function y=A_SIM(Asat,K_SAT,H_SAT,L_SAT,Q_SAT,vitesseroue);

 % Calcul de la matrice A_SIM de l''équation dX/dt=A_SIM X+B_SIM U
 
% vitesseroue=vit_roue(length(vit_roue));

 N_SAT=K_SAT+vitesseroue*H_SAT;

 P_SAT=L_SAT+vitesseroue*Q_SAT;

 mat1=-inv(Asat)*N_SAT;

 mat2=-inv(Asat)*P_SAT;

 A(1:3,1:3)=mat1;
 
 A(1:3,4:6)=mat2;

 A(4:6,1:3)=eye(size(mat1));

 A(4:6,4:6)=zeros(3,3);

 y=A;  

 End;