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清华大学 [9]
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期刊论文 [19]
会议论文 [8]
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Detection of two bright radio bursts from magnetar SGR 1935 + 2154
期刊论文
Nature Astronomy, 2021, 卷号: 5, 页码: 414
作者:
Kirsten, F.
;
Snelders, M. P.
;
Jenkins, M.
;
Nimmo, K.
;
van den Eijnden, J.
收藏
  |  
浏览/下载:44/0
  |  
提交时间:2021/11/18
Astrophysics - High Energy Astrophysical Phenomena
Abstract: Fast radio bursts are millisecond-duration, bright radio signals (fluence 0.1-100 Jy ms) emitted from extragalactic sources of unknown physical origin. The recent CHIME/FRB and STARE2 detection of an extremely bright (fluence ~MJy ms) radio burst from the Galactic magnetar SGR 1935+2154 supports the hypothesis that (at least some) fast radio bursts are emitted by magnetars at cosmological distances. In follow-up observations totalling 522.7 h on source, we detect two bright radio bursts with fluences of 112 ± 22 Jy ms and 24 ± 5 Jy ms, respectively. Both bursts appear to be affected by interstellar scattering and we measure significant linear and circular polarization for the fainter burst. The bursts are separated in time by ~1.4 s, suggesting a non-Poissonian, clustered emission processsimilar to those seen in some repeating fast radio bursts. Together with the burst reported by CHIME/FRB and STARE2, as well as a much fainter burst seen by FAST (fluence 60 mJy ms), our observations demonstrate that SGR 1935+2154 can produce bursts with apparent energies spanning roughly seven orders of magnitude, and that the burst rate is comparable across this range. This raises the question of whether these four bursts arise from similar physical processes, and whether the fast radio burst population distribution extends to very low energies (~10
30
erg, isotropic equivalent).
Photonic RF and Microwave Integrator Based on a Transversal Filter With Soliton Crystal Microcombs
期刊论文
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 2020, 卷号: 67, 期号: 12, 页码: 3582-3586
作者:
Xu, Xingyuan
;
Tan, Mengxi
;
Wu, Jiayang
;
Boes, Andreas
;
Corcoran, Bill
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  |  
浏览/下载:67/0
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提交时间:2021/01/07
Radio frequency
Photonics
RF signals
Optical fibers
Solitons
Optical resonators
Bandwidth
Integrator
Kerr micro-comb
RF signal processing
Self-assisted first-fix method for GPS receiver with autonomous short-term ephemeris prediction
期刊论文
2019, 卷号: 13, 页码: 1974-1980
作者:
Yang, Ruihong
;
Song, Zhongguo
;
Xi, Xiaoli
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  |  
浏览/下载:13/0
  |  
提交时间:2019/12/20
artificial satellites
Global Positioning System
radio receivers
celestial mechanics
GPS receiver
short-term ephemeris prediction
key parameters
global position system receiver
autonomous satellite orbit prediction algorithm
usable ephemeris
broadcast ephemeris
experimental results
ephemeris prediction algorithm
cold start mode
presented algorithm
empirical SRP model
simulation results
GPS PRN 5
constant parameters
5 days
position error
simulated satellite signals
p
GNU radio based bandpass sampling radio processor
会议论文
作者:
Wang, Hongmei
;
Wang, Faguang
;
Li, Shiyin
;
Lee, Sanghyuk
;
Yao, Chong
收藏
  |  
浏览/下载:1/0
  |  
提交时间:2019/11/19
16-QAM signals
Band-pass sampling
GNU radio
Multi-band receivers
Platform design
Receiver architecture
Signal processing technique
Software Defined Radio (SDR)
Cooperative spectrum sharing in cognitive radio networks with energy accumulation: design and analysis
期刊论文
IET Communications, 2018, 卷号: 12, 期号: 15, 页码: 1788-1796
作者:
Tang, Kun
;
Shi, Ronghua
;
Xi, Jingchun
;
Shi, Heyuan
;
Lei, Wentai*
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  |  
浏览/下载:14/0
  |  
提交时间:2019/12/03
energy harvesting
cognitive radio
Markov processes
Monte Carlo methods
cooperative communication
probability
interference suppression
radio spectrum management
telecommunication power management
multi-access systems
cognitive radio networks
energy accumulation
received primary signals
primary transmission
spectrum access
superposition scheme
RF energy
interference cancellation schemes
outage probability
secondary system
primary system
cooperative spectrum sharing
joint decoding
energy-constrained secondary transmitter
radio frequency energy
discrete Markov chain
optimal power allocation factor
Monte-Carlo simulation
A Vehicular Positioning Enhancement with Connected Vehicle Assistance Using Extended Kalman Filtering
期刊论文
Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST, 2018, 卷号: 211, 页码: 597-608
作者:
Tian, D.
;
Liu, W.
;
Duan, X.
;
Rong, H.
;
Guo, P.
收藏
  |  
浏览/下载:10/0
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提交时间:2019/12/30
5G mobile communication systems
Data fusion
Dedicated short range communications
Extended Kalman filters
Global positioning system
Vehicle to vehicle communications
Vehicles
Wireless networks
Doppler frequency shift
Extended Kalman filtering
Imm-ekf
Interacting multiple model filter (IMM)
Observation model
Positioning enhancements
Radio signals
Target vehicles
Kalman filters
Power waveforms analysis of GNSS-R delay signals from beidou GEO satellite
会议论文
Proceedings - 2017 10th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics, CISP-BMEI 2017
作者:
Islam, M.S.
;
Yang, D.-K.
;
Sikder, M.A.A.
收藏
  |  
浏览/下载:4/0
  |  
提交时间:2019/12/30
Biomedical engineering
Global positioning system
Image processing
Radio communication
Radio navigation
Remote sensing
Salinity measurement
Satellites
Surface waters
Wind
Coherent integration
GNSS-R
Integration time
Power waveforms
Reflected signal
Scattered signals
Scattering model
Three parameters
Orbits
An Efficient Narrowband Interference Suppression Approach in Ultra-Wideband Receiver
期刊论文
IEEE SENSORS JOURNAL, 2017, 卷号: 17, 期号: 9, 页码: 2741-2748
作者:
Xiong, Hailiang
收藏
  |  
浏览/下载:9/0
  |  
提交时间:2019/12/12
Interference suppression
signal to noise ratio
narrowband
interference
ultra-wideband
adaptive signal processing
digital
receiver
impulse radio
pulse position modulation
code-division
multiple access
real signals
SpaceHub: A smart relay system for smart home
会议论文
作者:
Meng, Meng
;
You, Lizhao
;
Tan, Kun
;
Zhang, Jiansong
;
Wang, Wenjie
收藏
  |  
浏览/下载:3/0
  |  
提交时间:2019/12/02
Angle of arrival
Interfering signals
Multi-antenna relay
Relative location
Relay
Software radio platform
Spatial filters
Wireless communications
Coherent detection of multiband phase modulated radio-over-fiber signals using bandpass sampling
会议论文
Shanghai, China, November 11, 2014 - November 14, 2014
作者:
Cao, Minghua
;
Li, Jianqiang
;
Xu, Kun
;
Dai, Yitang
;
Yin, Feifei
收藏
  |  
浏览/下载:13/0
  |  
提交时间:2020/11/15
Phase modulation
Photonics
Radio links
Signal sampling
Band-pass sampling
Coherent detection
Long fiber
Multiband
Phase modulated
Radio over fiber link
Sub-carrier multiplexed
Subcarrier signals
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