The Ground Vehicle Object
The Ground Vehicle object models the properties and behavior of a vehicle that travels on the surface of the earth. Select one or more of the following to model a ground vehicle, impose constraints, and define the ground vehicle's subobjects:
Basic Properties
Property |
Description |
Route |
Define the ground vehicle's route using one the following propagators:
Great Arc | Defines a point-by-point path over or below the surface of the Earth with position and altitude or depth defined at each point. | StkExternal | Enables you to read the ephemeris for a vehicle from a file. | RealTime | Enables you to propagate vehicle ephemeris using near-real-time data received over a Connect socket. |
|
Attitude
|
Define an attitude profile for the ground vehicle. |
Lighting
|
Define the eclipse central body list used for lighting computations. |
Ground Ellipses
|
Add a set of ellipses for the ground vehicle. |
Description
|
Record useful information about the ground vehicle. |
EOIR Shape
|
Specify EOIR image generation properties for the ground vehicle. This works with STK's Electro-Optical Infrared (EOIR) capability. |
2D Graphics Properties
Property |
Description |
Attributes
|
Define color, line style, and other graphics characteristics for the ground vehicle, and choose whether to inherit or override global attributes defined at the scenario level. |
Route
|
Define the graphical display of the ground vehicle in the 2D Graphics window. |
Range
|
Define range contours representing the various regions of the surface that can see an object at the specified level. |
Lighting
|
Define the graphical display of lighting conditions for the ground vehicle during animation. |
Ground Ellipses
|
Set display graphics for an ellipse set defined for the ground vehicle. |
Radar Cross Section
|
Define the 2D contour graphics for the desired frequency. |
3D Graphics Properties
Property |
Description |
Route |
Define route properties for the ground vehicle. |
Attitude Sphere
|
The Attitude Sphere is a visualization aid that, when combined with vector display, constitutes a powerful tool for displaying the ground vehicle's attitude and for tracking attitude changes over time. |
Vector
|
Control the display of vectors and other geometric elements related to the ground vehicle. |
Covariance
|
Define the graphical display of a 3D ellipsoid. |
Model
|
Specify a model to represent the ground vehicle in the 3D Graphics window and then scale the model and adjust the position of any model articulations. |
Offsets
|
Position a model and marker representing the ground vehicle in the 3D Graphics window by offsetting the object from its reference frame. |
Model Pointing |
Point parts of the ground vehicle model toward a target, such as the Sun or Earth. |
Range
|
Display range contours for the ground vehicle. Range contours display in accordance with the values set for 2D Graphics Range Contours for the ground vehicle. |
Data Display |
Display dynamic data for the ground vehicle in the 3D Graphics window. |
Ground Ellipses
|
Set display graphics for an ellipse set defined for the ground vehicle. |
Radar Cross Section
|
Control the 3D display of RCS contour lines. |
Constraints
Property |
Description |
Basic
|
Impose a variety of standard access constraints (azimuth and elevation angle and rate, range and range rate, propagation delay, etc.) from the ground vehicle to another object. |
Sun
|
Impose a variety of access constraints from the vehicle to another object based on the position of the Sun and the Moon. |
Temporal
|
Impose time-based access constraints from the vehicle to another object. |
Targeting
|
Define the relationship between the ground vehicle and its target. |
Vector
|
Constrain access computations with respect to any valid vector or angle. |
Special
|
Special access constraints are defined in terms of geostationary belt exclusion, height above horizon, terrain grazing angle, and exclusion of other scenario objects. |
Search/Track
|
Radar Search/Track Constraints property pages enable you to enter minimum and maximum values for several parameters. You can also choose from the following Doppler options:
- Search/Track. These parameters correspond to the radar's main channel. These parameters account for the polarization mismatch, if you select polarization on the Basic Polarization page.
- ST w/Jamming. These parameters correspond to the main channel radar receiver that is under the influence of jamming. When the radar receiver polarization is set and the jammers are polarized, the search/track parameters take polarization mismatch into account. Most of these parameters are re-computed under the impact of jamming on the radar receiver main channel. For more information on the effects of jamming on constraints, see Constraints with Jamming.
- S/T OrthoPol. These parameters correspond to the radar's orthogonal polarization channel.
- S/T OrthoPolJam. These parameters correspond to the radar's orthogonal polarization channel under the threat of jamming.
You can extend the STK Radar SAR computation and constraints with the Search/Track plugin constraint. See Search/Track User Plugin.
|
SAR
|
SAR property pages enable you to impose certain constraints on synthetic aperture (SAR) radar.
- SAR. These parameters correspond to the main channel (SAR).
- SAR w/Jamming. These parameters correspond to the main channel under jamming. For more information on the effects of jamming on constraints, see Constraints with Jamming.
- SAR OrthoPol. These parameters are enabled when you select the receiver side orthogonal polarization.
- SAR OrthoPolJam. These parameters are enabled when you select the receiver side orthogonal polarization. For more information on the effects of jamming on constraints, see Constraints with Jamming.
You can extend the STK Radar SAR computation and constraints with the Search/Track plugin constraint. See SAR User Plugin.
|
Plugins
|
An interface is available for defining custom constraints in terms of user-supplied scripts created in VBScript and MATLAB. |
RF Properties
Property |
Description |
Environment
|
Apply environmental factors that affect the performance of a communications link or a radar system.
|
Radar Cross Section
|
Specify the radar cross section (RCS) parameters. |
LASER Properties
Property |
Description |
Environment
|
Apply environmental factors that affect the performance of a laser communications link. |
Subobjects
You can attach the following subobjects to a Ground Vehicle: