Adaptive segmentation multistage linear spectrum generalized standard control missdistance reentry guidance method

A technology of standard control miss amount and linear pseudospectrum, which is applied in the field of multi-segment linear pseudospectrum generalized standard control miss amount reentry guidance, and can solve problems such as errors, enhanced algorithms, and few terminal constraints

Active Publication Date: 2017-04-26
BEIHANG UNIV
View PDF7 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the assumption of quasi-equilibrium gliding, Shen and Lu developed a fast online planning algorithm to generate a feasible trajectory that satisfies the path constraints. However, the existing predictive correction algorithms use the traditional course error angle corridor to control the lateral trajectory. , high lift-to-drag ratio re-entry vehicle, this method will lead to a large lateral error, therefore, Shen studied the lateral guidance control strategy using the terminal lateral distance as the corridor, and improved the lateral guidance accuracy of medium lift-to-drag ratio aircraft
[0005] It should be pointed out that the time consumption of these predictive correction algorithms will increase exponentially wit...

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Adaptive segmentation multistage linear spectrum generalized standard control missdistance reentry guidance method
  • Adaptive segmentation multistage linear spectrum generalized standard control missdistance reentry guidance method
  • Adaptive segmentation multistage linear spectrum generalized standard control missdistance reentry guidance method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] The self-adaptive segmented multi-segment linear pseudo-spectrum generalized standard control off-target amount reentry guidance method, the specific steps are as follows:

[0094] (1) Initialization: Set the initial and terminal calculation simulation parameters, and obtain reasonable initial control parameters and segment time initial values ​​through offline ballistic optimization.

[0095] That is, initial modeling, as follows:

[0096] 1.) Reentry Kinetic Equation

[0097] Under the assumption of a sphere and a rotating Earth, the three-degree-of-freedom particle reentry dynamics equation can be expressed as

[0098]

[0099] Among them, all dynamical equations are derivatives of time, r represents the distance from the center of mass of the aircraft to the center of the earth, and the unit is m; θ and φ represent the longitude and latitude of the position of the aircraft, respectively, and the unit is °; Indicates the velocity of the aircraft relative to the ...

Embodiment 2

[0269] In this embodiment, the Monte Carlo simulation target shooting test considering model uncertainty and random pull bias will be used to verify the adaptive segmented multi-segment linear pseudo-spectrum generalized standard-controlled miss-target amount online planning and reconstruction proposed in Embodiment 1 of the present invention. The performance of the input guidance method. The simulation model is the CAV-H introduced in Section 3) of the initialization step in Embodiment 1. The random deviation considered includes the initial state deviation (altitude, latitude and longitude, speed, ballistic inclination and heading angle), aerodynamic deviation and atmospheric environment deviation. The initial state and terminal state are shown in Table 1. In addition, the The roll angle and heading error angle converge to zero, and the 3-sigma values ​​of random disturbances are shown in Table 2. The update cycle of guidance instructions is 1Hz, and all programs are run in ...

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

No PUM Login to view more

Abstract

The invention discloses an adaptive segmentation multistage linear spectrum generalized standard control missdistance reentry guidance method. The guidance method is applied to a high-lift-drag-ratio reentry aircraft and can satisfy multiple terminal constraints and process constraints. The method combines basic ideas of nonlinear model prediction control, a multistage linear pseudo spectrum method and calculus of variations, is greatly different from a Yu method in that a processing object is reduced-order nonlinear reentry dynamics taking a coupling effect into consideration, and also takes terminal heights and trajectory inclination angle constraints into consideration apart from considering a terminal position requirement and a roll angle requirement.

Description

technical field [0001] The invention relates to the field of aeronautical flight, in particular to an adaptive segmented multi-segment linear pseudo-spectrum generalized standard control miss amount reentry guidance method. Background technique [0002] As we all know, the re-entry aircraft needs to withstand the harsh re-entry environment during the re-entry flight phase, and the re-entry guidance system—providing guidance instructions to guide the aircraft to fly to the target safely and accurately is very important for the re-entry flight. With the successful flight of Apollo spacecraft and space shuttle, the research of reentry guidance algorithm has made great progress. [0003] Although many types of guidance algorithms exist, the most famous guidance algorithm is the space shuttle guidance law, which is the basis for all tracking guidance algorithms. The space shuttle re-entry aircraft guidance law is mainly divided into two parts, one part is to plan a drag accelera...

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
no application Login to view more
IPC IPC(8): B64G1/24
CPCB64G1/24
Inventor 陈万春杨良杜文豪周浩
Owner BEIHANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap