Styles by Object | Chain Report Styles | Chain Graph Styles

Graph Style: Access AER

A plot of the azimuth, elevation, and range (AER) over time between access pairs in the strands of a Chain. The plot for each pair is shown over intervals that are the intersection of the pair's access intervals with the Chain's complete access intervals.

The azimuth and elevation angles are computed with respect to a frame determined by the first object. The azimuth angle is the angle from the X axis (positive about the Z-axis) to the projection of the apparent relative position vector into the XY plane. The elevation is the angle of the apparent relative position vector from the XY plane, with positive angles being used when the vector has a negative Z component.

When the first object is a Facility, Place, or Target, the XYZ frame is Topocentric (X aligned with North, Y aligned with East, and Z aligned with the detic nadir of the detic subpoint of the first object with respect to its central body).

When the first object is a Satellite, Missile, or LaunchVehicle, the XYZ frame is CbiVVLH (inertial vehicle velocity local horizontal frame, with the Z axis aligned with the anti-radial direction and the X axis constrained toward the inertial velocity direction).

When the first object is an Aircraft, GroundVehicle, or Ship, the XYZ frame is CbfVVLH (fixed vehicle velocity local horizontal frame, with the Z axis aligned with the anti-radial direction and the X axis constrained toward the central body fixed velocity direction) when the central body fixed velocity is not close to zero; when the velocity is close to zero, then the Topocentric frame is used.

When the first object is a Sensor, then the frame is determined by its parent object as described above.

Data Provider:Access AER Data

Type: Time-varying data. Intended to be used only with elements from this same data provider.

Availability: Graphs

Graph Type: Time XY

Number of Axes: 2

Y Axis: Angle

Curve	Title	Element	Type	Dimension	Description
1	Azimuth	Azimuth	Real Number or Text	Angle	Dihedral 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.
2	Elevation	Elevation	Real Number or Text	Angle	Angle 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.

Y2 Axis: Distance

Curve	Title	Element	Type	Dimension	Description
1	Range	Range	Real Number	Distance	Magnitude of the relative position vector. The relative position vector reflects the access settings for light time delay, aberration, and refraction.