排序方式: 共有101条查询结果,搜索用时 0 毫秒
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对角加载MVDR技术是一种经典的空间谱估计技术,在水声阵列信号处理中有着广泛的应用。该技术之所以具有较好的性能是由于其通过对角加载使样本协方差矩阵的特征值分散度减小。提出了基于随机矩阵理论的MVDR空间谱估计技术,具体思路是利用随机矩阵特征值的极限性质实现样本协方差矩阵噪声的抑制,以达到类似对角加载能够实现的特征值分散度减小的效果。仿真表明所提出的方法与对角加载方法达到了同样的目的,且当快拍数一定,而信噪比由小变大时,该方法可以达到与对角加载MVDR技术相当的性能;当信噪比设为定值,快拍数由小变大时,其与对角加载技术具有相同的DOA估计成功概率变化趋势,且在小样本情况下,此方法优势较为明显。 相似文献
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对二维虚拟ESPRIT算法进行了改进 ,在保持原算法计算量小这一优点的基础上 ,提高了阵元利用率 ,或者减小了对阵列结构的要求 相似文献
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调运问题中基于栅格模型的快速路径规划方法 总被引:2,自引:2,他引:0
针对调运路径规划这一问题,采用栅格模型表示环境地图,通过设定路径搜索方向权重,剔除不必要的搜索区域,提高了搜索效率.仿真结果表明,该算法能有效地提高路径搜索效率,并能搜索到最优路径. 相似文献
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自20世纪中叶,美军舰载指挥控制系统中频繁出现一个词“CIC( Combat Information Center)”,由此,CIC作为舰艇中枢神经,几乎成为美军各型舰艇的标准配置。国内很多技术人员和参考书籍将CIC翻译成“作战情报中心”,这容易引起很多误解。注意CIC用词“Information”,不是“Intelligence”,一词之差、谬之千里,应该译为“作战信息中心”。侧重于对CIC的内涵进行剖析,试图揭示其内在的发展规律。 CIC的演化过程中蕴涵着美军在装备发展过程中的各种试错、实践、经验和教训,美军装备建设的严谨、求实和科学的成份,特别是其技术进步的持续性和连贯性,值得借鉴和思考。 相似文献
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This article investigates the impact of timing on sellers' information acquisition strategies in a duopoly setting. Market uncertainty is captured by a representative consumer who has a private taste for the product's horizontal attribute, and both sellers can acquire this information either before (ex‐ante acquisition) or after (ex‐post acquisition) observing their own product qualities. We identify several conflicting effects of information acquisition that vary significantly in its timing and market characteristics. In the monopoly scenario, information acquisition is unambiguously beneficial and ex‐ante acquisition is the dominant option, because it helps a seller not only design the proper product but also craft better pricing strategy. By contrast, when there is competition, information acquisition eliminates the buffer role of market uncertainty and leads to the fiercest production or pricing competition, which makes the subsequent effects of acquisition detrimental, and a seller's payoff is nonmonotonic in terms of its acquisition cost. Moreover, compared with the ex‐ante information acquisition, ex‐post information acquisition normally generates higher sellers' equilibrium payoffs by postponing the timing of acquisition and maintaining product differentiation. Nonetheless, ex‐post information acquisition also provides the seller with greater acquisition incentive and occasionally makes him worse off than that in the ex‐ante scenario. Thus, in a competitive environment, having the option of information acquisition and flexibility in its timing can be both detrimental and irresistible. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 3–22, 2016 相似文献
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