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Optimal Tracking and Guidance Method for Martian Atmosphere Entry Trajectory

A technology for entering the segment and Mars, applied in the field of deep space exploration, can solve the problems of reducing the efficiency of guidance law solution and lack of technology, so as to improve the solution efficiency and realize the effect of real-time online guidance

Active Publication Date: 2020-04-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

Since the predictive-correction guidance method requires repeated integration of the dynamics, the efficiency of the guidance law solution is reduced, and in terms of process constraint satisfaction, the predictive-correction guidance method still lacks perfect technology, especially for the small lift-to-drag ratio of the Martian atmosphere entry section detector

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Embodiment Construction

[0065] In order to better illustrate the purpose and advantages of the present invention, the content of the invention will be further described below in conjunction with the accompanying drawings and implementation examples.

[0066] This example is aimed at the trajectory tracking problem of the Martian atmosphere entry section. Based on the small disturbance assumption and convex programming theory, SeDuMi is used to optimize the control correction amount in the trajectory tracking process.

[0067] The optimal tracking and guidance method for the trajectory of the Martian atmosphere entering section disclosed in this embodiment is as follows: figure 1 As shown, the specific steps are as follows:

[0068] Step 1. Establish the longitudinal dynamics model of the Mars atmosphere entry section detector;

[0069] In the inertial coordinate system of Mars, ignoring the rotation of Mars, take the motion state of the probe in the longitudinal plane as x=[r,γ,s] T , where r is th...

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Abstract

The invention discloses an optimal trajectory tracking guidance method for Mars atmospheric entry phase, belonging to the field of deep space exploration. The realization method of the invention comprises the follow steps: (1) establishing a longitudinal dynamic model of a Mars atmospheric entry stage probe; (2), performing convexification processing on the path constraint and the control constraint, and selecting the quadratic performance index to establish a trajectory optimal trajectory tracking problem model; (3), discretizing that trajectory optimal tracking problem model in the step (2),converting the model into a quadratic programming problem, so that the problem can be solved in polynomial time by an interior point method, the discretized quadratic programming problem can be solved by a numerical method, the solution efficiency is improved, and the real-time online guidance of the Martian atmosphere entry section is realized. The invention converts the trajectory tracking guidance problem into an optimal control problem for solving, and the parachute opening accuracy can be improved.

Description

technical field [0001] The invention relates to an optimal tracking and guidance method for the trajectory of the Mars atmosphere entry section, belonging to the field of deep space exploration. Background technique [0002] Considering the safety of landing and the value of scientific exploration, NASA proposed that the key technology for future Mars landing missions is precise landing. So far, seven probes have successfully landed on the surface of Mars. The landing process of these probes follows the landing plan of Viking, which is divided into atmospheric entry section, parachute section, power descent section and final landing section. The atmospheric entry stage is an important stage of the landing process, and its navigation and guidance accuracy have a decisive impact on the final landing accuracy. Among the previous secondary landing exploration missions, only the Mars Science Laboratory mission adopted a closed-loop guidance and control scheme in the atmosphere e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B64G1/24
CPCB64G1/242
Inventor 崔平远高锡珍朱圣英徐瑞高艾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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