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【摘要】
倒车雷达是汽车泊车或者倒车时的安全辅助装置,能以声音或者更为直观的显示告知驾驶员周围障碍物的情况,解除了驾驶员泊车、倒车和起动车辆时前后左右探视所引起的困扰,并帮助驾驶员扫除了视野死角和视线模糊的缺陷,提高驾驶的安全性。本设计利用ATMEL公司的AT89C51单片机、超声波传感器测距实现超声波倒车雷达。利用LED和发光二极管表示传感器探测范围内是否有障碍物,当在探测范围内有障碍物时,发光管以一定频率闪烁,闪烁的频率以距离定,距离越近频率越高。同时蜂鸣器提示报警,探测并指明障碍
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针对射频识别系统中的标签碰撞问题,提出了一种基于分组策略的RFID自适应防碰撞算法。该算法在二叉树搜索算法的基础上引入分组策略、后退策略、自适应地选择四叉树搜索策略、动态调整标签碰撞检测过程策略,减少了搜索次数和读写器与标签间的通信量,提高了识别效率。-Systems for radio frequency identification tag collision problem, a packet-based strategy RFID adaptive anti-collision algo
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本文把小波变换应用于心电信号的识别。探讨了伸缩尺度和伪频率(译自pseudo—frequency)-~.间的关系;利用二进双正
交样条小波对室扑信号按Mallat算法进行小波分解;提出了心室扑动和心室颤动信号的小波变换识别方法-Wavelet transform in used to identify the ECG si a1.The relation between scale and pseudo—frequency is discussed.The ventrlcular
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光伏并网系统中的孤岛效应研究--光伏控制技术-3Islanding detection method based on positive feedback frequency difference
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基于改进滑模频率偏移法的光伏孤岛检测研究-PV islanding detection based on improved sliding mode frequency offset
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自适应主动频率偏移孤岛检测新方法--光伏控制技术-Adaptive Active frequency offset islanding detection of a new method
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The objective of this study is improving channel estimation accuracy in OFDM system because channel state information is required for signal detection at receiver and its accuracy affects the overall performance of system and it is essential to impro
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概述军用飞行目标对微波雷达的散色特性,讨论目标的高频散色机理,RCS分析方法及减缩途径,以及低RCS目标探测技术-Overview military flying targets scattered on color characteristics of microwave radar, discuss the target color high-frequency dispersion mechanism, RCS analysis and reduction pathways, and lo
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提高目标检测通过的OFDM雷达信号频率分析-Improved Target Detection through OFDM Radar Signals Frequency Analysis
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基于小波变换和 HHT 的分布式并网系统谐波检测方法。
该方法利用小波变换多分辨率分析思想对信号进行划分,并对划分后的信号进行经验模态分解,得到一系列的经验模态函数IMF,并从 IMF分量中提取出基波分量和高次谐波;再对IMF分量进行Hilbert 变换得到信号的频率、幅值信息。-Wavelet transform and HHT based distributed systems and network harmonic detection method.
The method use
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Abstract—In slow frequency hopping systems, it is critical
to detect, classify, and mitigate interference, as it degrades the
system performance. Generalized likelihood ratio test algorithm
was proposed for the detection of interference. Howeve
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