Full-firing-direction autonomous reentry guidance method based on three-dimensional reentry trajectory analytical solution

Abstract

The invention discloses a full-firing-direction autonomous reentry guidance method based on a three-dimensional reentry trajectory analytical solution. The full-firing-direction autonomous reentry guidance method comprises the following steps of 1, building of a kinematical equation and a dynamical equation, 2, summarizing of the reentry guidance method, 3, descent stage guidance strategies, 4, steady gliding stage guidance strategies and 5 height-adjustment stage guidance strategies. The full-firing-direction autonomous reentry guidance method has the advantages that reentry guidance of an aircraft with the large lift-drag ratio can be guided effectively, low-damping and long-period trajectory oscillation caused by the high lift-drag ratio can be restrained effectively, the peak value ofthe heat flux density is reduced, and tracking of a reference track is facilitated; inertia force caused by earth rotation and actual aerodynamic force are combined into equivalent aerodynamic force,an equivalent aerodynamic section is planned through the analytical solution, and thus the aircraft has the omni-directional reentry task processing capability; and an equivalent aerodynamic section fitting formula based on the inverse proportional function is put forward, the reentry trajectory analytical solution based on the complex equivalent aerodynamic section form is further deduced, and thus high precision, all-dimensional applicability and high robustness are achieved.

Description

technical field [0001] The invention relates to a full-firing autonomous re-entry guidance method based on an analytical solution of a three-dimensional re-entry trajectory, belonging to the fields of aerospace technology, weapon technology, and guidance control. Background technique [0002] CAV is a hypersonic gliding vehicle with a high lift-to-drag ratio, with a lift-to-drag ratio as high as 3. In contrast, the lift-to-drag ratio of conventional reentry vehicles is only about 1, such as the space shuttle and X-33RLV. The high lift-to-drag ratio enables the CAV to have a longer gliding distance and a wider lateral maneuvering range during the reentry phase. During the re-entry phase, the gliding altitude of the aircraft is between 20km-100km, and the Mach number gradually decays from 20 to around 6. Different from the homing guidance method, the re-entry guidance method used in this stage not only guides the aircraft to the target, but also needs to dissipate the flight...

AI Technical Summary

Problems solved by technology

[0005] Yu W., Chen W., Entry guidance with real-time planning of reference based on analytical solutions[J].Advances in Space Research,2015,55(9):2325–2345 developed a three-dimensional reentry trajectory analysis solution, and then used This analytical solution designs a re-entry guidance method that can plan the reference trajectory by itself, which is denoted as EGAS. However, after in-depth research, it is found that the three-dimensional re-entry trajectory analytical solution does not consider the influence of the earth's rotation, and the trajectory planning does not take this into account. fully compensated for impacts, EGAS cannot handle missions in all directions of flight, especially missions along the north-south direction

Images