共查询到20条相似文献,搜索用时 78 毫秒
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采用仿真技术进行统计模拟打靶是向军方提供对舰导弹向真实目标射击条件下单发命中概率的唯一途径。射击精确度仿真模型是进行统计模拟打靶的基础模型,为了保证统计模拟打靶与导弹实际射击过程之间的相似性,首要问题是应该利用导弹飞行试验结果对射击精确度仿真模型进行检验。本文一般介绍了射击精确度仿真模型及其检验问题,并对弹道仿真模型的检验进行重点讨论。利用从典型弹道和基准弹道仿真检验逐步过渡到实际弹道仿真检验的作法,可以完整地检验弹道仿真模型并满足射击精确度仿真的需要。 相似文献
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弹道交班自适应算法研究 总被引:1,自引:0,他引:1
为实现复合制导不同制导弹道的平滑过渡,用二阶吻合法设计了一不同制导律间的指令交接导引段。建立了自适应弹道交接导引算法的模型。理论分析和仿真结果表明,该算法具较好的弹道过载平滑能力,有一定的应用价值。 相似文献
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为提升固体运载器整体性能,提出一种姿控载荷多约束的内外弹道联合优化建模方法。首先,建立固体运载器内弹道计算模型和外弹道计算模型,给出大风区和级间分离的姿态控制模型以及杆状减阻装置载荷计算模型。其次,以灵敏度分析方法选择出内外弹道设计参数作为优化设计变量,将姿控摆角需求、减阻杆承载能力作为约束条件,建立以射程最优为目标的优化模型。最后,将该方法应用在某三级固体运载器的优化设计中,以差分进化算法开展仿真校验,射程提高了10.8%,并且优化结果满足姿控和载荷约束。 相似文献
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为研究导弹跟踪海面目标时的海杂波多径干扰,建立了用于数值仿真和半实物仿真的目标回波与海面杂波的多普勒频率及功率模型。理论仿真计算值与飞行试验数据的比较表明,所建的海面后向散射海杂波模型正确,可用于背景模型仿真。最后给出了一低空远界理论弹道主瓣杂波功率的仿真样例。 相似文献
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Joanne Irene Gabrynowicz 《Space Policy》1997,13(3):229-244
A ground-level view of Earth observations reveals that emerging ground segments are of at least two major categories: those that are satellite-driven and which have top-down organizations and those that are data-driven and organized from the bottom up. Or put differently, the former are generally data users. A ground-level perspective also suggests that continually rising scientific and economic value of data and decreasing national budgets require balancing satellite investment with effective ground segment evolution to provide demonstrable reasons to continue funding both satellites and ground activities. 相似文献
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The different acceleration components on the ISS that are responsible for the generation of convective motions in a fluid cell either in the presence of density gradients or in quasi-isodense processes, are analyzed. The NASA measurements of the quasi-steady and periodic acceleration on the ISS are considered and their effects on fluid-dynamic experiments are computed and discussed under different assumptions. In particular, numerical simulations are carried out to identify the relative importance of linear and pendular accelerations, due to possible rotations of the P/L around its center of mass. The effects caused by variable accelerations created by an isolation mount that exhibits an attenuation factor not constant within the payload volume, caused by the reaction forces of the umbilicals, are computed and analyzed. 相似文献
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The results of modeling the dynamics of the Space Radiotelescope are presented. The results of ground-based vibration-dynamic tests are used to validate the calculation models and estimate the damping levels. The dynamic distortions of the reflecting surface caused by the operation of the pointing mechanism of the high-gain antenna are estimated. 相似文献
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混沌码用作测控扩频码的可行性研究 总被引:2,自引:0,他引:2
阐述了混沌码的基本特性,提出用混沌码作为测控扩频码的构想,并讨论了混沌码扩频测控体系构成,以及体系中的关键技术,从而论证混沌码扩频测控体制的可行性,研究表明混沌码比传统扩频码有更强的保密和抗多址干扰特性。 相似文献
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Pletser V 《Acta Astronautica》1995,36(4):217-229
The role of man in space is investigated in the operation of the Advanced Fluid Physics Module (AFPM), a scientific instrument dedicated to fluid physics research in a microgravity environment and flown on the Spacelab D2 mission. The astronaut involvement is addressed by applying the criteria of the THURIS study, conducted by NASA for the optimization of future manned space flights. Outcomes of the THURIS study are first summarized. The AFPM characteristics and interfaces are briefly presented. The five experiments performed on board Spacelab D2 are introduced and the involvement of the astronaut is described. Finally, THURIS criteria are applied to an AFPM experiment scenario. Results show that, of all the activities involved in the AFPM nominal operation, two thirds are related to hardware manipulation and to procedure following, while the last third uses the unique astronaut intellectual capabilities, making his presence in orbit mandatory for successful experiment completion. 相似文献
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三角形激光陀螺谐振腔的精度分析 总被引:2,自引:1,他引:2
利用几何光学建立了三角形激光陀螺谐振腔反射镜微动引起腔内环形光路的变化方程,通过对光路偏移量的分离,导出由谐振腔加工误差造成的且经过调腔后的剩余偏移量,最后通过光路的剩余偏移量对激光陀螺性能影响的分析,计算出三角形激光陀螺谐振腔加工精度要求并对其特点进行了总结。 相似文献
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Post JM 《Space Policy》1989,5(2):99-102
In 1979 the author Tom Wolfe likened US astronauts to sacrificial gladiators characterized by competitiveness, independence, self-sufficiency, extroversion and a sense of moral righteousness and superiority--in short, 'the right stuff'. But are these the qualities needed for long-duration international missions? The author's hunch is that they are on the whole still necessary but not sufficient, but he emphasizes that systematic study of past behavioural reactions and analogous environments is needed if vital questions of interpersonal dynamics are to be answered correctly. 相似文献
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The results of an investigation of the distribution of plasma pressure, pressure gradients, and magnetic field near the equatorial plane in the plasma ring surrounding the Earth under magneto-quiet conditions are presented. Observational data obtained during the international THEMIS mission are used. The picture of the distribution of transverse-current density near the equatorial plane was obtained under assumption of observing the magnetostatic balance condition at geocentric distances from 6 to 12R E. In estimating the integral transverse current it was accepted that in daytime sector the magnetic-field minima on magnetic field lines are not localized in the equatorial plane. Estimates of the integral transverse current were obtained, which demonstrate the possibility of closing nighttime transverse currents at geocentric distances of up to ~12R E inside the magnetosphere, which form a high-latitudinal continuation of the ring current. 相似文献