Results 71 to 80 of about 178,095 (274)

Real-Time Signal Generator for Noise Radar

IEEE Aerospace and Electronic Systems Magazine, 2020
We present a real-time intermediate frequency noise radar signal generator that provides pseudo-random signals with uniform, normal, exponential, and Rayleigh probability distributions. In addition, normally distributed samples with uniform power spectral distribution with arbitrary bandwidths can be generated. The noise signal generator is implemented
Ispir, Mehmet, Yildirim, Alper
openaire   +2 more sources

Dilution Effect for High‐Performance Multiple‐Component Near‐Infrared Organic Photodetectors

Advanced Science, EarlyView.
The dilution effect in multi‐component organic photodetector effectively suppresses non‐radiative decay and minimizes dark current, while energy‐level‐offset‐governed electron transfer between acceptors maintains efficient charge transport. This synergistic mechanism collectively enables remarkable device performance, including high detectivity and ...
Zhuang Li, Xunchang Wang, Xiaosong Qiu, Xinpeng Yang, Linming Bi, Jin Chen, Qian Wang, Yurong He, Jingyi Xiong, Renqiang Yang   +9 more
wiley   +1 more source

Interfacial Engineering in Rare‐Earth Oxide/ZnO Heterojunctions for High‐Performance Trimethylamine Sensing and Fish Freshness Monitoring

Advanced Science, EarlyView.
This study realizes superior gas sensing performance via Yb2O3/ZnO heterojunction design, achieving highly sensitive/selective trimethylamine detection at room temperature while elucidating the intrinsic sensing mechanism. This innovation is applied to reliable real‐time fish freshness monitoring, paving a feasible way for translating advanced material
Junxi Cheng, Chang Liu, Miaomiao Liu, Qihua Sun, Jun Sun, Zhaofeng Wu   +5 more
wiley   +1 more source

Noise Radar Waveform Design Using Evolutionary Algorithms and Negentropy Constraint

Remote Sensing
In recent years, several advantages of noise radars have positioned this technology as a promising alternative to conventional radar technology. Immunity to jamming, low mutual interference, and low probability of interception are good examples of these ...
Afonso L. Sénica, Paulo A. C. Marques, Mário A. T. Figueiredo   +2 more
doaj   +1 more source

Noise Suppression in 94 GHz Radar-Detected Speech Based on Perceptual Wavelet Packet

Entropy, 2016
A millimeter wave (MMW) radar sensor is employed in our laboratory to detect human speech because it provides a new non-contact speech acquisition method that is suitable for various applications. However, the speech detected by the radar sensor is often
Fuming Chen, Chuantao Li, Qiang An, Fulai Liang, Fugui Qi, Sheng Li, Jianqi Wang   +6 more
doaj   +1 more source

1D Convolutional Neural Networks Versus Automatic Classifiers for Known LPI Radar Signals Under White Gaussian Noise

IEEE Access, 2020
In this study we analyze the signal classification performances of various classifiers for deterministic signals under the additive White Gaussian Noise (WGN) in a wide range of signal to noise ratio (SNR) levels (-40dB to +20dB).
Alper Yildirim, Serkan Kiranyaz
doaj   +1 more source

A Si‐MoSe2 Heterostructured Anode with Enhanced Thermal Transport and Electrochemical Performance for Liquid and All‐Solid‐State Lithium‐Ion Batteries

Advanced Science, EarlyView.
Chemically bonded Si@MoSe2@C heterointerfaces with robust Si─Se─Mo bonds enable high‐performance Si anodes. Lattice‐matched MoSe2 on porous Si with carbon‐protective coating delivers 1054 mAh g−1 after 100 cycles and 99.5% Coulombic efficiency over 400 cycles.
Yajun Zhu, Jiaqi Gu, Guangwu Zhang, Tianli Han, Yang Lu, Zhongbing Li, Hang Su, Fei Wang, Haojun Xu, Wentuan Bi, Qiye Zheng, Jinyun Liu   +11 more
wiley   +1 more source

A pseudo-matched filter for chaos

, 2012
A matched filter maximizes the signal-to-noise ratio of a signal. In the recent work of Corron et al. [Chaos 20, 023123 (2010)], a matched filter is derived for the chaotic waveforms produced by a piecewise-linear system.
Cohen, Seth D., Gauthier, Daniel J.
core   +1 more source

Characterizing Phase Noise in Radar

, 2023
<p>There is some confusion in the radar community on the handling of phase noise in radar because current definitions give rise to divergent integrals. </p> <p>It is shown that the spectrum of a phase noise modulated signal rather than the spectrum of the phase noise modulating function is the applicable function for coherent radar ...
PW Van Der Walt, Werner Steyn
openaire   +1 more source

Broadband Achromatic Programmable Electromagnetic Camouflage via Fluidic‐Accessible Metasurface

Advanced Science, EarlyView.
A fluidic access metasurface enables dynamic, broadband electromagnetic illusions. By physically reconstructing conductive patterns with liquid metal, the metasurface achieves real‐time, pixel‐level control over phase dispersion. This allows for the programmable generation of arbitrary strong scattering point arrays, effectively deceiving high ...
Shipeng Liu, Jiahao Zhang, Jiale Wang, Zeyao Chen, Zhaotong Yu, Jinhong Luo, Jiabao Luo, Rujia Cao, Shuxi Gong, Qingxin Guo, Ping Li, Rujiang Li, Ke Chen, Yongtao Jia, Ying Liu   +14 more
wiley   +1 more source