Chain: Access AER Data
Reports the azimuth, elevation and
range, computed via the Access Tool, as a function of time between
pairs of objects in a Chain during intervals in which the pair
participates in a strand that completes the chain. The report is
organized into sub-sections that report over each interval. The
pair that is being reported is shown as a title before the first
sub-section that includes intervals for that pair. Values are
reported during each strand access interval that lies within the
requested report 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.
Type: Time-varying data. Intended to be used only with
elements from this same data provider.
Availability: Reports | Graphs
Name |
Dimension |
Type |
Description |
Time |
DateFormat |
Real Number |
Time. |
Azimuth |
AngleUnit |
Real Number |
The apparent azimuth at the given time. |
Elevation |
AngleUnit |
Real Number |
The apparent elevation at the given time. |
Range |
DistanceUnit |
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 |
AngleRateUnit |
Real Number |
The rate of change of the apparent azimuth at the
given time. |
ElevationRate |
AngleRateUnit |
Real Number |
The rate of change of the Elevation angle. |
Strand Name |
Unitless |
Text |
The strand name. |
STK Programming Interface 11.0.1