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Agenda Item Wind Turbine Interference – Possible Mitigations. Jason Strong, Eng Mgr Surveillance Sensors NATS En-Route Ltd. Mitigation Options. Guidelines includes a variety of mitigation options which should be considered.

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agenda item wind turbine interference possible mitigations

Agenda Item Wind Turbine Interference – Possible Mitigations

Jason Strong, Eng Mgr Surveillance Sensors

NATS En-Route Ltd

mitigation options
Mitigation Options
  • Guidelines includes a variety of mitigation options which should be considered.
  • The choice and appropriateness of mitigation options varies from case to case, influenced by:
    • Surveillance technology employed
      • Cooperative / Non-Cooperative
      • Age & Capability
      • Capacity
      • Supportability
    • Air Traffic Density
      • Number of flights per Hour
      • Airspace Volume
    • Air Traffic Complexity
      • Mix of Aircraft
      • Military / State Aircraft
      • En-Route or Terminal Control

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010

mitigation applicability
Mitigation Applicability
  • Guidelines Identifies different options for different Surveillance Classifications
    • Non-Cooperative Surveillance Sensor
    • Cooperative Surveillance Sensors
    • Operational
    • Wind Turbine
  • It is rare & unlikely that a single mitigation technique is sufficient on its own. Often a combination of options needs to be employed.

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010

risks identified requiring mitigation
Risks identified requiring mitigation
  • Reduced PSR Probability of Detection (Pd)
  • PSR False Targets
  • PSR Positional Accuracy
  • Overload of PSR Capabilities (Capacity)
  • Reduced SSR Pd
  • SSR False Targets
  • SSR Position Accuracy
  • Guidelines identify which mitigations are effective at addressing each type of risk.

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010

mitigation options table 1 page 48
Mitigation Options Table 1 – Page 48

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010

mitigation options table 2 page 49
Mitigation Options Table 2 – Page 49

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010

non cooperative surveillance sensor
Non-Cooperative Surveillance Sensor
  • Blank Azimuth Sector
  • Suppress returns in a range / azimuth sector
  • Filtering of Wind Farm false returns
  • Strengthen Track Initiation Conditions
  • Adapt PSR overload prevention facilities
  • Upgrade PSR processing capabilities
  • Upgrade PSR output interface capabilities
  • In-Fill PSR
  • In-Fill MSPSR

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010

psr blanking
PSR Blanking
  • Either a whole azimuth sector or range defined.
  • Effective way of addressing clutter & capacity related issues.
  • Obvious drawback of blanking out real aircraft returns
  • Maybe be suitable in certain operational situations, e.g.:
    • Low Risk of non-cooperative aircraft
    • Low complexity
    • Low traffic density

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010

psr processing
PSR Processing
  • Improved Processing Techniques
    • Increase Probability of Detection
    • Reduce the number of false plots
    • Improve the acquisition of targets through enhanced track initiation techniques
    • Use of Non-Auto Initiation zones
  • Several manufacturers looking at enhancements to existing technology or new/alternative replacement technology
  • Complex solution but potentially offers the most ‘complete’ mitigation option.

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010

surveillance in fill
Surveillance ‘In Fill’
  • Applicable to both cooperative & non cooperative surveillance
  • Places more emphasis mitigation at the end user rather than the Radar Head
  • Requires a surveillance picture to be built up from multiple surveillance sensors
    • Mosaic solution
    • Multi-Radar Tracking solution
  • Effective solution but limited in number of applications due to:
    • Computational limitations
    • Finite maximum number of surveillance sensors
    • Accuracy requirements

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010

cooperative surveillance system
Cooperative Surveillance System
  • Blank SSR Transmission in an azimuth sector
  • In-Fill SSR
  • In-Fill Wide Area Multilateration (WAM)
  • In-Fill ADS-B
  • Improve SSR Anti-Reflection capability / Mode-S

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010

operational
Operational
  • Move ATC Route
  • Change airspace classification or create a Transponder Mandatory Zone

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010

wind turbine
Wind Turbine
  • Move Turbines to outside Radar Line of Site
  • Move Turbines out of Critical Areas
  • Change Windfarm layout
  • Reduce number of turbines within Line of Site
  • Reduce Wind Turbine Reflectivity

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010

jason strong
Jason Strong

Engineering Manager, Surveillance Sensors

Jason.strong@nats.co.uk

+44 1489 444701

NATS,

Corporate & Technical Centre,

4000/4200 Parkway

Whiteley,

Fareham,

Hampshire.

UK

PO15 7FL

Sustainable Energy – Sustainable ATC Surveillance Workshop – Eurocontrol, Brussels, April 2010