Access Defaults

Access Default application options allow you to set the default values for the following access computation options:

Star objects are always modeled with total (stellar) aberration, regardless of the Aberration Type and Use Light Time Delay settings.

Option	Description
Maximum Step Size	Use this option in new access computations. The maximum step size limits the amount of time that is allowed to elapse between samplings of the constraint functions during access computations. The value specified here is the default value for Access tool windows when they are created, and you can use the Advanced button on the Access tool to override it.
Minimum Step Size	The minimum step size that is allowed to be taken.
Time Convergence	This option sets the time tolerance that is used by the access algorithms to determine the start times and stop times of access intervals. The event detection routine declares that an event is found when either the value of the access constraint converges to the desired value within 8 digits or the time interval in which the event lies is within the time tolerance.
Value Tolerance	Parameters controlling event detection based upon a constraint value: Relative: An event is said to be detected when a constraint value's relative difference compared to the previous sample is within this tolerance: (value - previousValue) / value <relativeTolerance>) values near zero use the absolute tolerance requirement instead. Absolute: The criterion used for convergence in value for values near 0. An event is said to be detected when a constraint value's difference compared to the previous sample is within this tolerance: (value - previousValue) <absoluteTolerance>) The default values have been shown to provide robust and accurate event detection over a wide variety of problems.
Use Light Time Delay	Choose whether to consider light time delay in access computations. When light time delay is not considered, aberration is ignored also.
Light Time Delay Convergence	This option sets the tolerance used when iterating to determine the light time delay. The iteration stops when the improvement in the value is less than this tolerance.
Aberration Type	This option sets the model of aberration to be used in access computations. The values are: None. Ignores aberration. Annual. Considers annual aberration only. Thus, aberration is applied only in cases where the light time delay is computed using the solar system barycenter frame. Total. Applies the full aberration correction, when light time delay is computed.
Preferred Time Sense	Controls the default directionality for access computations to be either transmit or receive. Use to set the preferred directionality for access computations in situations where no directionality is specified. For example, it affects Access, Chains, and DeckAccess but not Coverage or targeted Sensors.
Auto Add "Access Intervals" to Timeline	Sets the default value for automatically adding Access time intervals to the Timeline View when Access is computed.