Abstract:Aimed at the problems that different function parts, such as the air space management part, air traffic service part, airflow management part and air traffic regulation part are isolated and the fusion of cooperation is not smooth under conditions of current air traffic control system of centralized architecture, a new air traffic control system architecture based on CPS is proposed, and the concept of routing aircraft swarm is produced and the related key technologies including the 4D trajectory ,rule extraction, and next generation data link are put forward. Its ability emergence mechanism such as information flow and time cost are analyzed, Then the characteristics and advantages of the given air traffic control system operating architecture are elaborated, and its rationality and availability are validated.

Abstract:Threedimensional finite element models of neatly fitted rivet lapjoint containing multiple site damage (MSD) cracks are developed and the concept of equivalent stress intensity factor (SIF) is introduced based on the calculation of different sides of the crack tip. On the basis of Paris formula, and combined with the improved loadcycles cumulate method, a prediction method for MSD crack growth under constant amplitude cyclic loading is established, and plastic zone linkup criterion and coherence treatment in MSD evolution are integrated. The results of calculation and experiment show that the prediction results are in good agreement with experimental results, the errors of three damage modes are within 7 percent; the analysis for lapjoint cannot be simplified into plate model, the crack growth life of MSD structure is highly conducted by the mode of damage, the more cracks exist, the faster the cracks grow.

Abstract:In order to correct the navigation error of midlong range airtoair missile in the inertial midcourse guidance, a method of command amendment inertial midcourse guidance is proposed by adopting a dual aircraft cooperation method. Firstly, a motion equation of midcourse guidance is established, the principle of dual aircraft cooperative detection to obtain the position information and the angle information of the missile are introduced, and a method of solving the navigation information for missile computer is given. Secondly, the system with command amendment for strapdown inertial navigation system (SINS) is designed, and a state equation and a quantity equation of the system are listed. Moreover, to solve the nonlinear problem of navigation system, the novel algorithm of Unscented Kalman Filter (UKF) is introduced. The simulation results show that the position method by dual aircraft cooperation can precisely calculate the navigation information of the missile in a certain range. The UKF algorithm is useful to solve the problem of navigation system, and the method of command amendment based on dual aircraft cooperation can correct the navigation error of SINS, and can also improve the precision of the midcourse guidance.

Abstract:Rotating Parachute Systems provide a stable platform for scanning equipment. Usually, it is difficult to meet all the needs of some elements such as: velocity of descent, rate of spin, and submunition inclination angle against vertical and dynamic stability. A 7degreeoffreedom dynamic model is developed for the convenience of analyzing the attitudes of the Rotating Parachute Systems. Compared with Euler method, the complicated restraint forces are avoided and the odds in simulating process are solved. The movement law of the parachutebomb system and the scan laws of sensitive implement are gained by an algorithm question. The results can be a theoretical reference for optional design of the parachuteload system.

Abstract:In view of the characteristics of dynamic, openness and complexity, this makes aerospace network high in security .To make full use of prior knowledge, the neural network theory should be used to build up a model of the trust. Through the establishment of acquaintance community, recommending trust value is obtained. Lastly, the problem of malice recommendation is solved by BP neural network with penalty. The model proposed in this paper provides a new way for studying behavior trust in Aerospace Network.

Abstract:Aimed at the problem that the channel of widerange AirtoGround communication is hard to be exactly described by adoting traditional model of channel, according to the height of flight platform, the Markov Process is utilized as exactly as possible to describe AirtoGround fading channel from the switch of the improved Rice model and Loo model. In the meantime, every model is divided into slight and heavy occlusion states, and the Markov Process is used to switch for the two different environment states according to special local environment. Getting rid of the ideal assumption that incident angles of arrival wave from multipath are submitted to uniform distribution in , then two relevant and real Gaussian models are constructed as a Rice process, the Rice model and Loo model are modified and optimized, the Doppler power spectrum and Amplitudephase Probability Density Function of the two models after modification are deduced. The simulation results show that the curve of Doppler power spectrum should be the unsymmetrical form after modification, the degree of freedom (DOF) and adaptability of the model are enhanced, the different influence to signal transmission in different channel states is distinctly depicted, and this can reflect the real conditions well.

Abstract:First, the principles of TDMA protocol and HFTP protocol are analyzed. Aimed at the features that fluctuations are fast and high frequency (HF) communication via skywave propagation is faded, a TPTDMA protocol based on TDMA protocol is designed combined with the advantages and disadvantages of two kinds of HF MAC protocol. A mathematical model of time delay is established by using queuing theory. The influence of different factors on the time delay is discussed by the analytical method. The results show that the TPTDMA protocol has more excellent performance than that of the TDMA protocol and HFTP protocol in the HF channel with the increase of the value of channel error rate, node number and traffic.

