“…The H control objective is to find a controller that minimizes a quadratic performance index (the H norm) of the system and offers a way of combining the design criteria of quadratic performance and disturbance rejection [13]. For the control system in equations (29),(30) and (31), it is required that the system matrix is of full rank, the pairs , and , are required to be stabilizable, , is required to be detectable and it is required that all the system state measurements are possible.…”