In order to get rid of the dependence on Global Navigation Satellite System (GNSS) and overcome the problem that it cannot work under the condition of intentional or unintentional interference, we can use Signals of Opportunity (SOP) to realize positioning. Low earth orbit satellite SOP have advanta...

In order to improve the efficiency of the existing multi-channel image Empirical Mode Decomposition (EMD) methods, this paper presents a fast multi-channel image EMD method based on morphological filter. It uses the morphological expansion and erosion filters to compute the upper and lower envelopes...

During the manufacturing process and service period, the crack damage may occur in the facesheet of titanium honeycomb sandwich structure. The influence of one side facesheet crack damage on flexural properties of titanium honeycomb sandwich structures was studied experimentally and numerically. The...

The structure layout of hyperspectral greenhouse gas monitor on FY-3D satellite is very compact. There are eight optical lens, twelve electronic devices and three motors in the small-scale space. There are so many optical lens with high-precision temperature control requirement and so many heat sour...

In this paper, the reliability model of a competing failure degradation system with a change point is proposed. The system is subject to continuous internal wear degradation and external shocks, the internal wear degradation is described by an uncertain process, and the external shock is a renewal r...

For the purpose of meeting the requirement of application on-orbit for Loop Heat Pipe (LHP), a transient numerical model of LHP, which is used for the thermal control of Charge-Coupled Device (CCD) of GF-9 satellite, is developed by using the node-network method and flow and heat transfer relation f...

Support personnel configuration and scheduling for support operations are two core contents of decision making for the carrier-based aircraft sortie support, and the practical problem of joint optimization for support personnel configuration and scheduling under complex constraints within flight dec...

In order to solve the problem of steam flow excited vibration caused by rotor eccentricity in steam turbine and the defects of static eccentric rotor whirling motion model in rotordynamic characteristics study, the dynamic mesh was adopted to simulate the authentic rotor three-dimensional whirling m...

The reconfigurability of system, that is, the ability of autonomous recovery of fault system, has been highly concerned by scholars with the continuous improvement of system security and reliability requirements. However, the existing quantitative evaluation methods for the reconfigurability of cont...

Hypersonic boundary layer transition has an important influence on friction drag and heat transfer, and thus accurate prediction and control of boundary layer transition are critical to the development of hypersonic vehicles. In this paper, experimental study on a 7° half-angle sharp cone was conduc...

In the scenario of intercepting a Hypersonic Glide Vehicle (HGV), the trajectory prediction is a key issue for successful interception. Considering HGV's strong maneuverability and variable trajectory, in this paper, a novel trajectory prediction method is proposed based on Support Vector Machine (S...

For flight's characteristics of morphing and speed change in the conversion mode of Quad Tilt Rotor (QTR) aircraft, a comprehensive method based on flight dynamics model is proposed to calculate the conversion corridor of QTR aircraft. In this method, the boundary of lower speed and upper speed are ...

Laser communication technology has wide application prospects. The coarse pointing mechanism for periscopic laser communication is taken as the research object. The equivalent finite element modeling method of the mechanism is proposed, and then the corresponding finite element model is established....

In this paper, the crack propagation and interface debonding in the adhesive layer of bonded joints were analyzed based on the coupling method of Extended Finite Element Method (XFEM) and Cohesive Zone Model (CZM). By using the cohesive interfacial element and surface-based cohesive contact to descr...

To deal with the strong interaction between position loop and pressure loop in the electro-hydraulic load sensing control system, we propose a decoupling strategy based on Active Disturbance Rejection Control (ADRC) in this paper. First, according to the equation expressions built by theoretical ana...

The characteristic of time is an important requirement for system tasks, especially in complex industrial systems. This paper adopts Graphical Evaluation and Review Technique (GERT) to build the stochastic network model of task flow. Considering the queued execution of activities caused by resource ...

The noise robustness and parameter accuracy are poor when the classical Multiple Signal Classification (MUSIC) algorithm is used to estimate parameters of the one-dimensional Geometric Theory of Diffraction (GTD) scattering center model. To solve this problem, a series of improved MUSIC algorithms a...

Global Navigation Satellite System/Inertial Navigation System (GNSS/INS) integrated navigation that could provide continuous and high-accuracy position, velocity and attitude are widely used in UAV state estimation. Particularly, the design of filtering algorithm is the key to the integration. Besid...

In order to solve the problem that the traditional radiator threat assessment method is not closely related to the dynamic situation of air combat and to improve the assessment accuracy, an algorithm combining the inverse form of Poisson distribution with Technique for Order Preference by Similarity...

For the radio fuze combining chaotic code bi-phase modulation with linear frequency modulation, a ranging method based on instant correlation frequency domain detection is proposed to achieve precise ranging for the ground targets with different scattering characteristics. Before instant correlation...

Aimed at the issue of co-channel interference estimation in the Geostationary Satellite Orbit (GSO) system layout, the interference assessment scenarios were designed with the global distribution of earth stations and satellites for downlink and uplink and the integrated impact of beam service chara...