In this paper, a novel deceptive jamming signal generation method against the space-borne Synthetic Aperture Radar (SAR) is proposed for electronic warfare (EW) system. By using off-line parallel computing modulation function in distributed sub-scenes, algorithm can highly reduce computation burden of extended scenes real-time jamming. The measured data from an experimental jammer system and simulation results are used to demonstrate performance method. It shown that provides reliable be...

In this study, vibration and noise experiments are conducted under dry wet conditions using a customized small-scale brake dynamometer testing three friction blocks with different geometrical shapes. The effect of the block shapes on generation characteristics is evaluated analyzed. results show that exhibit differences conditions. state, all samples successive vibration. triangular exhibits strongest acceleration highest sound pressure level, which resulted from higher contact stress at...

Spectral gamma-ray logging stands out as an efficacious methodology in the exploration of uranium(U). In order to address challenges associated with low statistical efficacy spectral analysis and mitigate impact drift, machine learning algorithms such Back Propagation (BP) neural network, Generalized Regression Neural Network (GRNN), Support Vector Machine (SVM) have been employed for quantitative interpretation uranium. A method rooted energy has proposed, catering high-speed spectra...

Radar target/environment simulators are usually developed for testing and evaluating various radar systems. In this paper, we present a novel implementation of real-time environment simulator with four channels missile-borne Synthetic Aperture (SAR). By using wideband Digital Radio Frequency Memory (DRFM) technique parallel computing based on the Field Programmable Gate Array (FPGA), can provide computation capability raw SAR echo signal generation extended scenes very small computational...

Abstract In this study, experiments are conducted to evaluate the effects of friction block shapes and installation angles on brake noise high-speed trains a customized small-scale dynamometer. Friction blocks in three different (circle, triangle, hexagon) triangular/hexagonal at used tests. The results indicate that circular triangular exhibit low sound pressure with multiple harmonics, whereas hexagonal produces highest single dominant frequency. This difference is attributed high contact...

In this study, a bespoke small-scale brake dynamometer was developed to simulate the braking conditions of railway disc system. Braking squeal experiments were performed with at different pressures and rotation speeds, influence these parameters on generation characterization noise evaluated discussed. The obtained results show that both pressure speed have significant evolution noise. Higher speeds are found result in higher sound more complicated spectra, except particular pressure, for...

In this research, the tribological and dynamical characteristics of a brake pad with multiple blocks are investigated using experimental numerical methods. A dynamometer multiblock configuration on disc is developed series drag-type tests conducted to study squeal wear behavior high-speed train system. Finite element analysis performed derive physical explanations for observed phenomena. The results show that rotational speed braking force have important influences squeal; trends...

A Method, to locate eye in image by using gray projection, is presented. We utilize the differential projection cure of facial vertically position and integral horizontal position. The method can apply not only upright front side face, but also lift up face low face. When obliqueness, we may use blocks projection. So could process rotated images. simple its calculation less. experiment results show that eyes be located quite accurately

In order to improve the surveillance effect of aviation target radar, this paper improves traditional filtering algorithm and builds channel optimization system ADS‐B radar based on improved algorithm. Moreover, uses improvement ensure positive definite or semipositive definiteness state covariance root mean square volume Kalman filter avoid divergence tracking interruption caused by nonpositive matrix; principle interactive multimodel is use multiple filters for parallel processing achieve...

To detect Android malware samples, a classification model is proposed in this paper. traditional detection and identification techniques are usually divided into static analysis dynamic analysis. of interrelated data sets effect not good, good but the resource consumption rate high. In face problem, we made improvements based on an artificial intelligence-based solution to achieve purpose malicious attack software by extracting feature datasets from source code then using algorithmic models...

In this paper, we propose an imaging algorithm of missile-borne SAR in diving and squint mode.The acceleration, vertical speed, angle caused a large range cell migration (RCM).The divides the RCM correction (RCMC) into two steps.Firstly, correcting main part walk time domain.Secondly, remaining RCMC frequency-azimuth Doppler frequency domain, using analytical form signal 2-D spectrum derived by method series reversion.Theoretical analysis simulation results illustrate its validity, satisfy...

Essential tremor is a common movement disorder. Numerous validated clinical rating scales exist to quantify essential severity by employing rater-dependent visual observation but have limitations, including the need for trained human raters and lack of precision sensitivity compared technology-based objective measures. Other continuous methods amplitude been developed, frequently provide unitless measures (e.g., power), limiting real-world interpretability. We propose novel algorithm measure...

This paper explores the modeling method of rangevelocity deception jamming, which can deceive victim radar on range and velocity information simultaneously.By analysis producing mechanism, maneuvering strategies pulling rules this basic mathematical models are established by stages, as well target echo jamming for pulse compression radar.Then based with LFM Barker phase-coded signal, specified deduced.Simulation results show received signal waveform when is presented in range-gate-pull-in...

摘要: 该文提出一种基于相位匹配原理的噪声调幅干扰下LFM信号检测方法。推导了噪声调幅干扰信号载频估计方法,利用干扰信号载频信息,实现信号的相位匹配,并基于最小二乘相位匹配方法实现LFM信号检测。仿真结果证明了文中原理和方法的正确性。 关键词: 信号检测; 噪声调幅; 线性调频; 相位匹配