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Numerical simulations are computer experiments where the real spacecraft and antennae are modelled in software. The underlying physical relations (electrodynamics) are solved by the means of sophisticated computer programs such as FEKO and Concept-II. Both programs use the so-called “Method of Moments” to solve the electrical field integraleEquation. In addition we have devised an antenna toolbox (Matlab, FORTRAN) for further analysis.
Numerical simulations are sometimes superior to experimental investigations of spacecraft antenna systems because they are more flexible. It is possible to investigate the influence of parasitic bodies in close vicinity to the antennae, or study different placement variants.
As a first application the RPWS antennas onboard the Cassini spacecraft were investigated in detail, with emphasis on the influence of specific parts of the spacecraft on the direction of the effective antenna axes. Currently, the placement and bending (due to high solar radiation) of the RPW antennas onboard Solar Orbiter are under investigation, as well as the true antenna properties of Waves onboard the JUNO spacecraft.
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| 1. |
Sampl, M.:
Fundamentals of numerical analysis: spaceborne radio astronomy antennas,
E & I,
7/8,
in press,
2011.
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| 2. |
Sampl et al.:
Numerical simulations of the Solar Orbiter RPW ANT antenna system,
PRE VII, Graz,
in press,
2011.
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| 3. |
Sampl et al.:
First results of the JUNO/Waves antenna investigations,
Loughborough Antennas & Propagation Conference, Loughborough University,
accepted,
2011.
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| 4. |
Sampl et al.:
Calibration of Electric Field Sensors onboard the Resonance Satellite,
IEEE Transactions on Antennas and Propagation,
accepted,
2011.
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| 5. |
Oswald et al.:
Various methods of calibration of the STEREO/SWAVES antennas,
Adv. Space Res.,
43,
355-364,
2009.
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| 6. |
Sampl et al.:
Resonance spacecraft antenna calibration: Rheometry and numerical simulations,
Loughborough Antennas & Propagation Conference, Loughborough University,
710-711,
2009.
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| 7. |
Macher et al.:
Rheometry of multi-port spaceborne antennas including mutual antenna capacitances and application to STEREO/WAVES,
Meas. Sci.Technol.,
18,
3731-3742,
2007.
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| 8. |
Macher et al.:
Wire-Grid simulations of the Mars Express/MARSIS antenna system,
In: Planetary Radio Emissions VI,
Eds. Rucker, H.O., W.S. Kurth, G. Mann,
Verlag der Österreichischen Akademie der Wissenschaften,
Wien,
483-490,
2006.
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| 9. |
Oswald et al.:
Numerical analysis of the STEREO WAVES antennas: First results,
In: Planetary Radio Emissions VI,
Eds. Rucker, H.O., W.S. Kurth, G. Mann,
Verlag der Österreichischen Akademie der Wissenschaften,
Wien,
475-482,
2006.
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| 10. |
Fischer et al.:
Wire-grid modeling of Cassini spacecraft for the determination of effective antenna length vectors of the RPWS antennas,
In: Planetary Radio Emissions V,
Eds. H. O. Rucker, M. L. Kaiser, Y. Leblanc,
Austrian Academy of Sciences Press,
Vienna,
347-356,
2001.
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