guided hypersonic re-entry and taem analysis...

ASTRIUMSpace Transportation

3rd Intl Workshop onAstrodynamics Tools & Techniques

2-5 October 2006

Guided Hypersonic Re-entry

and TAEM Analysis Tools

Philippe VERNIS – Eugénio FERREIRA

Guidance & Control Systems

ASTRIUM Space Transportation

3rd International Workshop on Astrodynamics Tools & TechniquesESTEC, 4 October 2006



2-5 October 2006

120 km

Mach 2

Mach 0.5

Available Tools (1)

� Atmopsheric Re-entry

Hypersonic phase

� managment of TPS/structure loads

& final accuracy

�� SITHAR simulation/design tool(Fortran 77)

TAEM phase

� alignment with runway

�� SITHAR simulation tool

�� HACATEP & EWING design/sizing tools(Matlab)



2-5 October 2006

� SImulation Tool for Hypersonic Atmospheric Re-entry

SITHAR (1)

� Fortran 77 code, ∼ 16000 code lines� from 1996 (V502 ARD mission) to 2006 (Pre-X phase B)



2-5 October 2006


SITHAR (2)

� ARD application

� mission definition & Guidance settings (V502 & V503 missions)

� preliminary GNC performances assessment

� cross-validation with complete 6 dof simulation tool (NRT & RT-HWIL)

� testbed for flight-proven NRT guidance scheme

SITHAR GNC Monte-Carlo results

Post-Flight Analysis



2-5 October 2006


SITHAR (3)

� Operating modes - Hypersonic/TAEM/end-to-end simulation

- single/Monte-Carlo runs (with statistical analysis)

- definition/refinment of hypersonic reference trajectory

(with Guidance in the loop)

- definition of hypersonic footprint boundaries

- definition of TAEM reference trajectory when crossing TEP



2-5 October 2006

� Current status

SITHAR (4)

� main applications - ARD (V502 & V503 missions)

- ARES-H

- Pre-X (Phases A & B)

- EXOMARS (direct or orbital entry)

- LFBB, Everest

- basis for ATPE 4 dof simulation tool: STAM(aerocapture & aero-gravity assist insertion techniques)

� possible extensions - implementation of others Guidance schemes for Hypersonic

re-entry or in case of abort manoeuvres

- implementation of TAEM back-up strategies

- coupling with Genetic Algorithm for trajectory and Guidance

settings optimization (GAGHARIN tool under home-funded

developments)



2-5 October 2006

EWING & HACATEP (1)

� Design/Sizing tools for TAEM phase relying on Buran strategy

TEP

NEP

HAC 1

HAC 2

HAC 3

HAC 4wind

runway

Auto-Landing

3: HAC homing

4: HAC tracking

2: HAC acquisition S-turn1: preliminary dissipation

S-turn

� Problems TAEM exit conditions fixed

HAC parameters fixed

runway located

TAEM exit conditions defined with margins

TAEM Entry Point defined

runway located

set of TAEM Entry Points

set of HAC parameters

& related reference trajectories

EWING

HACATEP



2-5 October 2006

� EWING: Energy WINdow Generation

EWING & HACATEP (2)

TAEM settings



2-5 October 2006

� HACATEP: HAC sizing with Adequation to TEP

EWING & HACATEP (3)

runway location & visualisation

TAEM settings

TAEM reference trajectoryTEP

NEP

runway

HAC

. waypoints

altitude

donrange (km)

crossrange (km)

runway

TEP



2-5 October 2006

� Simulation Tool for Aeroassist Manoeuvres

STAM (1)

� Fortran 77 code, ∼ 4600 code lines� SITHAR-like simulation tool



2-5 October 2006

� Simulation Tool for Aeroassist Manoeuvres

STAM (2)

� Operating modes - Aerocapture/Aero-Gravity Assist manoeuvres

- single/Monte-Carlo runs (with statistical analysis)

- definition/refinment of reference atmospheric path

- definition of aerocapture corridor

� Application - ESA Technological Research Program: ATPE



2-5 October 2006

Envisioned Further Works (1)

� Hypersonic Entry Guidance Robust Design

In order to prevent iterative empirical “handmade” tuning and to rely

on a robust design of both Guidance (via data settings) and reference

trajectory, Genetic Algorithm tools are under investigation

� Multidisciplanary Optimization mixing: Mission Analysis objectives

Guidance constraints� Guidance algorithm/strategy in-the-loop

Navigation performances

Control performances

Vehicle design constraints

� multi-environment � Earth, Mars

� multi-entry vehicles � low (ARD-like), medium (Pre-X-like), high (ARES-H-like) L/D

� multi-Guidance strategy � lateral logic, aoa modulation, terminal tracking, etc…but ARD scheme as longitudinal guidance baseline



2-5 October 2006

Envisioned Further Works (2)

� Genetic Algorithm for Guided Hypersonic Atmospheric Re-entry desIgN

GAGHARIN tool developped under Matlab environment based on SITHAR

Graphical User Interface

Matlab/SITHAR computational sharing

guided hypersonic re-entry and taem analysis...

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