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Acta Armamentarii ›› 2021, Vol. 42 ›› Issue (1): 159-166.doi: 10.3969/j.issn.1000-1093.2021.01.018

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Integrated Navigation Algorithm of Depth Camera/MEMS IMU

ZHANG Fubin1, LIN Jiayun2   

  1. (1.School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710129, Shaanxi, China; 2.Hunan Aerospace Electromechanical Equipment and Special Material Research Institute, Changsha 410200, Hunan, China)
  • Online:2021-03-11

Abstract: GPS, radio positioning and other positioning methods are difficult to use in the indoor environment. Wheel odometer is easy to slip or idle in stairs and other occasions. Single vision sensor or micro-electromechanical system (MEMS) inertial measurement unit (IMU) is difficult to achieve high-precision autonomous positioning. The traditional vision/MEMS IMU integrated navigation algorithm is complex, computationally expensive and of low accuracy. In order to solve these problems, a loose coupled navigation algorithm based on depth camera/MEMS IMU is proposed for indoor application. The pre-integration results of MEMS IMU are used as the initial value of the iterative closest point (ICP) algorithm, which greatly reduces the number of iterations. The position of a carrier is calculated by depth camera and MEMS IMU, respectively. The position difference is obtained by subtracting the two positions. The errors of MEMS IMU is estimated and the result of dead reckoning is corrected by using the position difference as the measuring information of EKF. The results of experiments with Kinect v1 and MTI 100-IMU show that the improved ICP algorithm based on MEMS IMU can effectively reduce the number of iterations by about 50%. The depth camera/MEMS IMU loose coupled algorithm based on position difference can make the position errors less than 10% of the total mileage.

Key words: depthcamera, inertialmeasurementunit, iterativeclosestpoint, integratednavigation

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