In view of the multi-objective group decision problem that the attribute values are interval grey numbers and the weights of experts unknown,the attribute weights partially known,the multi-objective decision-making method based on the kernel and the degree of greyness of the interval grey numbers is proposed. Simplified formation of Interval grey Numbers is given based on kernel and degree of greyness. The optimization model based on the kernel and the degree of greyness of the interval grey numbers is set up and the attribute weights can be solved. The schemes are aggregates with attribute weights. To calculate the grey correlation coefficient separately of the kernel and the degree of greyness of the interval grey numbers and combine both of them ,then the weights of experts can be obtained. Aggregate the expert opinion and compare the scores of schemes,the best scheme can be chosen. Based on this,a kind of Multi-attribute decision making model is put forward. Based on the kernel and the degree of greyness of the interval grey numbers .Finally,a numerical example to verify the feasibility and effectiveness of the method.
For the need of the clutter suppression in the simulation of radar system and the need of the improvement of the radar signal SNR to detect moving target,it analyzeds the commonly used delay line cancellation in MTI. Aiming at the disadvantage and shortage, it establisheds a geometric model based on the eigenvector method,and through comparing the simulation,it validated the feasibility and superiority of the eigenvector method.
Destruction on the aerodrome runway is one of the most important tasks for long-range guidance weapons,it judges of blockage by the min leave window. This paper simulates the distribution of burst points on the Aerodrome runway for long-range guidance rocket projectile by Monte-Carlo method,and put forward improved search method of the min leave window,and the method was applied for estimate influence degree on destruction of Aerodrome runway for cluster ammunition of long-range guidance rocket projectile on tactical and technical index. The computational results show that: the result made by the improved method is more accurate than method distinctly,and this method is more reasonable and scientific. The conclusions have reference and practical value for operation and optimization design for cluster ammunition of long-range guidance rocket projectile.
In view of traditional DES existing short key shortcoming,this article proposes a modified-des algorithm based on Logistic mapping. It improves the key space and enhances confusion of outputs. Meanwhile,it is used in the remote epuipment control system,enhancing the security of data transfer effectively.
Based on Lorenz system,a novel four-dimension hyper-chaotic system is presented via adding a state equation and designing a new piecewise linear function in this paper. Through the numerical simulation,the phase diagrams,Lyapunov exponential spectrums and bifurcation diagrams of the system are studied. The numerical simulation result shows that the four-dimension hyper-chaotic system is able to generate six-wing butterfly hyper-chaotic attractors. Furthermore,an electronic circuit is designed to implement the system. The circuit simulation results are in agreement with the numerical simulation results,which verify the realizability of the system.
A two-dimensional direction of arrival(DOA)estimation algorithm of coherent signals,called Mode-Space DOA Matrix(MS-DOAM) algorithm,is proposed.The algorithm uses mode-space excitation to transform the UCAs into virtual parallel linear arrays.Then,two equivalent covariance matrices are reconstructed by using cross-correlation information of array elements. A new DOA matrix is reconstructed besed on the two matrices. Eigenvalues and eigenvectors are acquired by performing eigenvalue decomposition of the DOA matrix. According to the eigenvalues and eigenvectors with elevation and azimuth information,the DOA of coherent signals could be estimated.The algorithm requires no parameter alignment and 2-D spectrum peak searching.Computer simulation confirms that the proposed algorithm achieved better performance than UCA-VSS algorithm under scenarios of low SNR and deficient snapshots.
The key of applying wireless sensor networks in reality lies on how to find and use the service in time and with efficiency. Following the analysis of existing service discovery mechanism for wireless sensor networks,this paper proposes a service discovery mechanism based on cluster for wireless sensor networks. The mechanism dynamically selects cluster head nodes according to the comprehensive performance index. Service requests and service response in the list of cluster head are transmitted according to the priority levels. It can improve the performance of service discovery and the stability of system. The performance of simulations shows that it is better than those similar service discovery mechanisms proposed in hit ratio and delay.
According to the need of condition monitoring for antiaircraft fire control system,the signal characteristics of antiaircraft fire control system is analyzed,and the digital signals to be collected for condition monitoring is determined. A parallel data acquisition program for digital signal of the fire control systems,and the specific implementation in terms of hardware is carried out. This design has a versatility of the equipment data collection,providing the necessary preconditions for further processing and analysis of data.
Synthetic Aperture Radar (SAR) gets two dimensional high resolutions through range and azimuth compression,but it will have difficulty in imaging when the platform has low height,high speed and large squint angle. Corresponding to the imaging problem,Frank code sequence is optimized with Cyclic Algorithm and used as the transmitted signal. Good correlation performance of Frank sequence,combined with proper PRF,help the SAR eliminate Doppler ambiguity and enhance the resolution of imaging,finally good imaging performance is gotten. Simulation results testified the good imaging performance brought by the optimized Frank sequence and proper PRF value.
