Patent ID: 6227496
Filing Date: 2001-05-08
Classification: B64G,G01C

Abstract:
An attitude determination system for an artificial satellite, comprising:an attitude estimating module for estimating an attitude angle and an attitude angular velocity of an artificial satellite on the basis of a gyro;sensor output processing means for determining an observed value of the attitude angle of said satellite on the basis of an output of a navigation sensor;a deviation arithmetic unit for arithmetically determining a deviation between said estimated attitude angle of said satellite and said observed value of the attitude angle of said satellite as determined;frequency component estimating means for estimating a DC component, a basic frequency component and a secondary frequency component of a drift of said gyro by processing said deviation as determined by means of first, second and third filters, respectively;drift component estimating means for estimating a drift component of said gyro on the basis of a sum of said estimated frequency components; andattitude angle estimating means for estimating the attitude angle and the attitude angular velocity of the satellite at a current time point on the basis of a value obtained by subtracting said estimated value of the drift component from the output of said gyro.