Results 101 to 110 of about 27,516 (271)
Motion Parameter Estimation of Doppler-Ambiguous Moving Targets in SAR-GMTI [PDF]
, 2007 In an along-track interferometric SAR system, the discrete sampling of moving target signals can give rise to two types of ambiguity: Doppler ambiguity, and interferometric angle ambiguity.
Sikaneta, Ishuwa, Gabele, Martina
core
Fault and magmatic interaction within Iceland's western rift over the last 9kyr [PDF]
, 2003 We present high-resolution 'Chirp' sub-bottom profiler data from Thingvallavatn, a lake in Iceland's western rift zone. These data are combined with stratigraphic constraints from sediment cores to show that movement on normal faults since 9 ka are ...
Thors, K. +10 more
core +1 more source
Laser &Photonics Reviews, EarlyView.A novel optical platform integrates a Sagnac‐based interferometer with a high‐brightness multiple‐plate continuum source to advance two‐dimensional electronic spectroscopy. The robust system delivers octave‐spanning, 3.7‐femtosecond pulses and achieves intrinsic attosecond‐level phase stability without active feedback.
Wei‐Chung Feng +5 more
wiley +1 more source
New MSFCSK-Chirp modulation scheme to improve transmission efficiency
Tongxin xuebaoChirp modulation, due to its unique linear frequency modulation method, has become a key technology adopted by the physical layer of low-power wide-area network (LPWAN).
Xiu Menglei, Dou Gaoqi, Liu Chunkai
doaj
Geometrical properties of systems with spiral trajectories in R^3
Electronic Journal of Differential Equations, 2015 We study a class of second-order nonautonomous differential equations, and the corresponding planar and spatial systems, from the geometrical point of view.
Luka Korkut +2 more
doaj
Generation of an isolated sub-40-as pulse using two-color laser pulses: Combined chirp effects
, 2011 Generation of an isolated sub-40-as pulse using two-color laser pulses: Combined chirp effectsIn this paper, we theoretically discuss the combined chirp effects on the isolated attosecond generation when a model Ar is exposed to an intense 5-fs, 800-nm ...
楚天舒, Chu, Tianshu, Feng, Liqiang
core +1 more source
Simultaneous ToF/FMCW LiDAR Using a Dual‐Mode Light Source in a Single Architecture
Laser &Photonics Reviews, EarlyView.A simultaneous ToF/FMCW LiDAR architecture is demonstrated using a dual‐mode light source that alternately generates optical pulses and frequency‐chirped light within a single acquisition. By combining time‐domain ToF and coherent FMCW ranging, the system achieves high‐resolution ranging and velocity sensing while extending the measurable range beyond ...
Gyeongmin Kweon +5 more
wiley +1 more source
Parameter Estimation of Chirp for Underwater Acoustic Channel
MATEC Web of Conferences, 2018 To overcome the performance degradation of conventional Chirp parameters estimation methods in underwater acoustic multipath channels, a novel parameters estimation method based on Fractional Fourier transform (FRFT) and Fourier transform (FFT) was ...
Junhui FAN, Hua PENG, Chi WEI
doaj +1 more source
Multispectral Mid‐Infrared Imaging With Incoherent Light via Adiabatic Upconversion
Laser &Photonics Reviews, EarlyView.We demonstrate room‐temperature broadband MIR imaging based on adiabatic frequency upconversion, driven by a Q‐switched pump laser and incoherent illumination. The small‐foot‐print system upconverts the spectral range to the visible domain, without scanning, thermal control and with spatial resolution below 20μm$20\mathrm{\mu}\mathrm{m}$.
Daniel Beitner +4 more
wiley +1 more source
Digital surveillance of animals and nature recovery
People and Nature, EarlyView.Abstract Digital surveillance technologies (DSTs) are widely applied in nature recovery for their potential to generate novel data on species and ecosystems through digital tracking, automation (e.g. from hazardous locations) and from newly recruited citizen scientists.
William M. Adams
wiley +1 more source