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To address the significant decline in positioning accuracy of traditional algorithms under indoor non line of sight(NLOS)conditions and low beacon deployment density, this paper proposes a fused positioning method based on ranging correction, combining bluetooth low energy(BLE)and pedestrian dead reckoning(PDR). Firstly, the received signal strength(RSS)of BLE is rapidly constructed using SketchUp indoor 3D modeling software integrated with a ray-tracing algorithm, eliminating the need for tedious manual RSS field collection. Subsequently, a variational autoencoder based on convolutional neural network(VAE-CNN)is designed to predict and correct BLE ranging errors, thereby improving BLE positioning accuracy. Finally, an extended Kalman filter(EKF)is employed to fuse the positioning results from BLE and PDR. Experimental results demonstrate that the proposed ranging-corrected BLE positioning and EKF-based fusion positioning achieve superior performance in environments with NLOS interference and low beacon deployment density.
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为解决室内非视距(non line of sight,NLOS)环境以及低信标部署密度下传统定位算法精度急剧下降的问题,提出一种基于测距修正的低功耗蓝牙(bluetooth low energy,BLE)和行人航位推算(pedestrian dead reckoning,PDR)融合定位方法。通过SketchUp室内3D建模软件联合射线追踪算法实现BLE的接收信号强度(received signal strength,RSS)快速构建,避免人工繁琐的RSS实地采集。设计一种基于卷积神经网络的变分自编码器(variational autoencoder based on convolution neural network,VAE-CNN)模型对BLE测距误差进行预测和修正,提升BLE定位精度。采用扩展卡尔曼滤波(extended Kalman filter,EKF)融合BLE和PDR的定位结果。实验结果表明,采用测距修正后的BLE测距定位以及EKF融合定位在NLOS以及信标部署密度低的环境下具有较好的定位性能。
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刘辉,正高级工程师,硕士,主要研究方向为目标检测、深度学习、室内定位。E-mail: liuhui@cqcyit.com。
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刘辉,正高级工程师,硕士,主要研究方向为目标检测、深度学习、室内定位。E-mail: liuhui@cqcyit.com。
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何航川,硕士研究生,主要研究方向为深度学习、室内定位。E-mail: hangchuan_he@163.com。
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何航川,硕士研究生,主要研究方向为深度学习、室内定位。E-mail: hangchuan_he@163.com。
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2018: 1-5., articleTitle=Ray-tracing based fingerprinting for indoor localization, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1251458172242833632, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, xref=null, ext=[AuthorCompanyExt(id=1251458172251222241, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, companyId=1251458172242833632, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=School of Communications and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, P R China), AuthorCompanyExt(id=1251458172255416546, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, companyId=1251458172242833632, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=重庆邮电大学 通信与信息工程学院,重庆 400065)])], figs=[ArticleFig(id=1251458175359201581, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Fig.1, caption=
Framework of BLE and PDR fusion localization algorithm based on ranging error correction, figureFileSmall=XT7duZ4CVn3UvMvD9hzVUg==, figureFileBig=Ch//cFgk7cTMFIPY7A+xXw==, tableContent=null), ArticleFig(id=1251458175455670577, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=图1, caption=
