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针对航天器双主动交会问题,以两航天器能量消耗之和最小为最优交会指标,建立了一种寻求远程导引可行飞行方案的算法模型,以满足远程导引对测控、日照和任务时间等要求。仿真结果表明,该算法可行。 相似文献
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低密度校验码是一类能有效逼近香农限的好码,而高进制的LDPC码具有比二进制LDPC码更好的性能,但其译码复杂度太高不利于工程应用。本文提出了一种基于协同优化算法的低复杂度的高进制LDPC码的译码算法,并讨论了其在深空通信中的应用。 相似文献
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In this paper, we study relay selection under outdated channel state information (CSI) in a decode-and-forward (DF) cooperative system. Unlike previous researches on cooperative commu-nication under outdated CSI, we consider that the channel varies continuously over time, i.e., the channel not only changes between relay selection and data transmission but also changes during data transmission. Thus the level of accuracy of the CSI used in relay selection degrades with data transmission. We first evaluate the packet error rate (PER) of the cooperative system under contin-uous time-varying fading channel, and find that the PER performance deteriorates more seriously under continuous time-varying fading channel than when the channel is assumed to be constant during data transmission. Then, we propose a repeated relay selection (RRS) strategy to improve the PER performance, in which the forwarded data is divided into multiple segments and relay is reselected before the transmission of each segment based on the updated CSI. Finally, we propose a combined relay selection (CRS) strategy which takes advantage of three different relay selection strategies to further mitigate the impact of outdated CSI. 相似文献
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针对通信拓扑切换条件下的多飞行器协同拦截问题,提出了一种基于扩张状态观测器的协同制导方法。建立协同制导设计模型,将协同拦截问题转换为视线稳定条件下的剩余飞行时间调节问题。为解决机动目标状态不确定的问题,将目标的状态视作扰动,设计扩张状态观测器来估计机动目标的状态,并在制导律中对目标的机动进行补偿。利用有限时间一致性理论进行一致性控制协议的设计,实现各飞行器剩余飞行时间的有限时间一致,并利用Lyapunov稳定性理论分析通信拓扑切换情况下闭环系统的有限时间稳定性,给出了系统一致收敛时间。仿真结果表明,在通信拓扑变换的情况下,设计的观测器能够有效估计目标状态,且协同制导律能够满足对剩余飞行时间的控制要求,进而实现协同拦截。 相似文献
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A joint mid-course and terminal course cooperative guidance law for multi-missile salvo attack 总被引:1,自引:0,他引:1
Salvo attacking a surface target by multiple missiles is an effective tactic to enhance the lethality and penetrate the defense system. However, existing cooperative guidance laws in the mid-course or terminal course are not suitable for long- and medium-range missiles or stand-off attacking. Because the initial conditions of cooperative terminal guidance that are generally generated from the mid-course flight may not lead to a successful cooperative terminal guidance without proper mid-course flight adjustment. Meanwhile, cooperative guidance in the mid-course cannot solely guarantee the accuracy of a simultaneous arrival of multiple missiles. Therefore, a joint mid-course and terminal course cooperative guidance law is developed. By building a distinct leader-follower framework, this paper proposes an efficient coordinated Dubins path planning method to synchronize the arrival time of all engaged missiles in the mid-course flight. The planned flight can generate proper initial conditions for cooperative terminal guidance, and also benefit an earliest simultaneous arrival. In the terminal course, an existing cooperative proportional navigation guidance law guides all the engaged missiles to arrive at a target accurately and simultaneously. The integrated guidance law for an intuitive application is summarized. Simulations demonstrate that the proposed method can generate fast and accurate salvo attack. 相似文献
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Building an organization and management structure to create, launch, utilize and protect a satellite solar power energy system will require a global policy for the beneficial use of SSP. The fundamental organizational tasks are: (1) R&D, achieved through a project organization characterized by the integrated management of applied science, development research and construction engineering; (2) investment, generated by a series of groups creating financial vehicles for public and private investment; (3) transmission and distribution, characterized by attention to an engineering and maintenance process emphasizing high reliability; and (4) crisis response, demanding readiness for instant response to potential internal or external scenarios. A differentiated global organization spanning the long timeframe of SSP will need to have a central management core representative of all parts of the organization, with the capacity for self-renewal and re-adaptation. To be successful over its long timeframe, the SSP organization will need to build continuity and public confidence through intergenerational communication, public education, and community outreach. Integrating structures must be created at all levels of the organization, and should encompass joint work tasks and information-sharing among both industrial and government members. Developmental and alliance partners who support the formation and financing of a differentiated satellite solar power organization will share commensurately in the technologies and competencies that are created. 相似文献
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针对多飞行器协同拦截机动目标时几何构形会影响协同探测和制导效果的问题,基于最优控制理论提出一种考虑探测构形的协同探测与制导一体化设计方法。基于飞行器相对运动学、动力学方程和双视线协同探测原理,建立了协同拦截模型。在制导设计中引入视线分离角参量以调制协同探测几何构形、减小相对距离探测误差,从而在制导全程增强协同探测效果。将相对距离协同探测结果应用到剩余时间和制导律解算中,基于最优控制理论实现协同探测与制导环节一体化设计。仿真结果表明:在目标进行不同程度机动的情况下,与修正比例导引律相比,所提方法在协同探测和制导方面均具有明显优势。 相似文献
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