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| 基于射频相位的两步测距法 | |
| 引用本文： | 赵阳,黄建尧,刘德亮,刘开华,马永涛. 基于射频相位的两步测距法[J]. 计算机应用, 2015, 35(7): 1833-1836. DOI: 10.11772/j.issn.1001-9081.2015.07.1833 |
| 作者姓名： | 赵阳 黄建尧 刘德亮 刘开华 马永涛 |
| 作者单位： | 1. 天津大学 电子信息工程学院, 天津 300072;2. 天津七一二通信广播有限公司, 天津 300462;3. 军械工程学院 导弹工程系, 石家庄 050003 |
| 基金项目： | 国家自然科学基金资助项目(61401301);天津市科技支撑计划重点项目(13ZCZDGX02800)。 |
| 摘 要： | 针对多径传播造成基于射频信号相位信息测距不准确问题,提出了一种基于双标签的两步测距法。每一待定位目标上附着两个标签。在单频副载波调幅调制方式下,首先,提取载波信号的卷叠相位信息,计算标签在载波半波长范围内与阅读器的距离值,得到细测距估计值;然后,提取副载波信号的展开相位信息,根据展开相位估计标签与阅读器相距距离中包含的载波半波长的整倍数;其次,计算两个标签对应整倍数的平均值,将该平均值倍的载波半波长距离作为两个标签与阅读器之间距离的粗测距估计值;最后,将粗测距与细测距的估计值相叠加得到双标签最终的测距估计值。另外,为了降低硬件设施成本,提出了基于单阅读器和双标签的几何定位方法。仿真实验结果表明,在复杂多径传播环境中,与直接基于副载波信号相位信息测距相比,基于双标签的两步测距法平均测距误差约降低了35%,最终平均定位误差约为0.43 m,最大误差约为1 m,有效提高了相位法在定位技术中的精度,并降低了硬件成本。 |
| 关 键 词： | 超高频射频识别 射频相位 整周期模糊 多径传播环境 双标签 |
| 收稿时间： | 2015-01-30 |
| 修稿时间： | 2015-03-30 |
Radio phase-based two-step ranging approach |
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| ZHAO Yang,HUANG Jianyao,LIU Deliang,LIU Kaihua,MA Yongtao. Radio phase-based two-step ranging approach[J]. Journal of Computer Applications, 2015, 35(7): 1833-1836. DOI: 10.11772/j.issn.1001-9081.2015.07.1833 | |
| Authors: | ZHAO Yang HUANG Jianyao LIU Deliang LIU Kaihua MA Yongtao |
| Affiliation: | 1. School of Electronic Information Engineering, Tianjing University, Tianjin 300072, China; 2. Tianjin 712 Communication and Broadcasting Corporation, Tianjin 300462, China; 3. Department of Missile Engineering, Ordnance Engineering College, Shijiazhuang Hebei 050003, China |
| Abstract: | Concerning the ranging inaccuracy problem based on radio signal phase information under multi-path environments, a two-step ranging approach based on double tags was proposed. Each target was attached with double tags. Through single frequency subcarrier amplitude modulation, firstly, the wrapped phase information of carrier signal was extracted, the distance between reader and tag within half wavelength of carrier signal was calculated and fine ranging estimation value was achieved. Secondly, the unwrapped phase information of subcarrier signal was extracted, and the integral multiple of half wavelength within the distance of reader and tag was calculated. Thirdly, the average multiple was calculated between double tags, the distance of average multiple of half wavelength was used as coarse ranging value. Finally, the final ranging result was estimated by the sum of the fine ranging value and coarse ranging value. Additionally, single reader and double-tag based geometric localization method was introduced to reduce the cost of hardware facilities. The simulation results show that, under multi-path environments, compared with the directly ranging with subcarrier phase, the average ranging error of double tags based two-step ranging approach is reduced by 35%, and the final average localization error is about 0.43 m, and the maximum error is about 1 m. The proposed approach can effectively improve the accuracy of phase based localization technology and also reduce the hardware cost. |
| Keywords: | Ultra-High Frequency Radio Frequency Identification (UHF RFID) radio phase whole-cycle ambiguity multi-path propagation environment double tags |
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