The global navigation satellite system (GNSS) has a number of disadvantages such as weak signal strength on the ground, high infrastructure requirement and easy to be interfered, while signals of opportunity can make up these shortages. Space-based signals of opportunity positioning based on IRIDIUM...

In this paper, in order to solve the problem of natural convection in a porous square cavity containing an internal heat source, the non-orthogonal multiple-relaxation-time (MRT) lattice Boltzmann method was used. The influence of the value of Rayleigh number(10⁴ ≤ Ra ≤ 10⁶), internal heat source la...

In order to improve the mobile launch capability of space vehicle, the position, height, velocity magnitude, velocity azimuth and trajectory inclination of the injection point were used as terminal constraints to design the ascent trajectory under the condition that the mid-flight trajectory was det...

In view of the current research status on the finite element simulation study of shot peening, such as the projectiles' regular arrangement and the peening coverage cannot be calculated precisely, a finite element model with multiple randomly distributed shots whose number depends on the peening cov...

With the rapid development of electric vehicles, large-scale electric vehicle charging behavior will bring tremendous influence on the planning and operation of electric power systems. It is more and more urgent to study the charging behavior of electric vehicles and its influential factors, and pre...

The flight mission planning and scheduling method based on finite state machine (FSM) was proposed for planning and scheduling the rendezvous and docking (RVD) flight mission of manned spacecraft rapidly and exactly under multi-constraints. The graphical mission planning and scheduling model was est...

In uncertain environment such as bad weather, it is easy to cause a large number of flight delays by the traditional time slot allocation method. To solve this problem, the time slot allocation process is first analyzed. Then a two-stage programming model for time slot allocation under uncertain cap...

Low-dose CT (LDCT) is widely used for clinical diagnosis to reduce radiation risk to patients. However, the radiation dose reduction introduces mottle noise and streak artifacts into the reconstructed LDCT images. In this paper, a post-processing technique is proposed based on variable order variati...

The inverse synthetic aperture radar (ISAR) imaging of the space target is affected by target's own occlusion and noise interference, which makes the generated ISAR image difficult to be directly used for image analysis and target recognition. Therefore, the ISAR image processing and feature extract...

The bolter characteristics have significant effect on the approach airspeed determination of a carrier-based aircraft, the grade limits of ship speed and sea state during carrier landing. Three parameters are proposed as the safety indexes according to the bolter task requirements. They are taxing d...

For the pursuit-evasion problems between an active defense aircraft which can launch a defending missile from itself and an attacking missile, a guidance law for aircraft and defending missile is derived and analyzed based on the differential game theory. First, Optimal guidance strategies with boun...

To determine the initial velocity of tank explosion fragments under the propellant detonation, the fragment initial velocity (FIV) model was established based on the energy conservation law, in which the kinetic energy of explosion fragments, the kinetic energy and internal energy of detonation prod...

Dirichlet distribution is a kind of continuous multivariate probability distribution with positive parameter vectors, which is widely used in proportional structure problems. Expectation maximization (EM) algorithm and dynamical clustering algorithm of Dirichlet mixture samples are presented, their ...

To deal with the issue of dynamic coupling, thrust vector control redundancy and vulnerability to disturbed wind for vertical and/or short take-off and landing (V/STOL) aircraft in hover/translation mode, a robust coordinated decoupling flight control method based on high-order linear active disturb...

When GPS receiver measures the propagation distance from satellites to the receiver, it can usually obtain two basic measurement values, code phase and carrier phase. Although the precision of carrier phase measurement is higher than that of code phase measurement, there exists the integer ambiguity...

It is difficult to accurately predict the gradual failure of electromechanical actuator (EMA) in an aircraft flight control system. The flight safety of an aircraft will be affected by these faults if they are not detected in early stage. A fault diagnosis method based on dynamic wavelet neural netw...

Research on conflict evidence decision methods is an important research topic of evidence theory. In view of the existing problems in the evidence theory improvement process, such as large computational complexity, unreasonable normalization process and unsatisfactory evidence combination, this pape...

Traditional all-in-focus image fusion based on the multi-focus images which are captured by multiple-exposure of the camera. Light field camera has the ability of calculating the refocused images at any depth after a single exposure, which makes it more advantageous in all-in-focus image calculation...

UAV data link communication is subject to natural and artificial interferences. The signal-to-noise ratio (SNR) is an effective evaluation indicator of channel state and communication quality. In order to address insufficient SNR estimation accuracy involved in traditional estimation algorithm, an e...

For multi-classification image tasks, a residual triplet network based on deep convolution is proposed, which aims to train neural networks to obtain useful feature representations through residual learning and distance comparison. Firstly, a 21-layer deep convolution neural network is designed as t...

Aimed at the problem of GPS data interruption in the UAV INS/GPS integrated navigation system, an improved filtering algorithm is designed. Firstly, the kinematics model of UAV navigation is established. Then the traditional extended Kalman filter (EKF) technique and strong tracking filter are combi...

Aimed at multi-directional actuator deformation mechanism, this paper takes the soft bionic tongue as research object and the research on the motion characteristics of one/multi-directional actuator for the soft bionic tongue is carried out. Firstly, a soft bionic tongue driven by pneumatic actuator...

In the future, time-triggered communication mechanism will be more widely selected for information transmission to ensure the certainty of information interaction in avionics system. How to reasonably implement time-triggered communication scheduling design is the key to time-triggered application t...

The rotor system with turbine mid frame is researched as an objected, and the dynamic model with coupling vibration in transverse and angular degree was employed to reveal the vibration coupling mechanism and influence in shared support-rotors system. It is pointed that support response of one rotor...