1. Document Number Here © 2009 The MITRE Corporation. All rights reserved. For Internal MITRE Use Document Number Here © 2009 The MITRE Corporation. All rights reserved. For Internal MITRE Use Wide Area Mulilateration Coverage for High Altitude Airspace Work in Progress

2. Document Number Here © 2009 The MITRE Corporation. All rights reserved. For Internal MITRE Use Dilution of Precision Analysis  100% passive multilateration coverage only  Assumes no uplinks (equivalently, no uplink limitations)  Assumes multilat system continues to operate normally during a GPS outage  Requires three stations in view (time difference of arrival constraint)  Includes geometry constraints (i.e., HDOP)  Assumes multilat system successfully resolves any position ambiguities  Assumes maximum range of 200 NM  Consistent with Mode S transponders (not UAT)  Does include line-of-sight blockage by terrain  Based on actual antenna heights 22

3. Document Number Here © 2009 The MITRE Corporation. All rights reserved. For Internal MITRE Use DOP Coverage at 18,000 ft. MSL DME OnlyITT GBT Only DME & GBT Preliminary Results

4. Document Number Here © 2009 The MITRE Corporation. All rights reserved. For Internal MITRE Use DOP Coverage at 24,000 ft. MSL DME OnlyITT GBT Only DME & GBT Preliminary Results

5. Document Number Here © 2009 The MITRE Corporation. All rights reserved. For Internal MITRE Use Backup

6. Document Number Here © 2009 The MITRE Corporation. All rights reserved. For Internal MITRE Use “Better than Best Case” Analysis  100% passive multilateration coverage only  Assumes no uplinks (equivalently, no uplink limitations)  Assumes multilat system continues to operate normally during a GPS outage  Requires three stations in view (time difference of arrival constraint)  Does not include geometry constraints (e.g., HDOP)  Assumes multilat system successfully resolves any position ambiguities  Assumes maximum range of 200 NM  Consistent with Mode S transponders (not UAT)  Does include line-of-sight blockage by terrain  Based on actual antenna heights  First cut: ADS-B sites only  Next step: ADS-B sites plus FAA DME sites 66

7. Document Number Here © 2009 The MITRE Corporation. All rights reserved. For Internal MITRE Use Color Codes for Coverage Maps  This initial step involves a cross-check between two models: RACOMS and Beam  Line-of-sight coverage count  Orange = 3 sites provide coverage  Green = at least 4 sites provide coverage 77

8. Document Number Here © 2009 The MITRE Corporation. All rights reserved. For Internal MITRE Use ITT Site Coverage at 18,000 ft. MSL Beam Preliminary results from cross-check between two models: ADS-B sites only 88 RACOMS

9. Document Number Here © 2009 The MITRE Corporation. All rights reserved. For Internal MITRE Use ITT + DME Site Coverage at 18,000 ft. MSL Beam Preliminary results from cross-check between two models: ADS-B sites only 99 RACOMS

10. Document Number Here © 2009 The MITRE Corporation. All rights reserved. For Internal MITRE Use ITT Site Coverage at 24,000 ft. MSL Beam Preliminary results from cross-check between two models: ADS-B sites only 10 RACOMS

11. Document Number Here © 2009 The MITRE Corporation. All rights reserved. For Internal MITRE Use ITT + DME Site Coverage at 24,000 ft. MSL Beam Preliminary results from cross-check between two models: ADS-B sites only 11 RACOMS