In this paper, parameter estimation of linear frequency modulation (LFM) signals containing additive white Gaussian noise is studied. Because the center an LFM signal affected by error propagation effect, resulting in a higher to ratio (SNR) threshold, method for based on time reversal proposed. The proposed avoids SNR loss process estimating frequency, thus reducing threshold. simulation resul...

The measurement of brachial artery vasodilation in response to a hyperaemic stimulus has been used extensively to assess changes in endothelial function. However, whether or not similar changes occur in response to an active hyperaemic stimulus is unknown. The purpose of the present study was to compare brachial artery vasodilation in response to an active compared with a reactive hyperaemic st...

To overcome the problem of insufficiency linear frequency modulation (LFM) radio fuzes against sweep-type jamming, a method is proposed to classify and identify fuze targets interfering signals based on third-order spectrum features. Using measured data an LFM fuze, spectral transform applied output detector end under action target several amplitude modulated sweeping signals, mean value, entro...

Light Field Microscopy (LFM) is an imaging technique that captures 3D spatial information with a single 2D image. LFM attractive because of its relatively simple implementation and fast volume acquisition rate. Capturing time series at camera frame rate can enable the study behaviour many biological systems. For instance, it could provide insights into communication dynamics living neural netwo...

Recommender System helps users to find interesting items through analysis of users’ behavioral patterns. After nearly 20 years’ work on this area, researchers have put forward a variety of recommendation models and algorithms to fulfill this goal. Among them, SVD and other factorization techniques have been widely used since they were put forward. This paper first describes the definition and g...

Nanometer films composed of model ternary blend of deuterated polystyrene (dPS), poly(2-vinylpyridine) (PVP) and poly(methyl methacrylate) (PMMA) were studied after spin-coating from a common solvent. Surface undulations and the distribution of phase-separated domains at the surface and in the bulk are closely related as revealed by atomic (AFM) and lateral (LFM) force microscopy. For the first...

The calculation of wideband digital beamforming using traditonal methods is so large that it is hard to realize in project. This paper describes a wideband digital beamforming method on the base of stretch processing for linear frequency modulated (LFM) waveforms. This method offers advantages that are moderate data rate for wideband signal processing by reducing the signal bandwidth greatly. I...

This study proposes an anti-jamming scheme for linear frequency modulated (LFM) radars to combat smart noise jamming, which is a newly proposed pattern that is very effective against LFM radars. First, by utilizing the smeared spectrum technique, the chirp rates of the target return and jamming signal can be changed. The target return and jamming signal then exhibit different characteristics af...