| Citation: | LIU Yang, XIANG Jinwu, LUO Zhangping, et al. Short-term conflict detection algorithm for free flight in low-altitude airspace[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(9): 1873-1881. doi: 10.13700/j.bh.1001-5965.2016.0687(in Chinese)
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Considering the autonomous route of free flight in low-altitude airspace, a probabilistic short-term conflict detection algorithm is proposed. The trajectory prediction error caused by navigation error, control error and wind disturbance was taken into account. A reasonable error model was constructed to compute the conflict probability between aircraft in the short term. By using coordinate transformation and extending the conflict zone, an approximate analytical expression was presented to estimate the conflict probability of maneuvering flight in three-dimensional airspace. By comparison with Paielli and Erzberger (P&E) approximation algorithm and the Monte Carlo simulation algorithm, the presented algorithm was proved to increase the accuracy of conflict probability estimation and decrease the computational consumption. The result shows that this algorithm can reach the real-time requirement of free flight in low-altitude airspace and realize the conflict detection in complex environment.
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