Results 81 to 90 of about 2,611 (211)

Low‐Complexity DOA Estimation: Combining VSSLMS With FFT Spectrum Estimation

Electronics Letters, Volume 62, Issue 1, January/December 2026.
This letter presents a novel, low‐complexity framework for DOA estimation. The proposed method achieves a significant reduction in computational complexity—from O(ML) to O(M log L)—compared to conventional SSE methods. Crucially, as illustrated in the accompanying figure, the method maintains high estimation accuracy, outperforming standard SSE‐based ...
Lei Sun, Ding Ding, Songbai Zhang, Xiao Dai, Chaoyang Xu   +4 more
wiley   +1 more source

Long-term continuous observations of the horizontal inhomogeneity in lower-atmospheric water vapor concentration using A-SKY/MAX-DOAS

Progress in Earth and Planetary Science
We conducted long-term (2017–2022) continuous observations of water vapor concentration in the lower atmosphere (0–1 km) over Tsukuba and Chiba, Japan, using the multi-axis differential optical absorption spectroscopy (MAX-DOAS) technique within the ...
Shunya Mizobuchi, Hitoshi Irie, Shingo Shimizu   +2 more
doaj   +1 more source

Analysis of satellite-derived Arctic tropospheric BrO columns in conjunction with aircraft measurements during ARCTAS and ARCPAC [PDF]

, 2012
We derive tropospheric column BrO during the ARCTAS and ARCPAC field campaigns in spring 2008 using retrievals of total column BrO from the satellite UV nadir sensors OMI and GOME-2 using a radiative transfer model and stratospheric column BrO from a ...
Canty, T, Chance, K, Choi, S, Curry, J, da Silva, Arlindo, Dibb, Jack E., Diskin, Glenn, Huey, L Gregory, Joiner, J, Kinnison, D, Kurosu, T P, Levelt, P F, Liao, J, Neuman, J A, Nowak, J, Richter, A, Ryerson, Thomas B, Salawitch, R J, Tilmes, S, Wang, Yuhang, Weinheimer, Andrew, Zeng, T   +21 more
core   +1 more source

Monitoring shipping emissions in the German Bight using MAX-DOAS measurements [PDF]

Atmospheric Chemistry and Physics, 2017
Abstract. A 3-year time series of ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements of NO2 and SO2 on the island Neuwerk has been analyzed for contributions from shipping emissions. The island is located in the German Bight, close to the main shipping lane (at a distance of 6–7 km) into the river Elbe towards ...
A. Seyler, F. Wittrock, L. Kattner, L. Kattner, B. Mathieu-Üffing, B. Mathieu-Üffing, E. Peters, A. Richter, S. Schmolke, J. P. Burrows   +9 more
openaire   +3 more sources

Multispectrally Constrained Waveform Design for MIMO Radar Direction Finding

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
This paper focuses on the design of transmit waveforms for multiple‐input‐multiple‐output (MIMO) radar systems in a spectrally crowded environment. The purpose is to improve the angle estimation performance of MIMO radar by minimising the asymptotic estimation bound of multiple signal classification (MUSIC) algorithm.
Da Li, Xingyu Wang, Xiangyu Wu, Cheng Zhou, Yuxue Sun   +4 more
wiley   +1 more source

Full-azimuthal imaging-DOAS observations of NO₂ and O₄ during CINDI-2 [PDF]

Atmospheric Measurement Techniques, 2019
A novel imaging-DOAS (differential optical absorption spectroscopy) instrument IMPACT (Imaging MaPper for AtmospheriC observaTions) is presented combining full-azimuthal pointing (360∘) with a large vertical coverage (∼41∘).
E. Peters, E. Peters, M. Ostendorf, T. Bösch, A. Seyler, A. Schönhardt, S. F. Schreier, J. S. Henzing, F. Wittrock, A. Richter, M. Vrekoussis, M. Vrekoussis, M. Vrekoussis, J. P. Burrows   +13 more
doaj   +1 more source

Loop Matching Pursuit Multistation TDOA Estimation Method Based on Noncircular Signal

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
The existing TDOA estimation methods based on orthogonal matching pursuit only consider the scenario of circular signal and are prone to the degradation of estimation performance due to atom misselection under small samples and low signal‐to‐noise ratio.
Zeyu Wang, Ding Wang, Jiexin Yin, Nae Zheng   +3 more
wiley   +1 more source

Research on Phase Characteristics of FDA‐AWACS and Direction Finding Mechanism Based on Anti‐Phase Method

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
This paper investigates the phase‐frequency response characteristics of frequency diverse array (FDA) radar on airborne warning and control system (AWACS) platforms and its deception mechanism against interferometric direction finders, aiming to address the vulnerability of AWACS to precise interception by passive direction‐finding systems due to poor ...
Jing Zhang, Bo Wang, Haowei Zhang
wiley   +1 more source

Etna International Training School of Geochemistry. Science meets Practice [PDF]

, 2019
Also this year, the “Etna International Training School of Geochemistry. Science meets practice” took place at Mt. Etna, now in its fourth edition.
Bitetto Marcello, Bobrowski Nicole, Brugnone FIlippo, Cabassi Jacopo, Calabrese Sergio, Cantarero Massimo, Capecchiacci Francesco, Consoli Salvatore, Daskalopoulou Kyriaki, Franco Italiano, Fuchs Christopher, Giammanco Salvatore, Giuffrida GIovanni, Ionescu Artur, Kuhn Jonas, Li Vigni Lorenza, Pecoraino Guendalina, Privitera Eugenio, Randazzo Luciana, Tamburello Giancarlo, Tassi Francesco, Venturi Stefania   +21 more
core   +1 more source

Latitudinal distribution of reactive iodine in the Eastern Pacific and its link to open ocean sources [PDF]

, 2012
Ship-based Multi-Axis Differential Optical Absorption Spectroscopy measurements of iodine monoxide (IO) and atmospheric and seawater Gas Chromatography-Mass Spectrometer observations of methyl iodide (CH3I) were made in the Eastern Pacific marine ...
Gomez Marti­n, JC, Hay, TD, Hu, L, Liu, Y, Mahajan, AS, Ordonez, C, Plane, JMC, Prados-Roman, C, Royer, SJ, Saiz-Lopez, A., Yvon-Lewis, S   +10 more
core   +4 more sources