Results 61 to 70 of about 61,350 (187)
Characterizing the Ambiguity Function of Constant-Envelope OFDM Waveforms [PDF]
arXiv, 2023 This paper investigates the radar Ambiguity Function (AF) properties of Constant Envelope Orthogonal Frequency Division Multiplexing (CE-OFDM) waveforms employing Phase-Shift Keying (PSK). The CE-OFDM is in fact a special case of the Multi-Tone Sinusoidal Frequency Modulated (MTSFM) waveform which allows for applying many of the same mathematical ...
arxiv
Signal processing algorithm for helicopter wideband noise non-coherent radar altimeter
Авіаційно-космічна техніка та технологія, 2022 The algorithm for a helicopter or an unmanned aerial vehicle flight altitude measuring based on the processing of broadband and ultra-wideband pulsed stochastic signals has been synthesized for the first time by the maximum likelihood method.
Валерій Костянтинович Волосюк +7 more
doaj +1 more source
Quarterly Journal of the Royal Meteorological Society, EarlyView.The variation of rainfall and its diurnal cycle with the Madden–Julian oscillation over coastal regions of NE Australia exhibit both large‐scale and local‐scale influences. The widespread increased rainfall is driven by large‐scale forcings, while the local enhanced rainfall is likely affected by mesoscale coastal processes. The variation of convective
Thi Lan Dao +3 more
wiley +1 more source
Index Modulation with Circularly-Shifted Chirps for Dual-Function Radar and Communications [PDF]
arXiv, 2021 In this study, we propose index modulation (IM) with circularly-shifted chirps (CSCs) (CSC-IM) for dual-function radar and communication (DFRC) systems. The proposed scheme encodes the information bits with the CSC indices and the phase-shift keying (PSK) symbols.
arxiv
Quarterly Journal of the Royal Meteorological Society, EarlyView.During July 2021 there were widespread reports of flooding across the equatorial Maritime Continent. This analysis reveals how interactions between a system of convectively coupled Kelvin waves (CCKWs) and diurnally phase‐locked westward‐propagating inertio‐gravity waves during an active Madden–Julian Oscillation (MJO) caused these extreme rainfall ...
Natasha V. Senior +7 more
wiley +1 more source
Constant envelope OFDM RadCom fusion system
EURASIP Journal on Wireless Communications and Networking, 2018 A joint radar and wireless communication (RadCom) fusion system is an important trend for future intelligent transportation, such as the Internet of Vehicles (IOV). However, traditional joint orthogonal frequency division multiplexing (OFDM)-based RadCom
Yixuan Huang +6 more
doaj +1 more source
Enhancing the Dynamic Range of OFDM Radars Using Non-Linear Operation and Symbol-Based Equalization
IEEE Journal of Microwaves, 2023 Due to the increased flexibility in terms of waveform generation, digitally-modulated radar systems are gaining increasing popularity among research and academia.
Rossen Michev +3 more
doaj +1 more source
Controls on ERS altimeter measurements over ice sheets: Footprint-scale topography, backscatter fluctuations, and the dependence of microwave penetration depth on satellite orientation [PDF]
, 2004 We consider the reliability of radar altimeter measurements of ice sheet elevation and snowpack properties in the presence of surface undulations. We demonstrate that over ice sheets the common practice of averaging echoes by aligning the first return ...
Arthern, RJ, Ridout, AL, Wingham, DJ
core +1 more source
Quarterly Journal of the Royal Meteorological Society, EarlyView.This study presents a novel, consistent coupling of two‐moment microphysics (i.e., ice mass mixing ratio and number) with bulk ice optical properties, providing improved accuracy in radiative transfer simulations. The parametrisations, based on the mass‐equivalent spherical radius, avoid uncertainties associated with the effective radius by directly ...
Anthony J. Baran +4 more
wiley +1 more source
Immunosenescence Profile Is Associated With Increased Susceptibility to Severe COVID‐19
Aging Cell, EarlyView.(A) A previous immunosenescence profile in individuals infected with SARS‐CoV2 creates a permissive environment for progression to severe COVID‐19: higher inflammaging, accumulation of exhausted/senescent T cells, an oligoclonal B‐cell repertoire, and accelerated epigenetic age.
Lucas Haniel A. Ventura +40 more
wiley +1 more source