A multi-node synchronous baseline calibration system based on vision measurement for DPOS

摘要

A distributed position and orientation system (DPOS) can provide abundant time-spatial information for multi-task imaging loads in the airborne earth observation system. To ensure that DPOS meets the engineering requirement, it must be accurately calibrated on the ground before DPOS can be applied to aerial remote sensing, especially baseline calibration, for which the measurement accuracy of the baseline is a key technical indicator that affects imaging accuracy. However, it is difficult to achieve baseline calibration between multiple nodes synchronously because of external interference, and there is no baseline calibration method for DPOS yet. To solve the problem mentioned above, considering the advantages of vision measurement, this paper presents a multi-node synchronous baseline calibration system for DPOS. In order to evaluate the effectiveness of the proposed system, a verification test was conducted. The measurement result of a theodolite coordinate measurement system (TCMS) is the benchmark. Under static conditions, the experimental results show that baseline measurement accuracy is better than 0.3mm.