Method for designing reentry trajectory based on flight path angle planning
US-2021086921-A1 · Mar 25, 2021 · US
Method for directly planning reentry trajectory in height-velocity profile
US11079239B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11079239-B2 |
| Application number | US-202017031829-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 24, 2020 |
| Priority date | Aug 29, 2019 |
| Publication date | Aug 3, 2021 |
| Grant date | Aug 3, 2021 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A method for directly planning a reentry trajectory in a height-velocity profile includes the following steps: S1, extracting an actual working parameter of an aircraft, setting the maximum value {dot over (Q)}max of a stagnation point heat flux, the maximum value qmax of dynamic pressure, and the maximum value nmax of overload according to the mission requirement, and solving the height-velocity boundary of the reentry trajectory, that is, a lower boundary of the reentry trajectory in the height-velocity profile; S2, solving a reentry trajectory of an initial descent stage according to differential equations of reentry motion, and determining a starting point of a trajectory of a gliding stage according to the trajectory of the initial descent stage; and S3, planning a trajectory in the height-velocity profile satisfying terminal constraints based on the lower boundary in the height-velocity profile, and calculating a corresponding bank angle, to obtain the reentry trajectory.
First claim
Opening claim text (preview).
What is claimed is: 1. A method for directly planning a reentry trajectory of a spacecraft into Earth's atmosphere in a height-velocity profile, comprising the following steps: S 1 , extracting an actual working parameter of the spacecraft, setting a maximum value {dot over (Q)} max of a stagnation point heat flux, a maximum value q max of a dynamic pressure, and a maximum value n max of an overload according to a mission requirement, and solving a height-velocity boundary of the reentry trajectory for the spacecraft, wherein the height-velocity boundary of the reentry trajectory is a lower boundary of the reentry trajectory in the height-velocity profile; S 2 , solving a reentry trajectory of an initial descent stage according to differential equations of reentry motion, and determining a starting point of a trajectory of a gliding stage according to the reentry trajectory of the initial descent stage; and S 3 , planning a trajectory in the height-velocity profile based on the lower boundary in the height-velocity profile, wherein the trajectory in the height-velocity profile satisfies terminal constraints, and calculating a bank angle corresponding to the trajectory in the height-velocity profile, to obtain the reentry trajectory; step S 2 specifically comprises the following steps: S 21 , solving a flight state variable of the initial descent stage according to the differential equations of the reentry motion, and drawing the reentry trajectory of the initial descent stage in the height-velocity profile, wherein the differential equations of the reentry motion are expressed as follows: dr d t = V sin γ ; d θ d t = V cos γ cos ψ r cos ϕ ; d ϕ d t = V cos γsinψ r ; dV d t = - D m - g sin γ ; d γ d t = 1 V [ L m cos σ - ( g - V 2 r ) cos γ ] ; d ψ d t = 1 V [ L m cos γ sin σ - V 2 r cos
Assignees
Inventors
Classifications
Systems for re-entry into the earth's atmosphere; Retarding or landing devices · CPC title
- G01C21/24Primary
specially adapted for cosmonautical navigation · CPC title
- G01C21/20Primary
Instruments for performing navigational calculations (G01C21/24, G01C21/26 take precedence) · CPC title
- G05D1/101Primary
specially adapted for aircraft · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US11079239B2 cover?
- A method for directly planning a reentry trajectory in a height-velocity profile includes the following steps: S1, extracting an actual working parameter of an aircraft, setting the maximum value {dot over (Q)}max of a stagnation point heat flux, the maximum value qmax of dynamic pressure, and the maximum value nmax of overload according to the mission requirement, and solving the height-veloci…
- Who is the assignee on this patent?
- Univ Dalian Tech
- What technology area does this patent fall under?
- Primary CPC classification G01C21/24. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Aug 03 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).