测绘学报 ›› 2022, Vol. 51 ›› Issue (1): 18-30.doi: 10.11947/j.AGCS.2022.20200251

• 大地测量学与导航 • 上一篇    下一篇

基于抗差LM的视觉惯性里程计与伪卫星混合高精度室内定位

杨高朝1,2, 王庆1,2, 蔚保国3, 刘鹏飞1,2, 李爽3   

  1. 1. 东南大学仪器科学与工程学院, 江苏 南京 210096;
    2. 东南大学智慧城市研究院, 江苏 南京 210096;
    3. 卫星导航系统与装备技术国家重点实验室, 河北 石家庄 050050
  • 收稿日期:2020-07-17 修回日期:2021-11-11 发布日期:2022-02-15
  • 通讯作者: 王庆 E-mail:wq_seu@seu.edu.cn
  • 作者简介:杨高朝(1987-),男,博士生,研究方向为多传感器信息融合导航定位。E-mail:230189279@seu.edu.cn
  • 基金资助:
    国家重点研发计划(2020YFD110011-01)

High-precision indoor positioning based on robust LM visual inertial odometer and pseudosatellite

YANG Gaochao1,2, WANG Qing1,2, YU Baoguo3, LIU Pengfei1,2, LI Shuang3   

  1. 1. School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China;
    2. Smart City Research Institute, Southeast University, Nanjing 210096, China;
    3. State Key Laboratory of Satellite Navigation System and Equipment Techonlogy, The 54th Research Institute of China Electronics Technology Group Corporation, Shijiazhuang 050050, China
  • Received:2020-07-17 Revised:2021-11-11 Published:2022-02-15
  • Supported by:
    The National Key Research and Development Program of China (No. 2020YFD110011-01)

摘要: 视觉惯性里程计(VIO)和伪卫星已经广泛应用于室内环境定位中,但在实际应用中,二者各自都有明显的缺陷。视觉里程计依赖于实际场景,在景深变化明显和光照不均匀的环境下会产生粗差,而且误差会不可避免地随着时间累积,但是在相邻帧间能保证相对高精度的位姿测量。由于受到室内多径的影响,伪卫星室内定位的精度和可靠性很难保证。为增加室内定位的可靠性和稳定性,基于抗差LM非线性优化理论,本文主要研究利用视觉惯性里程计的相邻帧间高精度位姿测量和伪卫星融合的室内高精度定位技术。该算法不仅可以抵抗粗差,而且可以减弱不同传感器间权重设置不合理带来的影响。最后使用在室内环境下搭建的高精度动态捕捉设备对组合定位方法进行实验验证。试验结果表明,该方法不依赖回环即可消除视觉惯性里程计的累积误差,有效提高室内定位精度及可靠性。利用改进的LM算法融合后场景1和场景2,相对于VIO单独定位精度分别提高了59.0%和77.5%。

关键词: 视觉惯性里程计, 伪卫星, LM, 抗差估计, 室内定位

Abstract: Visual inertial odometer (VIO) and pseudo-satellite have been widely used in positioning indoors, but in practical applications, both approaches have their own limitations. The visual odometer depends on the actual positioning environments. Gross errors occur in environments with obvious changes in depth of field and uneven illumination, and errors will inevitably accumulate over time. However, relatively high-precision pose measurements can be obtained between adjacent frames. Due to the influence of indoor multipath, the accuracy and reliability of pseudolite indoor positioning are difficult to guarantee. To increase the reliability and stability of indoor positioning, based on the robust LM nonlinear optimization theory, this study mainly investigate indoor high-precision positioning technology approach of integrating high-precision pose measurements of VIO between adjacent frame and pseudolite. The algorithm can not only resist gross errors, but also reduce the influence of unreasonable weight settings among different sensors. Finally, the high-precision dynamic capture equipment built in the indoor environment is used to verify the proposed method. The experimental results show that the method can eliminate the cumulative error of the visual inertial odometer without relying on the loopback, and effectively improve the indoor positioning accuracy and reliability. Compared with the VIO, the positioning accuracy is improved by 59.0% and 77.5% respectively after using the improved LM algorithm for scenes 1 and 2.

Key words: visual inertial odometer, pseudosatellite, LM, robust estimation, indoor positioning

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