Systems Engineering and Electronics ›› 2024, Vol. 46 ›› Issue (12): 4157-4164.doi: 10.12305/j.issn.1001-506X.2024.12.24

• Guidance, Navigation and Control • Previous Articles    

UAV online trajectory planning based on improved RRT* algorithm

Haikuo ZHANG, Xiuyun MENG   

  1. School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
  • Received:2024-01-15 Online:2024-11-25 Published:2024-12-30
  • Contact: Haikuo ZHANG

Abstract:

In order to solve the problems of low sampling efficiency, slow convergence speed and high trajectory cost when the rapidly-exploring random tree (RRT)* algorithm is applied to unmanned aerial vehicle (UAV) trajectory planning, the potential field method is used to guide the tree expansion to accelerate the convergence speed of the algorithm. The optimization algorithm is applied to reselect the parent node and reroute the process to generate the initial trajectory with the cost which is reduced comparing with the cost of the RRT* algorithm. The heuristic sampling area is constructed based on the initial trajectory to optimize the initial trajectory more effectively, and an improved RRT* algorithm is proposed. Based on model predictive control (MPC), a trajectory planning strategy is designed to enable the UAV to respond well to dynamic threats in the environment during flight. Mathematical simulation results show that the improved algorithm can quickly generate an initial trajectory with less cost, and reduce the trajectory cost in the subsequent trajectory optimization process more effectively, which can be applied to the online planning task of UAV.

Key words: trajectory planning, RRT* algorithm, model predictive control (MPC), potential field

CLC Number: 

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