In the cases of rapidly moving interference and look-direction error, robustness output signal to noise ratio (SINR) conventional wideband adaptive beamforming methods are degraded severely. order solve these problems, a robust with null broadening constant beamwidth is proposed. We first propose taper matrix constructed by adding virtual interferences for broadening, where reference frequency number determined based on numerical methods. This followed reconstructing array covariance matrix....

The machining difficulty has limited the further application of ultra-hard materials. For V-shaped coarse-grained electroplated cubic boron nitride (CBN) grinding wheel, a precise and efficient pulse laser truing method was proposed. Firstly, theoretical model process established in order to optimize energy distribution. Secondly, effects depth, wheel speed, power time were analyzed. Finally, performance trued wheels evaluated. results showed that larger speed n would bring higher value more...

Multimedia instrument training has gained great momentum benefiting from augmented and/or virtual reality (AR/VR) technologies. We present an AR-based individual system for piano performance that uses only MIDI data as input. Based on fingerings decided by a pre-trained Hidden Markov Model (HMM), the employs musical prior knowledge to generate natural-looking 3D animation of hand motion automatically. The generated demonstrations are rendered in head-mounted displays and registered with...

The constant beamwidth beamforming is a key technique and research focus in the broadband array signal processing. However, most conventional methods can only satisfy mainlobe width performance will degrade severely when sidelobe interferences exist. To overcome this problem, for suppressing proposed. In proposed method, modified blocking matrices of different frequency bins are firstly constructed interference cancellation data domain, afterward, minimum variance distortionless response...

For the suppression of rapidly moving interferences in wideband beamforming, an adaptive null broadening method is proposed. In proposed method, taper matrix calculated by adding virtual around original interferences. Then, based on obtained and sample covariance matrix, reconstructed to calculate weight vector for broadening. Simulation results verified effectiveness method.

The wideband adaptive beamforming method would deteriorate severely when the desired signal is contained in training snapshots, especially mismatched steering vector existed simultaneously. Therefore, a robust proposed based on focusing transformation and compensation. In method, received signals are first decomposed into narrow sub-bands. Then, direction of arrivals signals, interference plus noise covariance matrix each sub-band reconstructed to remove transformed reference frequency by...

The smoke detection in remote video surveillance is of great importance forest fire prevention since usually appears before fire. In order to solve this problem, we proposed a novel algorithm based on fast self-tuning background subtraction segmentation and judgments analysis. First, utilized the source image segment candidate regions, which overcomes drawbacks color-based motion-based methods. Then static dynamic are applied regions identify region. Experiment results demonstrate that our...

Range false target created by Digital Radio Frequency Memory (DRFM) repeat jammer is a very common deception jamming in Electronic Counter Measures (ECM). In this paper, cancellation method based on Slope-Varying Linear Modulation (LFM) chirp signal proposed to suppress kind of signal. the method, radar firstly transmits LFM with varying slope at each pulse repletion intervals (PRIs). following, reconstructed using parameters range target, which are estimated from marched-filter output....

Smart noise jamming based on digital radio frequency memory (DRFM) has both oppressive effect and deceptive effect, it is difficult to be effectively suppressed by traditional anti-jamming methods. In order solve this problem, an method for linear modulation (LFM) pulse compression radar system proposed. The proposed combined with fractional Fourier transform (FrFT) domain filtering strategy. Here, first, the FrFT performed received signal, optimal angle calculated calculating fourth-order...

Distributed array radar is widely applied to suppress the mainlobe interference due large equivalent aperture with auxiliary array. In general, distributed only can a certain number of interferences because limited unit radars. When there exist multi interferences, especially massive sidelobe performance suppression degrades severely. To solve this problem, radars adopt phased system and spatial multi-interference method based on joint adaptive weight for proposed in paper. method,...

