共查询到20条相似文献,搜索用时 15 毫秒
1.
Indoor Location Based Services (LBS), such as indoor navigation and tracking, still have to deal with both technical and non-technical challenges. For this reason, they have not yet found a prominent position in people’s everyday lives. Reliability and availability of indoor positioning technologies, the availability of up-to-date indoor maps, and privacy concerns associated with location data are some of the biggest challenges to their development. If these challenges were solved, or at least minimized, there would be more penetration into the user market. This paper studies the requirements of LBS applications, through a survey conducted by the authors, identifies the current challenges of indoor LBS, and reviews the available solutions that address the most important challenge, that of providing seamless indoor/outdoor positioning. The paper also looks at the potential of emerging solutions and the technologies that may help to handle this challenge. 相似文献
2.
针对位置服务(LBS)在深度室内环境下将无法进行GPS定位问题,提出一种融合GPS、Wi-Fi、ZigBee和蓝牙混合的LBS室内节点信道分配模型和可信度评估与控制方法。信道分配模型解决了组合信道分配包括业务负载判据和每个节点的可用射频及非重叠的射频信道的数量问题。通过对每一个接入点(AP)的信号强度建立与参考点的信号强度的预测模型,采用基于能量度量优化算法判断选择组合信道可信度,自适应选择性能好的邻居节点参与迭代优化。仿真结果表明,该方法能有效抑制通信干扰误差在网络内的扩散,降低定位复杂度,提高定位精度,同时提高整个网络的扩展性与鲁棒性。 相似文献
3.
4.
近年来随着技术的进步和人们生活水平的提高,人们生活中的大多数时间都是在室内度过的,所以对室内定位的各种需求在不断增长,逐渐成为一个研究的热点。因此,本文设计了一种基于蓝牙信标的室内定位系统,该系统在分析了蓝牙信标的RSSI信号的分布特点的基础上,采用高斯滤波和卡尔曼滤波融合使用的方式来对接收到的信号实行滤波处理,接着在大量地实地测试的基础上,建立了RSSI信号的测距模型,最后使用三边质心算法作为定位算法。 相似文献
5.
Sultan Alamri David Taniar Maytham Safar Haidar Al-Khalidi 《Personal and Ubiquitous Computing》2014,18(2):287-301
With the currently available indoor positioning devices such as RFID, Bluetooth and WI-FI, the locations of moving objects constitute an important foundation for a variety of applications such as the tracking of moving objects, security and way finding. Many studies have proven that most individuals spend their lives in indoor environments. Therefore, in this paper, we propose a new index structure for moving objects in cellular space. The index is based on the connectivity (adjacency) between the indoor environment cells and can effectively respond to the spatial indoor queries and enable efficient updates of the location of a moving object in indoor space. An empirical performance study suggests that the proposed indoor-tree in terms of measurements and performance is effective, efficient and robust. 相似文献
6.
随着GIS、LBS技术和移动互联网技术等核心技术的发展,服务于普通大众的个人导航系统成为应用热点。室内行走引导是个人导航系统的核心之一,其中涉及的室内定位技术一直是研究的难点之一。基于固定式RFID标签群,生成室内位置地图,将随身移动式RFID读写器和个人智能手机相结合,完成室内定位、路径计算和导航提醒。基于上述设计方案,完成了一个基于RFID的南京大学校园导航系统,并将其投入了实际使用。 相似文献
7.
8.
在复杂的室内WLAN环境下,利用改进的MK模型和加权K最近邻法对定位性能进行了改进。首先介绍了室内传播模型及改进的MK模型;然后介绍了位置指纹定位方法及两种定位算法的基本原理,根据实测数据,分析了以上方法的定位效果以及误差来源;最后提出了MK模型和加权K最近邻法相结合的混合定位法,并对算法进行了仿真和分析。仿真结果表明,所提算法提高了算法精确度,减小了定位误差。 相似文献
9.
针对在室内环境的轨迹跟踪过程中,通信开销较大和算法复杂度较高的问题,对一种基于CSI(channel state information)信号的人员轨迹跟踪方法进行研究。首先从CSI中提取代表目标位置(角度)概率的AOA(angle-of-arrival)频谱,通过MUSIC算法得到的多普勒频移与AOA频谱相结合来确定人员移动速度及位置;最后利用改进的三边定位质心算法确定人员位置、模拟人员移动轨迹,实现了对室内人员精准的跟踪定位。通过与其他算法以及不同人员移动速度的对比,仿真实验表明提出的人员追踪方法可以大幅度提高定位的精确性与稳定性。 相似文献
10.
An indoor localization dataset and data collection framework with high precision position annotation
We introduce a novel technique and an associated high resolution dataset that aim to precisely evaluate wireless signal based indoor positioning algorithms. The technique implements an augmented reality (AR) based positioning system that is used to annotate the wireless signal parameter data samples with high precision position data. We track the position of a practical and low cost navigable setup of cameras and a Bluetooth Low Energy (BLE) beacon in an area decorated with AR markers. We maximize the performance of the AR-based localization by using a redundant number of markers. Video streams captured by the cameras are subjected to a series of marker recognition, subset selection and filtering operations to yield highly precise pose estimations. Our results show that we can reduce the positional error of the AR localization system to a rate under 0.05 meters. The position data are then used to annotate the BLE data that are captured simultaneously by the sensors stationed in the environment, hence, constructing a wireless signal dataset with the ground truth, which allows a wireless signal based localization system to be evaluated accurately. 相似文献
11.
