Patent ID: 7447112

Claim:
A test method for a method for passively obtaining target data about a moving target which is emitting wave energy, in particular sound, from which direction angles are measured as actual target data at successive track positions of a vehicle, in particular of a water vehicle, which determines its track positions using an on-board autonomous navigation system, in particular an integrated navigation system, by finding the direction of the target using an on-board-based direction-finding system, with the target range, the target velocity, the target course and/or the target positions being determined from this as further actual target data, wherein, at the times at which the directions to the target are determined from the vehicle, the positions of the target and vehicle are measured using a land-based and/or satellite-based position-finding measurement system, the direction angles and target ranges are calculated from the positions of the vehicle and target measured in this way and in each case associated with one another, a smoothed reference target track is estimated from the value pairs of the mutually associated, calculated direction angles and target ranges and the track positions which are associated with these value pairs at the correct time are determined using the navigation system of the vehicle, and reference direction angles, reference target positions, reference target ranges, a reference target velocity and/or a reference target course are/is derived from the reference target track and are/is compared with the corresponding actual target data, and the magnitude of the discrepancy is assessed.