地磁気姿勢計による「たんせい」の姿勢測定

概要

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The attitude of the experimental satellite "TANSEI" (1971-011 A) launched on Febrary, 1971, was measuree utilizing two flux-gate magnetometers and a sun sensor. One magnetometer was loaded in parallel with the satellite's spin axis and another was parpendicular to the axis. Angle between the axis and the geomagnetic force line is detectable from the outputs of magnetometers. Similarly, angle of the sun is detectable with sun sensor. The orientation of the spin axis is determinated at the position of satellite in space when the calculated orientations of geomagnetic field and the sun are known. As a result, the right ascension of the spin axis orientation was 98〜102 degrees and the declination of that was 8〜9 degrees in the right ascension-declination coordinate system. And the "TANSEI" attitude was very stable without periodic motions as precession. But it leaves something to be improved to measure the attitude. One of the problems is magnetic influence upon the magnetic sensors from another instruments. And it had need improve the attitude sensor or use jointly with another attitude sensor to detect more precisely.
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