Aiming at the problems of improper structural repair and loss of mural detail reconstruction after repairing during the process of damaged mural image inpainting, mural inpainting progressive generative adversarial networks based on structure guided is proposed. Firstly, a structure generator is des...

Accurate position information is essential for the robots to complete tasks such as picking, sorting, and assembling workpieces. However, the location accuracy of the prediction box is sensitive to the design of the loss function of the object detection algorithm. The four boundary information's cor...

Scattering from cavity-type targets such as air intakes is an important part of scattering from stealth vehicles, and the existing studies on scattering from cavity-type targets do not give results on scattering characteristics of cavity-type targets after installation. By applying the carrier-to-ca...

The inverse distance weight interpolation method has a wide range of applications in aerospace, but it only considers the distance relationship and ignores the azimuth relationship. This shortcoming is addressed by the adjusted inverse distance weight interpolation method with position shading, alth...

Target detection based on deep learning is a research hotspot in computer vision. Although existing mainstream detection models usually increase the depth and width of the network to acquire better detection results, it is unamiable to suffer from parameters increasing and detection rate decreasing....

The signer can identify a verifier using the strong designated verifier signature (SDVS) scheme. Only the selected verifier can confirm that the signature was created by the signer. Using the trapdoor generation process, we first built a lattice-based strongly designated verifier signature scheme an...

Integration of the global navigation satellite system (GNSS) and the inertial navigation system (INS) can effectively improve the accuracy and reliability of the navigation system, and therefore has been widely used in many applications. In particular, the Kalman filter is commonly used in the fusio...

The cavity flow, especially at high Mach numbers (Ma>2), is complicated due to strong shock waves and shear, separation vortices, and their mutual interference. The mesh distribution and the quality of mesh generation thus significantly affect simulation results. The adaptive detector based on un...

Due to the flexibility of modern aircraft wing, geometric nonlinearity cannot be neglected. Based on dynamic response data samples, non-linear stiffness coefficients in structural dynamics equation are identified based on harmonic balance and fast Fourier transform, and a non-linear structural order...

As China’s aviation traffic keeps growing, issues including dwindling flight schedule resources and major flight delays in airport clusters are rapidly becoming more and more prevalent. It is necessary to thoroughly study flight schedule optimization in airport groups. On the basis of defining the c...

Aviation network traffic has increased day by day, and operations between airports are closely coupled. Airport risk diffusion has grown to be a major issue that affects their ability to operate safely and effectively. However, the spread mechanism of airport risk at the network level has not yet be...

Numerical simulation of helicopter brownout is a major analysis method to investigate the evolution characteristics of helicopter brownout. However, the sand cloud is composed by many sand particles with complex characteristics resulting in a large computational cost. Based on a discrete element met...

Forced vibration occurs in wind tunnel experiments, thus, the data measured by balance is the aliasing of forced vibration and the aerodynamic force of a model. This affects the accuracy of force data. To address this problem, data processing technology of balanced dynamic characteristics is propose...

The 2A12-T4 aluminum alloy specimen exposed to the coastal atmosphere for 20 years was analyzed with spherical aberration corrected transmission electron microscope. The presence of nitrogen was first determined in the corrosion products at the deepest corrosion part of the longitudinal section of t...

The skipping flight process of the skipping missile can be modeled as a set of time-varying nonlinear differential equations which cannot be solved analytically. Therefore, it brings great difficulties to optimize the trajectory optimization of the skipping missile. To solve this problem, a deep rei...

The traditional direct attitude determination or least square method depends on the correct fixation of the ambiguity. When the number of satellites is small or there is interference, the success rate of ambiguity will be greatly reduced, which will lead to inaccurate attitude determination results....

As the development of new energy vehicles has been considered an important strategy for China on becoming an automobile power, electric vehicles, and power batteries have been broadly researched. However, the difficulty in evaluating battery lifespan and health state limits the further application f...

Tethering behaviour is the sharing of an Internet connection service with other connected devices by using a mobile smart device as a NAT gateway. It will share the smartphone's data plan, especially the unlimited data plan. So, it can put ISPs under additional pressure to operate mobile Internet an...

The practical application of reinforcement learning (RL) in an unmanned aerial vehicle control is restricted by low learning efficiency. An algorithm integrating RL with imitation learning was proposed to improve the performance of autonomous flight control systems. By establishing new loss and valu...

To improve the damage efficiency of infrared imaging guided missile fragment warhead against military aircraft, a typical air-to-ground combat aircraft is taken as the research object, and the aim point selection method of fragmentation warhead against combat aircraft in two case is proposed. Based ...

The surrogate-based optimization method can greatly improve the efficiency of high-precision numerical optimization, while the infill sampling method is very important for the optimization result and efficiency. Several training samples can be infilled using the parallel infill sampling approach in ...

Compared with common piezoelectric stack actuators, the dual-piezoelectric stack actuator exhibits displacement amplification functionality, but suffers from poor positioning accuracy due to the inherent hysteresis nonlinearity of piezoelectric materials. To reduce the hysteresis nonlinearity of dua...

The point cloud acquired by airborne LiDAR has the complex characteristics of uneven distribution of categories and large differences in sample elevation. Existing methods are difficult to fully identify fine-grained local structures. This paper proposes an end-to-end network for airborne LiDAR poin...

This paper addresses the cooperative continuous monitoring coverage problem of multiple mobile robots for key target areas in complex environments. It is assumed that a number of obstacles and fixed observation points are distributed in the target area, and that the historical measurement data of th...

Radar imaging technology can capture rich feature information of a target, which provides important basis for target recognition. Vortex electromagnetic wave imaging technology, a widely discussed topic, can capture high-resolution two-dimensional images of relatively stationary targets. To achieve ...

Focusing on the fast leveling requirements of the vehicle-mounted platform under heavy load conditions, the error caused by the deformation of the legs during the leveling process can be accurately calculated by using electric cylinders. To solve the issue of the low leveling accuracy for traditiona...

Aiming at the problems that small-scale faults tend to be missed and misjudged when detecting borehole images of aero-engines by using traditional methods, a new method based on self-attention semantic segmentation (SA-SS) model is proposed. Based on the overall architecture of classical semantic se...

Based on the self-developed radial penetration tester, a series of seepage failure tests and stable seepage tests on sand were carried out under various filter pore size conditions to study the influence of filter pore size on the radial permeation characteristics of sand. The influences of filter p...

Rare time series classification (RTSC) is widely used in astronomical observation and other fields. Aiming at the problems of low accuracy and high time cost in the current rare time series classification methods for large-scale data, RTSC-FS is proposed, which takes the short-time scale rare celest...

Ionospheric error is one of the main error sources of global navigation satellite system (GNSS). The key to correct ionospheric error is to determine the total electron content (TEC) of ionosphere. Aiming at the problems of low accuracy of empirical model, cumbersome calculation of spherical harmoni...