Styles by Object | Access Report Styles | Access Graph Styles

Graph Style: Az El Polar

A polar plot with elevation as radius and azimuth as angle theta over time, during access intervals. The azimuth and elevation describe the relative position vector between the base object and the target object. The relative position includes the effects of light time delay and aberration as set by the computational settings of the access. Az-El values are computed with respect to the default AER frame of the selected object of the Access Tool, as described below.

Reference Frames in AER Reports

AER reports for accesses are based on a default local coordinate system for every type of STK object.

For facilities, places, and targets the local coordinate system is LH.

  • Azimuth is referenced to X, positive towards Y (clockwise from above).
  • Elevation is referenced to X-Y plane, positive along negative Z.

For aircraft, ships, and ground vehicles the local coordinate system is VVLH CBF (Central Body Fixed).

  • Azimuth is referenced to X, positive towards Y (clockwise from above).
  • Elevation is referenced to X-Y plane, positive along negative Z.

For satellites and missiles the local coordinate system is VVLH CBI (Central Body Inertial).

  • Azimuth is referenced to X, positive towards Y.
  • Elevation is referenced to X-Y plane, positive along negative Z.

For other objects, the local coordinate system is found using the object's parent (or grandparent) as applicable.

LH (Local Horizontal)

X axis = constrained toward local north
Y axis = local east
Z axis = aligned with local geodetic nadir

VVLH (Vehicle Velocity, Local Horizontal)

X axis = constrained toward velocity vector
Y axis = perpendicular to X and Z.
Z axis = aligned with geocentric nadir


Data Provider:AER Data

Type: Time-varying data.

Availability: Graphs | Strip Charts

Graph Type: Polar90

Radius

rTitleElementTypeDimensionDescription
1ElevationElevationReal Number or TextAngleAngle measured from the XY-plane to the relative position vector. The value is positive depending on the sign of the Z component of the vector. See the reference frame description to determine whether a positive or negative Z component leads to a positive elevation angle value. The relative position vector reflects the access settings for light time delay, aberration, and refraction.

Angle

ThetaTitleElementTypeDimensionDescription
1AzimuthAzimuthReal Number or TextAngleDihedral angle from the X-axis to the relative position vector measured about the Z-axis. The value is positive when the vector has a positive Y component. The relative position vector reflects the access settings for light time delay, aberration, and refraction.