搜索结果: 1-15 共查到“radio signals”相关记录15条 . 查询时间(0.108 秒)
Disturbances in LF radio-signals as seismic precursors
radio signals seismicity precursors
2015/9/28
Low Frequency (LF) radio signals lie in the band 30-300 kHz. Monitoring equipment able to measure the electric strength of such signals, at field sites with very low noise levels, were designed and as...
An overview on preseismic anomalies in LF radio signals revealed in Italy by wavelet analysis
LF radio-waves wavelet seismicity precursors
2015/9/1
Since 1996, the electric field strength of the two broadcasting stations MCO (f=216 kHz, southeast France) and
CZE (f=270 kHz, Czech Republic) has been sampled every ten minutes by a receiver (AS) lo...
Wavelet analysis of the LF radio signals collected by the European VLF/LF network from July 2009 to April 2011
Radio Network Wavelet precursors
2015/8/24
In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-300 kHz) bands was developed by an Italian factory. The receiver can monitor 10 frequencies distributed in these...
Anomalies Observed in VLF and LF Radio Signals on the Occasion of the Western Turkey Earthquake (Mw = 5.7) on May 19, 2011
Earthquake Precursors European Radio Network Radio Signal Analysis
2013/3/11
Since 2009 a network of VLF (20 - 60 kHz) and LF (150 - 300 kHz) radio receivers is operating in Europe in order to study the disturbances produced by the earthquakes on the propagation of these signa...
We experimentally demonstrate a simultaneous generation of baseband (BB) and RF signals, using only one single-electrode Mach–Zehnder modulator (SD-MZM) based
on double-sideband with optical carrier ...
Complete Mitigation of Brillouin Scattering Effects in Reflective Passive Optical Networks using Triple-Format OFDM Radio Signals
Brillouin Scattering Effect Passive Optical Network Triple-Format OFDM Radio Signals
2015/5/18
Brillouin scattering is identified as a severe limitation in narrow line-width,bi-directional reflective systems. A spectrum management mitigation technique for triple-format OFDM signals is demonstra...
Specialty Fiber Evaluation for In-building Distribution of Multiple-Format OFDM Radio Signals
OFDM Radio Signal building Distribution Specialty Fiber
2015/5/15
Optical fiber options for deployment within the home environment were investigated for distribution of triple-play services. Corning ClearCurve® ZBL single-mode bend-insensitive optical fiber per...
VLF-LF radio signals collected at Bari (South Italy): a preliminary analysis on signal anomalies associated with earthquakes
VLF-LF radio signals a preliminary analysis signal anomalies earthquakes
2009/12/14
At the beginning of 2002 an OmniPAL receiver was put into operation at the Department of Physics of Bari University (Southern Italy). The electric field strength of five VLF-LF signals transmitted fro...
Investigation of over-horizon VHF radio signals associated with earthquakes
over-horizon VHF radio signals earthquakes
2009/12/9
This paper presents the preliminary results on the possible reception of over-horizon VHF radio signals from a FM (frequency modulation) transmitter during abnormal situations (probably in close assoc...
Possible earthquake precursors revealed by LF radio signals
Possible earthquake precursors LF radio signals
2009/12/9
In this case, it is possible that the pre-seismic processes could have produced irregularities in the troposphere, such as ducts, reflecting layers and scattering zones, so that some local troposphere...
Anomalies in VLF radio signals prior the Abruzzo earthquake (M=6.3) on 6 April 2009
Anomalies VLF radio signals Abruzzo earthquake (M=6.3)
2009/12/8
The VLF/LF radio signals method for studying preseimic activity is applied to the Abruzzo earthquake (M=6.3, 6 April 2009). The data collected by three receivers located in Moscow (Russia), Graz (Aust...
Sensing Ultra-Low-Power Radio Signals by Photonic Analog-to-Digital Conversion
Sensing Radio Signals Photonic Analog-to-Digital Conversion
2015/7/20
A time-stretched photonic analog-to-digital converter with optical amplification is proposed to sense ultra-low power signals for cognitive radio applications. Experimental results show that -65 dBm R...
All-optical Routing Architecture of Radio Signals using Label Processing Technique for In-building Optical Networks
All-optical Routing Architecture Radio Signals Label Processing Technique In-building Optical Networks
2015/7/31
We demonstrate an all-optical scheme for routing radio signals through optical fibres employing label-processing technique. 10-MS/s 64-QAM signal carried on 5-GHz RF carrier was successfully routed wi...
Decrease in the electric intensity of VLF/LF radio signals and possible connections
Decrease electric intensity VLF/LF radio signals possible connections
2009/12/30
In February 2002, a receiver was put into operation at the Department of Physics of Bari University (Southern Italy) to record VLF-LF radio signals. The intensity and the phase of the signals transmit...
Global diagnostics of the ionospheric perturbations related to the seismic activity using the VLF radio signals collected on the DEMETER satellite
Global diagnostics ionospheric perturbations seismic activity VLF radio signals
2009/12/29
The analysis of the VLF signals radiated by ground transmitters and received on board of the French DEMETER satellite, reveals a drop of the signals (scattering spot) connected with the occurrence of ...