基于测距误差修正的BLE和PDR融合定位算法框架, figureFileSmall=XT7duZ4CVn3UvMvD9hzVUg==, figureFileBig=Ch//cFgk7cTMFIPY7A+xXw==, tableContent=null), ArticleFig(id=1251458175677968703, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Fig.2, caption=
SketchUp interior 3D model, figureFileSmall=YtwKdbgdcD4S6Tsa5/WO8w==, figureFileBig=hqJkARzmRzBYjxJxcq9tNg==, tableContent=null), ArticleFig(id=1251458175753466180, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=图2, caption=
SketchUp室内3D模型, figureFileSmall=YtwKdbgdcD4S6Tsa5/WO8w==, figureFileBig=hqJkARzmRzBYjxJxcq9tNg==, tableContent=null), ArticleFig(id=1251458175858323789, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Fig.3, caption=
Results of ray tracing simulation, figureFileSmall=IVJoO8JwD+MMfugZmbVpNQ==, figureFileBig=iku9h5Ne5oV3nGPrW5Ejcw==, tableContent=null), ArticleFig(id=1251458175938015570, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=图3, caption=
射线追踪仿真结果, figureFileSmall=IVJoO8JwD+MMfugZmbVpNQ==, figureFileBig=iku9h5Ne5oV3nGPrW5Ejcw==, tableContent=null), ArticleFig(id=1251458176034484573, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Fig.4, caption=
VAE module structure diagram, figureFileSmall=b61MC3cLDP7ruyIWTrOyXA==, figureFileBig=8bSigTzqNZmJPTid6K67XQ==, tableContent=null), ArticleFig(id=1251458176130953570, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=图4, caption=
VAE模块结构图, figureFileSmall=b61MC3cLDP7ruyIWTrOyXA==, figureFileBig=8bSigTzqNZmJPTid6K67XQ==, tableContent=null), ArticleFig(id=1251458176219033960, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Fig.5, caption=
Ranging error prediction model based on VAE-CNN, figureFileSmall=P16F7iGePodwEN56Q1cHzg==, figureFileBig=d4lzOXVj97KzB06n85doyw==, tableContent=null), ArticleFig(id=1251458176298725745, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=图5, caption=
基于VAE-CNN的测距误差预测模型, figureFileSmall=P16F7iGePodwEN56Q1cHzg==, figureFileBig=d4lzOXVj97KzB06n85doyw==, tableContent=null), ArticleFig(id=1251458176365834613, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Fig.6, caption=
Experimental environment and floor plan, figureFileSmall=gIuWBCOwCzt1fyKRNeggkA==, figureFileBig=SpYsBdnjKiE0aSKykW6dNw==, tableContent=null), ArticleFig(id=1251458176458109306, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=图6, caption=
实验环境与场景平面图, figureFileSmall=gIuWBCOwCzt1fyKRNeggkA==, figureFileBig=SpYsBdnjKiE0aSKykW6dNw==, tableContent=null), ArticleFig(id=1251458176554578305, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Fig.7, caption=
Ranging measurement error results, figureFileSmall=x4u3ITiegxoCi7kPBvJHIw==, figureFileBig=MLbeQs+wVaUtVuScuqkNlg==, tableContent=null), ArticleFig(id=1251458176625881477, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=图7, caption=
测距误差结果, figureFileSmall=x4u3ITiegxoCi7kPBvJHIw==, figureFileBig=MLbeQs+wVaUtVuScuqkNlg==, tableContent=null), ArticleFig(id=1251458176718156169, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Fig.8, caption=