It is the key issue of the construction of equipment support systems that the integration of equipment support is realized by networking. Based on analysis of the basic theory of complex networks structural vulnerability,the nodes and links in the equipment support network are defined,and the topology model of typical equipment support network is built; the random failure and deliberate attack failure for the equipment support network is put forward,and the simulation of structural vulnerability under the different topology model and different mode of failure for the equipment support network is carried out,and the research provide reference for the construction and protection of the equipment support network. The results shows that setting more links between the different equipment support units can improve the invulnerability of equipment support network with the purpose of defense.On the other hand,the mode of attacking based on the evaluations of the last attack can upgrade the efficiency rapidly with the aim of paralyzing the equipment support network.
Considering influence of impact of rocket artillery during the launch to the off-road vehicle vertical and pitching vibration's vibration characteristic,the simulation models of an interconnected HPS of two bridge from front and back and an independent HPS were built based on the mathematic model and AMESim software,studied the impact and vibration effects on the off-road vehicle in the emission process,and compared with that with an independent HPS,analyzed the stiffness characteristics of the two type of hydro pneumatic suspension,research shows that: the interconnected hydro-pneumatic suspension can effectively reduce the vertical vibration acceleration and pitch angular acceleration,balance different axle load,keep stable for off-road vehicle quickly after emission,reduce the destruction on the off-road vehicle.
In order to master the force of ramming mechanism key component which on automatic loading system of a certain artillery with time varying load, the virtual prototype simulation model of ramming mechanism is built and verifies based on the multi-body dynamics software RecurDyn,then the modal analysis is carried out in ANSYS to get the main performance of ramming chain in the low order natural frequency. The load files of multi-body dynamics system are extracted,transformed and imported into the finite element transient dynamics analysis,the co -simulation based on the heterogeneous system information of multi-body dynamic and FEA is carried out,the precision and efficiency of simulation are improved. The force of key components in ramming process is get to determine the dangerous location,the basis of the mechanisms failure and fault evolution of ramming mechanism is provided by the results.
In order to meet the application demand for informatization,intellectualization,real-time and visualization of the ammunition depot in troops,the paper proposes a real-time monitoring project based on the Internet of Things and visualization technology. In the project,with the backing of data acquisition,transmission,storage,analysis and display in cloud architecture and full use of Zig Bee,a new wireless sensor network,a real-time visual monitoring system,which can be run on multiple platforms,is constructed through synthetic analysis of the actual monitoring requirements and the application characteristics. The paper elaborates the architecture,the function-constructing project and3 D visual platform of the monitoring system and makes an exploratory study of the real-time monitoring.
This paper studies the common problem of interference between lightning rod and launch space in the engineering design of the surface-to-air missile launcher position, establishes the mathematical model about the position and height of lightning rod, then carries out the simulation analysis and compares the three kinds of design scheme,lastly adopts the design scheme of signal active lightning rod. The design scheme effectively solves the problem of protecting the surface-to-air missile position from the direct stroke lightning in the engineering design, and it is of great significance to improve the all-weather combat capability in the thunderstorm conditions.
By k-best detection algorithm analysis,studied the lattice reduction in basis (Lattice Reduction,LR) principle,combined with comparison to the MMSE-SIC detection algorithm based on the LR verified after pretreatment LR channel matrix ,the signal detection performance can be nearly 6-dB increased,whereby in the 8 * 8 multi-antenna system proposed SR-k-best detection algorithm based on LR. Through simulation comparison,the complexity of the detection algorithm lower detection performance decrease is negligible,which is a low-complexity near-optimal order MIMO detection algorithm.
In view of the problems of falling point probability calculating difficultly of the failure missile in flight test,five failure modes are put forward by fault analysis for subsystems of failure missile,a probability calculating model of probability distribution based on series system principles is built,Then the simulation model is built by analyzing the phases for launch,flight and falling. Finally,The falling point distribution for failure missile is given by using Monte Carlo method.
A method based on Vague set for the problem of target priority of Land-Based Air Defence Weapon Systems is proposed. Firstly,the qualitative and quantitative indexes that affect target priority are analyzed and confirmed,and a decision-making matrix is established based on Vague set. Then,this paper principally studies the way to calculate the weights of the indexes by making the Vague distance maximum. Finally,the target priority algorithm is given according to the overall similarity degree. The application example is given and the results validated the applicability an effectiveness of this method.
Scientific evaluation of hybrid attribute target value is the core of armored brigade combat decision-making basis. To improve the armored brigade weapon platform auxiliary decision-making level , armored brigade target value evaluation method is proposed ,and a hybrid multiple attribute projection algorithm evaluation model is established. Example analysis shows that the PA can assess the targets value effectively ,and it can provide data for commander comprehensively and scientifically decision-making support.
Though spatial power combining technology is widely used,the combining efficiency is affected by signal's amplitude difference,phase difference and element number. This article analyzes normal distributed amplitude difference and phase difference's influence to theory spatial power combining. It analyzes the average combining efficiency expression of spatial power combining and shows that the amplitude and phase difference influence varies directly with the number of spatial power combining system's array element. But as the difference of amplitude and phase is little, combining efficiency tends to a stable value even if array element number increases. The conclusion is got that the most effective method to increase system power gain is to increase array element number.
