This paper studies the “intermittent” chaos and subharmonics observed in switching dc/dc converters using a simple circuit model that describes possible unintended coupling of some weak spurious signal to the converter. The study shows that the signal strength and frequency of the intruding signal are vital parameters that affect the type of intermittent behavior and the period of intermittency...

speckle is a granular disturbance in coherent images such as synthetic aperture radar (sar) images, modeled as a multiplicative noise. this noise degrades the sar image and complicates the image exploitation using automated image analysis techniques. several approaches have been developed to reduce the effect of speckle noise. recently, the application of compressed sensing (cs) is explored in ...

using a new numerical model, the pump-to-signal relative intensity noise (rin) transfer in singlepumpfiber optical parametric amplifiers for low modulation frequencies is investigated. the model includesfiber loss, pump depletion, as well as the gain saturation, and therefore, it can describe the practicalcircumstances associated with various applications of fiber optical parametric amplifiers....

This article solves the problem of detecting water leaks with a minimum size down to 1 mm in diameter. Two new mathematical tools are used solve this problem: first one is Te cross-spectral density and second coherence. These provide possibility discriminating spurious frequency components, making use property multi-sensitivity. advantage makes it possible maximize sensitivity spectrum. The wav...

This research presents the review of Analog to Digital Convertor (ADC). For ADC there are mainly four different methods, Flash ADC, Pipelined ADC, Successive Approximation ADC, and Sigma Delta ADC. The Flash ADC is the Fast ADC. For Designing the ADC, the parameters important are Static and Dynamic. In static parameters Differential Non Linearity Error (DNLE), Integral Non Linearity Error (INLE...

Details are presented of recent improvements to hardware and analysis code components of the DIII-D density profile reflectometer system. The improvements to the hardware increased the system signal-to-noise ratio and reduced spurious reflections. An improved automated method is developed to accurately determine the zero density plasma start position. With these improvements the uncertainty in ...

Magnetic resonance spectroscopy is increasingly recognized as one of the key diagnostic modalities in oncology. This type of spectroscopy can detect early radiation damage to biomolecules as a salient feature of malignancy. Notwithstanding such appealing characteristics, progress in magnetic resonance spectroscopy is currently hampered by the lack of mathematically and clinically reliable spect...

This paper presents an effective weighted-L1-sparse representation of array covariance vectors (W-L1-SRACV) algorithm which exploits compressed sensing theory for direction-of-arrival (DOA) estimation of multiple narrow-band sources impinging on the far field of a uniform linear array (ULA). Based on the sparse representation of array covariance vectors, a weighted L1-norm minimization is appli...

The receiving performance of a frequency hopping receiver based on interference and frequency-to-time mapping are analyzed. broadening the passband induced by high speed is theoretically spurious-free dynamic range (SFDR), frequency-dependent RF gain, average signal-to-noise ratio (SNR) corresponding to gain derived indicate performance. Experimental verifications SFDR were conducted. at 7.21 G...