To deal with the low accuracy of positioning for mobile robots when only using visual sensors and an IMU, a method based on\ntight coupling and nonlinear optimization is proposed to obtain a high-precision visual positioning scheme by combining\nmeasured value of the preintegrated inertial measurement unit (IMU) and values of the odometer and characteristic observations.\nFirst, the preprocessing part of the observation data includes tracking of the image data and the odometer data, and preintegration\nof IMU data. Second, the initialization part of the above three sensors includes IMU preintegration, odometer preintegration, and\ngyroscope bias calculation. It also includes the alignment of speed, gravity, and scale. Finally, a local BA (bundle adjustment) joint\noptimization and global graph optimization are established, so as to obtain more accurate positioning results.
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