Interactive image segmentation is able to extract the user-specified foreground objects from whole image, which remains be a challenging problem in processing and computer vision. The traditional pixel-based interactive time-consuming neglects neighbor information, hard achieve efficient accurate results. To address this problem, novel region-based approach proposed for segmentation. algorithm contains three stages: initial by Simple Linear Iterative Clustering (SLIC) superpixels, region...

WC-10Co-4Cr coating was deposited on Ti-6Al-4V by the high velocity oxygen fuel spray process to improve surface hardness and wear resistance. The results show that porosity of is 2.0%, microhardness 1300 HV0.2, roughness Ra about 6.0 μm, bonding strength 70 MPa. SEM XRD analyses composed WC, W2C, Co phases. Under condition dry sliding with a load 20 N frequency 10 Hz, volume rate 9.2 × 10−6 mm3/N·m, while 4.6 x10−4 which means significantly improves resistance Ti-6Al-4V. With increased from...

This letter proposes a step recovery diode (SRD)-based compact subnanosecond pulse transmitter. Working as charge switch, the SRD can cut off current of an inductor, generating pulse. Only one single low-power supply is used in transmitter, while large amplitude that greatly exceeds power voltage be generated. Simulation and experimental results have validated proposed transmitter has very good performance, being promising candidate for portable wearable ultrawideband (UWB) transceivers.

Orthogonal projection (OP) adaptive beamforming is widely applied in practical scenarios because of strong robustness. However, the performance traditional OP would degrade severely when at subarray level, especially asymmetrical configuration. To overcome this problem, improved orthogonal (IOP) based on normalization level proposed. In proposed method, covariance matrix firstly modified by normalizing noise power level. Subsequently, interference subspace estimated eigenvalue decomposition,...

We propose a beamspace transform method to estimate direction-of-arrival(DOA) of coherent signals on sparse uniform circular array(UCA). By incorporating necessary phase modes into the steering vector and introducing shift matrix before weight vectors, conjugate symmetric is rebuilt based mode excitation, therefore spatial smoothing can be applied deal with root-MUSIC also available decrease computational load. What's more, improves performance resolution under condition low SNR(signal noise...

We investigate the issue of combating interrupted-sampling repeater jamming (ISRJ). Due to advantages miniaturization, lightweight, and flexibility, ISRJ poses a great menace radar performance through fast sampling forwarding signals. Given this problem, we propose an electronic counter-countermeasure (ECCM) system based on time–frequency domain. The mines information echoes using de-chirping processing short-time Fourier transform (STFT). introduce binarization algorithm achieve noise...

In order to solve the problems of low assembly accuracy and poor consistency armature components, this paper analyzes asymmetric factors in process components influence different error factors. The aim is provide guidance for actual interference components. Firstly, based on simulation model was established, initial stress distribution area under ideal conditions studied. On basis, influencing caused by manufacturing offset press-fitting were introduced, internal variation obtained. results...

In this work, we have studied the optimal spectrum sensing interval, which is time between two consecutive activities, such that delay of cognitive transmission minimized. The throughput maximization radio always a common goal researchers, keenly related to transmission. Whereas mostly decided by interval for given primary user (PU) channel. Therefore, setting minimize secondary (SU). Especially, retransmission considered, deteriorates transmission; however, neglected most studies. Finally,...

In this paper, a DOA (direction of arrival) estimation method coherent signals based on uniform circular arrays, in the presence sensor mutual coupling, is proposed. Firstly, array considering coupling transformed into virtual geometric proportion through preprocessing. Then new covariance matrix reconstructed with eigenvector corresponding to largest eigenvalue, which consists all signals' information. addition, signal diagonal, means complete de-correlation. Finally, can be estimated...

The source number estimation is an important issue in space spectrum estimation. However, the performance of traditional algorithms will degrade severely when applied into colored noise. To overcome this problem, a new method based on power-inversion and adaptive threshold proposed. In proposed method, algorithm firstly to form array beam pattern with nulls direction sources. Subsequently, modified determined by sliding window processing for pattern. Finally, sources obtained through finite...