A high-precision optimization method for jumping reentry trajectories

Abstract

The invention discloses a high-precision optimization method for a jumping reentry trajectory, which belongs to the technical field of aircraft design. This method firstly optimizes the jump reentry trajectory as a whole to obtain the optimal control variable, and then integrates the reentry dynamics equation according to the optimized control variable. When the integration reaches the highest point of the elliptical trajectory, the secondary reentry trajectory Re-optimize. The invention reduces the sensitivity of the secondary reentry trajectory to the error of the first reentry trajectory by introducing a secondary optimization strategy at the highest point of the elliptical trajectory of the jumping reentry trajectory, so that the terminal constraints of the trajectory are accurately satisfied. In addition, the method can continue to provide control instructions for the aircraft during the second optimization period. This quasi-online optimization strategy makes the method have engineering applicability. The method provided by the invention can be used in the fields of optimal design of jumping reentry trajectory of deep space exploration aircraft, guidance control and the like.

Description

technical field [0001] The invention belongs to the technical field of aircraft design, and relates to a trajectory optimization method for jumping re-entry of an aircraft. Background technique [0002] Reentry and return technology is one of the key stages and difficulties of manned space flight. Compared with returning from low-Earth orbit, the speed of deep space exploration vehicle re-entry and returning to the earth is greater. For example, the return speed of the lunar probe is as high as 11km / s, and the return speed of the Mars probe is as high as 14.5km / s. For such a high return speed, if the aircraft uses direct re-entry to return to the earth, the maximum overload during the re-entry process is as high as 17 or more, which is far beyond the ability of human beings. Skip reentry is an effective way to reduce maximum overload. as attached figure 1 As shown, the aircraft enters the atmosphere with a small re-entry angle, uses the lift provided by the atmosphere whi...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention reduces the sensitivity of the second reentry trajectory to the error of the first reentry trajectory by introducing a secondary optimization strategy at the highest point of the elliptical trajectory of the jumping reentry trajectory, enabling trajectory optimization The terminal constraints of the problem are accurately satisfied, which solves the problem of low precision in jump reentry trajectory optimization, and the secondary optimization is quasi-online optimization, which has good engineering application value

Images