12.
为了使人们在各种各样的室内环境中,也能享受到定位服务带来的便利,基于Android手机平台通过采用RSSI定位的方法,设计和实现了一个LBS系统平台.该平台整合了室内定位的功能以及时下最流行的微博功能,使其他用户可以通过调用平台的接口,基于该平台设计出各种应用于不同环境的购物辅助系统.当消费者购物时可以通过该系统更方便的进行购物,从而使人们在室内环境下也能享受到普适计算带来的便利.通过一个实例验证了该系统的可行性及实用性. 相似文献
13.
针对视距(line-of-sight, LOS)和非视距(none-line-of-sight, NLOS)混合环境的定位跟踪问题, 提出一种基于扩展H∞滤波(EHF)和扩展卡尔曼滤波(EKF)的交互式多模型(IMM)定位跟踪算法。目标与基站之间的LOS、NLOS传输信道分别用EKF和EHF匹配, 模型间的转换用马尔可夫过程进行描述。Monte Carlo仿真结果表明, 该算法具有较高的定位精度、较好的跟踪稳定性, 且计算时间与基于EKF的IMM算法相当, 具有较好的可实现性。 相似文献
14.
15.
传统载波相位差分算法在形变监测领域适用性不足,实时动态定位(RTK)精度难以满足要求,而载波双差静态相对定位连续解算时形变跟踪性能较低等。针对这些问题,在对动静态算法深入研究的基础上,提出一种基于载波相位差分的动静态自适应融合算法。通过方差变化法实时判断定位结果是否收敛,自适应调节扩展卡尔曼滤波(EKF)状态先验估计过程。在收敛时刻增大位置参数的先验估计误差的协方差值,使EKF后验估计过程倾向于信赖测量值;未收敛时刻通过EKF迭代,使EKF后验估计过程倾向于信赖状态预测值。实验结果表明:相比传统RTK新算法精度有明显提高,水平达±2 mm内,高程达到±4 mm内;相比静态定位则缩减了观测周期,提高了微小形变跟踪性能。 相似文献
16.
针对传统的基于WIFI信号的室内定位方法难以有效解决环境动态变化对RSSI值的影响问题,本文设计并实现了一种基于WIFI射频信号强度指纹的室内定位系统。在该系统中,通过采用一种基于用户使用状况与布置定位参考点的方法来动态更新系统的WIFI指纹数据库,从而有效降低了在实际使用过程中用户手持手机的方向、用户的身体遮挡以及使用环境的动态变化对RSSI值所带来的影响。实验结果表明,本文设计并实现的定位系统比传统定位系统更稳定、易维护,同时也具有更高的定位精度和自适应性。 相似文献
17.
《Journal of Systems Architecture》2014,60(9):741-756
Indoor location-based service (LBS) is generally distinguished from web services that have no physical location and user context. In particular, various resources have dynamic and frequent mobility in indoor environments. In addition, an indoor LBS includes numerous service lookups being requested concurrently and frequently from several locations, even through a network infrastructure requiring high scalability in indoor environments. The traditional centralized LBS approach needs to maintain a geographical map of the entire building or complex in its central server, which can cause low scalability and traffic congestion. This paper presents a self-organizing and fully distributed indoor LBS platform with regional cooperation among devices. A service lookup algorithm based on the proposed distributed architecture searches for the shortest physical path to the nearest service resource. A continuous service binding mechanism guarantees a probabilistic real-time QoS regardless of dynamic and frequent mobility in a soft real-time system such as an indoor LBS. Performance evaluation of the proposed algorithm and platform is compared to the traditional centralized architecture in the experimental evaluation of scalability and real test bed environments. 相似文献
18.
提出了一种融合多模传感器的室内实时高精度轨迹生成方法,亦即将室内Wi-Fi定位与传感器定位结合起来,生成用户在室内移动的实时轨迹。首先由Wi-Fi定位出用户的初始位置,然后结合Wi-Fi定位的结果以及多个传感器的数据,得到用户的运动速度以及方向,通过航迹推算算法得到用户下一时刻的位置,最后对得出的位置坐标进行卡尔曼滤波处理,得到用户的位置坐标,最终生成用户移动的实时轨迹。实验结果表明,该方法可以得到比Wi-Fi定位更为平滑稠密的移动轨迹,且精确度 比其他同类方法更高。 相似文献
19.
20.
针对传统无线定位技术在室内定位精度不高的问题,设计实现了一种基于超宽带(UWB)技术的室内定位系统。首先,提出了定位服务器与移动端APP实时交互的系统结构,解决室内移动人员自主定位与导航的问题。其次,在双向测距(TWR)算法中增加一条无线电信息以减小时钟偏移引起的测距误差,从而提高算法性能。最后,将通过到达时间差(TDOA)定位算法得到的双曲面方程组进行线性化处理后结合Jacobi迭代法完成求解,避免了使用标准TDOA定位算法难以直接解算的情况。经测试,该系统在楼道房间等场景中能稳定工作且定位误差控制在30 cm以内,相比基于WiFi、蓝牙等技术的定位系统在定位精度上提高了10倍左右,能够满足在复杂室内环境中的精确移动定位需求。 相似文献