Abstract: Propagation of a collimated,pulsed laser Gaussian beam in an absorbing medium has been investigated theoreticallyThe energy absorbed by the medium of the propagation path causes heating,leading to an index of refraction change that causes self-defocusing,which induces thermal bloomingThermal-blooming effects can limit the laser power that can be effectively propagated through the atmosphereNumerical results for pulsed laser Gaussian beams are presented in form of irradiance profiles as functions of rangeThe pulse time is of the order of the hydrodynamic time,ie,the time required for a signal traveling at the sonic velocity to cross the beamThe long laser pulse is subjected to thermal blooming more than the short laser pulse,which is mainly subjected to the linear absorptionAn initial Gaussian beam distribution is deformed into the dimple near the center with the peak irradiance near the edge of the beamFinally,an approach adopting repetitively pulsed laser with optimized intervals between pulses is put forward,by which high average power can be transmitted

Abstract: The reasons of five error sources including vertical axis,horizontal axis,sight line coder,TV undershooting value which can result in TV tracking system errors are analyzedThe way to select the error and relative formula are discussed,the relation among errors of azimuth and elevation and system accuracy is presentedThe test results have shown that the system accuracy can meet the design requirements and the error analysis correctness was proved

Abstract: In view of some characteristics of digital image,a new method of floating-point operation is implemented on a ordinary FPGA chip.On the basis of the characteristic of digital image that the coordinate and the gray level of pixel are positive integer,the fixed-point multiplication,addition/subtraction operations and shift operation which are much easier to be implemented are used to complete floating-point operation.This method of floating-point operation can get over the inadequacy of complex structure,long delay period,hard to assure the real-time processing.This floating-point algorithm is applied successfully to a system for real-time canceling image rotation on basis of that the center processor is XC2S200-5PQ208,and it is emulated with ModelSim SE.The experimental results show that the method has advantages of simplicity,high speed and precision adjustable and it is suit to real-time image processing.

Abstract: A measure equipment of multi-optical axis parallelism was introduced.The error origin of measure equipment was analyzed,which including error about diffraction limit leaded by collimator,aberration of collimator,repetitive position precision of guide rail,and calculation error about the center of mass position of laser facula etc.All kinds of errors are measured or estimated in the test.Finally,measure precision of measure equipment is obtained.

Abstract: A large number of background noise are brought to underwater laser image for the reasons of absorption and scattering of water.The mathematical morphology can be used to process the results to clear the noise and extract the targets.The experiment results show that it can improve the resolution and SNR and the quantity of underwater laser image.

Abstract: In the traditional template-matching algorithm,complicated calculations cause a slow matching speed.Though the Sequential Similarity Detection Algorithms(SSDA) may reduce the calculations,it is difficult to select appropriate threshold.An algorithm for images matching is proposed based on SSDA with adaptive threshold in this paper.The initial threshold is set as the sum of color differences of matching regions on the first location.The threshold is updated adaptively when the difference is lower than the current threshold on latter matching location.The calculations are stopped while the difference of a location exceeding the current threshold,the best matching position can be found corresponding to the least difference over whole image.The algorithm can not only get matching position accurately between overlapping images,but also reduce the calculations.The experimental results are satisfactory.

Abstract: Based on distortion pattern painting camouflage technique,combined with human visual principle,some basic theories,such as the modern mathematics and digital image processing etc,were applied.A new scientific method for designing distortion pattern painting was presented to avoid the error produced by subjective factors

Abstract: A computing method with computer for the Fresnel diffraction of rectangular aperture is proposed.By transforming the integral of the Fresnel diffraction,the formula of the Fresnel diffraction for rectangular aperture is expressed by the Fresnel integral.Combining the virtue of the MATLAB and MAPLE,we use MAPLE integral order in the MATLAB language to carry out the numerical computing of the Fresnel diffraction and present the result of the numerical computing.This method is applied to compute the Fresnel diffraction of the single slot and half plane.

Abstract: Multisensor data fusion models mainly contain function models,architecture models and mathematical models.The effects and benefits of multisensor mata fusion in an electro-optic information system are discussed.The characters of electro-optic sensors are analyzed.Data fusion function models and architecture models in an electro-optic information system are built.Target state estimation based on Kalman filters and application of an expert system based on certain theory method used in target identification are studied.

