Study on the Anti-infrared Performance of Liquid Smoke Composition

In the technical field of reconnaissance, target location, target tracking and arms technology, IR sensors are increasingly used for making the entire battlefield transparent up to far into the opponents′ area.     

Real-time Extraction of Target Position Information Based on Bi-orthogonal Wavelets

Extraction of flying target position information is the prerequisite for passive infrared guided missiles to track the target. The existing missile detection system senses the target＇ s infrared radiation, and then the generated signal is sent to signal processing circuits for extracting the target position information. In order to improve anti-interference capacity of the detection system, an algorithm of module maximum edge detection based on the bi-orthogonal wavelets is proposed to replace its hardware. The signal can be decomposed in one layer, only its high frequency detail is reconstructed. After some calculations, the average target position can be obtained. The algorithm＇s real-time implementation with DSP is also discussed. To reduce the execution time, the program structure can be optimized with double buffers in memory. This im- plementation is verified by simulations. The results show that the method has only a small amount of calculations, can meet the requirements for finding out the target position in real-time and needs not the traditional processing circuit.     

Experimental Investigation on the Ballistic Resistace of Metal Plates Subjected to Impact of Rigid Projectiles

The ballistic performance of monolithic and multi-layered steel plates impacted by ogival-nosed projectiles was investigated by using a gas gun experimentally.The total thickness of in-contact multi-layered target was equally to that of monolithic target.The results show that,for the high strength targets,the monolithic targets have greater ballistic limit velocities than multi-layered targets,and also the ballistic limit velocities of targets decrease with the increase of the number of layers.However,for the low strength targets,the monolithic targets have lower ballistic limit velocities than multi-layered targets.The differences in target capacity between various impact conditions can be related to the transitions of perforation mechanisms and failure models.     

A Classification Algorithm for Ground Moving Targets Based on Magnetic Sensors

A novel classification algorithm based on abnormal magnetic signals is proposed for ground moving targets which are made of ferromagnetic material. According to the effect of diverse targets on earth's magnetism,the moving targets are detected by a magnetic sensor and classified with a simple computation method. The detection sensor is used for collecting a disturbance signal of earth magnetic field from an undetermined target. An optimum category match pattern of target signature is tested by training some statistical samples and designing a classification machine. Three ordinary targets are researched in the paper. The experimental results show that the algorithm has a low computation cost and a better sorting accuracy. This classification method can be applied to ground reconnaissance and target intrusion detection.     

Improvement of Intercept Probability Algorithm for Anti-ship Missile Based on Search Theory

Traditional intercept probability model has some drawbacks and can not meet the demands of command and control system. Aiming at this problem, a new calculation method based on search theory, terminal control area distribution function of anti-ship missile, target distribution function and missile's radar scan feature is proposed. Under the condition of common target distribution, an intercept probability model for present point attacking is determined. The simulation verifies its effectiveness and establishes the selecting model for aiming point when enemy ships evade in high speed.     

Analysis on Spiral Search Pattern for Moving Target

The distribution function of the target moving in constant velocity and linear course and its meeting condition to the searcher are analyzed.Another proof method for spiral search pattern is presented and the mathematic model of the target possible position is established when performing the linear search.Base on them,the wrong idea about the spiral search pattern can be avoided.     

Studies on the High Resolution DOA Estimation for UUV Based on Synthetic Aperture Technique

To increase the limited spatial processing gain of physical aperture of UUV （unmanned underwater vehicle） linear array and satisfy the demand of long distance target detection, a flank array based on the synthetic aperture technique is introduced into UUV, and a modified beam domain passive synthetic aperture processing algorithm （BDPSA） suitable for the flank array is proposed concurrently, which sums the beamforming of linear array coherently for successive measurement after phase compensation to make the beam output peak corresponding to the expected target bearing, expand the array aperture effectively and improve the resolution. The simulation of detection probability and distinguishing probability for double targets within 1, 1/2, 1/3 and 1/4 beam-width shows that the method of BDPSA has lower SNR threshold for target distinguishing, improves the detection probability and distinguishing probability under low SNR, and realizes the long-distance and high resolution bearing estimation because of the obvious improvement of the spatial array gain.     

