Patent ID: 7818103

Claim:
A test system for a marine vessel dynamic positioning system, wherein said dynamic positioning system comprises actuators ( 16 , 17 , 18 ), sensors ( 8 ), and a control system ( 2 ), said control system arranged for receiving real measurement signals ( 7 ) from sensors ( 8 ) and for output of control signals ( 13 ) to said actuators ( 16 , 17 , 18 ), said test system comprising a signal modifying computer ( 80 ) arranged for: receiving one or more of said real measurement signals ( 7 ), modifying said one or more real measurement signals ( 7 ) into modified measurement signals ( 70 ) that depend on real values of said real measurement signals; sending said modified measurement signals ( 70 ) to said control system ( 2 ), wherein said modified measurement signal ( 70 ) replaces one or more of said real measurement signals( 7 ); said control system ( 2 ) arranged for acting upon said one or more modified measurement signals ( 70 ) and remaining unaffected real measurement signals ( 7 ); wherein said signal modifying computer enables testing of said control system ( 2 ) function on errors represented by said modified measurement signals ( 70 ) imagined to occur in one or more sensors ( 8 ).