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This work was supported by National Natural Science Foundation of China (Grant Nos. 61673341, 61573091, 61622308, 61873206), National Key R&D Program of China (Grant No. 2016YFD0200701-3), and Open Research Project of the State Key Laboratory of Industrial Control Technology, Zhejiang University, China (Grant No. ICT1800421).
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Liu, Y., Zhang, Y., Li, P. et al. Uncalibrated downward-looking UAV visual compass based on clustered point features. Sci. China Inf. Sci. 62, 199202 (2019). https://doi.org/10.1007/s11432-018-9748-1