Comparison of rotational-run vs hybrid-measurement by modelling of a large test object/satellite

Within the AIT-process the verification of magnetic cleanliness requirements is an essential pre-requisite to ensure mission success, especially for satellites with dedicated magnetic mission requirements e.g. SOLAR ORBITER. Magnetic cleanliness verification usually comprises a combination of analytical and experimental methods. During the “magnetic system test” the object to be tested is characterized by a magnetic model which is built up of several dipoles. By measurements of projects within the last years, it became obvious that the size and weight of scientific satellites is increasing dramatically. Therefore it is necessary to adapt proven measurement/analysis methods to the new situation. This paper takes a closer look on the two special test set-ups (Rotational-Run, Hybrid-Measurement) by setting up a synthetic magnetic body, simulating a measurement in both set-ups, modeling a best fit dipole model based on the simulated measurements for each test set-up. In the end the magnetic field generated by the calculated magnetic multi dipole models is compared with the one generated by the synthetic magnetic body. This comparison takes place in an “observation area” a region of special magnetic interest.