GPS Modernization: Road to the Future GPS IIR/IIR-M M and GPS III. Int l l Global Navigation Satellite Systems Society (IGNSS) 2009 symposium

Transcription

1 Int l l Global Navigation Satellite Systems Society (IGNSS) 2009 symposium November 30 th December 3 rd,2009 GPS Modernization: On the t Road to the Future GPS IIR/IIR-M M and GPS III Michael Shaw Director, Navigation Systems Global Business Development Lockheed Martin Space Systems Company

2 Overview GPS Modernization GPS IIR/IIR-M SVN-49 GPS IIIA The Road Ahead 1

3 GPS Operational Constellation GPS satellites provide continuous navigation signals on two L-band frequencies, L1 and L2 Baseline constellation is 24 satellites Current GPS constellation consists of 30 operational satellites (As of 28 November 2009) 11 Block IIA satellites 19 Block IIR satellites (Includes 7 IIR-M satellites) 3 additional inactive spares GPS Modernization Program in progress now GPS IIR/IIR-M comprise two thirds of current operational constellation 2

4 GPS Modernization Block IIA/IIR Basic GPS Std Service (16-24m SEP) Single frequency (L1) Coarse acquisition (C/A) code navigation Precise Service (16m SEP) Y-Code (L1Y & L2Y) Y-Code navigation Increasing System Capabilities Increasing Defense / Civil Benefit Block IIR-M, IIF IIR-M: IIA/IIR capabilities plus 2nd civil signal (L2C) M-Code (L1M & L2M) Anti-jam flex power IIF: IIR-M capability plus 3rd civil signal (L5) Anti-jam flex power Block III Block IIIA: Increased anti-jam power Increased security Increased accuracy Navigation surety Backward compatibility Assured availability Controlled integrity System survivability 4th civil signal (L1C) 3

5 GPS Space Segment Modernization Lockheed designed and built 21 GPS IIR satellites 1st successful IIR launch, 22 Jul 1997; 12 IIRs currently operational 1st IIR-M launch, 25 Sep 2005; 7 IIR-Ms currently operational Includes new 2 nd civil signal (L2C) and M-Code capabilities IIR-20(M), SVN-49, launched 24 Mar 2009; not yet available to users Included demonstration of the 3 rd civil signal, the L5 GPS IIR-21(M) launched on 17 August 2009; last GPS IIR-M satellite In May 08, Lockheed selected to design and produce GPS IIIA Initial contract for 2 GPS IIIA satellites with options for 10 production satellites Growth potential to support capability insertion program for IIIB/ IIIC 4

6 GPS IIR/IIR-M Performance Availability IIR Outage to Operational Ratio Constellation Availability 0.0% 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0% 100.0% Yellow Circle is Total Outage Time Red is Unscheduled SV Outage Time 90.0% 91.0% 92.0% 93.0% 94.0% 95.0% 96.0% 97.0% 98.0% 99.0% 100.0% Total Outage Time 99.0% 99.1% 99.2% 99.3% 99.74% 99.4% 99.5% 99.6% 99.7% 0.04% 0.08% 99.8% 0.10% 99.9% 0.04% 100.0% Total Availability Scheduled CS Outages UnscheduledCSOutages Scheduled SV Outages Unscheduled SV Outages IIR SV Lifetime Navigation Availability greater than 99.7% 100 years of successful IIR/IIR-M on-orbit operations as of May 09 5

7 GPS IIR/IIR-M M Performance Lifetime Estimated Range Deviations (ERDs) 5.0 Growing GPS IIR/IIR-M constellation consistently decreasing user error LAII AEP Sep-1997 Mar-1998 Sep-1998 Mar-1999 Sep-1999 Mar-2000 Sep-2000 Mar-2001 Sep-2001 Mar-2002 Sep-2002 Mar-2003 Sep-2003 Mar-2004 Sep-2004 Mar-2005 Sep-2005 Mar-2006 Sep-2006 Mar-2007 Sep-2007 Mar-2008 Sep-2008 Avg Daily Constellation Peak ERD -II/IIA Avg Daily Constellation Peak ERD - IIR Avg Daily Constellation Peak ERD - ALL Estimated Range Deviation (ERD) 6

