TEC-EES Final Presentation Days 2001

17 May, 2001

Room Fresnel

ESA/ESTEC

Noordwijk, The Netherlands



Introduction

Problems to space missions caused by the space environment are a growing concern. The ESA Space Environments and Effects Analysis section supports ESA projects developing missions which can cope with operating in the presence of these hazards. The section is also responsible for defining and executing research and development activities in this field. These activities are funded from various ESA R&D programmes such as the Technology Research Programme (TRP), the General Support Technology Programme (GSTP) and the General Studies Programme (GSP). The final presentations of these activities allows wide exposure of the results and thorough discussion of issues arising from them. By grouping similar topics together into a Final Presentations Day, greater interaction is encouraged. Previous Final Presentation Days were held in 1998 and 1999.

The programme for the 2001 FP Day is as follows:

 

time topic Presenter Team
09:15 Introduction E. Daly ESA
09:25 Martian Environment Models F. Forget CNRS-LMD and Univ. Oxford
10:10 The Space Environment Data System (SEDAT) M. Hapgood CLRC-RAL
10:55 Coffee    
11:05 - brief report -
The Space Environment Information System (Spenvis)
D. Heynderickx BIRA-IASB
11:25 Spacecraft Anomaly and Prediction System P. Wintoft IRF-Lund
12:10 IPICSS - Investigation of Plasma-Induced Charging of Satellite Systems J. Forest IRF-Kiruna
12:30 - brief report -
The SPINE Research Network for Spacecraft Plasma Interactions
A. Hilgers ESA
12:45 - brief report -
Tools for radiation shielding and effects, including Geant4
P. Nieminen ESA
13:00 Lunch    
14:00 The Charged Particle Telescope E. Valtonen Aboa Space Research (SF)
14:45 - brief report - Radiation Monitoring activities (SREM, MSREM, MRM,...) P. Nieminen ESA
15:00 - brief report - A CCD Miniature Radiation Monitor A. Chugg Matra BAe (UK)
15:20 Coffee    
15:30 Development of Detecting Elements for Radiation Monitors J. Koskinen Detection Technology (SF)
15:45 Debie - In-situ Impact Detectors in Space Environment Juha Kuitunen Patria Finavitec et al.
16:25 DEBIE Data Pre-Processing Tool Kari Jurvi Space Systems Finland
16:45 Meteoroid/Debris Models for GEO A. McDonnell Unispace Kent et al.
17:30 - Discussion
- Conclusions
- Planned Activities
E. Daly ESA
18:00 End    


Abstracts

Martian Environment Models

François Forget, CNRS/LMD (F)

A new database of global Martian atmospheric data from the surface up to an altitude of 120 km, obtained from general circulation models of the Martian atmosphere at Laboratoire de M?t?orologie Dynamique (Paris, F) and Clarendon Laboratory (Oxford, UK) will be presented. This database is suitable for entry and aerocapture studies as well as instrument design and covers12 seasons, 12 times of day and several dust scenarios. Variability models and access software for mission analysis, as well as comparisons with with Mars-GRAM will also be presented.

 


The Space Environment Data System (SEDAT)

Mike Hapgood and Richard Stamper, CLRC Rutherford Appleton Laboratory (UK)

SEDAT is an ESA-funded contract to develop a powerful new tool for examining space environment datasets. This talk will first outline the overall SEDAT system and then focus on end-user functionality. The heart of the user functionality is a Java-based graphical user interface. We will show how this can be used to browse through the available datasets, to create tools to process these data and to build queries in which these tools are applied to specific datasets. We will also show the ability of SEDAT to output results in both graphical and text forms and to store results as new datasets. Finally, we report on the current status of project and plans for completion.

 


Brief report on The Space Environment Information System

D. Heynderickx, Belgian Institute for Space Aeronomy

The SPace ENVironment Information System (SPENVIS), developed under the GSTP, provides standardized access to models of the hazardous space environment through a WWW interface. The interface includes parameter input with extensive defaulting, definition of user environments, streamlined production of results (both in graphical and textual form), background information, and extensive on-line help and background information. Intranet and single-user implementations are availabe in addition to the main Internet site. SPENVIS is designed to help spacecraft engineers perform rapid analyses of environmental problems and includes models for:

  • Radiation environments
  • Radiation Effects
  • Spacecraft Surface Charging
  • Spacecraft Internal Charging
  • Atmosphere and ionosphere (including atomic oxygen)
  • Microparticles (small debris and meteoroids)
  • Geomagnetic Fields
  • Access to data from space environment measurements
  • The ECSS Space Environment Standard

