Figure 7
(a) Co-magnetometer calibration result by the rotation of the earth. The measurement was started from the east direction. The sensitive axis in the y-direction is heading to various directions at every 30°. We measured the output signal at one heading position and then measured it at the opposite direction. This method could efficiently reduce the co-magnetometer drift. (b) The measured rotation rate sensitivity of the co-magnetometer. The co-magnetometer output signal was obtained, and the power spectral density was calculated. The scale factor calibrated by the rotation of the earth was used to convert the voltage signal into the rotation rate signal. The peaks between 1 Hz and 5 Hz are caused by the vibration isolation platform. The platform is a mechanical vibration system. The whole payload on the platform is about 250 kg.
