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.
Available for these objects: Chain
Type: Interval data. Intended to be used only with elements from this same data provider.
Availability: Reports | Graphs
Data Provider Elements
| 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 | Lists the names of the objects in the best strand of the stored best strands. The object names are reported as complete paths separated by “to". |
| Start Time | Date | Real Number or Text | Beginning of an interval. |
| Start Azimuth | Angle | Real Number or Text | The apparent azimuth at the start time of the interval. |
| Start Elevation | Angle | Real Number or Text | The apparent elevation at the start time of the interval. |
| Start Range | Distance | Real Number | The apparent range at the start time of the interval. |
| Stop Time | Date | Real Number or Text | End of an interval. |
| Stop Azimuth | Angle | Real Number or Text | The apparent azimuth at the stop time of the interval. |
| Stop Elevation | Angle | Real Number or Text | The apparent elevation at the stop time of the interval. |
| Stop Range | Distance | Real Number | The apparent range at the stop time of the interval. |
| Duration | Time | Real Number | The duration of the interval. |