Results 61 to 70 of about 7,688 (234)

The Boundary Layer Wind Characteristics of Typhoon Muifa (2022) at Lujiazui, Shanghai Observed by A Ground‐Based Doppler Wind Lidar

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 6, 28 March 2025.
Abstract Understanding wind characteristics of the tropical cyclone boundary layer (TCBL) over land is crucial for improving typhoon forecasts and designing wind‐resistant structures. This study employs a ground‐based Doppler wind radar (DWL) in Lujiazui, Shanghai, to examine the evolution of TCBL wind and turbulence during Typhoon Muifa (2022 ...
Ziyao Sun, Shanghong Wang, Jie Tang, Hui Yu   +3 more
wiley   +1 more source

Passive Radar at the Roadside Unit to Configure Millimeter Wave Vehicle-to-Infrastructure Links [PDF]

arXiv, 2019
Millimeter wave (mmWave) vehicular channels are highly dynamic, and the communication link needs to be reconfigured frequently. In this work, we propose to use a passive radar receiver at the roadside unit to reduce the training overhead of establishing an mmWave communication link.
arxiv  

Sparse Detection Algorithms Based on Two-Dimensional Compressive Sensing for Sub-Nyquist Pulse Doppler Radar Systems

IEEE Access, 2019
Sub-Nyquist pulse Doppler radar system has received wide attention recently because it can make the sampling rate lower than the Nyquist sampling rate. However, there are still two problems that must be addressed for sub-Nyquist pulse Doppler radar.
Beiyi Liu, Yu Zhao, Xiaomei Zhu, Shinya Matsushita, Li Xu   +4 more
doaj   +1 more source

Intercomparison of Machine Learning Models to Determine the Planetary Boundary Layer Height Over Central Amazonia

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 6, 28 March 2025.
Abstract The planetary boundary layer height (zi) is a key parameter in meteorology and climatology, influencing weather prediction, cloud formation, and the vertical transport of scalars and energy near Earth's surface. This study compares multiple machine learning (ML) models that predict zi from surface measurements at two sites in Central Amazonia ...
Adam Stapleton, Cléo Quaresma Dias‐Junior, Celso Von Randow, Flávio Augusto Farias D'Oliveira, Christopher Pöhlker, Alessandro C. de Araújo, Mark Roantree, Elke Eichelmann   +7 more
wiley   +1 more source

Range and Velocity Estimation of Moving Targets Using Multiple Stepped-frequency Pulse Trains

Sensors, 2008
Range and velocity estimation of moving targets using conventional steppedfrequencypulse radar may suffer from the range-Doppler coupling and the phasewrapping.
Ying-Ning Peng, Xiang-Gen Xia, Huadong Meng, Gang Li   +3 more
doaj  

Micro-Doppler Ambiguity Resolution Based on Short-Time Compressed Sensing

Journal of Electrical and Computer Engineering, 2015
When using a long range radar (LRR) to track a target with micromotion, the micro-Doppler embodied in the radar echoes may suffer from ambiguity problem.
Jing-bo Zhuang, Zhen-miao Deng, Yi-shan Ye, Yi-xiong Zhang, Yan-yong Chen   +4 more
doaj   +1 more source

High-precision measurement of satellite velocity using the EISCAT radar [PDF]

Annales Geophysicae, 2012
This paper presents a method of measuring the velocity of a hard target using radar pulses reflected from the target flying through the radar beam. The method has two stages.
T. Nygrén, J. Markkanen, A. Aikio, M. Voiculescu   +3 more
doaj   +1 more source

Long‐Term Variability and Tendencies of the Semidiurnal Tide in Mesosphere and Lower Thermosphere From Meteor Radar Observations Over Esrange (67.9°N, 21.1°E)

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 6, 28 March 2025.
Abstract Long‐term variability and tendencies in monthly mean semidiurnal tide (12‐hr) in zonal (U12) and meridional (V12) winds are investigated in northern polar mesosphere and lower thermosphere (MLT; ∼80–100 km) using meteor radar observations during 1999–2022 over Esrange (67.9°N, 21.1°E). The climatological mean of U12 and V12 amplitudes peak (up
K. Ramesh, Nicholas J. Mitchell, Neil P. Hindley, Tracy Moffat‐Griffin   +3 more
wiley   +1 more source

Cognitive Dynamic Systems: A Technical Review of Cognitive Radar [PDF]

arXiv, 2016
We start with the history of cognitive radar, where origins of the PAC, Fuster research on cognition and principals of cognition are provided. Fuster describes five cognitive functions: perception, memory, attention, language, and intelligence. We describe the Perception-Action Cyclec as it applies to cognitive radar, and then discuss long-term memory,
arxiv  

Dynamic Doppler Characteristics of Maritime Airborne Corner Reflector

Journal of Marine Science and Engineering
The maritime airborne corner reflector (ACR) is a radar reflector that can measure wind speed in an unknown sea area in real time over a long distance. To improve our understanding of how the ACR works, we investigated the Doppler characteristics of the ...
Lingang Wu, Shengliang Hu, Chengxu Feng, Yasong Luo, Zhong Liu, Li Lin   +5 more
doaj   +1 more source