Description
Returns a sequential listing of events related to the proximity of two objects. It provides the entry time and exit time of one object moving within the user specified range of another object, as well as the time and range of closest approach, and the time and range of greatest separation. The times and ranges are computed through one of two user-selectable formulations of the Alfano Negron Close Approach Software (ANCAS) interpolation algorithms.
Note that the ANCAS algorithms rely on crossing a range threshold in order to kick off the algorithm, so if two objects are always within the threshold or outside the threshold the no events will be reported. The ANCAS algorithms are designed to work well for high-relative velocity conjunctions and the results won't be as accurate for low-relative velocity conjunctions. For more information on the ANCAS algorithms, please refer to: Alfano, Salvatore. Determining Satellite Close Approaches, Part II. Journal of the Astronautical Sciences 42.2. Apr-Jun 1994, 143-152.
Timing Precision Mode
This page describes functionality in nanosecond timing precision mode.
Click here to see the documentation for this object in millisecond timing precision mode.
Overload List
Signatures
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Return Value
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Description
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Spacecraft.CloseApproachRange(Variable rangeLimit, GroundStation rangingStation)
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String
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Returns a sequential listing of events related to the proximity of the calling Spacecraft and the argument rangingStation using ANCAS 1 interpolation method. This method uses the position and velocity states from three data points to create a quintic polynomial approximating the range between the two objects over time.
For more information on the ANCAS algorithms, please refer to: Alfano, Salvatore. Determining Satellite Close Approaches, Part II. Journal of the Astronautical Sciences 42.2. Apr-Jun 1994, 143-152.
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Spacecraft.CloseApproachRange(Variable rangeLimit, Spacecraft rangingSpacecraft)
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String
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Returns a sequential listing of events related to the proximity of the calling Spacecraft and the argument rangingSpacecraft using ANCAS 1 interpolation method. This method uses the position and velocity states from three data points to create a quintic polynomial approximating the range between the two objects over time.
For more information on the ANCAS algorithms, please refer to: Alfano, Salvatore. Determining Satellite Close Approaches, Part II. Journal of the Astronautical Sciences 42.2. Apr-Jun 1994, 143-152.
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Spacecraft.CloseApproachRange(Variable rangeLimit, GroundStation rangingStation, Variable Algorithm)
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String
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Returns a sequential listing of events related to the proximity of the calling Spacecraft and the argument rangingStation using the specified Algorithm.
For more information on the ANCAS algorithms, please refer to: Alfano, Salvatore. Determining Satellite Close Approaches, Part II. Journal of the Astronautical Sciences 42.2. Apr-Jun 1994, 143-152.
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Spacecraft.CloseApproachRange(Variable rangeLimit, Spacecraft rangingSpacecraft, Variable Algorithm)
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String
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Returns a sequential listing of events related to the proximity of the calling Spacecraft and the argument rangingSpacecraft using the specified Algorithm.
For more information on the Alfano/Negron Close Approach Software (ANCAS) algorithms, please refer to: Alfano, Salvatore. Determining Satellite Close Approaches, Part II. Journal of the Astronautical Sciences 42.2. Apr-Jun 1994, 143-152.
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Spacecraft.CloseApproachRange(Variable rangeLimit, GroundStation rangingStation, TimeSpanArray EventTime, Array EventType, Array EventRange)
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Variable
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Returns a sequential listing of events related to the proximity of the calling Spacecraft and the argument rangingStation using ANCAS 1 interpolation method. This method uses the position and velocity states from three data points to create a quintic polynomial approximating the range between the two objects over time.
For more information on the ANCAS algorithms, please refer to: Alfano, Salvatore. Determining Satellite Close Approaches, Part II. Journal of the Astronautical Sciences 42.2. Apr-Jun 1994, 143-152.
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Spacecraft.CloseApproachRange(Variable rangeLimit, Spacecraft rangingSpacecraft, TimeSpanArray EventTime, Array EventType, Array EventRange)
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Variable
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Returns a sequential listing of events related to the proximity of the calling Spacecraft and the argument rangingSpacecraft using ANCAS 1 interpolation method. This method uses the position and velocity states from three data points to create a quintic polynomial approximating the range between the two objects over time.
For more information on the ANCAS algorithms, please refer to: Alfano, Salvatore. Determining Satellite Close Approaches, Part II. Journal of the Astronautical Sciences 42.2. Apr-Jun 1994, 143-152.
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Spacecraft.CloseApproachRange(Variable rangeLimit, GroundStation rangingStation, Variable Algorithm, TimeSpanArray EventTime, Array EventType, Array EventRange)
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Variable
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Returns a sequential listing of events related to the proximity of the calling Spacecraft and the argument rangingStation using the specified Algorithm.
For more information on the ANCAS algorithms, please refer to: Alfano, Salvatore. Determining Satellite Close Approaches, Part II. Journal of the Astronautical Sciences 42.2. Apr-Jun 1994, 143-152.
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Spacecraft.CloseApproachRange(Variable rangeLimit, Spacecraft rangingSpacecraft, Variable Algorithm, TimeSpanArray EventTime, Array EventType, Array EventRange)
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Variable
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Returns a sequential listing of events related to the proximity of the calling Spacecraft and the argument rangingSpacecraft using the specified Algorithm.
For more information on the ANCAS algorithms, please refer to: Alfano, Salvatore. Determining Satellite Close Approaches, Part II. Journal of the Astronautical Sciences 42.2. Apr-Jun 1994, 143-152.
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See also
Spacecraft Object
Spacecraft Propagation Guide
Coverage and Contact Analysis Guide
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