Chain: Time Ordered Access
Reports access information for each
strand access interval for a Chain consisting of just two objects.
The time intervals are sorted using the start time of each strand
access interval. 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: Interval data. Intended to be used only with elements
from this same data provider.
Availability: Reports | Graphs
Name |
Dimension |
Type |
Description |
Access Number |
Unitless |
Integer |
A count of the intervals. |
Strand Name |
Unitless |
Text |
The name of object. |
Strand Name (Long) |
Unitless |
Text |
The full path to an object. |
Start Time |
DateFormat |
Real Number |
The start time of an interval. |
Start Azimuth |
AngleUnit |
Real Number |
The apparent azimuth at the start time of the
interval. |
Start Elevation |
AngleUnit |
Real Number |
The apparent elevation at the start time of the
interval. |
Start Range |
DistanceUnit |
Real Number |
The apparent range at the start time of the
interval. |
Stop Time |
DateFormat |
Real Number |
The stop time of an interval. |
Stop Azimuth |
AngleUnit |
Real Number |
The apparent azimuth at the stop time of the
interval. |
Stop Elevation |
AngleUnit |
Real Number |
The apparent elevation at the stop time of the
interval. |
Stop Range |
DistanceUnit |
Real Number |
The apparent range at the stop time of the
interval. |
Duration |
TimeUnit |
Real Number |
The duration of the interval. |
STK Programming Interface 11.0.1