排序方式: 共有8条查询结果,搜索用时 171 毫秒
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基于ADSP-BF533的网络音视频监视系统 总被引:2,自引:0,他引:2
主要介绍ADSP-BF533的基本特征,并提出了一种基于ADSP-BF533的具有体积小、成本低等特点的网络视频监视系统的软件和硬件设计方案。 相似文献
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工业物价指数(PPI)是衡量经济的一个重要指标,其与消费价格指数(CPI)具有内在的关联。本文从PPI与CPI的关系出发,分析我国的通货膨胀现象和国家的货币政策,并参考了PPI和CPI的历史数据,得出结论,PPI传导机制作用不明显,宏观经济环境不容乐观。 相似文献
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为了实现实时、动态的雷达箔条干扰显示,在分析PPI显示特性的基础上建立了粒子运动模型。对模拟过程中的所用的技术进行了讨论,给出了模拟显示效果图。 相似文献
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运用西门子PLC中的PPI(点对点)通信协议,构成以西门子s7-200PLC为核心的水处理系统中主从式通讯网络.以其中部分站点为例,详细介绍了PPI通讯物理层的制作和连接方法,同时给出了参数设置选择及软件设计方法. 相似文献
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Denis H.?NomiyamaEmail author Tsugukiyo?Hirayama 《Journal of Marine Science and Technology》2003,8(2):88-98
The importance of ocean waves parameters (propagation direction, mean period, significant wave height, etc.) is related to several aspects of a ships safety, efficiency in operation, routing, design, and maintenance. However, some available methods for obtaining those parameters have data limitations and inconvenient aspects. In severe weather conditions, an ocean-wave-field detector is necessary. This can provide two-dimensional ocean-wave-field information directly. Among other conventional methods, ship-borne wave radar has the ability to function as such a detector, and some researchers have tried to develop practical systems. A numerical approach using plan position indicator (PPI) images from conventional marine radars is proposed to retrieve valuable information from the ocean waves. A three-dimensional Fourier transform is applied to a set of consecutive radar PPI images to perform spectrum analysis. The removal of undesired elements in the spectrum is achieved by applying a hi-pass filter to remove static components, and by comparing the data with the expected dispersion shell to correct for nonocean-wave power. Numerical experiments under controlled conditions using simulated PPI images were performed through numerical simulations based on theoretical ocean-wave equations. The results include a comparison between the original wave parameters used in the simulation and the values retrieved from the spectrum analysis. 相似文献
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一种新型雷达显示系统技术的研究 总被引:1,自引:0,他引:1
以一种新型雷达为背景,在讨论其基本原理及传统雷达显示系统的基础上,提出了针对此型雷达显示系统的设计方案。 相似文献
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