ISARLAB - Inverse Synthetic Aperture Radar Simulation - Defence ...

DSTO-GD-0210• If the phase is left blank (this is different from a zero (0) value for phase)then a random phase is used. This random value can be seen by hitting theApply button then reinvoking the Induced Motion window.If the SMP 2 (pre-defined) option is chosen, the SMP File Choice windowthat appears (right side of Figure 19) will allow a file of roll, pitch and yawmotion data to be selected from a database. This database is indexed using SeaState, Heading relative to swell and Ship Type, but only forrestricted instances of these parameters. The SMP (User defined) option allowsa similar file to be selected, but in this case the file could be generated by SMPusing arbitrary parameters. This option also allows measured ship motion datato be used, providing the same MATLAB array format is used.5. Pressing the Induced Motion Plot Go button will bring up the Targetinduced motion graphic window, an example of which is shown in Figure20. This window contains plots of the induced motion used in the simulationand shows with a red marker the segment of roll, pitch and yaw motionsencompassed by the current image frame. The Time field in the bottom rightcorner of the window can be edited to change the time extent displayed in theplots.6. To have the changes acknowledged click the Apply button. This updates theFigure 20: The Target induced motion graphic.2SMP is a Ship Motion Program that is run off-line to produce files of roll, pitch and yaw anglesas a function of time for various parameters [4].41