Missile: DeckAccess Data: Start Time CBIVVLH Geometry

The relative geometry at the access start time, expressed with respect to inertial VVLH axes of the source object.

Name Dimension Type Description
Time DateFormat Real Number Time.
Azimuth LongitudeUnit Real Number Dihedral angle between north vector and velocity vector about the detic nadir vector. The velocity vector is the velocity of the object, as observed in the object's central body fixed coordinate system.
Elevation AngleUnit Real Number Angle between the velocity vector and the local horizontal plane. The velocity vector is the velocity of the object, as observed in the object's central body fixed coordinate system.
Range DistanceUnit Real Number The range (i.e., distance between the primary and secondary object) at the given time.
Range Rate Rate Real Number The rate of change of the magnitude of the relative position vector. This is computed using the analytical formula dot_product(relative_position_vector, relative_velocity_vector) / magnitude(relative_position_vector). This is an exact formula when the velocity is the derivative of position. Some propagators (e.g., SGP4, J2Perturbation, J4Perturbation), however, produce ephemerides where the velocity is not exactly the derivative of position so that this formula does not compute the derivative of range exactly in such cases.
Azimuth Rate AngleRateUnit Real Number The rate of change of the azimuth angle.
Elevation Rate AngleRateUnit Real Number The rate of change of the elevation angle.
Relative Velocity Rate Real Number The magnitude of the difference in the inertial velocities of the primary and secondary objects at the given time.
Horizontal Relative Velocity Rate Real Number The projection of the relative velocity into the horizontal (i.e., XY) plane.

STK Programming Interface 11.0.1