Targeted Attitude Segments

STK lets you override the basic attitude profile for a satellite, missile, or launch vehicle and have a selected axis (its Z axis by default) point in the direction of one or more selected targets, subject to applicable access constraints. To use targeted attitude, select the checkbox labeled Override Basic attitude for selected targets, and then click Select Targets....

To create a targeted segment of a multi segment profile, click Add/Edit in the Target Segments frame.

Assigning Targets

Highlight each object that you wish to designate as a target in the Available Targets list and use the right arrow button to move it to the Assigned Targets list. To de-assign a target, highlight it in the Assigned Targets list and click the left arrow button. You can also move objects back and forth between the two lists by double-clicking them.

Target Slew

Click Target Slew... to define the time required for the satellite to move from its basic attitude to its target pointing attitude, and to change from the target pointing attitude back to the basic attitude. Select a Slew mode from the drop-down menu; the modes are described in the following table.

Mode	Description
Fixed Time	The time required to change attitude will always the same, defined by the Slew time field. Select Match angular velocity to take account of the angular velocity (slope) at the beginning and end of the slew.
Fixed Rate	The time required to change attitude will be calculated by applying a fixed slew rate, limited to the Maximum slew time. From the Slew timing between targets drop-down menu, select an event within the window of opportunity to trigger each slew, or select Optimal to change attitude whenever the slew can be performed most efficiently. Define the maximum slew rate by entering a maximum overall Magnitude. You can constrain the slew rate in specific directions by selecting one or more Per Axis rates and defining separate maximum rates for those axes.
Constrained	The time required to change attitude will be calculated by applying a constrained slew rate and acceleration, limited to the Maximum slew time. From the Slew timing between targets drop-down menu, select an event within the window of opportunity to trigger each slew, or select Optimal to change attitude whenever the slew can be performed most efficiently. From the Slew type menu, select to use a 2nd or 3rd order spline as the interpolation method of the slew's data points. Define the maximum slew rate and slew acceleration by entering maximum overall Magnitude. You can constrain the slew rate or acceleration in specific directions by selecting one or more Per Axis rates and defining separate maximum rates for those axes.

Target Scheduling

Click Target Times... to open the Target Times Window.

Advanced

Click Advanced... to open the Target Advanced Access Window.

Pointing Adjustments

The default pointing attitude of a satellite is defined in such a way that the Z axis is aligned along the line of sight vector to the target, and the X axis is constrained about the relative velocity vector. To change these settings, click Target Pointing... and make the desired changes for the Aligned and/or Constrained Vector.

The Reference for the Aligned Vector is line of sight. For the Constrained Vector, you have the option of using the default Reference (relative velocity) or clicking Select to choose another.

If there are multiple targets, a checkbox gives you the option to apply this configuration to all targets.