The objective of this activity has been to develop and consolidate a new strategy for system verification of the S/C radiated compatibility, based on appropriately designed testing at unit/subsystem level and numerical analysis at system level.
The technology and methodology developed in this project tries to solve some of these problems: - To reduce the costs related to EMC testing by:
- Reducing the duration of the test campaign,
- Limiting the need of using big EMC test facilities, since small or medium ones could be enough.
- To foresee potential EMC problems within the satellite structure by early identification of hot points, where the total electromagnetic field could exceed the specified limits.
The technology developed in this project tries to determine the electrical field at any point inside the satellite departing from the measurements performed on each individual equipment in the near field. It calculates by computation the field in the far field (spherical expansion) and the total field in given points inside the structure. The application of specific algorithms take into account the field produced by all the radiation sources inside the satellite as well as the total structure and materials that form the platform and the payload. The following steps were performed for the development of this project: - The performance of a theoretical study to analyse the physics of the problem and the potential solutions that are possible from the theory,
- Description of the case scenario to be treated during the project (theoretically and practically),
- The consolidation of the solution described in the theoretical study,
- The numerical verification of the procedure, applying the computational procedure to the case scenario departing from theoretical conditions and assumptions,
- The verification of the procedure, from the application of measurement and computation techniques to the real case defined for the project.
In addition, some other tasks needed to be performed to allow implementation and verification of the procedure. These being the design and manufacturing of electric and magnetic field probes adequate for the development and performance of the near field measurements in the full frequency range required for the project, and the design and manufacturing of radiating sources that allow the verification at the selected frequencies.
The total time needed for the performance of all the activities covered by this proposal was 25 months.
| WP | WP Description | Start | End | Duration (months) | | WP100 | Management | TO | TO+25 | 18 | | WP200 | Effective alternative technique to radiated system level | TO | TO+4 | 4 | | WP300 | Consolidation of the hybrid step-by-step procedure for EM prediction. ACR | TO+4 | TO+9 | 5 | | WP400 | Numerical verification of the procedure | TO+9 | TO+11 | 2 | | TRR | | TO+13 | | | WP500 | Testing - verifiction by measurements | TO+10 | TO+23 | 6 | | WP600 | Simulation software prototypes release | TO+25 | TO+25 | 2 |
The key issues faced during the project were as follows: - Definition of the theoretical approach to solve the problem related to the noise source placed on a ground plane and with a connecting cable that crosses the semi-sphere - need to measure the magnetic filed at short distance on the ground plane and on the wire,
- To solve the problems related to the applicability and verification of the method mainly concerning the characterisation of the standalone units;
- To solve the problem related to the measurement of the phase in the electric filed - need to use two probes, one of them to calculate the phase difference.
- Measurements set-up for the standalone units - required to solve different technical issues related to the geometry conflicts in the setup as well as the selection of the equipment.
- Verification at the mock-up.- Development of noise sources that allow the verification of the results was a difficult task in order to get enough noise level at different frequencies.
From the development of the method, it is expected that the effort required in the EMC campaign could be significantly reduced and the EMC information gained by this method become more relevant regarding electromagnetic compatibility problems inside the satellite.
The project is completed
Last Update: 18 Dec 2007
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