深空干涉测量天线G/T值指标设计

G/T是天线的一项重要技术指标,在综合考虑测地VLBI(Very Long Baseline Interferometry,甚长基线干涉测量)和航天器VLBI观测两者需求的基础上,提出了深空干涉测量天线的G/T指标设计方法.首先根据射电源的空间分布以及流量密度特性,确定了测地VLBI和航天器VLBI观测模式下射电源流量密度的要求.在此基础上建立了2种观测模式下时延误差与深空干涉测量天线G/T之间的关系模型.最后参考目前国际国内测地VLBI观测中的通用参数设置以及月球探测任务中航天器VLBI观测的参数设置,对不同观测任务、不同观测模式下的G/T要求进行仿真分析.综合测地VLBI和航天器VLBI观测仿真分析的结果,S频段G/T建议不小于32 dB/K,X频段G/T建议不小于43 dB/K.仿真分析结果可以作为后续深空干涉测量天线G/T设计的参考.     

基于分支深度强化学习的非合作目标追逃博弈策略求解

为解决航天器与非合作目标的空间交会问题,缓解深度强化学习在连续空间的应用限制,提出了一种基于分支深度强化学习的追逃博弈算法,以获得与非合作目标的空间交会策略。对于非合作目标的空间交会最优控制,运用微分对策描述为连续推力作用下的追逃博弈问题;为避免传统深度强化学习应对连续空间存在维数灾难问题,通过构建模糊推理模型来表征连续空间,提出了一种具有多组并行神经网络和共享决策模块的分支深度强化学习架构。实现了最优控制与博弈论的结合,有效解决了微分对策模型高度非线性且难于利用经典最优控制理论进行求解的难题,进一步提升了深度强化学习对离散行为的学习能力,并通过算例仿真检验了该算法的有效性。     

差动活塞式热气自增压系统方案研究

针对液体姿轨控发动机差动活塞式热气自增压系统,设计了间接比对式、直接比对式和电磁阀控制式等三种方案,分析了系统工作原理,建立了动态仿真模型,进行了动态特性研究,并分析了各方案技术特点。研究结果表明：间接比对式系统起动药量为2.64g,起动时间为0.688s,系统自锁时贮箱压力为7.58MPa（偏离额定值9.86%）;可预包装设计。直接比对式系统起动药量小（2.43g）,起动响应快（0.573s）,推进剂贮箱最大工作压力小（7.09MPa,2.75%）;该方案引入了阀芯杆处热滑动密封及流量调节器气液腔隔离面的热隔离防护需求,热控要求高,技术难度较大;可预包装设计。电磁阀控制式系统起动药量小（2.43g）,起动迅速（0.438s）,推进剂贮箱工作压力稳定;测控的引入有功耗需求,并增大了系统体积和质量,不能进行独立的预包装设计。     

我国航空军品定价体制下的博弈及效率分析

根据我国航空军品现行的定价体制及定价过程,构建了一个抽象化的分析模型,以描述及分析现行成本加成定价体制下,市场参与各方的博弈行为及其对效率的影响.研究结果表明,在现行的成本加成定价体制下,制造企业有充分的动机虚增生产成本;上游企业的成本虚增不仅给本企业带来了好处,也为下游企业带来了利润贡献,下游企业有充分的动机去纵容上游企业的成本虚增行为;越是上游的企业其成本虚增行为对最终产品价格的影响效应就越大.针对发现的问题,最后提出了相应的政策性改善建议.      

Differential emission measure distributions in X-ray solar flares

X-ray spectrometer RESIK has observed spectra in the four wavelength bands from 3.3 Å to 6.1 Å. This spectral range contains many emission lines of H- and He-like ions for Si, S, Ar and K. These lines are formed in plasma of coronal temperatures (T > 3 MK). Analysis of their intensities allows studying differential emission measure distributions (DEM) in temperature range roughly between 3 MK and 30 MK. The aim of present study was to check whether any relationship exists between the character of DEM distribution, the event phase and the X-ray flare class. To do this we have calculated and analyzed the DEM distributions for a set of flares belonging to different GOES classes from the range B5.6–X1. The DEM distributions have been calculated using “Withbroe–Sylwester” multiplicative, maximum likelihood iterative algorithm. As the input data we have used absolute fluxes observed by RESIK in several spectral bands (lines + continuum). Respective emission functions have been calculated using the CHIANTI v. 5.2 atomic data package.     

基于决策树的多防御方目标攻防决策

针对多方对抗博弈问题的复杂性和多样性,提出了利用决策树思想对多防御方的目标攻防问题的策略进行决策树分类,再利用决策树分类模型对多防御方的目标攻防问题的攻防策略进行快速决策。首先,对多防御方目标攻防问题利用决策树ID3算法以攻防双方的策略作为类别属性进行分类,得到多防御方目标攻防问题的决策树模型;然后,对多方对抗中的攻击方,基于距离的威胁权重函数得到攻击方的轨迹;最后,得到防御方的协同合作策略,并进行了仿真验证。     

基于基因算法与博弈论的气动高升力优化

A multi-objective evolutionary optimization method (combining genetic algorithms(GAs)and game theory(GT))is presented for high lift multi-airfoil systems in aerospace engineering.Due to large dimension global op-timization problems and the increasing importance of low cost distributed parallel environments,it is a natural idea to replace a globar optimization by decentralized local sub-optimizations using GT which introduces the notion of games associated to an optimization problem.The GT/GAs combined optimization method is used for recon-struction and optimization problems by high lift multi-air-foil desing.Numerical results are favorably compared with single global GAs.The method shows teh promising robustness and efficient parallel properties of coupled GAs with different game scenarios for future advanced multi-disciplinary aerospace techmologies.     

基于纯策略的灰矩阵二人有限零和博弈模型研究

运用灰色系统理论分析和研究了基于纯策略的灰矩阵二人有限零和最保守博弈决策问题。研究了灰博弈损益值矩阵的特性，构建了该问题的数学模型．提出并证明了该PI题的局中人各单方面和整体的灰矩阵二人有限零和最保守博弈决策有解的充分必要条件，提出了该问题解的灰鞍点概念。在此基础上，用该灰矩阵博弈理论来解决某单位冬季取暖用煤的采购决策问题，取得了良好效果。     

Optimal Power Management for Antagonizing Between Radar and Jamming Based on Continuous Game Theory

To solve the problem of dynamic power resource allocation for cooperative penetration combat,the continuous game theory is introduced and a two-person general-sum continuous-game-based model is put forward with a common payoff function named collaborative detection probability of netted radar countermeasures.Comparing with traditional optimization methods,an obvious advantage of game-based model is an adequate consideration of the opposite potential strategy.This model guarantees a more effective allocation of the both sides′power resource and a higher combat efficiency during a combat.Furthermore,an analysis of the complexity of the proposed model is given and a hierarchical processing method is presented to simplify the calculating process.Simulation results show the validity of the proposed scheme.     

深空导航无线电干涉测量技术的发展历程和展望

结合世界各航天大国和组织所开展的深空探测活动和深空测控系统建设中,对无线电干涉测量技术的开发、应用以及深空导航技术试验验证情况,系统地梳理和总结了深空导航无线电干涉测量技术的发展历程,并通过该技术未来在国际上几个主要深空探测任务中的应用规划,分析了无线电干涉测量领域未来的发展方向.该领域技术的最新发展对我国深空测控网无线电干涉测量系统的后续建设也具有重要的借鉴意义.