Engineering reentry guidance method for variable center of mass vehicle
A technology of re-entry guidance and aircraft, applied in the field of re-entry guidance of variable center of mass aircraft, can solve problems such as poor engineering applicability, and achieve the effect of ballistic lift and drop, and strong robust characteristics
Active Publication Date: 2021-05-07
NORTHWESTERN POLYTECHNICAL UNIV
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0041] refer to Figure 1-2 . The specific steps of the engineering re-entry guidance method for the variable center of mass aircraft of the present invention are as follows:
[0042] 1. The proportional guidance law is augmented.
[0043] Define the ground coordinate system as ex e the y e z e (abbreviated as e): the origin e is the projection point of the center of mass o of the aircraft at the initial moment on the ground; ey e at the center of the earth E On the connection line with the center of mass o of the aircraft, pointing to the center of mass o of the aircraft is positive; while ex e perpendicular to ey at point e e In the plane of , pointing to the target point; ex e the y e z e Form a right-handed Cartesian coordinate system.
[0044] Define the line of sight coordinate system oξ o n o z o (abbreviated as S): the origin is at the center of mass o of the aircraft; oξ o From the center of mass of the aircraft to the target point; oζ o In the horizon...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses an engineered reentry guidance method for a variable center of mass aircraft, which is used to solve the technical problem of poor engineering applicability of the existing variable center of mass aircraft reentry guidance method. The technical solution is based on the most common proportional guidance law in engineering, transforming the falling speed and fall angle constraints of the variable center of mass aircraft into an augmented term, and further performing a robust dimension expansion design on the parameters of the augmented term, so that the guidance parameter is variable center of mass The function of the flight state deviation of the aircraft ensures the guidance accuracy when the center-of-mass aircraft is disturbed, and finally determines the guidance command based on the relationship between the required overload and the available overload, that is, the size of the roll angle command. On the basis of the proportional guidance law, the present invention adds an augmented term that considers the constraints of the fall angle and the fall speed, realizes ballistic lift and drop, and ensures that the fall angle and fall speed constraints are satisfied at the same time. Rod extension design is a strong robust guidance method for variable center of mass aircraft with simple form and good engineering application performance.
Description
technical field [0001] The invention relates to a reentry guidance method for a variable center of mass aircraft, in particular to an engineered reentry guidance method for a variable center of mass aircraft. Background technique [0002] A one-dimensional variable center of mass vehicle usually adopts a fixed trim design, which is a simple and easy-to-implement reentry vehicle configuration. The fixed-trim aircraft uses its own static stability to achieve self-stabilization of pitch and yaw motions, and only needs to control the roll channel to realize maneuvering flight. However, in the roll single-channel control mode, the aircraft overload is only controllable in direction and uncontrollable in magnitude, which brings challenges to the strong robust guidance of fixed-trim variable center-of-mass aircraft constrained by falling speed and angle. [0003] Aiming at the guidance problem of fixed-trim variable center of mass aircraft with landing angular speed terminal const...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G05D1/08F42B15/01
CPCF42B15/01
Inventor 周敏周军葛振振赵金龙
Owner NORTHWESTERN POLYTECHNICAL UNIV