GPS CONSTELLATION STATUS
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GPS CONSTELLATION STATUS 2004 CGSIC. Captain John Butler 2 SOPS March 2004. Constellation Summary Since Sep 03 CGSIC. 29 operational on-orbit satellites 1 satellite launched (SVN 47: 20 Dec 03) 0 satellite disposed Component changes since Aug 2003

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GPS CONSTELLATION STATUS 2004 CGSIC

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Gps constellation status 2004 cgsic

GPS CONSTELLATION STATUS

2004 CGSIC

Captain John Butler

2 SOPS

March 2004


Constellation summary since sep 03 cgsic

Constellation SummarySince Sep 03 CGSIC

  • 29 operational on-orbit satellites

  • 1 satellite launched (SVN 47: 20 Dec 03)

  • 0 satellite disposed

  • Component changes since Aug 2003

    • SVN 23 (No Slot) Switched to Rubidium #2 (Last Clock)

    • SVN 25 Reaction Wheel #4 shutdown

    • SVN 36 switched to Cesium #3

  • Constellation changes since Aug 2003

    • SVN 23 (No Slot) Auto-Track began 5 Feb

    • SVN 23 (No Slot) Out of Service on 18 Feb


Subsystem status

Subsystem Status

Bottom Line

18 (1) vehicles are “yellow” (i.e. single string)

8 (1) vehicles are yellow due to bus failures

13 (1) vehicles are yellow due to nav failures


Clocks

Clocks

Bottom Line

SVNs 17, 23, 24, 31, and 32 on last clock


Out of service disposal timeline

Out of Service/Disposal Timeline

Proposed

IIR-12

Launch

25 May

SVN 23

Out of Service

Begins

12 Feb

Out of Service Decision Point

21 Jun 04

Auto-Track

29 Jan

IIR-11

Launch

8 Mar

SVN 23 Disposal

Window

27 Apr - 20 May

Aug 04

Feb 04

Mar 04

Apr 04

May 04

Jun 04

Jul 04

6-Week

Removal Process (23)


Constellation performance

Constellation Performance

All Errors Based on Dual Frequency, Signal in Space Only. Information Presented Reflects Data Collected During the Period from January 1, 2003 to December 31,2003. Thresholds Provided Reflect Average Location Requirements from SPS Signal Specification Dated October, 2001.

  • PDOP Availability:

  • Requirement - PDOP of 6 or Less, 98% of the Time or Better

  • Actual - 99.98385%

  • Horizontal Service Availability

  • Requirement - 95% Threshold of 36 meters, 99% of the Time or Better

  • Actual – 3.66 meters

  • Vertical Service Availability

  • Requirement - 95% Threshold of 77 meters, 99% of the Time or Better

  • Actual – 5.25 meters

  • User Range Error

  • Requirement - 6 meters or Less, Constellation Average

  • Actual - 1.23 meters


Gps constellation status 2004 cgsic

Navigation Accuracy YTD


Gps constellation status 2004 cgsic

Navigation Uploads per Day

GPS daily Uploads Count - Calendar Year 2003/2004

60

One Day All Counts

One Day Healthy Counts

50

40

# Uploads per Day

30

20

Data Gaps:

Jan 11 2003 04:45z - Jan 12 2003 00:00z

10

Feb 22 2003 04:15z - Feb 23 2003 22:45z

Data from Boeing

Apr 11 2003 17:30z - Apr 12 2003 01:30z

SPMA Archives

Jun 04 2003 18:00z - Jun 05 2003 00:00z

0

1

31

61

91

121

151

181

211

241

271

301

331

361

26

Day of Year 2003/2004


Current issues

Current Issues

Recent Anomalies

  • SVN35: Loadshed

  • SVN56: Unsuccessful SPU swap due to vehicle in Backup Ephemeris mode

  • SVN23(2):

  • SVN26: Default nav data due to overwrite of active page

  • SVN31: Baseband upset

  • Launch Schedule (based on NLF)

    • FY03: 2 IIR Accomplished

    • FY04: 4 IIR, 1 IIR Modified

    • FY05: 4 IIR Modified

    • FY06: 2 IIR Modified, 1 IIF

  • Launch Schedule supports continued robust

    GPS constellation


    Summary

    Summary

    • Current constellation provides healthy navigation signals

    • Launches are scheduled to sustain constellation health

    2 SOPS continues to ensure GPS

    performance supports user requirements


    Backups

    Backups


    Vehicle age launch through mmd

    Vehicle AgeLaunch through MMD

    Today

    17 (0) Past Design Life

    9 (+2) Past Updated MMD


    Gps space and control clock and reaction wheel performance status as of 1 january 2004

    GPS Space and ControlClock and Reaction Wheel Performance Status(as of 1 January 2004)

    Watch List

    Clock

    meets spec

    watch list

    dead

    unused

    in use

    Wheel

    functional

    watch list

    dead

    launch

    date

    SVN (PRN)

    Clock*

    Wheel

    1

    2

    3

    4

    1

    2

    3

    4

    * II/IIA = Rb, Rb, Cs, Cs

    IIR = Rb, Rb, Rb

    Diagonal Line = Unhealthy

    PLANE

    A

    B

    C

    D

    E

    F

    39A(09) 06/93

    56R(16) 1/03

    41R (14) 11/00

    24A (24) 07/91

    36A (06) 03/94

    51R (20) 05/00

    1

    SLOT

    46R (11)10/99

    30A(30) 9/96

    33A (03) 03/96

    26A (26)07/92

    25A (25)02/92

    47R(22)12/03

    2

    40A (10) 07/96

    43R(13) 07/97

    38A (08) 11/97

    44R(28) 07/00

    45R (21) 03/03

    31A (31) 03/93

    3

    34A (04) 10/93

    35A (05) 08/93

    54R (18) 01/01

    27A (27) 09/92

    32A (01) 11/92

    37A (07) 05/93

    4

    23A (23) 11/90

    29A (29) 12/92

    13 (02) 06/89

    15 (15) 10/90

    5

    17 (17)12/89

    6


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