Comparison results of relative ranging errors, figureFileSmall=SQD8LFROkvx6fBE3LiCH+w==, figureFileBig=eSEKDl4vKRscTexLvAoCaA==, tableContent=null), ArticleFig(id=1251458176818819470, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=图8, caption=
相对测距误差对比结果, figureFileSmall=SQD8LFROkvx6fBE3LiCH+w==, figureFileBig=eSEKDl4vKRscTexLvAoCaA==, tableContent=null), ArticleFig(id=1251458176885928337, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Fig.9, caption=
Obstruction ranging experimental setup, figureFileSmall=HGT8onNHRJDWlOSYpxWxgg==, figureFileBig=wXx1ICkFw8NgmCv1QsSNaw==, tableContent=null), ArticleFig(id=1251458176957231509, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=图9, caption=
遮挡物测距实验设置, figureFileSmall=HGT8onNHRJDWlOSYpxWxgg==, figureFileBig=wXx1ICkFw8NgmCv1QsSNaw==, tableContent=null), ArticleFig(id=1251458177036923290, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Fig.10, caption=
BLE ranging errors with different obstructions, figureFileSmall=h/bcNg64Mtjs5QRJL2IQ8A==, figureFileBig=x8FMJgDllNwJ1Z1iDhEGJQ==, tableContent=null), ArticleFig(id=1251458178643341726, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=图10, caption=
不同遮挡物的BLE测距误差, figureFileSmall=h/bcNg64Mtjs5QRJL2IQ8A==, figureFileBig=x8FMJgDllNwJ1Z1iDhEGJQ==, tableContent=null), ArticleFig(id=1251458178764976548, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Fig.11, caption=
Positioning trajectory and error CDF curve, figureFileSmall=HkA8O/Goe7Phl/HSjJ/VyA==, figureFileBig=saFQyinZQ3suN2ntCFiz9A==, tableContent=null), ArticleFig(id=1251458178907582887, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=图11, caption=
定位轨迹及误差CDF曲线, figureFileSmall=HkA8O/Goe7Phl/HSjJ/VyA==, figureFileBig=saFQyinZQ3suN2ntCFiz9A==, tableContent=null), ArticleFig(id=1251458179100520873, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Tab.1, caption=
Electromagnetic parameters of component materials
, figureFileSmall=null, figureFileBig=null, tableContent=
| 材料 | 相对介电常数εr | 电导率σ/(S/m) |
|---|
| 混凝土 | 6 | 0.01 |
| 石膏板墙 | 4 | 0.02 |
| 木制品 | 2.1 | 0.05 |
| 玻璃 | 3 | 1×10-9 |
| 金属制品 | 1 | 1×107 |
| 塑料制品 | 2 | 1×10-7 |
), ArticleFig(id=1251458179247321515, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=表1, caption=
元件材料的电磁参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 材料 | 相对介电常数εr | 电导率σ/(S/m) |
|---|
| 混凝土 | 6 | 0.01 |
| 石膏板墙 | 4 | 0.02 |
| 木制品 | 2.1 | 0.05 |
| 玻璃 | 3 | 1×10-9 |
| 金属制品 | 1 | 1×107 |
| 塑料制品 | 2 | 1×10-7 |
), ArticleFig(id=1251458179347984815, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Tab.2, caption=
RT simulation parameters based on BLE signals
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 值 |
|---|
| 载波频率fc/GHz | 2.4 |
| 带宽B/MHz | 2 |
| 发射/接收端天线辐射模式 | 全向 |
| 最大反射次数 | 3 |
| 最大绕射次数 | 2 |
| BLE数据包格式 | LE1M |
| 符号率/MHz | 1 |
| 采样率/MHz | 8 |
| BLE数据包长度 | 256 |
| BLE信标输出功率/dBm | 0 |
| 载波频率fc/GHz | 2.4 |
), ArticleFig(id=1251458179452842418, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=表2, caption=
基于BLE信号的RT仿真参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 值 |
|---|
| 载波频率fc/GHz | 2.4 |
| 带宽B/MHz | 2 |
| 发射/接收端天线辐射模式 | 全向 |
| 最大反射次数 | 3 |
| 最大绕射次数 | 2 |
| BLE数据包格式 | LE1M |
| 符号率/MHz | 1 |
| 采样率/MHz | 8 |
| BLE数据包长度 | 256 |
| BLE信标输出功率/dBm | 0 |
