Mars Powered Descent Trajectory Planning Method Based on Vector Trajectory

Abstract

The invention discloses a Mars power descending trajectory planning method based on a vector trajectory, and belongs to the technical field of deep space detection. The realization method comprises the following steps: on the basis of determining marks power descending burnup optimal performance indexes and constraint conditions, the vector processing is performed on kinetic equations, camera field angle constraints and geometric convex trajectory constraints, and the discretization is performed on position, speed and acceleration variables, the performance indexes and the constraint conditions; inequality constraints and control constraints are converted to a second-order cone constraint form, so that the trajectory planning problem is converted to the second-order cone planning problem;the second-order cone planning problem is solved to realize landing in a target landing point; the camera field angle constraints and the geometric convex trajectory constraints are met; and meanwhile, the trajectory planning method achieves instantaneity and convergence. The method can effectively guarantee the visibility of obstacles in a landing area by a navigation camera, and applies the geometric convex trajectory constraints to improve the avoidance capacity of the obstacles around the landing point.

Description

technical field [0001] The invention relates to a power descent trajectory planning method, in particular to a Mars power descent trajectory planning method based on a vector trajectory, and belongs to the technical field of deep space exploration. Background technique [0002] Accurate and safe landing on the surface of Mars is the technical prerequisite for in-situ detection of the surface of Mars, sample return and other scientific exploration tasks. In order to obtain rich scientific returns, future Mars landers will inevitably land in complex terrain areas, which poses challenges to the lander's ability to avoid complex obstacles and landing safety. [0003] The obstacle avoidance technology of the landing trajectory planning method is an important technology to ensure the landing safety of the lander in complex terrain areas. Trajectory curvature is an important factor affecting the effect of obstacle avoidance, and the landing convex trajectory has a significant adva...

AI Technical Summary

Problems solved by technology

In order to obtain rich scientific returns, future Mars landers will inevitably land in complex terrain areas, which poses challenges to the lander's ability to avoid complex obstacles and landing safety

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