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合成孔径雷达图像及迷彩技术研究 总被引:2,自引:1,他引:1
从合成孔径雷达(SAR)成像的原理出发,围绕4种地物散射模式,给出了不同雷达波段对应的表面粗糙度范围.结合军事工程的SAR图像解译,提出了SAR图像的变形迷彩处理技术,重点研究了道路的反识别迷彩处理方法.对照国内外雷达后向散射系数σ0的实验数据,提出了工程伪装新材料的技术要求,指出了开发该类材料的研制途径,研究结果为SAR图像伪装防护研究及军事工程伪装新材料研制提供了理论依据. 相似文献
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毫米波合成孔径雷达(SAR:Synthetic Aperture Radar)成像技术是雷达技术、现代电子技术和数字信号处理技术的有机结合,使系统雷达的功能发生了质的飞跃.随着SAR成像处理技术的发展,其成像质量不断提高,成为当今高科技条件下一种不可取代的探测、侦察手段,在军事、经济和科学研究等方面都有重大价值和广泛应用前景.主要介绍了毫米波成像雷达与微波雷达相比具有的技术特点,较详细地讨论了毫米波合成孔径雷达的成像原理技术. 相似文献
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多通道合成孔径雷达(synthetic aperture radar,SAR)成像及空对自适应处理(space-time adaptive processing,STAP)是抗噪声干扰的有效途径.从deramping处理与CS( chirp scaling)算法出发,推导了应用于多通道SAR成像的DCS( deramping CS)算法及STAP方法.由于结合了deramping处理进行方位模糊抑制从而降低重频,因而从另一个方面降低了STAP的慢时间阶数.计算机仿真的结果验证了算法的有效性,同时还显示在噪声干扰严重破坏单通道SAR成像及多通道DCS的前提下,多通道STAP可以有效地抑制噪声干扰,保障成像质量. 相似文献
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调频连续波(FM-CW)合成孔径雷达因其体积小、重量轻、成本低及分辨率高等特点越来越受到关注。详细分析了去调频FM-CW SAR距离维成像过程,得到了FM-CW SAR残留视频相位在距离维傅立叶变换过程中被消除的有用结论;分析了影响距离维分辨率的因素,提出了改善FM-CW SAR距离分辨率,同时降低距离维采样率的方法。理论分析表明,去调频连续波SAR同样存在斜置现象,因此,还详细分析了FM-CW SAR斜置的产生以及去斜的方法,提出了包含去斜的距离维成像算法,为方位向更好的聚焦提供了条件。 相似文献
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相对固定的军力部署会提前暴露军事意图。为避免此种情况,美军在2018年《国防战略报告》中提出要实现作战的不可预见性。未来美军不可预见的动态军事力量部署一定程度上增加了军事斗争准备难度。为提升军队机场阵地战场生存能力,有必要针对性地调整应对策略,增强对抗“不可预见作战”的能力。本文着眼军用机场阵地,从三个方面分析对抗不可预见作战的伪装策略:首先阐述不可预见作战的特点,其次分析在“不可预见作战”条件下,现有机场阵地在伪装方面的短板,最后提出对抗“不可预见作战”的伪装策略。通过分析认为,为对抗美军新的作战构想,军事机场阵地伪装策略应从战时应用调整为平战结合,应更加侧重平时的伪装训练和伪装工程建设。 相似文献
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本文应用结构的敏感度分析法,以敏感区的频响函数作为观测特征量,建立了故障诊断的识别方程。利用Kalman 滤波迭代算法对某工程圆管进行了刚度型故障诊断的仿真计算和试验分析。结果表明振动诊断技术可用于工程结构故障的微机实时监控,具有精度较高,抗干扰能力较强的特点。 相似文献
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Joanna R.Hall Olivia Matthews Timothy N.Volonakis Eric Liggins Karl P.Lymer Roland Baddeley Innes C.Cuthill Nicholas E.Scott-Samuel 《防务技术》2021,17(6):1833-1839
The human visual system is still an important factor in military warfare; military personnel receive training on effective search strategies, and camouflage that can effectively conceal objects and personnel is a key component of a successful integrated survivability strategy. Previous methods of camouflage assessment have, amongst others, used psychophysics to generate distinctiveness metrics. However, the population from which the human observers are drawn is often not well defined, or necessarily appropriate. In this experiment we designed a new platform for testing multiple patterns based on a camouflaged object detection task, and investigate whether trained military observers perform better than civilians. We use a two-alternative forced choice paradigm, with participants searching images of woodland for a replica military helmet displaying Olive Green, Multi Terrain Pattern, US Marine Pattern or, as a conspicuous control, UN Peacekeeper Blue. Our data show that there is no difference in detection performance between the two observer groups but that there are clear differences in the effectiveness of the different helmet colour patterns in a temperate woodland environment. We conclude that when tasks involve very short stimulus presentation times, task-specific training has little effect on the success of target detection and thus this paradigm is particularly suitable for robust estimates of camouflage efficacy. 相似文献
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李决龙 《后勤工程学院学报》2008,24(4):1-5
以复杂大系统通用集成模型及其开发策略为理论基础,研究了大型地下工程智能化系统分层递阶、多级分区的框架结构方案及其特征,在此方案指导下,提出了4层递阶式广义智能化体系结构,构建了地下工程智能化系统的硬件模型、软件模型、通信模型、数据资源组织模型等,从而给出了大型地下工程智能化系统的总体技术方案,阐述了系统集成的实现方法,为促进防护工程智能化、信息化建设提供了技术参考。 相似文献
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In order to examine the possibility to improve its camouflage properties standard cotton fabric with camouflage print was impregnated with poly(vinyl butyral), PVB and fullerene-like nanoparticles of tungsten disulfide, PVB/IF-WS2. FTIR analysis excluded any possible chemical interaction of IF-WS2 with PVB and the fabric. The camouflage behavior of the impregnated fabric has been examined firstly in the VIS part of the spectrum. Diffuse reflection, specular gloss and color coordinates were measured for three different shades (black, brown and dark green). Thermal imaging was applied to examine the camouflage abilities of this impregnation in IR part of the spectrum. The obtained results show that PVB/IF-WS2 impregnation system induced enhacement of the materials camouflage properties, i.e. that IF-WS2 have a positive effect on spectrophotometric characteristics of the fabric. 相似文献
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The evaluation index of camouflage patterns is important in the field of military application. It is the goal that researchers have always pursued to make the computable evaluation indicators more in line with the human visual mechanism. In order to make the evaluation method more computationally intelligent, a Multi-Feature Camouflage Fused Index (MF-CFI) is proposed based on the comparison of grayscale, color and texture features between the target and the background. In order to verify the effectiveness of the proposed index, eye movement experiments are conducted to compare the proposed index with existing indexes including Universal Image Quality Index (UIQI), Camouflage Similarity Index (CSI) and Structural Similarity (SSIM). Twenty-four different simulated targets are designed in a grassland background, 28 observers participate in the experiment and record the eye movement data during the observation process. The results show that the highest Pearson correlation coefficient is observed between MF-CFI and the eye movement data, both in the designed digital camouflage patterns and large-spot camouflage patterns. Since MF-CFI is more in line with the detection law of camouflage targets in human visual perception, the proposed index can be used for the comparison and parameter optimization of camouflage design algorithms. 相似文献