Chain
Available Data Providers
| Name | Description |
|---|---|
| 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. |
| Access Data | Reports certain data, computed via the Access Tool, for a chain consisting of only two objects. The 'From-object' is the first object listed in the strand; the 'To-object' is the second object listed. Values are reported for each strand access interval that lies within the requested report intervals. |
| Angle Between | Reports certain data as a function of time, for each strand access interval that overlaps with the requested report time intervals.
The report is organized into sub-sections, where each subsection corresponds to a three object sub-strand of strands that complete the chain. If the data element "Strand Name" is not requested, then the sub-sections will be titled using the strand name and the three object sub-strand being reported. The report only computes data for strands consisting of at least three objects. |
| Base Object Data | Reports the number of accesses and a list of all objects having access from the base object for each strand that completes the Chain, as a function of time. The report is only valid for Chains consisting of two objects. |
| Collection of Interval Lists | A time component that produces a collection of related interval lists. |
| Complete Access | Reports the time intervals for which the chain is completed. These intervals are computed by overlapping all the strand accesses. |
| Data Provider Detail | Data Provider Detail - hierarchically list the available data providers and all of the included elements. |
| Data Provider Summary | Data Provider Summary - a list of all available data providers. |
| Definition | Reports the settings used by the Chain when computing available strands. You do not need to compute the Chain accesses before using these data providers. |
| ESD Data | Reports certain data during each strand access interval that lies within the requested report time intervals. The report is organized into sub-sections, where each subsection corresponds to a strand in the Chain. If the data element "Strand Name" is not requested, then the sub-sections will be titled using the strand name. The report only computes data for strands consisting of three objects. |
| Event Angle Between | Reports the angle made by three object strands at the start and stop time of each strand access interval that lies within the requested report time intervals. The report only computes data for strands consisting of three objects. |
| Event Data |
Reports certain data at defined event times during each interval, for strands consisting of only two objects. The 'From-object' is the first object listed in the strand; the 'To-object' is the second object listed. Values are reported for 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. |
| Interval | A time component that produces a single interval of time. |
| Interval List | A time component that produces an ordered list of time intervals. |
| Link Information | Link information provides the link budget for each Transmitter-Receiver link in a chain. The chain must model signal flow starting with a Transmitter and ending at a Receiver, possibly including transponders in between (where each transponder is modeled as a co-located Receiver-Transmitter pair). |
| Object Access | Reports time intervals for each object in a Chain for which the object participates in a strand that completes the chain.
The report is organized into sub-sections, where each subsection corresponds to an object in the Chain. If the data element "Strand Name" is not requested, then the sub-sections will be titled using the object name. |
| Optimal N Strands at Time | Reports the optimal strands by name and metric value for the sampled times when optimal strands exist based on computed Chain accesses. |
| Optimal Strand at Time | Reports the best optimal strand by name and metric value for the sampled times when optimal strands exist based on computed Chain accesses. |
| Range Data | Reports the apparent range 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. |
| Strand Access | Reports time intervals for each strand in a Chain that completes the chain.
The report is organized into sub-sections, where each subsection corresponds to a strand in the Chain. If the data element "Strand Name" is not requested, then the sub-sections will be titled using the strand name. |
| Strand Link Overlap | For each strand having access during the requested intervals, reports any other strand's accesses that overlap and the overlapping interval. |
| Strand Names | Lists the names of the objects in all valid strands for a computed Chain. The object names are reported as truncated paths separated by “to". |
| TCA Ephemeris Data | Reports data at the time of closest approach over each strand access interval, for all strands that have just two objects. The 'From-object' is the first object listed in the strand; the 'To-object' is the second object listed. Values are reported for each strand access interval that lies within the requested report intervals. |
| Time Array | A time component that produces intervals of time within which there are ordered arrays of times. |
| Time Instant | A time component that produces a single moment in time. |
| 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. |
| User Supplied Data | Values of custom data associated with the object. |