Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Anti-disturbance guidance method for precision landing of planet

A planetary and precise technology, applied in the field of deep space exploration, can solve the problems affecting the normal descent process, the trajectory optimization algorithm is limited, and the trajectory is difficult to ensure optimality, etc., to reduce the amount of calculation and solution difficulty, realize disturbance compensation and suppression, The effect of improving safety

Active Publication Date: 2017-09-26
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF7 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, limited by the computing and storage capabilities of the spaceborne computer, the trajectory optimization algorithms that can perform online real-time calculations are very limited, and the requirements for the form of constraints are also very strict, making it difficult to guarantee the optimality of the trajectory generated online, and when the external environment changes , the system cannot make adjustments in time, affecting the normal descent process

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
  • Anti-disturbance guidance method for precision landing of planet
  • Anti-disturbance guidance method for precision landing of planet
  • Anti-disturbance guidance method for precision landing of planet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] In order to verify the feasibility of the method, for the dynamic descent section of the Mars landing, the fixed coordinate system of the landing point is adopted, and the initial position r of the dynamic descent section of the probe is 0 for [-400,700,520] T m, the initial velocity v 0 is [19.34,-9.15,-29.16] T m / s, end position r f is [0,0,0] T m, terminal velocity v f is [0,0,0] T m / s, the gravitational acceleration g of Mars is [0,0,-3.7114] T m / s 2 , the negative sign indicates that the direction is vertically downward, and the maximum control amplitude u max 15m / s 2 , the minimum control magnitude u min -15m / s 2 , the maximum velocity amplitude v max is 60m / s, the glide angle constraint φ max is 72°, the line of sight angle constraint and θ max is 50°, the landing time t f is 30s, the sampling interval Δt is 1s, and the rolling time domain length N is 10.

[0070] A planetary precise landing anti-disturbance guidance method disclosed in this embo...

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 anti-disturbance guidance method for precision landing of a planet, relates to a guidance method for the precision landing of the planet and belongs to the technical field of deep-space detection. A non-linear model predication control method capable of directly treating non-linear and non-convex constraints is introduced in a plant descending process; a precision landing track optimization problem of the planet is only calculated on a limited-dimension rolling time domain and the calculation amount and the solving difficulty are reduced; online generation of a precision landing guidance rule of the planet and an optimal track is realized; meanwhile, external disturbance in the descending process is considered, real-time estimation is carried out on the external disturbance by adopting an expansion state observer and correcting control quantity, so as to realize disturbance compensation and inhibition and improve the safety of a landing task. The anti-disturbance guidance method has the following two advantages that (1) the calculation amount and solving difficulty of the precision landing track optimization problem of the planet can be reduced and the online generation of the optimal track is realized; (2) influences, caused by the external disturbance, on a system are reduced and the safety of the landing task is improved.

Description

technical field [0001] The invention relates to a planetary precision landing guidance method, in particular to a planetary precision landing anti-disturbance guidance method, which belongs to the technical field of deep space exploration. Background technique [0002] In order to obtain higher scientific returns in planetary exploration missions, future deep space missions require probes to reach more complex terrain surfaces than before, which puts high demands on landing accuracy. However, uncertain factors such as environmental disturbances during the descent may cause the probe to deviate from the nominal trajectory, resulting in unpredictable and serious consequences, thus endangering the safety of the entire landing mission. In order to eliminate the influence of these unfavorable factors, it is necessary to take external disturbances into consideration during the mission design process, and generate corresponding guidance instructions online to guide the probe to lan...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/24G01C21/20
CPCG01C21/20G01C21/24
Inventor 崔平远葛丹桐刘阳高艾于正湜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products