Access AER Data
Reports azimuth, elevation, and range (AER) over time between access pairs in the strands of a Chain. The report is organized into subsections, one subsection per pair. Each subsection reports 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 reported 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.
Available for these objects: Chain
Type: Time-varying data. Intended to be used only with elements from this same data provider.
Availability: Reports | Graphs
Data Provider Elements
| Name | Dimension | Type | Description |
|---|---|---|---|
| Time | Date | Real Number or Text | Time. |
| Azimuth | Angle | Real Number or Text | The apparent azimuth at the given time. |
| Elevation | Angle | Real Number or Text | The apparent elevation at the given time. |
| Range | Distance | Real Number | The apparent range between the two objects at the given time. |
| RangeRate | Rate | Real Number | The rate of change of the apparent range between the objects at the given time. |
| AzimuthRate | AngleRate | Real Number | The rate of change of the apparent azimuth at the given time. |
| ElevationRate | AngleRate | Real Number | The rate of change of the Elevation angle. |
| Strand Name | Unitless | Text | The strand name. |