Precision analysis of aerial photogrammetry assisted by BeiDou PPK technology

doi:10.13474/j.cnki.11-2246.2022.0358

Abstract

Abstract: Due to the limitation of network signal and baseline length, the commonly used GPS real-time kinematics (RTK) technology cannot be applied to UAV aerial photogrammetry in areas such as the Arctic and Antarctic, offshore islands or reefs. Moreover, GPS is not our autonomous satellite navigation system, and cannot ensure permanent safety and reliability. To solve these problems, this article explores the use of our self-built BDS-3 to assist UAV photogrammetry through dynamic post-processing (PPK) technology. Taking DJI Phantom 4 RTK UAV as an example, the paper carries out PPK process of UAV POS data with BDS-3, GPS and BDS-3+GPS combined observation values. Then it analyzes the effects of different navigation satellite sources on the horizontal and elevation precision of UAV aerial photogrammetry in the absence of ground control points. The results show that after PPK calculation of the UAV POS data with BDS, GPS and BDS+GPS combination, the horizontal positioning precision is improved from decimeter level to centimeter level, and the elevation precision is improved from meter level to decimeter level or even centimeter level, which is equivalent to that of setting five ground control points. UAV aerial photogrammetry assisted by BDS PPK technology is able to meet the accuracy requirements of 1:500 scale aerial triangulation encryption precision in plain area.

Key words: BDS-3, PPK, UAV, photogrammetry, precision analysis

CLC Number:

P228.4

WANG Jing, WANG Zhaoyang, ZHANG Feng, ZHAO Xianren, GU Xianghui, JI Cheng. Precision analysis of aerial photogrammetry assisted by BeiDou PPK technology[J]. Bulletin of Surveying and Mapping, 2022, 0(12): 64-69.

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