Planet safe landing guidance method employing landing point on-line selection

Abstract

The invention discloses a planet safe landing guidance method employing landing point on-line selection, relates to planet safe landing guidance methods, and belongs to the technical field of deep space detection. The method comprises the following steps: step 1, after a maneuverability boundary is obtained, intersecting a maneuverability covered area and sensor visual field, and taking the intersection scope as a safe landing point selection scope; step 2, acquiring landform safety, landing speed and burnup information on line in real time, and selecting a safe landing point by comprehensively considering the safe-landing-point selection indexes such as landform safety, landing speed and burnup; and step 3, transferring a detector to the new landing point through an on-line sliding-mode guidance method. The method is capable of effectively solves external disturbance and non-modeling error during landing, effectively avoiding danger areas, realizing landing in a safe area at an extremely small landing speed and less burnup, improving the safety and the reliability of a planet landing task, and provides technology support and reference for planet landing tasks.

Description

technical field [0001] The invention relates to a planetary safe landing guidance method, in particular to a planetary safe landing guidance method for online selection of landing points, and belongs to the technical field of deep space exploration. Background technique [0002] Due to the limited accuracy of planetary surface information that can be obtained from the ground, smaller-sized obstacles can only be accurately obtained when they are relatively close to the planetary surface, and the actual state of the probe may There is a large deviation from the nominal state, resulting in the probe being unable to accurately arrive at the scheduled landing point or complex terrain around the scheduled landing point that is not conducive to landing. The traditional obstacle detection and avoidance method focuses on the analysis of terrain obstacles, ignoring the impact of the landing process on the safety of the landing mission; in the method of selecting the landing point, the...

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Problems solved by technology

[0002] Due to the limited accuracy of planetary surface information that can be obtained from the ground, smaller-sized obstacles can only be accurately obtained when they are relatively close to the planetary surface, and the actual state of the probe may There is a large deviation from the nominal state, resulting in the probe being unable to accurately reach the scheduled landing point or complex terrain around the scheduled landing point that is not conducive to landing, etc.

The traditional obstacle detection and avoidance method focuses on the analysis of terrain obstacles, ignoring the impact of the landing process on the safety of the landing mission; in the method of selecting the landing point, there is a lack of analysis and discussion on the selection range and the selection index representation method; In the design of the guidance law, the robustness of the guidance method to the error and interference should also be considered

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