Abstract:Aimed at the problem of multiple relay selections in satelliteterrestrial cooperative system, a new relay selection scheme based on adaptive genetic algorithm(AGA) is proposed. The proposed scheme assigns one or many relay node models to a source node, and the scheme establishes an optimization model to assign one or more relays, and maximizes the received signaltonoise ratio(SNR) at the destination. The paper analyses the land mobile satellite system(LMS), and the receiver adopts an equalgain combining technique to implement a selective decode and forward (DF) between a source node (the satellite) and a destination node (a terrestrial station). The results show that the scheme based on AGA can improve powerefficiency and the received SNR of 8 dB, compared with the best single scheme under the condition that only one relay node with the maximum SNR is selected. And the proposed scheme can improve timeefficiency of 75%, compared with the exhaustive scheme.

Abstract:Based on the topology optimization and genetic algorithm (GA), a kind of metamaterial absorbers with wideband, polarizationinsensitive and lightweight is proposed and applied to radar cross section (RCS) reduction of antennas by using resistive frequency selective surface (RFSS). Specific absorption of absorbers in range of frequency band 6.3~20 GHz is greater than 90% and this can remain above 80% when the incident angle increases to 50°under conditions of TE and TM polarizationindependent. The absorber is loaded to the microstrip antenna with a cover plate form, and the reduction of antennas RCS is greater than 3 dBsm in range of frequency band 6.3~20 GHz, and is greater than 10 dBsm in range of frequency band 10.37~10.90 GHz under conditions that the original radiation characteristic of antennas is unchanged. As an application example of this absorber, a lowRCS microstrip patch antenna is designed by mounting the absorber on substrate of the antenna. The RFSS absorber is made of carbon films attached on lightweight foam. The area density is only 0.35 g/cm3. The microstrip antenna designed is low RCS, lightweight, and lowprofile, and such antennas possess importance application values in stealthy technologies.

Abstract:Aimed at the fact that data samples in the same data set are difficult to recognize because of maldistribution, this paper proposes a fast radar emitter recognition algorithm based on rough K-means combined with AdaBoost. The algorithm is composed of two stages. At the primary recognition stage， an improved rough kmeans algorithm is proposed, and the data feature space is divided into the certain area, the rough area and the uncertain area to construct a fast radar emitter recognition algorithm model so as to filter and recognize the data set. And at the same time a heuristic approach is proposed to solve the inherent shortcomings of the original rough K-means by ascertaining its initial clustering number and centers. And at the advanced recognition stage, unknown samples dwelling in the uncertain area are recognized by the multiclass AdaBoost classifier trained by the unknown ones in the rough area, thus promoting the recognition accuracy of the algorithm. The simulation results show that compared to RBFSVM and AdaBoost, the scope of an accuracy fluctuation is from -0.1% to +1.4%, the shrinkage of a training time is 0.857 s, and the shrinkage of a test time is 0.005 s at most, and apparently the computational complexity is lowered and the time consumed is shortened respectively by using this new algorithm under conditions of reserving comparatively high recognition accuracy and generalization capability. By so doing, this provides fast radar emitter recognition algorithmsdesigning with new train of thought.

Abstract:In order to improve the antijamming ability of radar and synthesize the most effective antijamming measures in accordance with, a jamming recognition method is proposed based on SPWVD features analyzed. In this method, SPWVD distribution of received radar signal is given firstly, and feature extraction of radar active deception jamming by separating degree in timefreqency domain and Renyi entropy is put forward based on its distribution difference. Finally, these two features are used in jamming recognition. The simulation results show that the technique is effective and stable in recognizing active deception jamming signal. And by doing so this provides the selections of followup antijamming measures with a priori information.

Abstract:In order to improve the direction of arrival (DOA) estimation capability and accuracy on condition of low signaltonoise ratio, a new conical multilayer uniform circular array is designed based on cylindrical multilayer uniform circular array. The array elements on the element of cone are equivalent to a uniform linear array, and the linear array received data constitute a new array manifold matrix. Compared these two kinds of array manifold CramerRao bound (CRB), the result shows that on conditions of low signaltonoise ratio and high elevation， the new array can get higher estimation accuracy and the probability of success relative to cylindrical multilayer uniform circular array. In the simulation, the superiority of the array in the multisource is verified by using the algorithm of the twodimensional multiple signal classification (2D MUSIC) on conditions of low SNR and high elevation, and the effect of the spatial angle on the performance of the array DOA estimation is given.

Abstract:In order to solve the problem that a single LMS filter is restricted by mutual influence at convergence speed and stable state error to lead to the performance decrease of the recognition system,the convex combination of leastmeansquare algorithm is employed in this paper by paralleling use of a fast and a slow LMS filter. To further improve the algorithm's capability, a new lowcomplexity convex combination of CLMS algorithm is proposed by improving the traditional CLMS. The proposed algorithm simplifies and improves the renewal iterative formula of parameters' sum by using modified arc tangent function and sign function respectively. Meanwhile the paper employs an instantaneous transfer scheme combined with the window length of to accelerate the convergence rate. Theoretical analysis and simulation results suggest that under the conditions of the influence of noise, relative signal input and unstable environment, the proposed algorithm can not only maintain a superior capability of tracking and mean square, but also possess a higher convergence rate.

