DLR Portal
Home|Sitemap|Contact|Accessibility Imprint and terms of use Privacy Cookies & Tracking |Deutsch
You are here: Home:Projects:Completed Projects:SHEFEX II
Advanced Search
News
Institute
Departments
Activities
Projects
Projects on Digital Transformation
Projects on Fault-tolerant Systems
Projects on High Performance Computing
Projects on Mathematical Modelling
Projects on Quantum Computing
Projects on Software Engineering
Projects on Visualisation
Completed Projects
ATON
BIROS
C²A²S²E
Core Avionics
CROSS DRIVE
DLR-PostProc
DLR Software-Katalog
DLR Software Standards
EmotionAAL
ESROCOS
Eu:CROPIS
EQUATE
GAP
HICFD
IMENS-3C
Mars Cartography in VR
MBSE4FDIR
Next Generation Train
OOV-TET-1
Online Monitoring
PartnerGrid
SHEFEX II
SimMoLib
TATT
TRACE
UCAV-2010
VR-OOS
Software
Publications
Offers
How to get to us
Print

SHEFEX II



 

 SHEFEX II: Navigation Hardware
zum Bild SHEFEX II: Navigation Hardware

In October 2005 the first version of DLR’s hypersonic SHarp Edge Flight EXperiment (SHEFEX) program was successfully launched from the Andøya Rocket Range in northern Norway. The mission investigated new shape possibilities for future launch or reentry vehicles, using a reentry vehicle body with facetted surfaces and sharp edges. The next generation experiment, SHEFEX II, will launch in 2010. This mission will focus on hypersonic flight control, using controllable canard fins, and will include experiments for new thermal protection system concepts.

Accurate control of the vehicle requires precise knowledge of the approach angle and the side slip angle. Both of these are derived from the flight path and vehicle attitude. A hybrid navigation system supplies this information by combining measurements from several sensors. The sensors that are used are an IMU, a GPS and a star tracker.

The Inertial Measurement Unit (IMU) is used to capture high dynamics. But it is subject to instrument errors that can cause the error in the navigation solution to grow exponentially, if not corrected. The Global Positioning System (GPS) receiver provides position and velocity measurements with bounded errors but only at a low rate. The strengths of these two instruments are combined to provide a high rate navigation solution with better accuracy, which can not be achieved by using only one of the two instruments separately.

To provide further attitude accuracy, an experimental star tracker will also be integrated together with the IMU and GPS. The star tracker measures the attitude of the vehicle with respect to the stars with bounded errors and at a low rate. The attitude solution is combined with the IMU and GPS data by the navigation filter to compute a full navigation solution consisting of position, velocity, and attitude.

The Simulation and Software Technology accompanies the development of the hybrid navigation system in the area of software quality assurance and software development. The developers of the navigation algorithms stage the tasks of the software development on the real-time operating system QNX. QNX encompasses preparation of general software architecture, assignment of serial bus drivers, and the general services for commanding, telemetry, and the recording of the experiment data in the bulk storage of the hardware platform.

 

Project runtime

2008-2011


Contact
Dr. rer. nat. Olaf Maibaum
German Aerospace Center

Institute for Software Technology
, Software for Space Systems and Interactive Visualization
Braunschweig

Tel.: +49 531 295-2974

Fax: +49 531 295-2767

Copyright © 2023 German Aerospace Center (DLR). All rights reserved.