NAVSTAR GLOBAL POSITIONING SYSTEM

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NAVSTAR GLOBAL POSITIONING SYSTEM

• Constellation Summary and Performance

Lt Adam Fisher
GPS Navigation Payload Analysis 2nd Space
Operations Squadron 719.567.2110 (DSN 560)
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Constellation SummarySince 1 Jan 05

• 29 operational on-orbit satellites
• 1 satellite decommissioned
• SVN17 23 Feb 05
• Next upcoming launch
• SVN53 NET 22 Sep 05
• Component changes
• SVN31 switched to Cesium 3
• SVN27 switched to Cesium 4
• SVN35 switched to Rubidium 1

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Constellation Summary

• Anomaly Summary
• SVN37 (PRN7) 3 Apr Load-shed
• SVN31 (PRN31) 14 Apr Baseband reset
• SVN27 (PRN27) 14 May Rubidium 1 runoff leads
  to clock swap
• SVN26 (PRN26) 9 Jun Rubidium 1 clock jump
• SVN15 (PRN15) 22 Jun Comparator Reference
  Value Change
• SVN32 (PRN1) 24 Jul Load-shed
• SVN26 (PRN26) 21 Aug Crypto Variable Upload

2 SOPS WILL CONTINUE TO ENSURE GPS PERFORMANCE
SUPPORTS ALL USER REQUIREMENTS
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Navigation Performance
SEP Requirement 16m
CONSTELLATION EXCEEDS ALL PERFORMANCE
REQUIREMENTS
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Navigation Uploads Per Day
GPS daily Uploads Count 1 Jan to 29 Aug 05
GPS OPERATORS CONTINUE PROVIDING A SOLID, HEALTHY
NAV SIGNAL TO GLOBAL USERS
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GPS Locations as of 31 Aug 05
B2
30
34
A2
D4
25
160
61
Arg. of Latitude (deg)
D1
60
IIR-15
F4
120
C1
36
43
F3
B1
56
80
40
E3
A4
27
45
40
D3
EPOCH 1 Jul 93 1 May 05
33
29
A3
C2
38
0
Equator
F2
54
15
E4
59
26
C3
Watch List
320
B3
44
Empty Slot
47
E2
IIR-16
Block II
280
39
46
31
A1
D2
Block IIA
C4
37
41
F1
240
Block IIR
B4
35
51
32
E1
IIR-14
200
24
Potential Expanded Slot
A
C
B
E
D
F
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GPS Space and ControlClock and Reaction Wheel
Performance Status(as of 31 Aug 05)
Clock meets spec watch list dead unused in use
Wheel functional watch list dead
SVN (PRN)
launch date
Clock Wheel
2
3
4
1
2
3
4
1
II/IIA Rb, Rb, Cs, Cs IIR Rb, Rb,
Rb Diagonal Line Unhealthy
A
C
D
E
F
B
61R (2) 10/99
39A (09) 06/93
56R (16) 1/03
41R (14) 11/00
36A (06) 03/94
51R (20) 05/00
1
SLOT
25A (25) 02/92
33A (03) 03/96
46R (11) 10/99
26A (26) 07/92
47R (22) 12/03
30A (30) 9/96
2
43R (13) 07/97
44R (28) 07/00
38A (08) 11/97
40A (10) 07/96
45R (21) 03/03
59R (19) 03/04
3
35A (05) 08/93
34A (04) 10/93
54R (18) 01/01
60R (23) 06/04
27A (27) 09/92
37A (07) 05/93
4
29A (29) 12/92
31A (31) 03/93
15 (15) 10/90
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32A (01) 11/92
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Legacy- Accuracy Improvement Initiative (L-AII)

• 15-min National Geo-Spatial Intelligence Agency
  (NGA) smoothed data into Kalman Filter and by
  default user nav/timing service
• 6 NGA Monitor Stations (MS), in synergy with
  existing OCS stations
• Update to several mathematical models for
  ephemeris processing enhancements
• 6 phases of implementation, currently in Phase 4
• Overall L-AII user benefits 51.6 increase in
  Zero Age of Data
• 
  16.9 increase in Signal-In-Space
• Addition of 6 NGA MSs 100 coverage of all
  satellites 24/7
• Immediate anomaly detection, protecting users

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USAF NGA Monitor Stations
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Questions
GPS Navigation Payload Analysis 2nd Space
Operations Squadron 719.567.2110 (DSN 560)
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"JOINT" GPS OPERATIONS CENTER
A User Focused Center of Excellence
MAJOR CHUCK DANIELSDirector
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OVERVIEW

• History
• What We Do
• Effects-Based Ops

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Critical Data Exchange Poorly Supported
GPSOC BACKGROUND
Limited Data Flow

• User Planning Execution
• Is a problem with GPS impacting my ops RIGHT NOW?

• GPS Constellation Operations
• Are users supported RIGHT NOW?

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GPS OPERATIONS CENTERHistory

• 4 Jun 98 SECDEF letter to CINCSPACE (Gen
  Estes)
• established need for interference and anomaly
  resolution
• 6 Jul 98 CINCSPACE (Gen Estes) letter to
  SECDEF
• CIF s established GPS Support Center (910k)
• 1 Aug 98 CINCSPACE (Gen Myers) announces GSC
• The GPS Support Center is the single GPS point of
  contact in DoD
• 1999 DoD / DOT MOA, Annex 3
• establish the GSC as DoD focal point for
  reporting cases of GPS PVT service operational
  disruption or degradation.

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GPS OPERATIONS CENTERHistory

• 2 Apr 04 14AF/CC directed GSC to become GPS Ops
  Ctr
• Ribbon cutting by AFSPC/CV and 14AF/CC
• Placed GPS user operations under 2SOPS/CC
• 18 Jun 04 14AF/CC final signatory on GPSOC
  CONOPS
• Implemented first ever effects based operational
  direction for GPS
• 21 Feb 05 GPS Operations Center began 24/7
  coverage
• Contractor support in the 24/7 mission analysts
  positions

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GPS OPERATIONS CENTEROperational Direction

• the single point of contact within DoD to
• Detect, analyze, report and resolve GPS satellite
  Anomalies
• Facilitate resolution of radio frequency
  interference reports
• Monitor and report Precise Positioning Service
  performance
• Provide user equipment support to warfighter

To operate, employ, and maintain GPS to produce
desired effects in support of military and civil
operations across the full spectrum of
conflict GPSOC CONOPS 18 JUN 04
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GPS OPERATIONS CENTERCivil Operations Today

• Interface with NAVCEN and NOCC
• GPS Interference Detection and Mitigation
• Homeland Security and Critical National
  Infrastructure
• Information and Analysis Requests
• Aircraft crash investigations
• Timing issues
• Global and CONUS products posted daily
• Civils are largest global user group
• 20 of global military responsibilities are for
  Homeland Security (NORTHCOM)

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GPS OPERATIONS CENTERAchieving Effects Based
Operations
STRATCOM
JNWC
JSpOC
NOCC
GPS OPERATIONS CENTER
Maintenance
USNO
NAVCEN
Constellation
Analysis
Command Structure
Foreign Govt
Commercial
Navigation Warfare
Acquisition
NGA
AFTAC
User Operations
JPO
Allies
Warfighters
JSC
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QUESTIONS
MAJ CHUCK DANIELS Director, GPS Ops
Center Schriever AFB, CO
Comm719-567-5082 / 2541 vernon.daniels_at_schriever.
af.mil www.schriever.af.mil/gpssupportcenter