Cynthia Vaskis

SLM521 Spring 2004

Dropin #3 Assignment

4/6/04

File: dp3invmx.htm

Compute an Inverse matrix

The inverse matrix can be created from multiplying the established design rotational matrix that would normally rotate a vector from the Earth’s ECI coordinate system into the space object’s coordinate system and the rotational matrix that rotates a vector in the space object’s coordinate system into the Star Tracker’s coordinate system. After the multiplication of these two matrices is performed producing matrix ROT, the inverse matrix INV is created by performing matrix reduction on matrix ROT and the same operations on an Identity matrix. When the matrix ROT has been reduced to an Identity matrix, the original Identity matrix will become the INV matrix that is needed to multiply the STFOVC vector to produce the STFOVECI vector in the Earth’s ECI coordinate system.