gps operations cgsic brief 15 september 08 lt joe riedesel 2d space operations squadron
DESCRIPTION
GPS Operations CGSIC Brief 15 September 08 Lt Joe Riedesel 2d Space Operations Squadron This briefing is UNCLASSIFIED. Overview. Navigation and Timing Performance Navigation Performance Time Transfer Performance Constellation Status. UTC TIME TRANSFER Specification 28ns. - PowerPoint PPT PresentationTRANSCRIPT
GPS OperationsCGSIC Brief
15 September 08
Lt Joe Riedesel2d Space Operations Squadron This briefing is UNCLASSIFIED
1UNCLASSIFIED
Overview
• Navigation and Timing Performance– Navigation Performance– Time Transfer Performance
• Constellation Status
2UNCLASSIFIED
-10-505
1015
117
127
137
147
157
167
177
187
197
207
217
NAN
OSE
CO
ND
S
JDAY
RMSAvg
UTC TIME TRANSFERSpecification 28ns
4UNCLASSIFIED
5
GPS Space and ControlClock and Reaction Wheel Performance Status
Wheelfunctionalwatch listdeadunused
2 3 41SVN (PRN)
2 3 41Clock*Wheel* II/IIA = Rb, Rb, Cs, Cs IIR = Rb, Rb, RbDiagonal Line = Unhealthy
launchdate Clock
meets specwatch list
deadunused
in use
Watch List
39A (09) 06/93
52M (31) 9/06
1
2
SLOT
3
4
5
PLANE A C D E F
38A (08) 11/97
56R (16) 1/03
33A (03) 03/96
59R (19) 03/04
46R (11) 10/99
51R (20) 05/00
40A (10) 07/96
43R (13) 07/97
36A (06) 03/94
41R (14) 11/00
44R (28) 07/00
48M (07) 03/08
35A (05) 08/93
37A (**) 05/93
34A (04) 10/93
54R (18) 01/01
32A (**) 11/92
26A (26) 07/92
45R (21) 03/03
6
47R (22) 12/03
30A (30) 9/96
B
60R (23) 06/04
61R (2) 10/99
53M (17) 09/05
25A (25) 02/92
24A (24) 07/91
58M (12) 11/06
23A (32) 11/90
55M (15) 10/07
57M (29) 12/07
27A (27) 09/92
19 (+0) SVs past design life 15 (+0) SVs past pre-launch mean life estimate (MLE) 18 (+0) SVs one component away from nav mission failure 8 (+0) SVs one component away from bus failure Anomaly Summary
• SVN 25 set unhealthy• SVN 35 set unhealthy
Constellation Status Summary
Changes Since Last Update
Total SVs in Category
6UNCLASSIFIED
7
IIA Vehicles On Last Clock
• SVN 36: has a higher likelihood of failing due to its Rb clock being turned on with over 8 years of on-orbit storage
• SVN-37: being stored as on-orbit spare in LADO• SVN-32: being stored as on-orbit spare in LADO
SVN Slot 1st Clock Last Clock
Storage time for current
clock (Years)
Clock operating time (Years)
Operational Clock
Clocks Remaining
Current Age of Vehicle (Years)
23 5-Dec-90 1-Jan-04 13.1 4.7 Rb #2 None 17.824 13-Jul-91 7-Sep-00 9.2 8.0 Cs #4 None 17.225 15-Mar-92 25-Dec-05 13.8 2.7 Rb #1 None 16.527 A4 24-Sep-92 20-May-05 12.7 3.3 Cs #4 None 16.030 B2 27-Sep-96 2-Jun-06 9.7 2.3 Cs #3 None 12.032 5-Dec-92 19-Aug-96 3.7 12.1 Cs #3 None 15.833 C2 3-Apr-96 1-Jan-07 10.8 1.7 Cs#4 None 12.435 21-Sep-93 8-Sep-05 12.0 3.0 Rb #1 None 15.036 18-Mar-94 19-Mar-04 10.0 4.5 Rb #1 None 14.537 20-May-93 21-Aug-07 14.3 1.1 Rb #2 None 15.340 E3 1-Aug-96 25-Mar-08 11.7 0.5 Cs #3 None 12.1
Bottom Line: 11 of 15 IIAs left are on their last clock
8
IIR/IIR(M) Clock Status No IIR/IIR(M) clock failures to date
SVN 43: First IIR launch, AFS 3 on for test purposes only
SVN 44:
AFS 1 had a baseplate heater failure Clock is assessed as viable Performance could be slightly degraded during eclipse season
SVN 61:AFS 3 clock failureSwitched to AFS 1
SVN Clock Status Date Active Total Years in Use
41 AFS 1 On 15-Nov-00 7.83AFS 1 On 13-Aug-97 11.09AFS 3 Off 7-Jul-98 0.87AFS 1 Off 10-Aug-00 0.06AFS 2 On 14-Aug-00 8.08
45 AFS 3 On 4-Apr-03 5.4446 AFS 1 On 21-Dec-99 8.7347 AFS 3 On 24-Dec-03 4.7248 AFS 3 On 19-Mar-08 0.4851 AFS 1 On 17-May-00 8.3352 AFS 3 On 29-Sep-06 1.9553 AFS 3 On 29-Sep-05 2.9554 AFS 1 On 7-Feb-01 7.6055 AFS 3 On 22-Oct-07 0.8956 AFS 3 On 6-Feb-03 5.6057 AFS 3 On 23-Dec-07 0.7258 AFS 3 On 21-Nov-06 1.8159 AFS 3 On 24-Mar-04 4.4760 AFS 2 On 28-Jun-04 4.21
AFS 1 On 27-Apr-08 0.38AFS 3 Off 10-Nov-04 3.47
ALL 89.68
43
44
61
9
A CB ED F
80
100
120
160
180
0
20
40
60
GLAN(deg)
A338
A139
B156
B344
D434
D246
E340
E454
F343
F141
D345
E151
E247
C359
F460
D161
35
A427
36
25 24
GPS Locations
C453
140
37
B230
A252
Watch List
Block IIABlock IIRBlock IIR-M
Block IIA reserve
58 B4
23
C233
C157
F25526
IIR-20(M)
48
32
SVN-27 Rephase Start Nov ’08 to b/u SVN-39 SVN-26 Rephase to F5 t/b Complete Apr ’09
Geographic Longitude of Ascending Node(GLAN)
0
100
120
AA CCBB EEDD FF
60
80
180
140
20
40
160F3 43
26
51
40
54
46
34
3530
56
44
39
25
38 27
F2
F1
F4
E1
E3
E4
E2
D2
D4
D1
D3
B4
A1 B2
B1
B3
A2
A4
A3
C1
C2C3
4547
60
6153C4
NOTE: Chart reflects status of bus & navigation payload only (not NDS payload status).
FMC
PMC
NMCInactiveManeuver
OPSCAP
3359
52
Block SVNs ( # )IIA 22-40 (14)IIR/IIR-M 41-61 (18)Current IIR-M’s (48, 52, 53, 55, 57, 58)
5823
24
4132
36
57
55
37
48