Attitude intercalibration of the star imager and the spherical compact sensor magnetometer for the Oersted geomagnetic satellite mission

Torben Risbo; Nils Olsen

doi:10.1117/12.255145

28 October 1996 Attitude intercalibration of the star imager and the spherical compact sensor magnetometer for the Oersted geomagnetic satellite mission

Torben Risbo, Nils Olsen

Author Affiliations +

Proceedings Volume 2810, Space Sciencecraft Control and Tracking in the New Millennium; (1996) https://doi.org/10.1117/12.255145
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

The main instrument for mapping of the Earth's magnetic field onboard the Danish geomagnetic satellite Orsted is the 'gondola' consisting of a compact spherical coil fluxgate vector magnetometer (CSC) and a star imager (SIM). The SIM gives the attitude relative to the rectascension-declination system by taking a snapshot of the sky, the CSC measures the magnetic field vector in the instrument coordinate system. The attitude relation (gondola quaternion) between the star camera system and the magnetometer system is a fundamental instrument constant to be determined by calibration with arc seconds accuracy. This intercalibration has been carried out at the geomagnetic observatory at Brorfelde, Denmark. Snapshots of the sky were taken simultaneously with measurements of the Earth's magnetic field made by the CSC magnetometer and the observatory variometer. The SIM attitude obtained in the celestial coordinate system is transformed to the local terrestrial system. The observatory magnetic field observations are transformed to the SIM coordinate system. By comparisons with the CSC readings the orthogonal transformation between the two instrument systems is determined. If the instrument assembly is turned around in the known ambient geomagnetic field the procedure is equivalent to a thin shell calibration in a test coil system, and hence the magnetometer constants can be determined, too. Results from the calibration of the Orsted magnetic instrument are presented.

Citation Download Citation

Torben Risbo and Nils Olsen "Attitude intercalibration of the star imager and the spherical compact sensor magnetometer for the Oersted geomagnetic satellite mission", Proc. SPIE 2810, Space Sciencecraft Control and Tracking in the New Millennium, (28 October 1996); https://doi.org/10.1117/12.255145

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available