Terrain Following, Terrain Avoidance, Threat Avoidance (TF-TA 2) real-time trajectory planning is one of the key technologies of the autonomous TF-TA 2 low-altitude penetration system. Based on the digital map preprocessing technology, this paper proposes the concept of safety surface, so that the three-dimensional optimal trajectory planning is transformed into a two-dimensional planning on the safety surface, which reduces the planning dimension, reduces the storage and calculation amount, and improves the speed of real-time trajectory planning, making it more suitable for implementation under airborne conditions. At the same time, this paper proposes a method for processing obstacles and threats that are not predicted but measured by airborne sensors, so that the optimal trajectory can effectively avoid these obstacles and threats. Simulation results show that the real-time trajectory planning algorithm proposed in this paper is effective. Keywords: Terrain Following; Terrain Avoidance; Digital Map; Threat Avoidance; Trajectory Planning
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