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徐文 《中国科学:信息科学》2011,(Z1)
本文回顾总结了我国陆地观测卫星载荷体系、地面系统建设及数据应用等方面的发展现状和成就,分析了当前所面临的挑战和任务,以此为基础,对我国陆地观测卫星的未来发展进行了战略思考和展望,提出了加强国家顶层规划、加强地面系统统筹建设、实现系列化业务化运营、加强国际合作、推进产业化发展等建议. 相似文献
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简述了国内外光学微小卫星的发展现状,对近二十年来国内外光学微小卫星的轨道、尺寸、质量等主要参数进行了统计和分析。由此发现,现代光学微小卫星普遍采用太阳同步轨道,其质量、尺寸以及功耗呈逐年下降的趋势。数据表明,光学微纳卫星已经进入了高速发展阶段,即将成为光学微小卫星的中坚力量。但综合考虑成本、功耗和关键效能等因素,光学微小卫星的尺寸和质量并不是越小越好,最终将稳定在一个合适的尺寸。现代光学微小卫星的谱段设置灵活且针对性强,拥有较强的综合探测能力,一星多用、一星多能将会成为未来光学微小卫星的普遍特点。另外,相比于CCD,CMOS具有成本优势,且新型CMOS的研制取得了重大进展,预计CMOS器件将会被更多地应用到光学微小卫星之中。 相似文献
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张锡祥 《中国电子科学研究院学报》2010,5(2)
临近空间平台是在信息化时代新军事变革远距离精确打击的现实条件下,出现的一种新型平台;它弥补了预警飞机探测距离不够和低轨卫星监视时间太短等缺点而必然产生的一种适合信息化作战的新型平台;它是一种地、海、空、天一体化的作战体系,一种侦察、警戒、干扰、指挥于一体的空间平台,其作战指挥功能和侦察干扰能力超过了预警飞机和干扰飞机。临近空间平台位置高、看得远,高度一般在20 km~100 km之间,适合于监视1 000 km远的精确打击目标,也适合于干扰和监视沿海在1 000 km内活动的航母战斗群,适合于对抗设在我国周围1 000 km左右距离的反导防御系统雷达前哨站。 相似文献
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《Mechatronics》2014,24(8):1223-1230
This paper presents a design methodology based on the distributed actuation principle to achieve a high-performance robot manipulator. Spatial movement of the actuation points provides several advantages such as high payload capacity, high efficiency and a light weight structure for the proposed robot manipulator. Based on the analysis, the distributed actuation mechanism using a single slider is adopted for the proposed manipulator. A prototype of the manipulator with two degrees of freedom is developed and controlled as an example. The efficacy of the proposed approach is verified experimentally. 相似文献
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This paper considers the containment control problem for uncertain QUAV (Quadrotor Unmanned Aerial Vehicle) multiagents with time-varying payloads under a fixed topology graph, and a distributed adaptive containment control protocol with multiple variable constraints is proposed. Generally, the control framework is classified into two layers. In the first layer, the desired trajectories are determined for followers by the communication topology and initial values of leaders. For the second layer, the ith QUAV follower is required to track the desired trajectory by employing the information of itself and neighbors. Under the second layer, the system of the ith agent is decoupled into two subsystems: the translational subsystem and the rotational subsystem. For the translational subsystem, the distributed adaptive containment controller is designed via dynamic surface control method to track the desired position trajectory. With such method, the information requirement of ith agent for its neighbors can be reduced significantly. For the rotational subsystem, the adaptive tracking controller is constructed to track the desired attitudes derived from translational subsystem through commonly used attitudes extraction algorithms. In the end, the resulting closed-loop system is proved to be stable in the sense of uniformly ultimate boundness, and the effectiveness of the proposed approach is illustrated by numerical simulations. 相似文献
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This paper is concerned with the control problem of a multi-robot system handling a common payload with unknown mass properties. Force constraints at the grasp points are considered. Robust control schemes are proposed to cope with the model uncertainty and achieve asymptotic path tracking. To deal with the force constraints, a strategy for optimally sharing the task is suggested. This strategy basically consists of two steps. The first is to detect the roots that need help and the second to arrange for help. It is shown that the overall system is robust to uncertain payload parameters, and satisfies the force constraints. 相似文献
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