搜索结果: 1-15 共查到“UWB”相关记录115条 . 查询时间(0.067 秒)
罗德与施瓦茨为博世提供汽车UWB连接验证方案(图)
罗德 施瓦茨 R&S CMP200 无线通信测试仪 汽车生产 UWB
2022/4/1
博世集团选择罗德与施瓦茨的R&S CMP200无线通信测试仪,用于在汽车生产中验证超宽带(UWB)应用。该项目是博世和罗德与施瓦茨在无线通信领域长期合作项目的一个延续。更大的覆盖范围、更低的能耗和良好的安全性使得超宽带(UWB)有可能为大量物联网周边设备和工业4.0应用提供助力,并有望成为大部分智能手机标配的技术。在汽车领域,UWB更加方便并支持更安全的应用,例如配备无钥匙进入系统的车辆可以使用智...
INDOOR PHOTOGRAMMETRY AIDED WITH UWB NAVIGATION
Low Cost 3D Reconstruction Mobile Mapping UWB Photogrammetry Indoor Positioning
2018/6/4
The subject of photogrammetric surveying with mobile devices, in particular smartphones, is becoming of significant interest in the research community. Nowadays, the process of providing 3D point clou...
UWB with Pulse Reordering: Securing Ranging against Relay and Physical Layer Attacks
secure ranging physical layer security
2017/12/25
Physical layer attacks allow attackers to manipulate (spoof) ranging and positioning. These attacks had real world impact and allowed car thefts, executions of unauthorised payments and manipulation o...
GEOREFERENCING IN GNSS-CHALLENGED ENVIRONMENT: INTEGRATING UWB AND IMU TECHNOLOGIES
Ultra-wide band GNSS-denied positioning UXO mapping
2017/7/12
Acquiring geospatial data in GNSS compromised environments remains a problem in mapping and positioning in general. Urban canyons, heavily vegetated areas, indoor environments represent different leve...
A multitude of applications would benefit from precise indoor navigation. Anywhere from automating storage in warehouses to tracking firemen in hazardous environments would make such an endeavor worth...
Testing and Research on Interference to GPS from UWB Transmitters
Testing Research Interference GPS UWB Transmitters
2015/6/29
Ultra-Wideband (UWB) signal transmission is a potentially promising technology that is defined by a large fractional bandwidth. Most UWB systems are based on very short pulses of radio frequency energ...
We compared positioning performance of GPS and DGPS to that of GPS/DGPS integrated with non-interfering UWB transponders. Simulations of a simple test case predict 15% horizontal accuracy improvement ...
在超宽带合成孔径雷达叶簇隐蔽目标检测中,传统的UWB SAR图像变化检测方法易受图像灰度值起伏和成像条件变化的影响,致使现有的变化检测算法的性能下降.本文根据人类视觉系统的生理结构和认知特点,提出了一种基于视觉注意机制的叶簇隐蔽目标变化检测算法.该方法使用视觉注意模型,将图像的多尺度特征信息融合为单幅视觉显著图像,并利用图像局部邻域信息和目标的空间相关特性对视觉显著图中视觉注意焦点进行分层筛选和变...
Wireless Physical-Layer Security Performance of UWB systems
UWB security wireless physical layer
2014/12/8
Traditionally, spread-spectrum systems have been employed to provide low probability-of-intercept (LPI) and low probability-of-detection (LPD) performances at the physical layer, but the messages tran...
UWB机载SAR方位空变误差精确补偿方法
运动误差 方位谱形成 方位空变误差 运动补偿
2014/3/30
超宽带SAR高分辨成像需要较大的方位积累角,在宽波束情况下,机载平台的侧向扰动误差相对不同方位波束的目标存在较大的差异,即误差在存在方位空变性。成像过程中方位空变误差补偿非常困难,严重影响成像质量。本文提出了一种新的方位空变误差精确补偿方法,该方法利用回波方位谱与波束方位角的对应关系,采用DFT变换和运动误差补偿相结合,在回波方位谱形成时对不同方位角目标的误差精确补偿。经过仿真和实测试验数据验证,...
对多频带正交频分复用超宽带系统同步技术进行研究,提出一种基于时域扩展技术(TDS)的盲载波频偏(CFO)跟踪算法。利用数据符号与其时域扩展符号的特殊映射关系,在时域和频域分别推导出残余载波频偏的盲估计公式,并构建相应的时频跟踪环路。仿真结果表明,该盲算法具有比导频辅助法更优的跟踪性能。10dB信噪比下,基于TDS进行时频跟踪的残余CFO均方根误差均达到2×10?4,系统误比特率可达10?6数量级。
Ultra-Wideband (UWB)技术被认为是最适合进行室内无线定位的技术,IEEE802.15.4a给出的TW-TOA(Two Way Time of Arrival)测距协议中采用的是基于时间戳报文的接收-发送周转时延消除的方法,但是同类设备在相同的环境下其周转时延是相同的,所以为了减少测距双方的数据通信量,提出了一种基于固定周转时延的测距协议;为了提高Hello帧的可靠性提出了在初次定...
一站固定式双基地低频UWB SAR具有方位移变的距离徙动和较长的合成孔径,这导致其距离方位耦合变得非常复杂,从而限制了频域算法的应用.为此,本文提出一种基于椭圆极坐标的一站固定式双基地低频UWB SAR FFBP算法.基于一站固定式双基地SAR的成像几何,分别推导了直角坐标与椭圆极坐标下后向投影算法的解析表达式,并讨论了双基地FFBP算法中采用椭圆极坐标的优势.然后分别从频带和斜距误差角度推导了子...
UWB密集多径下基于检测概率差值最大的TOA估计方法
超宽带 密集多径 阈值 检测概率差值最大
2013/8/17
密集多径信道下,较为实际的超宽带测距系统一般采用基于TOA信息的能量检测器(energy detector, ED)接收机。TOA的估计精度决定着测距精度。在ED中多采用阈值比较的方法来估计TOA,阈值的设计对TOA估计的精度有着非常重要的影响。本文将最大概率检测(maximum probability of detection, MPD)算法应用于基于ED的TOA估计器中,并对样本检测概率计算方...