8 SVN-49 - Signal Chronology Air Force acted to preserve spectrum filing with International Telecommunication Union (ITU) for L5, the 3 rd civil signal Required the signal begin operating from space by 26 Aug 2009 Lockheed awarded contract in April 2007 to develop and integrate a payload to provide an on-orbit demo of L5 signal Action was taken to mitigate risk of possible IIF launch delay Work was completed less than a year after contract award IIR-20(M) was launched 24 March 2009 The L5 demonstration payload was powered on 10 April 2009 Successfully brought the L5 frequency spectrum into use L1, L2 signal distortion detected shortly after payload activation 7

9 Root cause established SVN-49 - Signal Chronology Caused by signals reflecting off L5 filter and transmitted through satellite antenna Overall effect is a permanent, static multipath signal being generated within the satellite Effects are most prominent on the portion of antenna whose influence is greatest at high elevation angles Signal distortion is user elevation angle dependent, with little or no distortion at low elevation angles Meets GPS SPS and PPS Performance Standards 8

10 Key Considerations for Way Forward No consensus from user equipment (UE) manufacturers Updating software in fielded UE very challenging Some UE may be impossible to update SVN-49 remain unhealthy until mitigations in place Allows time to develop and implement Control Segment and/or Civil/Military receiver mitigations Intend to set SVN-49 healthy; not if but when Constellation is very robust today Can take a long term focus in developing the mitigation 9

11 GPS III Overview Next Generation GPS Improved performance for both war-fighter and civilian users Superior system security, accuracy, and reliability Strategic Teammates U.S. Air Force (Los Angeles, CA) LM Space Systems Company (Newtown, PA) ITT Corporation (Clifton, NJ) General Dynamics (Scottsdale, AZ) Heritage of Success GPS IIR/IIR-M success Time-tested A2100 bus Low risk solution to satisfying on-going GPS modernization 10

12 GPS III Provide new critical high-value GPS space capabilities; constellation sustainment Improved accuracy and power for both military and civilian users Additional 4 th civil signal (L1C) Enhanced M-code Earth Coverage power Deliver a high-confidence acquisition "Back to Basics" program execution Time-certain development for on-time launch availability Avoid previous space program acquisition problems Unnecessary technical, cost and schedule risks Cost overruns and schedule delays Graceful growth path for inserting possible future capabilities (GPS IIIA IIIB IIIC) Artist conception of GPS IIIA vehicle Low risk solution to satisfying on-going GPS modernization 11

13 GPS III Capability Insertion GPS IIIA (8 planned) Increased accuracy (0.63 m spec) Increased Earth Coverage Power Additional civil signal (L1C) Interoperable with Galileo and Japan's QZSS Bus capacity for IIIB and IIIC GPS IIIB (8 planned) Real-time command and control cross-links Allows upload of satellites via single contact Improves constellation accuracy GPS IIIC (16 planned) High-power spot beam Provides increased anti-jamming capability for military Flexible transition and content of future blocks reduces program risk 12

14 A2100 History A2100 modular design accommodates wide range of payloads and launch vehicles Increased on-orbit reliability Features parts reduction/simplified construction Proven production cycle time Exceptional earth pointing reliability Thirty-eight A2100s on-orbit today 1st A2100 in operation for over 13 years No satellite vehicle failures after over 250 spacecraft-years accumulated to date Received an Award for Satellite Reliability as the Most reliable and efficient of its class Key customers: SES World Skies Echostar Telesat SES ASTRA SPJSAT BSAT US Air Force US Navy NASA A2100AX vehicle at Newtown facility GPS III built on highly reliable and adaptable satellite bus platform 13

15 GPS III Schedule May 2008 Oct 2008 May 2009 Fall nd Qtr 2014 Pre-Award - Risk mitigation Contract Award - 72 months to 1st launch Integrated Baseline - Technical - Schedule - Performance Preliminary Design - Multiple subsystem and element reviews Critical Design - Multiple subsystem and element reviews Production and Test - Engineering Models - Component Qualification - Flight Production First IIIA Ready for Launch First IIIA Mission * notional representation 2-4 missions per year Final IIIC Mission Preliminary Design Assessment May 2009: Program On-cost, on-schedule, meets/exceeds all technical specs 14

16 The Road Ahead GPS modernization is in progress New GPS signals for both military and civil users GPS IIR/IIR-M generation complete More than 100 years successful on-orbit performance Currently comprises two thirds of on-orbit GPS constellation Foundation of GPS constellation for a number of years to come GPS III generation is coming in 2014 Program is on schedule and successfully moving forward Will bring new capabilities for global users Compatible and interoperable with other international systems such as European Galileo and Japan s QZSS 15

17 Thank you 16