimation System (AES) Using Radiation Pattern Reconfigurable (RPR) Antenna and Modified Gaussian Membership Function

IEEE Access, 2019
Angle-of-arrival (AOA) estimation is an important factor in various wireless sensing applications, especially localization systems. This paper proposes a new type of AOA estimation sensor node, known as AOA-estimation system (AES) where the received ...
Mohd Ilman Jais, Thennarasan Sabapathy, Muzammil Jusoh, R. Badlishah Ahmad, Mohd Haizal Jamaluddin, Muhammad Ramlee Kamarudin, Phaklen Ehkan, L. Murukesan Loganathan, Ping Jack Soh   +8 more
doaj   +1 more source

Utilizing AoA for Decision Gathering in Optical Wireless Sensor Networks

Journal of Sensor and Actuator Networks
Optical Wireless Sensor Networks (OWSNs) have emerged as a promising solution for energy-efficient and secure data collection in free-space optical (FSO) environments.
Abdullah Alhasanat, Ahed Aleid, Abdelrahman Abushattal, Amal Alhasanat, Umar Raza   +4 more
doaj   +1 more source

A Joint Decoherence-Based AOA and TDOA Positioning Approach for Interference Monitoring in Global Navigation Satellite System

Applied Sciences
Global navigation satellite system (GNSS) has been widely used in many fields due to their low cost and high positioning accuracy. Because of the open frequency of navigation signals, the low power of navigation signals, and the growing reliance of many ...
Wenjian Wang, Yinghong Wen, Yongxia Liu
doaj   +1 more source

Angle of arrival estimation of on-body channels

, 2007
Angle of arrival (AoA) estimation has been performed on five on-body channels, namely belt-to-chest, belt-to-wrist, belt-to-ankle, belt-to-head and belt-to-back.
P.S. Hall, Y.I. Nechayev, Nechayev, Y. I., Hall, Peter, Nechayev, Yuriy, Kamarudin, Muhammad Ramlee, Hall, P. S., Kamarudin, MR, M.R. Kamarudin   +8 more
core   +1 more source

Benefits and Impact of Joint Metric of AOA/RSS/TOF on Indoor Localization Error

Applied Sciences, 2016
The emerging techniques in the Fifth Generation (5G) communication system, like the millimeter-Wave (mmWave) and massive Multiple Input Multiple Output (MIMO), make it possible to measure the Angle-Of-arrival (AOA), Receive Signal Strength (RSS) and Time-
Qing Jiang, Feng Qiu, Mu Zhou, Zengshan Tian   +3 more
doaj   +1 more source

Nonisotropic Scattering Characteristic in an Alternant Tree-Blocked Viaduct Scenario on High-Speed Railway at 2.35 GHz

International Journal of Antennas and Propagation, 2014
This paper presents the nonisotropic scattering characteristic of the mobile radio channel in an alternant tree-blocked viaduct scenario on high-speed railway (HSR) by real field measuring at 2.35 GHz.
Rongchen Sun, Cheng Tao, Liu Liu, Zhenhui Tan, Lingwen Zhang, Tao Zhou   +5 more
doaj   +1 more source

Characterization of Multipath Effects in Indoor Positioning Systems by AoA and PoA Based on Optical Signals

Sensors, 2019
In this paper, we characterize and measure the effects of the errors introduced by the multipath when obtaining the position of an agent by means of Indoor Positioning Systems (IPS) based on optical signal.
Álvaro De-La-Llana-Calvo, José-Luis Lázaro-Galilea, Alfredo Gardel-Vicente, David Rodríguez-Navarro, Ignacio Bravo-Muñoz, Felipe Espinosa-Zapata   +5 more
doaj   +1 more source

Adaptive angle of arrival estimation for multiuser wireless location systems

Reliable positioning of CDMA cellular users in a mobile environment relies on accurate knowledge of the time-of-arrival (TOA) and angle-of-arrival (AOA) of the first arriving ray.
Sayed, Ali H., Khajehnouri, N.
core   +1 more source