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GPS L5

GPS L5. Dr. Chris Hegarty L2/L5 Industry Day May 2, 2001. 1. Background. 1996 - GPS Presidential Decision Directive (PDD) Comprehensive national policy on GPS and augmentations Interagency GPS Executive Board (IGEB) established

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GPS L5

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  1. GPS L5 Dr. Chris Hegarty L2/L5 Industry Day May 2, 2001 1

  2. Background • 1996 - GPS Presidential Decision Directive (PDD) • Comprehensive national policy on GPS and augmentations • Interagency GPS Executive Board (IGEB) established • February 1997 - Department of Defense (DoD) and Department of Transportation (DoT) agree to provide a second civil GPS frequency • March 1998 - VP Gore announces IGEB decision to implement two new civil signals • January 1999 - VP Gore announces third civil signal frequency selection - 1176.45 MHz

  3. Background (continued) • February 1999 - IGEB Third Civil Signal Implementation Steering Group formed • Established relationship between IGEB and RTCA for development of L5 signal requirements • November 1999 - IGEB report Implementation of a Third Civil GPS Signal completed • Recommended implementing L5 with: • 6 dB higher minimum received signal power than L1 C/A code • 10.23 Mchip/second spreading codes on quadrature channels (no data on one channel) • Other recommendations regarding coexistence of L5 with existing systems operating at/near 1176.45 MHz • Link 16 • Distance Measuring Equipment (DME)/Tactical Air Navigation (TACAN)

  4. Feb. - Nov. ‘99 IGEB Organization Interagency GPS Executive Board (IGEB) Executive Secretariat Third GPS Signal Implementation Steering Group WG 2 WG 3 WG 4 WG 1 Technical Feasibility of Coexistence Cost Issues/ Operational Impacts Signal Requirements International Coordination RTCA, Inc (SC 159 WG1) GPS WP8D GPS International Outreach Group

  5. Current IGEB L5 Activities • Working Group 1 -Validation of Coexistence • Addresses follow-on work recommendations from Nov. 1999 IGEB report • Co-chaired by Dr. Hegarty (MITRE)/Mr. Williams (JSC) • Working Group 2 – L5 Signal Specification • Chaired by Dr. Hegarty (MITRE)

  6. Present IGEB Organization Interagency GPS Executive Board (IGEB) Senior Steering Group Executive Secretariat WG 1 WG 2 Validation of Coexistence Signal Specification RTCA, Inc (SC 159 WG1)

  7. L5 Signal Specification Schedule • December 2000 • RTCA Program Management Committee (PMC) approved L5 Signal Specification • Received formal civil coordination through the extended DOT Positioning/Navigation Executive Committee, with all agencies concurring • February 2001 - DoD review completed and comments provided to DOT • April 2001 - DOT response to comments • October 2001 - Threshold date for 1st release of Interface Control Document (ICD) GPS-705

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