Results 41 to 50 of about 1,235,187 (346)

A Geometry-Based Modelling Approach for the Line-of-Sight Probability in UAV Communications

IEEE Open Journal of the Communications Society
This paper presents a geometry-based three-dimensional Probability of Line of Sight $(P_{\mathrm {LoS}})$ model for generic urban environments. The existing $P_{\mathrm {LoS}}$ models are mostly empirical, based on measurements or ray-tracing ...
Abdul Saboor, E. Vinogradov, Zhuangzhuang Cui, A. Al-Hourani, Sofie Pollin   +4 more
semanticscholar   +1 more source

Line-of-sight path-following control utilizing an extended Kalman filter for estimation of speed and course over ground from GNSS positions

Journal of Marine Science and Technology, 2022
Path-following control systems for ships can be designed using both heading and course angle autopilots in conjunction with a proportional line-of-sight (LOS) guidance law.
T. Fossen
semanticscholar   +1 more source

Volatile-Rich Circumstellar Gas in the Unusual 49 Ceti Debris Disk

, 2014
We present Hubble Space Telescope STIS far-UV spectra of the edge-on disk around 49 Ceti, one of the very few debris disks showing sub-mm CO emission.
Grady, Carol A., Kamp, Inga, Roberge, Aki, Weinberger, Alycia J., Welsh, Barry Y.   +4 more
core   +1 more source

Unusually Weak Diffuse Interstellar Bands toward HD 62542 [PDF]

, 2001
As part of an extensive survey of diffuse interstellar bands (DIBs), we have obtained optical spectra of the moderately reddened B5V star HD 62542, which is known to have an unusual UV extinction curve of the type usually identified with dark clouds. The
Adamson A. J., Benjamin J. McCall, Cami J., Daniel E. Welty, Donald G. York, Ehrenfreund P., Gredel R., Gredel R., Gredel R., Heger M. L., Jenniskens P., Jenniskens P., Jenniskens P., Julie Thorburn, Kerr T. H., Krelowski J., L. M. Hobbs, Leger A., Paule Sonnentrucker, Sarre P. J., Snow T. P., Snow T. P., Sonnentrucker P., Sonnentrucker P., Theodore P. Snow, van der Zwet G. P., Walker D. D.   +26 more
core   +3 more sources

Lines of sight [PDF]

Social Identities, 2018
This special issue of Social Identities originated in a workshop, held in Sydney in 2016, as part of the research project, Old Atrocities, New Media.
openaire   +1 more source

Inertial measurement unit–aided dual-frequency radio frequency identification localization in line-of-sight and non-line-of-sight hybrid environment

International Journal of Distributed Sensor Networks, 2018
The mitigation of non-line-of-sight propagation conditions is one of main challenges in wireless signal–based indoor localization. When radio frequency identification localization technology is applied in applications, the received signal strength ...
Jie Wu, Minghua Zhu, Bo Xiao, Wei He
doaj   +1 more source

Cosmological Constraints from the Anisotropic Clustering Analysis using BOSS DR9

, 2013
Our observations of the Universe are fundamentally anisotropic, with data from galaxies separated transverse to the line of sight coming from the same epoch while that from galaxies separated parallel to the line of sight coming from different times ...
Linder, Eric V., Oh, MinJi, Okumura, Teppei, Sabiu, Cristiano G., Song, Yong-Seon   +4 more
core   +1 more source

New Insights on Interstellar Gas-Phase Iron [PDF]

, 2007
In this paper, we report on the gas-phase abundance of singly-ionized iron (Fe II) for 51 lines of sight, using data from the Far Ultraviolet Spectroscopic Explorer (FUSE).
Adam G. Jensen, Aiello S., de Boer K. S., Garmany C. D., Gredel R., Gredel R., Jensen A. G., Neckel T., Snow T. P., Snow T. P., Theodore P. Snow   +10 more
core   +1 more source

A mobile localization method based on a robust extend Kalman filter and improved M-estimation in Internet of things

International Journal of Distributed Sensor Networks, 2020
As the key technology for Internet of things, wireless sensor networks have received more attentions in recent years. Mobile localization is one of the significant topics in wireless sensor networks.
Nan Hu, Chuan Lin, Fangjun Luan, Chengdong Wu, Qi Song, Li Chen   +5 more
doaj   +1 more source

Measurements and Models of 915 MHz LoRa Radio Propagation in an Underground Gold Mine

Sensors, 2022
Underground mining increasingly relies on wireless communications for its operations. The move to automating many underground mining processes makes an understanding of the propagation characteristics of key wireless technologies underground a topic of ...
Philip Branch
doaj   +1 more source