3D Graphics Properties for Sensors - Vertex Offset

Use to enable the projection for a sensor to be offset from the sensor parent object's actual position in the parent's body coordinate frame. For example, if the Horizon sensor were attached to the ERS-1 satellite (which was defined in the ECI coordinate frame), the sensor could be offset from the satellite's position in the ECI coordinate frame. The sensor's projection on the Earth is not significantly changed, only the location from where it begins is changed.

Inherit from Parent Object. If selected, uses the position offset from the parent object. The sensor and parent model have the same offset and, therefore, are displayed at the same location. If not selected, uses the position offsets that are set here.

Position offsets for the parent objects are set in the Offsets page of the parent object's 3D Graphics properties.

Translational

Use. If selected, specify the sensor projection starting point position offset in the parent object's body frame in the X, Y and Z direction. Also, specify the location from which the vertex is offset:

  • Sensor Radius - Offset along the axis of the boresight by a distance calculated by STK using the radius entered.
  • Boresight Offset - Offset along the axis of the boresight by the distance specified.

The position offsets and rotations are strictly graphical changes; calculations performed for the sensor are not affected. This would typically be used to move the sensor vertex to an antenna horn.

The position offsets are multiplied by the scale of the parent model. So a sensor offset of 9.1 kilometers on a satellite model using a scale of 10000x would display an offset of 91000 kilometers. This offset is strictly graphical and calculations for the sensor are not affected.

Attach Point

Use. If selected, the attach points defined in the model for the parent object appear in the Attach Point list.

Attach Point list. Lists the attach points specified in the parent object's model file. To begin the sensor projection from an attach point, select it from the list.

How To. . .