Abstract: Through the analysis of the atmosphere laser scattering signal,the relation curve between the off-axis distance and scattering maximum radiation degree is provided.Based on the calculation analysis,by the two elements coherent detection technology,the detection threshold is further reduced,the scattering interception capability is improved and the warning field of laser warning receiver is increased.

Abstract: One enhanced method is introduced for infrared imageBorrowing ideas from the principles of visible light image,this method is adopted to aim at the wide dynamic range of infrared imageBased on the theory of Retinex,the multi-scale Retinex(MSR) algorithm is employed to remove the weather degradation of infrared image,and the contrast of the image is enhancedFor the intensity of the MSR processing output is weak,one normal clipped stretching method is deployed to improve the output brightnessThe simulation demonstrate that the normal clipped stretching MSR can improve effectively both of the contrast and the lightness,and quite satisfying visual effects have been achieved

Abstract: The spatial frequency of the digital hologram is analyzed with plane reference wave,and the separation conditions of its spatial spectrums are derived by ranking the spatial frequency in the CCD frequency domain.It shows that the incident angle is larger than the classic holography with the plane reference wave.The recording capability of the CCD is obtained by looking the digital hologram as an image system.

Abstract: The current situation of the early warning IR detection systems of foreign armies is presented.Considering the various kinds of applied areas,the basic components and the technical indexes of some early warning IR detection systems which are loaded on space based,airborne,sea based and land based platforms are introduced.In the end,the future developments is prospected.

Abstract: With a series of engineering activities of reliability,such as anticipation,assign,analysis and improvement etc,reliability technology is associated with the product design.The basic principle of electronics equipments reliability design is explained,including the selection and use of parts of apparatus,simplifying and circuit protection,hot design,environment test design,machinery construction design,test and maintain design etc.

Abstract: Software test is the key factor for guaranteeing the software quality,and unit test is the important part in the process of the software development and the basis for the other tests.The unit test methods are described specially,and the technology application for these methods is introduced with the practical situation.

Abstract: Considering the disadvantage of 3rd-generation image intensifier which is short of ultra-violet-light,based on image fusion,a new color night vision system project is designed.Lots of preprocess algorithms and image fusion algorithms of color night vision image are studied.Based on well analyzing the emulation results of software and the image processing hardware platform of DM642EVM board,the color night vision image system makes real-time image process.

Abstract: The construction distinguishing model based on the Mahalanobis distance is built in order to evaluate the adaptability of normal camouflage material and equipment with the environment.The model may be implemented to evaluate synthetically the camouflage material and equipment.The model has some merits such as more accurate and easier to operate.

Abstract: The color,shape and texture feature of the image are introduced.And the image similarity on the basis of these features is calculated,the image similarity is and used to evaluate camouflage effectiveness,which can make the criteria of camouflage evaluation more objective.

Abstract: Fiber coupler is a directional coupler that is crucial component for optical fiber communication systems.Although present applications of fiber coupler mostly interfere in linear characteristics,its nonlinear effect has been already investigated since 1982.However,all optical switching is very important application in its nonlinear effect.The basic structure and work principle of fiber coupler are introduced.The analysis of its linear and nonlinear theory is done.Several coupler applications are presented finally.

Abstract: IR thermal image decoy are widely concerned by many armies in the world for its unique military value.In the melting process at different conditions, such as different thickness,different environment temperature and different dosage,the lasting time of different phase change materials near phase change temperature was tested.The technical application of phase change materials in IR thermal imaging decoy was analyzed,and the feasibility was validated.

Abstract: The sequential similarity detection algorithm(SSDA) is studied to improve the conventional image matching,which is an efficient image matching algorithm.A threshold is given in the algorithm,which means the upper bound of distance between the template and the corresponding window in the image.A speed-up algorithm is proposed.The lower bound of distance between the template and the corresponding window is calculated and if the value exceeds the threshold,this window can be skipped.Experiments show that the proposed algorithm has a improvement in the speed compared to SSDA.

Abstract: The design of reducing the RCS of the shape of the target is the important way to enhance the stealth capability of the terrestrial vehicle on the war field.The design principle for reducing the terrestrial vehicle RCS is discussed,and the tests were carried out.The results showed that the low RCS shaping design has an obvious improvement to the radar stealth.