gfare

gfare — filter Riccati equation

Calling sequence

[Z,H]=gfare(Sl)  

Parameters

Sl : linear system (syslin list)
Z : symmetric matrix
H : real matrix

Description

Generalized Filter Algebraic Riccati Equation (GFARE). Z = solution, H = gain.

The GFARE for Sl=[A,B,C,D] is:



(A-B*D'*Ri*C)*Z+Z*(A-B*D'*Ri*C)'-Z*C'*Ri*C*Z+B*Si*B'=0
   
    

where S=(eye()+D'*D), Si=inv(S), R=(eye()+D*D'), Ri=inv(R) and H=-(B*D'+Z*C')*Ri is such that A+H*C is stable.

See also

gcare