A new photonic-assisted instantaneous frequency measurement system is presented. It overcomes the latency problem in reported structures based on frequency-to-time mapping technique or frequency-to-power that involves a long length of fiber, and at same time, enables incoming microwave signal to be measured over wide range with only small errors. The generates three low-frequency signals. phase...

This paper presents a novel technique for separating convolutive mixtures of statistically independent non-Gaussian signals. The time-domain convolution is transformed into several instantaneous mixtures in the frequency-domain. The separation of these mixtures is performed in two steps. First, the instantaneous mixture at the frequency of reference is solved using JADE and the other mixtures a...

—A time-frequency approach for improved instantaneous frequency estimation of noisy signals has been proposed. This approach is based on the averaged multiple time-frequency distribution obtained by using L-spectrograms with different values of the scaling parameter L. The L-spectrogram with low value of L is characterized by large bias and low variance, while higher L decreases the bias and in...

An instance of the Viterbi algorithm has been applied to the cubic phase function and chirp-rate estimation. The proposed algorithm has shown excellent performance for high noise environment. The obtained chirprate estimate is used in the instantaneous frequency estimation. The proposed instantaneous frequency estimator gives superior performance with respect to the state-of-the-art techniques ...

In the field of nonstationary signal analysis and processing, short-time Fourier transform (STFT) is frequently used to convert signals into time-frequency domain. The instantaneous frequency (IF) STFT defined as time derivative phase plays an important role in reassignment method synchrosqueezing (SST). this paper, we propose a framework design window function for computing IF STFT. Computing ...

We study mechanical behavior of soft rubber-like digital materials used in Polyjet multimaterial 3D-printing to create deformable composite materials and flexible structures. These soft digital materials are frequently treated as linear elastic materials in the literature. However, our experiments clearly show that these materials exhibit significant non-linearities under large strain regime. M...

The shoreline is one of the most important features on earth’s surface. It is valuable to a diverse user community. But the dynamic nature of the shorelinemakes it difŽ cult to be represented in a naturally dynamic style and to be utilized in applications.The ofŽ cially usedshoreline,for examplein nauticalcharts,is the so-calledtide-coordinatedshoreline. It is also the shoreline that makes the ...