Uncontrolled motion of the Foton M-2 satellite and quasistatic microaccelerations on its board

Determination of the Attitude Motion of a Satellite Based on a Kinematical Model of Motion and Using Data of Measurements of Its Angular Velocity and the Earth’s Magnetic Field Strength

“…According to results of [1][2][3][4], the frequencies of such components in case of Foton satellites do not exceed 0.01 Hz.…”

“…Expression (1) presented above sometimes experiences significant oscillations with relatively high frequencies. In order to eliminate them, trigonometric terms in (1) were smoothed with the help of correcting multipliers (2) Here, N 1 is the integer part of the number N /2 . Expression (2) was constructed in all cases using the data of a single run.…”

“…They allowed one to determine reliably the level of quasi-static microaccelerations onboard these satellites. The data of measurements were processed in a unified way using integral statistical procedures based on a unitary dynamic model of attitude motion of a satellite [1,2]. The processing of measurements of the angular velocity and microacceleration made onboard Foton-11 by systems QSAM and BETA [1] and processing of measurements of the Earth's magnetic field (EMF) made onboard Foton-12 by the Mirazh instrumentation [2] showed that the attitude motion of these satellites has almost identical character.…”

“…The data of measurements were processed in a unified way using integral statistical procedures based on a unitary dynamic model of attitude motion of a satellite [1,2]. The processing of measurements of the angular velocity and microacceleration made onboard Foton-11 by systems QSAM and BETA [1] and processing of measurements of the Earth's magnetic field (EMF) made onboard Foton-12 by the Mirazh instrumentation [2] showed that the attitude motion of these satellites has almost identical character. However, measurements of the QSAM system onboard Foton-12 are markedly different from measurements of the same system onboard Foton-11 , and they are not in a good agreement with the results of determination of the angular velocity and microacceleration from EMF measurements onboard Foton-12 [3].…”

“…It consists in joint processing of the data of measurements made during a certain time interval and requires integration of the equations of satellite's attitude motion. However, this method uses only kinematical equations of motion and, hence, it is more universal than methods of [1,2]. Theoretically, it is suitable for determination of both controlled and uncontrollable motions of a satellite at any external mechanical moments acting upon it.…”