See also: http://www.spenvis.oma.be/spenvis/



Development of AI Methods in Spacecraft Anomaly Predictions (Spacecraft Anomaly and Prediction System - SAAPS)

P. Wintoft and L. Eliasson, Swedish Institute of Space Physics

In April 1999 the ESA funded project "Development of AI Methods in Spacecraft Anomaly Predictions" was initiated. The goal is to develop web based tools for the analysis and prediction of spacecraft anomalies. The collection of tools and data are called "Spacecraft Anomaly Analysis and Prediction System" - SAAPS. SAAPS consists of three subsystems: 1) a database of space environment data and spacecraft anomalies, 2) analysis tools, and 3) prediction tools. SAAPS is implemented in Java as this simplifies cross-platform development and web access. The tools are data driven models the utilise the data in the SAAPS database. The algorithm used are statistical and AI based (neural networks and fuzzy systems). As the database is updated in real time this will enable nowcasting and forecasting of space environment data and spacecraft anomalies. For additional information visit http://www.irfl.lu.se/saaps .

 


Investigation of Plasma Induced Charging of Satellite Systems (IPICSS)

 J. Forest and L. Eliasson, Swedish Institute of Space Physics

This study led to a prototype of a plasma simulation code, PicUp3D/Spis, based on a complete 3D multi-species Particles-In-Cells (PIC) approach, allowing the modelling of complex 3D realistic geometry in a large domain of space environment conditions. First results have confirmed the capacities of the PIC method to model complex space systems in LEO/PEO, including the dynamic behaviour of the surrounding plasma. The possibility to compute consistently  field maps and particle trajectories opens up interesting applications for plasma instrument calibrations. The current limitations of the PIC method, in particular in the geometrical spacecraft description have been reduced by using the capacitance method and appropriate boundary conditions. Tests  indicate that this last point remains critical regarding the accuracy of the approach. On the computing side, special care was given to requirements for future network-based co-development in a scientific environment. To this end the Java language and the Object Oriented Approach were investigated in detail. Existing Open Source Software and elements under GPL license were extensively used, in particular in the tools for 3D modelling of spacecraft structure and a geometrical description using the VRML language. Advanced HTML based documentation was developed to build a better link between  models used and their implementation. Benchmarks have confirmed the feasibility of using  Java  for huge simulations. The relative simplicity of its Object Oriented Approach and its great portability tend to confirm its suitability for a community-based development. Finally, it allows a future integration with Web-based simulation and mission support tools, such as SPENVIS, and web based data bases of materials.

 


Brief report on The SPINE research network for spacecraft plasma interactions

A. Hilgers, ESA

SPINE is a Spacecraft Plasma Interactions Network in Europe with the objective to share resources and to co-ordinate efforts in all domains related to the interaction of spacecraft with the space plasma. The creation of this network and its primary objectives have been decided during a Round Table held on 24-2-2000 at ESA/ESTEC. The current structure of SPINE is informal and any one interested from the ESA member states may become a member of the network. A brief report will be given on the current activities of the network.

 


Brief report on Geant4 Tools for Radiation Shielding and Effects

P. Nieminen, ESA

ESA has since 1997 been a member of the world-wide Geant4 Collaboration and has in this frame sponsored and participated in the development of various software tools in the Geant4 toolkit for space radiation shielding and effects simulation. This talk summarises the capabilities of the software modules currently available, and gives an overview to on-going and planned R&D developments.

 


Charged Particle Telescope Phase A

E. Valtonen, Aboa Space Research  (SF)

Charged Particle Detector is an energetic particle sensor intended for measuring ionising corpuscular radiation in near-Earth space. The aim of the instrument is to produce data that will be used to improve the understanding of the magnetospheric radiation environment and to adjust existing models of radiation environment in near-Earth space. CPT will be a state-of-the-art instrument providing high-precision data for technological applications. In this final presentation, an overview of the Phase-A design of the CPT will be given. The capability requirements of CPT are defined. The required resolution and coverage for the measured particle fluxes in terms of particle species, energies, directionality, time and space are described. Possible engineering applications of CPT data are given, and different user groups are defined. Future development plans will finally be outlined.

 


Brief report on Radiation Monitoring activities (SREM, MSREM, MRM,...)

