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Longitudinal on-line locus designing and tracking method for reentry initial segment analytic expression

A trajectory design and analytical technology, applied in the direction of aerospace vehicle guidance devices, etc., can solve the problems of not being able to adapt to shift deviations and low guidance precision, and achieve the effects of improving guidance precision, overcoming environmental errors and modeling errors, and reducing pressure

Active Publication Date: 2014-02-19
BEIJING LINJIN SPACE AIRCRAFT SYST ENG INST +1
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Problems solved by technology

This method is suitable for powered aircraft. For unpowered re-entry aircraft, since its guidance is performed by adjusting drag acceleration, the guidance accuracy of this method is low, and it cannot adapt to large shift deviations

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  • Longitudinal on-line locus designing and tracking method for reentry initial segment analytic expression
  • Longitudinal on-line locus designing and tracking method for reentry initial segment analytic expression
  • Longitudinal on-line locus designing and tracking method for reentry initial segment analytic expression

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Embodiment Construction

[0046] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0047] The invention overcomes the deficiency of the existing LQR tracking technology, and proposes an analytic longitudinal online trajectory design and tracking method for the initial section of the reentry aircraft. According to the kinematics and dynamics characteristics of the high-speed re-entry vehicle flying in the rarefied flow, through the appropriate simplification and derivation of its motion equation, and based on the assumption that the speed change in the rarefied flow has little influence on the kinematics, the initial handover is obtained Analytical online trajectory with strong self-adaptive ability, and based on optimal control theory, the tracking law of analytical online trajectory is designed to overcome environmental errors and modeling errors, and improve terminal guidance accuracy.

[0048] In the initial stage of re-e...

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Abstract

The invention relates to a longitudinal on-line locus designing and tracking method for a reentry initial segment analytic expression. Defects of an existing LQR tracking technology are overcome, and according to kinematics and kinetics characteristics of a high-speed reentry vehicle flying in rarefied flows, an analytic expression on-line locus which is high in adaptive ability for initial shift deviation is obtained on the basis of the hypothesis that speed changes have little influence on kinematics in the rarefied flows by appropriately simplifying and deducing a motion equation of the reentry vehicle. Moreover, on the basis of the optimal control theory, the analytic expression on-line locus is subjected to tracking law design, environmental errors and modeling errors are overcome, and terminal guidance accuracy is improved.

Description

technical field [0001] The present invention relates to an analytic longitudinal online trajectory design and tracking method at the initial stage of re-entry, in particular to an analytic online trajectory design method for an unpowered re-entry vehicle in a thin flow. The trajectory has a significant effect on the initial shift deviation Strong adaptive ability. Background technique [0002] During the reentry process of aerospace vehicles, the flight missions are diverse, the maneuvering range is large, the flight environment is complex, and the mechanical and thermal constraints are relatively strong, which leads to the following difficulties in trajectory optimization and guidance: 1. Large parameter uncertainty; 2. Shift deviation 3. Guidance design constraints are strong. [0003] The traditional LQR (Linear Quadratic Regulation) tracking guidance method performs small disturbance linearization near the nominal trajectory. In the case of large initial shift deviation...

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Application Information

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IPC IPC(8): B64G1/24
Inventor 季登高黄兴李郭振西谢佳武斌王军权
Owner BEIJING LINJIN SPACE AIRCRAFT SYST ENG INST
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