Results 51 to 60 of about 7,688 (234)

Estimation of Bistatic Radar Detection Performance Under Discrete Clutter Conditions Using Stochastic Geometry [PDF]

arXiv, 2022
We propose a metric called the bistatic radar detection coverage probability to evaluate the detection performance of a bistatic radar under discrete clutter conditions. Such conditions are commonly encountered in indoor and outdoor environments where passive radars receivers are deployed with opportunistic illuminators.
arxiv  

Diagnostic Modalities in Sleep Disordered Breathing: Current and Emerging Technology and Its Potential to Transform Diagnostics

Respirology, Volume 30, Issue 4, Page 286-302, April 2025.
ABSTRACT Underpinned by rigorous clinical trial data, the use of existing home sleep apnoea testing is now commonly employed for sleep disordered breathing diagnostics in most clinical sleep centres globally. This has been a welcome addition for the field given the considerable burden of disease, cost, and access limitations with in‐laboratory ...
Lucía Pinilla, Ching Li Chai‐Coetzer, Danny J. Eckert   +2 more
wiley   +1 more source

Sensitivity of Single-Pulse Radar Detection to Radar State Uncertainty [PDF]

arXiv, 2022
Mission planners for aircraft operating under threat of detection from ground-based radar systems are often concerned with the probability of detection. Current approaches to path planning in such environments consider the radar state (i.e. radar position and parameters) to be deterministic and known.
arxiv  

Cosmic Rays and the Askaryan Effect Reveal Subsurface Structure and Buried Ice on the Moon

Geophysical Research Letters, Volume 52, Issue 6, 28 March 2025.
Abstract We present the first full‐wavelength numerical simulations of the electric field generated by cosmic ray impacts into the Moon. Billions of cosmic rays fall onto the Moon every year. Ultra‐high energy cosmic ray impacts produce secondary particle cascades within the regolith and subsequent coherent, wide‐bandwidth, linearly‐polarized radio ...
E. S. Costello, R. R. Ghent, A. Romero‐Wolf, P. W. Gorham, P. G. Lucey, C. J. Tai Udovicic, P. Linton, A. Ludwig, K. McBride, C. Miki, E. Oberla, J. Rolla, A. Jung   +12 more
wiley   +1 more source

Radar detection and speed estimation of high‐speed targets using phase‐modulated waveforms

Electronics Letters, 2023
Specifying parameters of high‐speed targets as range and velocity in radar systems operating with phase‐modulated signals is a problematic process because of the serious effect of high Doppler frequency on these types of waveforms.
Alaa G. Zahra, Wael Mehany, Fathy M. Ahmed, Ahmed Youssef   +3 more
doaj   +1 more source

Generation of Quasi‐Periodic Dayside Medium Scale Traveling Ionospheric Disturbances (MSTIDs) by Intermittent Lobe Reconnection

Geophysical Research Letters, Volume 52, Issue 6, 28 March 2025.
Abstract The medium‐scale traveling ionospheric disturbances (MSTIDs) can be excited by many sources. Among those magnetic reconnection has been proposed as a potential driver for dayside MSTIDs, but direct evidence has been limited. Using ground‐based radar data from the Super Dual Auroral Radar Network on 14 December 2012, we observed quasi‐periodic ...
Yating Xiong, Huixin Liu, Run Shi, Zanyang Xing, Sheng Lu, Qiang Zhang, Zhiwei Wang, Desheng Han   +7 more
wiley   +1 more source

Drone Detection with Chirp‐Pulse Radar Based on Target Fluctuation Models

ETRI Journal, 2018
This paper presents a pulse radar system to detect drones based on a target fluctuation model, specifically the Swerling target model. Because drones are small atypical objects and are mainly composed of non‐conducting materials, their radar cross ...
Byung‐Kwan Kim, Junhyeong Park, Seong‐Jin Park, Tae‐Wan Kim, Dae‐Hwan Jung, Do‐Hoon Kim, Taihyung Kim, Seong‐Ook Park   +7 more
doaj   +1 more source

Supercooled Liquid Water at the Top of a Snow‐Producing Nimbostratus Cloud and Its Association With Gravity Wave Breaking and Turbulence: An IMPACTS Case Study

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 6, 28 March 2025.
Abstract Supercooled liquid water (SLW) at the top of a snow‐producing nimbostratus cloud was thoroughly characterized with remote‐sensing and in situ measurements during the NASA Investigation of Microphysics and Precipitation for Atlantic Coast‐Threatening Snowstorms (IMPACTS) field campaign on 30 January 2022.
Mei Han, Scott A. Braun, Timothy Lang, Matthew L. Walker Mclinden, Gerald M. Heymsfield, Lihua Li, Kenneth L. Thornhill   +6 more
wiley   +1 more source

Mechanism of Turbulence Structure Evolution in the Nocturnal Boundary Layer During the Interaction of Low‐Level Jet and Internal Gravity Waves: Based on Full Boundary Layer Turbulence Observations

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 6, 28 March 2025.
Abstract In a stable boundary layer (SBL), turbulence is generally weak and exhibits significant intermittent characteristics. Interactions among motions of different scales complicate its structural evolution, making prediction challenging. This study focuses on two typical processes in the SBL: low‐level jet (LLJ) and internal gravity waves (IGWs ...
Jie Ding, Yan Ren, Hongsheng Zhang, Heying Chang, Zeyong Hu, Jiening Liang, Kaijun Zhang, Shujin Wang, Xianjie Cao, Pengfei Tian, Lei Zhang   +10 more
wiley   +1 more source

Short-Range Noncontact Sensors for Healthcare and Other Emerging Applications: A Review

Sensors, 2016
Short-range noncontact sensors are capable of remotely detecting the precise movements of the subjects or wirelessly estimating the distance from the sensor to the subject.
Changzhan Gu
doaj   +1 more source