Vibration Severity Monitoring and Evaluation of Armored Vehicle Transmission

Vibration monitoring and vibration severity evaluation of armored vehicle transmission are realized by additional sensors. An algorithm of vibration severity in frequency domain is presented. The algorithm has powerful applicability for signal type and flexible selectivity for frequency range, and avoids the processing of signal conversion used calculus and filtering compared to the algorithm of vibration severity in time domain. An applied example is given in company with attentive proceedings and measures for improving evaluation effect.     

Scale-up synthesis and characterization of 2,6-diamino-3,5-dinitropyrazine- 1-oxide

2,6-diamino-3,5-dinitropyrazine-1-oxide （ANPZO）, as an insensitive high explosive, with a high yield and excellent purity has been prepared at pilot plant scale by an improved method. The synthesized ANPZO is characterized by IR, laser granularity measurement, SEM and HPLC. The particle analysis revealed that the improved method could offer desired product with average particle size of 40 gm and high purity （〉98.45%）. The experimental parameters exhibited that the detonation velocity of the formulation based on ANPZO was higher than that of the corresponding TATB formulation. The DSC curve showed that the exothermic decomposition of the product occurred at the temperature between 300.5℃ and 360.4℃. Furthermore, the sensitivity test suggests its safe nature towards mechanical stimulus.     

Automotive Interior Noise Reduction in High Frequency Using Statistical Energy Analysis

Statistical energy analysis （SEA） is an effective method for predicting high frequency vibro-acoustic performance of automobiles. A full vehicle SEA model is presented for interior noise reduction. It is composed of a number of subsys- tems based on a 3D model with all parameters for each subsystem. The excitation inputs are measured through road tests in different conditions, including inputs from the engine vibration and the sound pressure of the engine bay. The accuracy in high frequency of SEA model is validated, by comparing the analysis results with the testing pressure level data at driv- er＇s right ear. Noise contribution and sensitivity of key subsystems are analyzed. Finally, the effectiveness of noise reduction is verified. Based on the SEA model, an approach combining test and simulation is proposed for the noise vibra- tion and harshness （NVH） design in vehicle development. It contains building the SEA model, testing for subsystem parameter identification, validating the simulation model, identifying subsystem power inputs, analyzing the design sensi- tivity. An example is given to demonstrate the interior noise reduction in high frequency.     

烟幕对红外成像探测干扰作用研究

红外热成像探测、制导技术在现代战争中占有重要地位。通过对红外热像仪的探测原理及烟幕对红外热像探测的干扰机理研究,探讨了冷烟幕和热烟幕对红外热像仪的干扰原理。烟幕箱实验表明,红外热像的探测能力随红外烟幕质量浓度的增加而降低。冷烟幕主要是通过烟幕粒子的吸收和散射作用干扰热像仪;而热烟幕除了具有吸收和散射作用外,还通过烟幕自身发射比目标强得多的红外辐射来屏蔽热像仪,从而起到干扰作用。理论分析与实验结果具有较好的一致性。     

真空中石墨微粉烟幕的红外消光性能研究

基于外层空间高真空的特点,为研究红外干扰材料在外层空间的适用性,实验研究了真空中石墨微粉烟幕的红外消光性能,并与常压下石墨微粉烟幕消光性能进行了比较.结果表明,石墨微粉烟幕在真空度0.03MPa的环境中具有良好的红外消光性能,但弱于常压下的消光能力.分析表明,当真空度较高时,烟幕微粒的沉积速率加快,烟幕有效质量浓度及微粒数浓度减小,烟幕消光性能降低.     

