GPS Operations CGSIC Brief 21 September 09 Lt Daniel Boyd 2d Space Operations Squadron This briefing is UNCLASSIFIED 1 UNCLASSIFIED
Jan 09, 2016
GPS OperationsCGSIC Brief
21 September 09
Lt Daniel Boyd2d Space Operations Squadron This briefing is UNCLASSIFIED
1UNCLASSIFIED
Overview
• Navigation and Timing Performance– Navigation Performance– Time Transfer Performance
• Constellation Status
2UNCLASSIFIED
3UNCLASSIFIED
05/0
1/09
05/0
4/09
05/0
7/09
05/1
0/09
05/1
3/09
05/1
6/09
05/1
9/09
05/2
2/09
05/2
5/09
05/2
8/09
05/3
1/09
06/0
3/09
06/0
6/09
06/0
9/09
06/1
2/09
06/1
5/09
06/1
8/09
06/2
1/09
06/2
4/09
06/2
7/09
06/3
0/09
07/0
3/09
07/0
6/09
07/0
9/09
07/1
2/09
07/1
5/09
07/1
8/09
07/2
1/09
07/2
4/09
07/2
7/09
0.000
0.500
1.000
1.500
2.000
2.500
3.000
GPS Constellation RMS ERD Performance -- 01-May-09 through 28-July-09
Blk IIA Daily RMS Blk IIR Daily RMS Qtrly RMS All Qtrly RMS Blk IIA Qtrly RMS Blk IIR
Date
RM
S E
RD
(M
eter
s)
Report Period: 01-May-09 through 28-July-09 IIA Qtly RMS: 1.04 m IIR Qtly RMS: 0.50 m Const. Qtly RMS: 0.76 m
-10-505
1015
12
5
13
5
14
5
15
5
16
5
17
5
18
5
19
5
20
5
NA
NO
SE
CO
ND
S
JDAY
RMSAvg
UTC TIME TRANSFERSpecification 28ns
4UNCLASSIFIED
SV (PRN)Clock*Wheel
* II/IIA = Rb, Rb, Cs, Cs IIR = Rb, Rb, Rb
Meets Spec
Reduced Capability
Unusable for Ops
Unused
In Use
Clock/Wheel Key
Full Redundancy
Redundancy Lost
Reliability Unknown
Drifting within Plane
Bus/Nav Key
KEY
GPS Space Status – 03 Aug 2009Nav/Bus /Clock/Reaction Wheel Performance Status
A r r g G r g g r r g
g g g g g g g g g g g g g g g g g g g g g g g
LADO
B g g y g g y R R r r r g r
g g g g g g g g g g g g g g g g g g g g g g g
LADO
C g r r r g g g y r R y r g r r
g g g g g g g g g g g g g g g g g g g g g g g g
D g y g g g r r r g
g g g g g g g g g g g g g g g g y r g
E g g r r g r g r g r r
g g g g g g g g g g g g g g g g g g g g
LADO
F g g g g g g y r r g r
g g g g g g g g g g g g g g g g g g g g g g g g
47R (22) 12/03 40A (10) 07/96
57R (29) 12/07 33A (03) 03/96 59R (19) 03/04
61R (02) 11/04 46R (11) 10/99 45R (21) 04/03
55R (15) 10/07 43R (13) 07/97
27A (27) 09/92
Pla
ne
39A (09) 06/93 52R (31) 9/06
51R (20) 05/00
41R (14) 11/00
56R (16) 01/03 49R (01) 04/09
60R (23) 06/04 26A (26) 07/92 32A (XX) 11/92
54R (18) 01/01 23A (32) 11/90
37A (XX) 05/93
30A (30) 09/96
5 6
48R (07) 03/08
34A (04) 10/93 24A (24) 07/91
36A (06) 03/9453R (17) 09/05
Slot
58R (12) 11/06 35A (XX) 08/93
1 2 3 4
38A (08) 11/97 25A (25) 02/92
44R (28) 07/00
00R (00) 00/08
g
g g g g
Unhealthy
5
6
21 (+1) SVs past design life (including residual SVs) 18 (+0) Operational SVs past design life 15 (+0) SVs past pre-launch mean life estimate (MLE) (including residual SVs) 12 (+0) Operation SVs past pre-launch mean life estimate (MLE) 19 (+0) SVs one component away from Nav mission failure (including residual
SVs) 16 (+0) Operation SVs one component away from Nav mission failure 8 (+0) SVs one component away from bus failure (including residual SVs) 6 (+0) Operational SVs one component away from bus failure
Constellation Status Summary
Total SVs in Category
Changes Since Last Update
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-35: 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 5.7 Rb #2 None 18.824 13-Jul-91 7-Sep-00 9.2 9.0 Cs #4 None 18.225 15-Mar-92 25-Dec-05 13.8 3.7 Rb #1 None 17.527 A4 24-Sep-92 20-May-05 12.7 4.3 Cs #4 None 17.030 B2 27-Sep-96 2-Jun-06 9.7 3.3 Cs #3 None 13.032 5-Dec-92 19-Aug-96 3.7 13.1 Cs #3 None 16.833 C2 3-Apr-96 1-Jan-07 10.8 2.7 Cs#4 None 13.536 18-Mar-94 19-Mar-04 10.0 5.5 Rb #1 None 15.537 20-May-93 21-Aug-07 14.3 2.1 Rb #2 None 16.340 E3 1-Aug-96 25-Mar-08 11.7 1.5 Cs #3 None 13.1
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 failure Switched to AFS 1
SVN Clock Status Date Active Total Years in Use
41 AFS 1 On 15-Nov-00 8.84AFS 1 On 13-Aug-97 12.10AFS 3 Off 7-Jul-98 0.87AFS 1 Off 10-Aug-00 0.06AFS 2 On 14-Aug-00 9.09
45 AFS 3 On 4-Apr-03 6.4546 AFS 1 On 21-Dec-99 9.7447 AFS 3 On 24-Dec-03 5.7348 AFS 3 On 19-Mar-08 1.4949 AFS 2 On 28-Mar-09 0.4751 AFS 1 On 17-May-00 9.3452 AFS 3 On 29-Sep-06 2.9653 AFS 3 On 29-Sep-05 3.9654 AFS 1 On 7-Feb-01 8.6155 AFS 3 On 22-Oct-07 1.9056 AFS 3 On 6-Feb-03 6.6157 AFS 3 On 23-Dec-07 1.7358 AFS 3 On 21-Nov-06 2.8259 AFS 3 On 24-Mar-04 5.4860 AFS 2 On 28-Jun-04 5.22
AFS 1 On 27-Apr-08 1.39AFS 3 Off 10-Nov-04 3.47
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
27 36
2524
GPS Locations
C453
140
B6
30
A252
58 B423
C233
C157
F255
37
SVN-26 Rephase Complete: Sept ‘09
A448
32
IIF-1
49
Block IIA residual
Empty Slot
Watch List
Block IIA
Block IIR
Block IIR-MBlock IIR-M (L-5)
B5
B2
26
E650
Geographic Longitude of Ascending Node(GLAN)
0
100
120
A CB ED F
60
80
180
140
20
40
160F3 43
26
51
40
54
46
34
35
30
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
45
47
60
6153C4
NOTE: Chart reflects status of bus & navigation payload only (not NDS payload status).
FMC
PMC
NMC
Inactive
Maneuver
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