Improved tentacle-based method based on approximate analysis for entry flight

Aiming at the no-fly zone constraint in the process of aircraft gliding reentry, this paper presents an improved strategy for tentacle-based detection. The turning radius and reference pitch angle of the aircraft can be obtained by approximate analytical solution and then the waypoint can be obtained according to geometric relationship. Next tentacle-based method is used to correct the trajectory to meet the flight requirements. By approximate analytical solution programming, the number of tentacles required can be reduced, and the influence of integration process on the calculation efficiency can be reduced, thus the calculation time can be shortened effectively. After the no-fly zone is bypassed, height planning is performed to meet the terminal height constraints. The simulation results show that this method can effectively avoid the no-fly zone and satisfy various constraints of gliding reentry process, and The calculation time is shortened to 22.24%.