| 载波频率fc/GHz | 2.4 |
), ArticleFig(id=1251458179536728503, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Tab.3, caption=
Hyperparameters of the VAE-CNN
, figureFileSmall=null, figureFileBig=null, tableContent=
| 超参数 | 参数值 |
|---|
| 输入尺寸 | 1×6×1 |
| 卷积层 | 1×2卷积核,步长为1 |
| 维度 | 64 |
| 激活函数 | ReLU |
| 卷积层数量 | 2 |
| 优化器 | Adam |
| 学习率 | 0.001 |
| Dropout比率 | 0.5 |
| 批量大小 | 100 |
| 训练周期 | 500 |
), ArticleFig(id=1251458179645780413, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=表3, caption=
VAE-CNN模型超参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 超参数 | 参数值 |
|---|
| 输入尺寸 | 1×6×1 |
| 卷积层 | 1×2卷积核,步长为1 |
| 维度 | 64 |
| 激活函数 | ReLU |
| 卷积层数量 | 2 |
| 优化器 | Adam |
| 学习率 | 0.001 |
| Dropout比率 | 0.5 |
| 批量大小 | 100 |
| 训练周期 | 500 |
), ArticleFig(id=1251458179738055107, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Tab.4, caption=
Positioning performance metrics
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| 误差指标 | RMSE | STD |
|---|
| PDR | 6.83 | 2.97 |
| BLE测距 | 10.41 | 4.46 |
| BLE指纹 | 7.15 | 3.56 |
| EKF | 4.73 | 2.34 |
| 测距修正的BLE | 2.42 | 1.53 |
| 测距修正的EKF | 0.81 | 0.28 |
), ArticleFig(id=1251458179805163976, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=表4, caption=
定位性能指标
, figureFileSmall=null, figureFileBig=null, tableContent=
| 误差指标 | RMSE | STD |
|---|
| PDR | 6.83 | 2.97 |
| BLE测距 | 10.41 | 4.46 |
| BLE指纹 | 7.15 | 3.56 |
| EKF | 4.73 | 2.34 |
| 测距修正的BLE | 2.42 | 1.53 |
| 测距修正的EKF | 0.81 | 0.28 |
), ArticleFig(id=1251458179876467147, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Tab.5, caption=
RMSE metrics for different numbers of beacons
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| RMSE | 5信标 | 6信标 | 8信标 |
|---|
| BLE测距 | 24.38 | 15.76 | 10.41 |
| BLE指纹 | 12.73 | 8.54 | 7.15 |
| EKF | 10.46 | 6.92 | 4.73 |
| 测距误差修正的BLE定位 | 4.36 | 3.76 | 2.42 |
| 测距误差修正的EKF定位 | 2.07 | 1.23 | 0.81 |
), ArticleFig(id=1251458179947770318, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=表5, caption=
不同信标数量下的RMSE指标
, figureFileSmall=null, figureFileBig=null, tableContent=
| RMSE | 5信标 | 6信标 | 8信标 |
|---|
| BLE测距 | 24.38 | 15.76 | 10.41 |
| BLE指纹 | 12.73 | 8.54 | 7.15 |
| EKF | 10.46 | 6.92 | 4.73 |
| 测距误差修正的BLE定位 | 4.36 | 3.76 | 2.42 |
| 测距误差修正的EKF定位 | 2.07 | 1.23 | 0.81 |
), ArticleFig(id=1251458180014879187, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=EN, label=Tab.6, caption=
STD metrics for different numbers of beacons
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| STD | 5信标 | 6信标 | 8信标 |
|---|
| BLE测距 | 10.45 | 6.61 | 4.46 |
| BLE指纹 | 6.36 | 4.78 | 3.56 |
| EKF | 5.93 | 3.72 | 2.34 |
| 测距误差修正的BLE定位 | 2.78 | 1.95 | 1.53 |
| 测距误差修正的EKF定位 | 1.82 | 1.36 | 0.28 |
), ArticleFig(id=1251458180094570964, tenantId=1146029695717560320, journalId=1251194880429441115, articleId=1251458158766535421, language=CN, label=表6, caption=
不同信标数量下的STD指标
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| STD | 5信标 | 6信标 | 8信标 |
|---|
| BLE测距 | 10.45 | 6.61 | 4.46 |
| BLE指纹 | 6.36 | 4.78 | 3.56 |
| EKF | 5.93 | 3.72 | 2.34 |
| 测距误差修正的BLE定位 | 2.78 | 1.95 | 1.53 |
| 测距误差修正的EKF定位 | 1.82 | 1.36 | 0.28 |
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