Update on GPS Modernization Efforts 2 June 2015
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Space and Missile Systems Center Update on GPS Modernization Efforts 2 June 2015 Brig Gen William T. “Bill” Cooley Director, GPS Directorate PUBLICALLY RELEASABLE UNCLASSIFIED GSSAP SSA DSP DSCS COMMERCIAL COMM SBIRS WGS GEO MILSTAR Geostationary Earth Orbit GPS-III Optimal for (FUTURE) AEHF GPS-IIF Continuous Comm GPS-IIRM GPS-IIR GPS-IIA MEO Medium Earth Orbit Optimal for Global positioning, navigation & timing POLAR Optimal for DMSP Sun Sync/Global Weather ORS-1 Weather LEO Low Earth Orbit Optimal for Earth Sensing MILLSTONE HAYSTACK SBSS-10 • CCS SSA • SPACETRACK JMS VAFB AMOS GEODSS (NM) • GEODSS (DG) Eglin Radar • GEODSS (HI) • SPACE FENCE AFSCN GROUND STATIONS – Global Satellite Control C-Band Indian Ocean Micronesia Pacific Ocean Vandenberg AFB New Boston, NH Thule Air Base RAF Oakhanger CCAFS SST (AUS) DGS “REEF” GTS “GUAM” HTS “HULU” VTS “COOK” NHS “BOSS” TTS “POGO” TCS “LION” AEHF = Advanced Extremely High Frequency System, AFSCN = Air Force Satellite Control Network, CCAFS = Cape Canaveral Air Force Station, DMSP = Defense Meteorological Satellite Program, DSCS = Defense Satellite Communications, DSP = Defense Support Program System, EPS = Enhanced Polar System, GEODSS = Ground-based Electro-Optical Deep Space Surveillance System, GPS = Global Positioning System, GSSAP = Geosynchronous Space Situational Awareness Program, JSpOC = Joint Space Operations Center, ORS = Operationally Responsive Space, SBIRS = Space-Based Infrared System, SBSS = Space-Based Space Surveillance system, SSA = Space Situational Awareness, SST = Space Surveillance Telescope, VAFB = Vandenberg Air Force Base, WGS = Wideband Global Satellite Communications Global Positioning Systems Directorate S P A C E A N D M I S S I L E S Y S T E M S C E N T E R Mission: Acquire, deliver and sustain reliable GPS capabilities to America’s warfighters, our allies, and civil users From left to right, a GPS IIA, IIR-M, and IIF satellite Aviation & Maritime Ground Master Control Station (located at Schriever AFB, CO) BGen Bill Cooley Director Modernized GPS User Equipment (MGUE) Components PUBLICALLY RELEASABLE 3 How GPS Works S P A C E A N D M I S S I L E S Y S T E M S C E N T E R Keys to Performance GPS constellation consists of 24+ satellites Time: Atomic Clocks orbiting the earth at ~10,900 nautical miles Position: Ephemeris (Kalman Filter) (Medium Earth Orbit, MEO) in 6 Orbital Integrity: Worldwide monitoring planes at 55º inclination, Availability: Number of satellites L-Band Navigation Message Navigation Data: ephemeris (orbit) uploads containing & clock data; signals include: L-Band precise time and satellite • Civil: L1 C/A, L2C, L5, L1C (future) position (ephemeris) • Military: L1/L2 P(Y), L1/L2 M Tracking, Telemetry Track Navigation Payload & Control (TT&C) PNT Health and Performance on L-Band Signals Mission 2 Billion + S-Band GPS Users Process data from Monitoring A user requires a minimum of Stations and ground antennas. four satellites to determine time Generate commands to be sent to and position (t, X, Y, Z) SVs through the ground antennas Provide information to MCS to allow orbit & clock Ground Antennas estimation, ensure proper signal (4 dedicated and 7 shared) behavior and enable satellite message creation Master Control Station (MCS) (Schriever AFB, CO) Monitor Stations (6 Air Force,10 NGA ) Kalman Filter: heart of PNT Mission. Performs measurement updates every 15 minutes; estimates instantaneous state of GPS constellation PUBLICALLY RELEASABLE 4 GPS Overview S P A C E A N D M I S S I L E S Y S T E M S C E N T E R Civil Cooperation Department of Defense • 1+ Billion civil & commercial • Services (Army, Navy, AF, USMC) users worldwide • Agencies (NGA & DISA) • Search and Rescue • US Naval Observatory • Civil Signals • PNT EXCOMS – L1 C/A (Original Signal) • GPS Partnership Council – L2C (2nd Civil Signal) – L5 (Aviation Safety of Life) Maintenance/Security – L1C (International) • All Level I and Level II 38 Satellites / 31 Set Healthy – Worldwide Infrastructure Spectrum Baseline Constellation: 24 Satellites – NATO Repair Facility • World Radio Conference • Develop & Publish ICDs Semi-Annually • International Satellite Block Quantity Average Age Oldest – ICWG: Worldwide Involvement Telecommunication Union GPS IIA 3 21.5 24.4 • Update GPS.gov Webpage • Bilateral Agreements GPS IIR 12 13.3 17.7 • Load Operational Software on • Adjacent Band Interference GPS IIR-M 7 7.7 9.6 over 970,000 SAASM Receivers • International Committee GPS IIF 9 1.8 4.9 • Distribute PRNs for the World On Global Navigation Satellite Constellation 31 9.5 24.4 – 120 for US and 90 for GNSS Systems (GNSS) AS OF 20 APR 15 International Cooperation • 57 Authorized Allied Users – 25+ Years of Cooperation • GNSS – Europe - Galileo – China - COMPASS Department of Transportation – Russia - GLONASS • Federal Aviation Administration – Japan - QZSS Department of Homeland Security – India - IRNSS • U.S. Coast Guard PUBLICALLY RELEASABLE 5 GPS Modernization Program S P A C E A N D M I S S I L E S Y S T E M S C E N T E R GPS III Legacy GPS IIA/IIR GPS IIR-M GPS IIF • 4th civil signal (L1C) • Single Civil Frequency • 2nd Civil Signal (L2C) • 3rd civil signal (L5) • 4x better User Range Error (L1 C/A) • M-Code (L1M & L2M) • 2 Rb + 1 Cs Clocks than GPS IIF • P(Y)-Code (L1 & L2) • 12 year design life • Increased availability • Increased integrity • 15 year design life Legacy Operational Next Generation Operational Control System (OCX) Modernized GPS User Control Segment Equipment (MGUE) (AEP / LADO) OCX Block 0 OCX Block 1 • Mainframe system • Launch & On-Orbit • Replaces AEP for constellation C2 • Provides M-code access for • Command & Control Checkout of GPS III • M-Code military users • Robust cyber security • Signal monitoring • Increased anti-jam/anti-spoof • Launch and disposal • New civil signals & monitoring • Improved accuracy capabilities PUBLICALLY RELEASABLE 6 Accuracy: Civil Commitments Standard Positioning Service (SPS) Performance Standard S P A C E A N D M I S S I L E S Y S T E M S C E N T E R Standard Positioning Service (SPS) Signal-in-Space Performance 8 2008 SPS Performance Standard (PS) Worst of Any Healthy Satellite, 7.8 m @ 95% 7 2001 SPS PS 6 m RMS 6 Signal-in-Space User Range Error is the difference between a GPS satellite’s navigation data (position 5 and clock) and the truth, projected on the line-of-sight to the user Equivalent RMS Value from 2008 SPS PS (4 m) 4 Compare to (example): [VALUE]3.4 [VALUE] ≈ 4.9 m RMS User residual iono delay error (L1 only) [VALUE]3.1 [VALUE]3.2 3.3 [VALUE]3.1 ≈ 0.5 m RMS User residual tropo delay error [VALUE]3.0 [VALUE] 3 2.9 Worst of Any Healthy Satellite (95%) BetterPerformance 2 Across All Healthy Satellites (RMS, 68%) User Range Error (URE) in in Meters (URE) Error Range User 1.6 1 1.4 1.2 1.2 1.1 1.1 1.0 1.0 0.9 0.9 0.9 0.8 0.8 0.7 0 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 System accuracy better than published standard PUBLICALLY RELEASABLE 7 Accuracy: Military Commitments Precise Positioning Service (PPS) Performance Standard S P A C E A N D M I S S I L E S Y S T E M S C E N T E R Precise Positioning Service (PPS) Signal-in-Space Performance 6 2007 PPS Performance Standard (PS) Worst of Any Healthy Satellite, 5.9 m @ 95% 5 [VALUE]4.0 Signal-in-Space User Range Error is 4 the difference between a GPS satellite’s navigation data (position and clock) and the truth, projected on the line-of-sight to the user 3.3 3.3 3.0 3.1 3.1 3 2.9 2.8 Compare to (example): Equivalent RMS Value from 2007 PPS PS (3 m) ≈ 0.4 m RMS user residual iono delay error (L1+L2) ≈ 0.5 m RMS user residual tropo delay error 2 Worst of Any Healthy Satellite (95%) Across All Healthy Satellites (RMS, 68%) BetterPerformance 1.5 1 1.3 User Range Error (URE) in Meters 1.1 1.1 1.0 1.0 0.9 0.9 0.8 0.8 0.8 0.8 0.7 0.7 0 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 System accuracy better than published standard PUBLICALLY RELEASABLE 8 Now on The Air: Modernized Civil Signals S P A C E A N D M I S S I L E S Y S T E M S C E N T E R • The U.S. initiated CNAV message broadcast (L2C & L5) on 28 Apr 14 – Daily uploads (nominal procedure for satellite operations) began on 31 Dec 14 – L2C message currently set “healthy” – L5 message set “unhealthy” until sufficient monitoring capability established – Position accuracy not guaranteed during pre-operational deployment • User Range Error (URE) CNAV Performance Post – Daily uploads consistent with or exceed legacy navigation performance* – Inter-signal corrections enable single point positioning competitive with P(Y) receivers • Full potential of signals require receiver manufactures’ adoption – Challenge: Industry taking advantage of these signals moves capabilities forward! * Data from “Performance Evaluation of the Early CNAV Navigation Message”, Pstreigenberger, O. Montenbruck, U. Hessels; Study conducted in Europe. PUBLICALLY RELEASABLE 9 Modernized Space System: GPS IIF S P A C E A N D M I S S I L E S Y S T E M S C E N T E R • Nine total GPS IIFs on-orbit • Four GPS IIF launches in 2014! • Three additional GPS IIFs in the pipeline – SV-9 &12 are in storage; SV-11 at Cape • Prime: The Boeing Company • Upcoming launch dates: – GPS IIF-10 (SV-11) : 15 Jul 15 – GPS IIF-11 (SV-12): 30 Oct 15 – GPS IIF-12 (SV-9): NET 3 Feb 16 25 Mar 15: IIF-9 PUBLICALLY RELEASABLE 10 Modernized Space System: GPS III S P A C E A N D M I S S I L E S Y S T E M S C E N T E R • GPS III is the newest block of GPS satellites – 4 civil signals: L1 C/A, L1C, L2C, L5 • First satellites to broadcast