Auto ACAS Automatic Air Collision Avoidance System The brief brief brief one.

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Auto ACASAutomatic Air Collision Avoidance
SystemThe brief brief brief one.

• Bengt-Göran Sundqvist
• Saab Aerosystems
• 2005-02-02

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Historic perspective Losses of 37 Viggen
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Auto ACAS - Cooperation
2000
2001
2002
2003
Koncept
Developm.
Implementation
Flight test
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Auto ACAS Objective/Customer requirements

• Flight Test Demonstrate a system providing
• Protection through an automatic escape maneuver
• No-nuisance operation, i.e. not interfere with
  normal operation (incl. Air Combat, Formation
  flight etc)
• Fail-Safe operation
• System designed as emergency last resort and
  aimed for both manned and unmanned A/C (UAV)

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The concept Auto ACAS
Intuitive to first identify a collision ..
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The concept Auto ACAS
Auto ACAS does not predict future collision. It
continuously optimizes coordinated escape
maneuvers. The maneuver is executed when these
claimed spaces intersect (in time and space).
and compute coordinated escape maneuvers.
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The concept Auto ACAS
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Summary Auto ACAS concept

• Does not predict collision.
• Continuously claims space, for the own escape
  maneuver, which is optimized against claimed
  spaces of other AC.
• The size of the space depends on the physical
  size of the AC and a number of uncertainties. The
  size varies continuously as a function of these.
• Automatically activates a safe escape maneuver
  when the optimized spaces intersect (in time and
  space).
• The AC flies in the claimed space during the
  activation.

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Pros using the Auto ACAS concept

• Safe as all uncertainties are accounted for in
  the size of the claimed space. All AC ensure that
  the own fly-out will stay within the own
  transmitted claimed space.
• Nuisance free as the maneuver is deterministic
  for all AC it can be estimated with high fidelity
  and the uncertainties are thus kept small.
• Handles dynamic situations (continuously
  optimized escape maneuvers for all AC).
• Requires no handshaking (same optimization)
• Easily adoptable to new platforms
• Fail-safe
• Robust against link drop-outs

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Cons using the Auto ACAS concept

• ACAS will require transmission of data over the
  link, this can limit the transmission of tactical
  data.
• Full operation is not safe in an out-of-network
  environment.
• Complex - to fulfill requirements, given the
  limitations and uncertainties, requires heavy
  algoithms.

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Formation flight logic
When in Close formation all activations are
inhibited.all other aircraft yield to formation
flying aircraft.When in Inhibit the
activation is inhibited against the specific
aircraft. full ACAS functionality against other
aircraft.The logic is by-passed during
activation.