Abstract: After the long-term use, there will be the impact on the measurement accuracy and reliability of the mobile backpack-mounted scanning system, without no standard for system calibration and accuracy evaluation. The key technologies and performances indexes of backpack-mounted scanning system are studied. The comprehensive accuracy evaluation method is put forward. The homemade stereo reflection targets as feature points are distributed in an orderly way around the calibration pillars of Beijing standard length baseline field, and the comprehensive accuracy of the system is evaluated and analyzed by comparing the scanning measurement values of target characteristic points with the standard values. The experimental results show that the plane accuracy of the system is better than 3 cm and the elevation accuracy is better than 2 cm, which provides a reliable basis for the accuracy evaluation and reliability application of the backpack-mounted scanning system.

Key words: backpack-mounted scanning system, stereo reflection targets, comprehensive calibration, accuracy evaluation