共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
正交四元探测器是第3代红外导引头的核心传感器,为了对该型导引头实施有效干扰,探讨了其探测工作机理,有针对性地提出影响其自动增益控制(AGC)电路工作的干扰策略,对干扰实施过程进行了仿真分析。采用蒙特卡洛方法模拟了在干扰存在频差,干扰占空比改变,干扰相位变化条件下的平均有效干扰率。仿真结果表明:以同频或倍频、0.25占空比、较高功率激光可影响导引头AGC电路正常工作,适时通过调整干扰相位可以影响干扰效果,最终破坏其信号提取逻辑,实现欺骗干扰。分析结果对于激光定向红外对抗系统的研制具有一定理论指导意义。 相似文献
3.
4.
目前,制导武器系统导引性能评估主要采用室内仿真和实弹射击方法。但是,受模拟条件的限制,室内仿真存在目标瞬变作用机理描述不足及过程复现可信度低等难题;而外场实弹射击则存在试验样本量有限,目标环境设定单一且射击条件无法保证一致性的问题,难以全面考核出武器系统对环境和干扰的适应性。针对这一问题,提出了一种介于室内仿真与外场实弹试验之间的中间验证考核方法,在接近真实复杂战场环境条件下,构建了制导武器系统的可视化动态测试平台,获取导引头探测、识别和跟踪目标过程的同步、实时可视化观瞄图像,提取目标信息并实现导引性能评估。这种方法在靶场环境下针对实际靶标目标进行静态、动态跟踪试验,能够为激光、毫米波、电视以及红外等不同制导模式的导引头系统进行集成试验与测试,可为室内仿真提供目标背景的直接驱动数据,提升仿真逼真度; 同时,也可多次重复考核导引环节的关键能力,弥补实弹射击试验数量的不足,为武器系统研制过程提供了一种全新的测试验证手段 相似文献
5.
《中国光学与应用光学文摘》2004,(4)
对某型空地导弹电视导引头进行实测建模,通过建模和仿真分析,对系统提出改进意见。介绍了光纤图像制导系统的技术特点和基本原理,讨论了光纤图像制导的关键技术,如图像导引头、光纤双向传输系统、图像跟踪器等,给出了光纤制导系统应用的实例及试验结果,分析了其应用方向和发展前景。 相似文献
6.
7.
8.
激光制导、微波制导的导引头由于不具备可视化功能,在实际环境中进行性能考核时,导引头是否成功截获指定目标、截获目标后的稳定跟踪过程是否正常以及在稳定跟踪过程中出现的问题都不易得到及时、准确的定位和分析。文中设计的可视化评估系统可有效解决上述问题,通过加装可见光成像系统同步伴随导引头运动的方法,将导引头搜索、跟踪目标的过程清晰成像,直观显示导引头的整个工作过程,同时利用图像跟踪系统和图像存储系统保存关键性能参数,试验完成后对导引头的输出参数及跟踪性能进行验证及处理,进而对导引头的性能参数进行分析和评估;通过动态跟踪或加载干扰源试验验证,该方法能利用可视化系统可靠同步跟随不可视导引头的运动,并对导引头跟踪过程进行定性观察及定量分析。该方法不仅可以克服室内仿真环境不太真实的缺点,又可进行多次重复性研究,性价比高,为导引头性能评估提供一种比较适用的研究手段。 相似文献
9.
10.
红外隐身技术的应用及发展趋势 总被引:1,自引:0,他引:1
从斯忒藩-波尔兹曼定律出发,阐述了红外隐身的基本原理,分析得出实现红外隐身的几种方法。介绍了红外隐身材料的作用机理,指出了目前这些材料存在的主要问题,然后描述了红外隐身技术在军事上的具体应用和研究进展,总结了红外隐身技术的未来发展趋势。最后,指出今后的研究将主要在以下两方面展开:一是寻求全波段多隐身技术的兼容;二是对现有方法进行改进并探索新的红外隐身方法。 相似文献
11.
Ugeda MM Fernández-Torre D Brihuega I Pou P Martínez-Galera AJ Pérez R Gómez-Rodríguez JM 《Physical review letters》2011,107(11):116803
Understanding the coupling of graphene with its local environment is critical to be able to integrate it in tomorrow's electronic devices. Here we show how the presence of a metallic substrate affects the properties of an atomically tailored graphene layer. We have deliberately introduced single carbon vacancies on a graphene monolayer grown on a Pt(111) surface and investigated its impact in the electronic, structural, and magnetic properties of the graphene layer. Our low temperature scanning tunneling microscopy studies, complemented by density functional theory, show the existence of a broad electronic resonance above the Fermi energy associated with the vacancies. Vacancy sites become reactive leading to an increase of the coupling between the graphene layer and the metal substrate at these points; this gives rise to a rapid decay of the localized state and the quenching of the magnetic moment associated with carbon vacancies in freestanding graphene layers. 相似文献
12.
A. H. Taub 《General Relativity and Gravitation》1979,10(12):1009-1009
13.
14.
15.
In this note we use some of the results of [3] to derive a general duality theorem for the cohomologies of foliated structures on a manifold. The result is applied to the special case of a symplectic manifold M on which the foliation is given by a complex polarization F in the sense of geometric quantization. We obtain, for example, a rigorous proof of the fact that for a smooth function ƒ on M whose Hamiltonian vector field leaves F invariant, the spectrum of the corresponding prequantization operator v(ƒ) coincides with the spectrum of its transpose, under the above duality. This latter result was obtained by Simms in [12] under certain hypotheses. Proofs of the validity of those hypotheses are now available in the literature; cf. [3] and [7]. 相似文献
16.
17.
Valfells A. Verboncoeur J.P. Lau Y.Y. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》2000,28(3):529-536
Analyzes the effects of space charge shielding on the steady state of a multipactor discharge on a dielectric. Analytic methods are used to obtain an exact function for the potential in the discharge, assuming a Maxwellian distribution of emitted electrons. An equation for the amount of power deposited on the dielectric by the multipactoring electrons, for a given saturation level, is given. A simple method for obtaining the saturation level, for a given material, is obtained 相似文献
18.
We study the relation between the centro-affine geometry of star-shaped planar curves and the projective geometry of parametrized maps into RP1. We show that projectivization induces a map between differential invariants and a bi-Poisson map between Hamiltonian structures. We also show that a Hamiltonian evolution equation for closed star-shaped planar curves, discovered by Pinkall, has the Schwarzian KdV equation as its projectivization. (For both flows, the curvature evolves by the KdV equation.) Using algebro-geometric methods and the relation of group-based moving frames to AKNS-type representations, we construct examples of closed solutions of Pinkall’s flow associated with periodic finite-gap KdV potentials. 相似文献
19.
《Surface science》1986,171(1):103-110
Cl2 layers adsorbed on Grafoil have been investigated by X-ray diffraction between 78 and 285 K. Mono- and submonolayers crystallize in a parallelogram lauttce, incommensurate with the (001) graphite surfaces, the molecules oriented almost perpendicular to the surface. The structure is closely related to that of the (001) planes of three-dimensional solid chlorine. For coverages above the monolayer completion bulk crystalization sets in. 相似文献
20.
Kopeikin SM 《Physical review letters》2007,98(22):229001; discussion 229002