Modeling the disturbing effect on the aist small spacecraft based on the measurements data

Abstract

The paper considers the issues of reconstruction of the power disturbing effect on the prototype of the small spacecraft "Aist". The measurements data of the components of the induction vector of the Earth's magnetic field by means of two three-component magnetometers were used for the reconstruction. The obtained results can be used to assess microaccelerations in the internal environment of small spacecraft, as well as to study their uncontrolled rotational motion.

Using the -Bdot Algorithm to Reduce the Angular Velocity of Rotation for the Aist Small Spacecraft Pilot Model

“…The mass of this device is 39 kg, including 11 kg of equipment for scientific research. Pilot model of the Aist small spacecraft and used coordinate systems: OX0Y0Z0 is the bench coordinate system in which the components of the small spacecraft inertia tensor were determined (point О is the geometric center of a small spacecraft); CXYZ is the main body axis coordinate system with the origin at the center of mass (point C) of a small spacecraft; xcyczc is the structural coordinate system of magnetometer № 2 (this coordinate system is left) (cited of [20]).…”

“…Let us estimate the significance for each of the disturbing influences included in equation ( 1). During ground tests of Aist small spacecraft pilot model, the axial and centrifugal moments of inertia in the axes of the test bench were experimentally established (OX0Y0Z0) [10,20]…”

“…Let us estimate the value of the gravitational perturbing moment by the formula [1,20]: where P is the gravitational parameter of the Earth; r is the orbit radius Aist small spacecraft pilot model; e r e is the unit vector of the direction to the Earth's center, which is shown in figure 1.…”

“…In [20], an estimate of the average aerodynamic force acting on Aist small spacecraft pilot model is given. It is approximately equal to 1,2•10 -6 N. Let us refine it by using the data for another similar spacecraft -the flight model of the Aist small spacecraft [5,10].…”

“…When estimating the maximum value of the magnetic perturbing moment, we use the well-known formula [6,18,20]:…”