Method for monitoring height of return capsule of manned spacecraft by fusing GPS (Global Positioning System) and barometric altitude

Abstract

The invention belongs to the technical field of manned spacecraft recovery landing height monitoring methods, and particularly relates to a method for monitoring the height of a manned spacecraft reentry capsule by fusing a GPS (global positioning system) and an air pressure height. The atmospheric pressure change returning to the outside of the capsule is sensed through a pressure sensor and converted into height, and the height and the height and speed information obtained by a GPS receiver serve as observation variables; data fusion processing is carried out on observation variables through extended Kalman filtering, the fused height h is obtained, the accuracy and reliability of height information are remarkably improved, the height and the attitude of a return capsule are comprehensively considered in brake parachute opening and separation control, and the reliability of the brake parachute is improved. The oscillation amplitude of the reentry capsule during the period from the opening of the brake parachute to the opening of the main parachute and the occurrence probability of the situation unfavorable for the opening of the main parachute are reduced, so that the overall control reliability is improved.

Description

technical field [0001] The invention relates to the technical field of a landing height monitoring method for a manned spacecraft, in particular to a method for monitoring the height of a manned spacecraft return cabin by integrating GPS and barometric altitude. Background technique [0002] Parachute opening altitude control is a key link in recovery landing control. The patent CN202110979382.7 "A Control Algorithm for Deceleration Parachute Opening and Separation of Manned Spaceship Return Module" previously applied by the applicant discloses the control algorithm of deceleration parachute opening and separation of the attitude angle, and the enabling window of the algorithm It can be a time window or a height window. If it is a time window, it is necessary to set the opening and closing time of the window according to the pre-calculated trajectory. Since the return orbit of the semi-ballistic aircraft has certain maneuverability, this method is not flexible enough; and t...

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Problems solved by technology

[0003] At present, the recovery landing control system uses the static pressure altitude controller to send a control signal when the predetermined pressure value is reached to achieve altitude control. Due to the variable dynamic pressure correction, the accurate altitude can only be output at a specific, corrected altitude value; while the GPS system has a small error, but the signal is easily blocked, so it cannot be used as a reliable altitude input

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