P. Nieminen, ESA

Radiation monitors serve various aims in the study of space radiation environments and effects, including 1) diagnostic purposes for onboard anomaly investigation, 2) radiation alarm function in case ambient particle fluxes exceed certain pre-determined thresholds, 3) updating and improvement of radiation environment models. ESA is vigorously supporting the development and further miniaturisation of such monitors, with the ultimate aim of including one or more dedicated devices in all new spacecraft. The ESA-originated radiation monitors currently include the Standard Radiation Environment Monitor (SREM), its miniaturised version (MSREM), and two versions of a Miniature Radiation Monitor (MRM). Each of these activities are briefly described.

 


Brief report on CCD Miniature Radiation Monitor

A. Chugg, Matra BAe (UK)

A miniature radiation monitor (MRM) device has been developed, which utilises a CCD as its sensitive element. Its shielding configuration has been designed to mitigate the displacement damage threat in space environments, whilst also introducing a good degree of directional sensitivity. The aim of the activity is a versatile flight instrument with a mass below 100 grams. In this presentation, the basic design of the CCD MRM is described, together with first results from on-ground irradiation testing.

 


Development of Detecting Elements for Radiation Monitors

Jussi Koskinen, Detection Technology (SF)

This activity consisted of the design, manufacturing and thorough characterisation of 33 silicon diode detectors intended for the flight units of the new ESA miniaturised Standard Environment Monitor (MSREM). The design parameters, manufacturing processes and test procedures and results of the detector diodes will be presented.

 


Debie - Standard In-situ Debris Monitoring Instrument

Juha Kuitunen, Patria Finavitec Oy Systems (SF), Metorex International Oy (SF), Space Systems Finland Oy (SF), UniSpace Kent (UK)

Patria Finavitec has developed the DEBIE (DEBris In orbit Evaluator) instrument to determine the parameters of space debris and micrometeoroids in-situ by their impact with a detecting surface. The main goal has been to develop an economical and low-resource instrument, easy to integrate into any spacecraft, while providing reliable real-time data for space debris modelling.

The DEBIE instrument is based on a prototype sensor unit developed by UniSpace Kent. The idea is to combine several different detectors to improve the reliability of the measurement. Patria Finavitec has been the prime contractor and designed the electronics in developing an industrial version of the instrument. Subcontractors include Metorex International (mechanical design and manufacturing of the Sensor Unit) and Space Systems Finland (flight software). UniSpace Kent has provided scientific support.

The first flight of the DEBIE instrument will be in 2001, on board the PROBA satellite. A second flight model is under construction and will be placed on the International Space Station.



DEBIE Data Pre-Processing Tool

Kari Jurvi, Space Systems Finland

The DDPP study produced tools and user interfaces to pre-process data received from the DEBIE impact detector flying on ESA's PROBA spacecraft scheduled for launch later in 2001. The tools will be used to retrieve and validate data received from DEBIE and PROBA and store them in a database. The user interfaces, DEBIE Data Web Site and DEBIE Public Web Site, will be used to give access to the scientific data and to summary impact detection information, respectively. This presentation briefly describes the path that the data takes from the instrument to the database and demonstrates the capabilities of the user interface as a pre-processing and analysis tool.

 


Update of Statistical Meteoroid/Debris Models for GEO

J.A.M. McDonnell, E. Agutti, M. J. Burchell, S. F. Green A. Griffiths, N. McBride, W. C. Carey, M. J. Cole, D. J. Catling, B. J. Goldsworthy, M. J. Willis, J. C. Zarnecki (Unispace Kent, UK), K. D. Bunte, H. Sdunnus (Eta_Max space, D), R. Walker (DERA, UK), J.-C. Mandeville, M. Bariteau (ONERA, F), D. Hamilton (Univ. of Maryland, USA), A. L. Graps, E. Grün (MPI f. Kernphysik, D)

The presence of the in-situ micro-particle detector GORID has stimulated understanding of the relationships between solid particles and the low energy radiation and plasma environment. We have developed quantitative assessments of the interactions and modelling of population dynamics and, especially, a model for predicting GEO populations is developed and tested (DIADEM) which is linked to Master 99, ESA’s comprehensive space debris tool. The exciting GEO data from GORID prompted study of the role of electrostatic charges, closely linked to the orbital dynamics for the smaller particles which we find, in the study, may achieve surface potentials exceeding some 20 KV. We have also studied debris source terms and dynamics in HEO with the main emphasis being the small size population down to about 0.1 micron. The orbital evolution of space debris particles and of particle clouds is studied, including GEO and near-GEO orbits as well as GTO and other high altitude orbits. In addition laboratory tests were performed to study the effects of impacts on the detector side walls and of charged particles.