Characterizing the Effects of a Vertical Time Threshold for a Class of Well-Clear Definitions

@article{Upchurch2015CharacterizingTE,
  title={Characterizing the Effects of a Vertical Time Threshold for a Class of Well-Clear Definitions},
  author={Jason Upchurch and C{\'e}sar A. Mu{\~n}oz and Anthony Narkawicz and Maria C. Consiglio and P Chamberlain James},
  journal={Air traffic control quarterly},
  year={2015},
  volume={23},
  pages={275-299}
}
A fundamental requirement for the integration of unmanned aircraft into civil airspace is the capability of aircraft to remain well clear of each other and avoid collisions. This requirement has led to a broad recognition of the need for an unambiguous, formal definition of well clear. Any such definition must be interoperable with existing airborne collision avoidance systems (ACAS). A particular class of well-clear definitions uses logic checks of independent distance thresholds as well as… 

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References

SHOWING 1-10 OF 26 REFERENCES
The impact of a quantitative specification of a Well Clear Boundary on pilot displays for self separation
TLDR
The rationale for choosing the spatial threshold given a specified collision risk is discussed, limitations of a spatial-only approach to the definition of a well clear threshold are identified and how a modified-tau based approach can be used to minimize the likelihood of TCAS Resolution Advisories outside the Well Clear Boundary is illustrated.
A Family of Well-Clear Boundary Models for the Integration of UAS in the NAS
The FAA-sponsored Sense and Avoid Workshop for Unmanned Aircraft Systems (UAS) defines the concept of sense and avoid for remote pilots as "the capability of a UAS to remain well clear from and avoid
Investigating Effects of Well Clear Definitions on UAS Sense-And-Avoid Operations in Enroute and Transition Airspace
TLDR
Results indicate that, without any separation provision, a UAS would encounter a manned aircraft with a range tau of 60 seconds only every six hours, indicating the frequency with which a sense-andavoid system would create a nuisance alert.
Establishing a Risk-Based Separation Standard for Unmanned Aircraft Self Separation
Unmanned Aircraft Systems require an ability to sense and avoid other air traffic to gain access to civil airspace and meet requirements in civil aviation regulations. One sense and avoid function is
Concepts of Integration for UAS Operations in the NAS
One of the major challenges facing the integration of Unmanned Aircraft Systems (UAS) in the National Airspace System (NAS) is the lack of an onboard pilot that can comply with the legal requirement
UAS Integration into the National Airspace System: Modeling the Sense and Avoid Challenge
Deployed operations of unmanned aircraft systems in support of the Global War on Terrorism have established the value of this type of aircraft to effective military operations. This experience has
A TCAS-II Resolution Advisory Detection Algorithm
The Traffic Alert and Collision Avoidance System (TCAS) is a family of airborne systems designed to reduce the risk of mid-air collisions between aircraft. TCAS II, the current generation of TCAS
Computing risk for Unmanned Aircraft self separation with maneuvering intruders
  • J. Adaska
  • Engineering
    2012 IEEE/AIAA 31st Digital Avionics Systems Conference (DASC)
  • 2012
Safe integration of Unmanned Aircraft Systems (UAS) into the civil airspace requires the development of a sense and avoid (SAA) capability that enables UAS to remain "well clear" from other airborne
A horizontal miss distance filter system for suppressing false resolution alerts
TLDR
Any level to avoid a collision projection distance that is greater than the threshold of resolution intrusion alarm aircraft are prohibited, unless it is determined in the plane crash included one for maneuver.
Sense and avoid for unmanned aircraft systems
Sense and avoid (SAA) represents one of the main roadblocks to the integration of unmanned aircraft systems (UAS) operations by aviation authorities around the world. This tutorial outlines and
...
1
2
3
...