Abstract:Aimed at the disadvantages of traditional threshold function in image denoising and the uncertainty of the threshold selection, a new improved threshold function algorithm in image denoising is proposed so as to further research on wavelet denoising algorithm. Matlab simulation of Circuit, Eight, and Road images are performed respectively by adopting the traditional hard threshold, the soft threshold, and the semisoft threshold method combined with this paper method. Through contrast and analysis, this method is good in visual effects and high in Peak Signal to Noise Ratio (PSNR). And at the same time, the signal distortion is solved in the soft threshold method, and the signal discontinuity and oscillation shortcomings in the hard threshold method are overcome as well. Moreover, the method can strike a good balance between noise elimination, and can also retain the weak features of the original signal and significantly address many problems in the traditional hard and soft threshold function denoising algorithms. This method is good in effectiveness in practical applications.

Abstract:In the light of the problems that at present in the main stream algorithms the integral regression method is still applied to all the feature points whereas the local structure information of human face is ignored, a novel cascaded regression structure is presented based on relative distance distribution and K-means clustering combined with face structure information on clustering facial landmarks and performing regression for each part respectively, the feature points locating of human face can be performed more accurately. In addition, the regression method is optimized to make robust parameter updated with efficiency. The paper carries out a thorough experiment on a face database (COFW) with block identification. The experiments demonstrate that the algorithm is notable in effect with regard to the application of feature points of a human face to the location, and the algorithm is greatly short in training time compared with Robust Cascaded Pose Regression and other stateoftheart methods and the testing speed is up to 220 fps, thus realizing realtime processing.

Abstract:Aimed at the difficulty of selecting parameters in bistable stochastic resonance system, based on the RungeKutta algorithm, a system parameters adjustment method is put forward in taking the fixed potential barrier height as conditions of constraint in this paper. First, according to the formula of output signal's SNR, the constraint conditions of parameters a,b are obtained. Then, the value of a is rapidly searched under conditions of constraint, thus making the output spectrum amplitude increased again. Finally, the maximum SNR of the output signal corresponding to the input signal can be obtained. The simulation results show that this method can effectively suppress the low frequency interference signals in detecting high frequency weak signals, and the output signal's SNR is increased by on average compared to that of traditional methods with no constraint conditions.

Abstract:In order to solve the problems of adaptive optimization for resource layer of command and control organizationmission planning，this paper proposes a model and an algorithm of adaptive optimization of mission planning under cost of changing tasks project. Aimed at the shortest mission completion time under cost of changing project constraint, the paper introduces the achievements in scientific research of scholars at home and abroad about adaptive optimization for mission planning and adaptive measures, analyzes the necessity and measurement of the cost of changing project, defines the cost of changing project, presents the constraint, and establishes a mathematical model. The paper designs a multidimensional dynamic list scheduling and circulative genetic algorithm to solve the model. By so doing, these are advantageous to commanders in balancing the property with the price of changing project and making a decision. The experimental result shows that the validity and the applicability are verified for the algorithms.

Abstract:On the basis of the presented two new concepts of trisingular equivalence class and trisingular set a new approach based on the rough set for horizontal decomposition of inconsistent decision tables is proposed. The new approach, just as the existing approach does, can decompose an inconsistent decision table into two decision tables, i.e., a consistent decision table and a complete inconsistent decision table. But the consistent decision table decomposed may be greater than that obtained by using the existing approach, thus causing less information loss. It is noteworthy that the new approach may be used to decompose parts of complete inconsistent decision tables, whereas complete decision tables can not be done by using the existing approach.

Abstract:Aiming at the problem that eddy current signal was easily disturbed by the excitation magnetic field and background magnetic noise, the method of PECT based on ferromagnetic shielding was proposed. The finite element simulation model with ferromagnetic shielding was established on the base of the theoretical analysis of magnetic shielding. The simulation result showed that the component of eddy current became intensive under the ferromagnetic shielding, although it weakened the amplitude of the testing signal. The defects of different depth can be easily recognized and the sensitivity of signal is effectively improved. According to the results of finite element simulation,the magnetic shield of ferromagnetic materialis manufactured. The experimental result indicates that magnetic shielding can effectively enhance the sensitivity of testing on the surface defects of ferromagnetic metal, whereas the method cannot improve the detection effect on the subsurface defects of ferromagnetic metal.

Abstract:In order to explore the solidification effect of the new type of 4 # powder solidified agent developed by Chang'an University, the article focuses on the silt clay at Dingxiang County, Xinzhou, Shanxi and the preparation of the soil samples mixed only the new type of 4 # powder solidified agent developed by Chang'an University. Then the article conducts the unconfined compression strength test of different proportion and different maintenance period with soaking or nonsoaking respectively, and the influence regularity of different proportion and different age mechanical properties are analyzed. The experimental results show that the increase of the strength of solidifiedsoil increases with the proportion and then becomes slow in the early stage of the maintenance, and the growth trend is opposite in the late maintenance; The increase of the strength of low proportion solidifiedsoil increases with the maintenance period and then becomes slow, and the growth trend is opposite with high proportion. On the basis of considering the intensity effects of different proportion and different age, the strength prediction formula in accordance with the soil mechanics properties of solidified soil is established, and it is useful for the solidified agent in the engineering practice to carry out the exploration of the strength guarantee theory and experimental study.