聚合物在赤磷基抗红外发烟剂中的研究

在实验室条件下利用多波段红外辐射仪，对含不同聚合物的赤磷基发烟剂燃烧产生的烟雾对远红外辐射的透过率进行测试。试验表明：不同聚合物在发烟剂中所起作用不同，相似成分的发烟剂中加入氟可降低烟雾在远红外波段的透过率。井分析了上述烟雾在红外波段产生不同遮蔽效果的原因。     

空空导弹红外成像导引头点源探测距离研究

分析和推导了红外成像导引头用于探测点源目标时探测距离的评价参数,并比较不同测试参数的优缺点。从分析点源目标的特性出发,分别推导出NEFD和NETD与探测距离的关系模型。最后,给出适合测试和评价红外成像导引头的参数。     

弹用红外干扰发烟剂研制

对铜基红外干扰发烟剂的配方及影响配方性能的主要因素进行了实验研究，并对其性能进行了测试。结果表明，该发烟剂不仅对中、远红外光具有优良的干扰能力，而且对可见光、激光也具有良好的遮蔽能力。该发烟剂还具有装填密度大，不导电，耐高、低温性能、相容性和稳定性能良好等特点。     

气凝胶基复合含能材料的制备及其红外遮蔽性能研究

为研究以二氧化硅气凝胶颗粒材料为骨架的复合型抗红外烟幕的制备及其红外波段遮蔽性能,分别将硝化棉、硝酸钠充填到气凝胶内部孔道中制备出气凝胶/NC、气凝胶/NaNO_3两种复合材料,将其掺杂到常规发烟剂中制备几组复合发烟剂,并对发烟剂红外遮蔽性能进行了研究。研究结果表明:掺杂气凝胶/NC复合材料的发烟剂所形成的烟幕对红外具有明显的遮蔽效果,8~14μm波段红外透过率低至3.37%;当气凝胶复合材料的掺杂量为7%时,烟幕对红外的干扰效果最佳。     

红外烟幕干扰材料在弹中的相容性

研究了红外烟幕干扰材料与弹中的红磷、漆的相容性，采用示差扫描热分析法（DSC）对各组分及其混合物进行测定，分析从室温到发生全分解反应过程中的热行为，根据GJB722A-97的相容性评价方法，对红外烟幕干扰材料与红磷、漆的相容性进行判定。结果表明：干扰材料与红磷、漆具有良好的相容性，可在弹壳中长期贮存。     

基于角度观测关联对的NN-EKF红外/毫米波融合跟踪算法

针对双传感器杂波环境中单目标的跟踪问题,提出了一种红外/毫米波角度观测关联及基于观测对最近邻的双模融合跟踪算法。算法根据对真实目标的观测与对杂波的虚假观测联合分布模型的不同,筛选出当前时刻的嫌疑观测对,剔除掉大部分杂波;然后对各嫌疑观测对进行融合,从中选择距离预测位置最近的观测作为当前时刻的观测,并用EKF对目标进行跟踪。算法关联逻辑简明、运算量小,适合工程应用,可应用在中等杂波密度环境,仿真结果验证了算法的有效性。     

基于红外遮蔽的地面烟幕防空阵地部署模型研究

现代防空作战中,本着及时响应、快速反应、发挥烟幕最大遮蔽效能的原则,发烟装备必须实现预先阵地配置。将解析几何分析和数值分析算法应用于阵地部署模型的研究：基于三维战场空间和烟幕需求,通过解析几何分析构建了垂直烟幕空间尺度计算模型;基于烟幕扩散模式——高斯烟羽模式,应用数学推导、牛顿下山法构建了单点施放垂直烟幕计算模型。以单点施放烟幕为构成单元,以空间烟幕需求为最终标准,综合建立了多点施放垂直烟幕计算模型,即防御红外制导武器的地面发烟装备阵地部署模型。结合试验对比分析表明：模型计算结果与试验数据一致性较好,构建的模型是合理可行的。     

草酸铵对赤磷发烟剂发烟量的改善

用草酸铵对含氧化剂和不含氧化剂的赤磷发烟剂进行了发烟量改善试验研究。结果表明，草酸铵能显著提高赤磷发烟剂的发烟量，尤其是对不含氧化剂的赤磷发烟剂；当草酸铵的加入量达到最佳值时，其发烟量与黄磷的发烟量几乎接近。