As the current multi-segment signal fusion algorithms cannot meet requirement of high-precision frequency estimation at different signal-to-noise ratios (SNRs), an adaptive algorithm is proposed in this paper. At high SNR, autocorrelation weighted utilised, which adopts real-time signals, resulting denoised sinusoidal signals. Then obtained by minimising error function based on coarse estimatio...

Seismic waves are non-stationary due to its propagation through the earth. Time-frequency transforms are suitable tools for analyzing non-stationary seismic signals. Spectral decomposition can reveal the non-stationary characteristics which cannot be easily observed in the time or frequency representation alone. Various types of spectral decomposition methods have been introduced by some resear...

The characterization and understanding of rock deformation processes due to fluid flow is a challenging problem with numerous applications. The signature of this problem can be found in Earth Science and Physics, notably with applications in natural hazard understanding, mitigation or forecast (e.g., earthquakes, landslides with hydrological control, volcanic eruptions), or in industrial applic...

Ultra-high-frequency (UHF) partial discharge (PD) monitoring is gaining popularity because of its advantages over electrical methods for onsite/online applications. One such advantage the possibility three-dimensional PD source localization. However, it necessary to understand signal propagation and attenuation characteristics in transformers improve Since are available a wide range ratings geo...

The effect of optical illumination on DC and dynamic performance of Si1-xGex based double drift region (DDR) (p+pnn+) IMPATT diode operating at W-Band is investigated and compared with its Silicon counterpart. Top Mounted (TM) and Flip Chip (FC) structures are chosen and the composition of photocurrent is altered by shining light on the p+ side and n+ side of the device through optical windows....

We studied the injection-locking properties of a resonant-tunneling-diode terahertz oscillator in small-signal injection regime with frequency-stabilized continuous THz wave. The linewidth emission spectrum dramatically decreased to less than 120 mHz (half width at half maximum) from 4.4 MHz free running state as result locking. experimentally determined amplitude voltage antenna caused by inje...

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