GPS Operations CGSIC Brief 15 September 08 Lt Joe Riedesel 2d Space Operations Squadron This briefing is UNCLASSIFIED 1UNCLASSIFIED.

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Presentation transcript:

GPS Operations CGSIC Brief 15 September 08 Lt Joe Riedesel 2d Space Operations Squadron This briefing is UNCLASSIFIED 1UNCLASSIFIED

Overview Navigation and Timing Performance – Navigation Performance – Time Transfer Performance Constellation Status 2UNCLASSIFIED

3

UTC TIME TRANSFER Specification 28ns 4UNCLASSIFIED

5 GPS Space and Control Clock and Reaction Wheel Performance Status Wheel functional watch list dead unused 2341 SVN (PRN) 2341 Clock* Wheel * II/IIA = Rb, Rb, Cs, Cs IIR = Rb, Rb, Rb Diagonal Line = Unhealthy launch date Clock meets spec watch list dead unused in use Watch List 39A (09) 06/93 52M (31) 9/ SLOTSLOT PLANE ACDEF 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/ R (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 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

9 ACBEDF GLAN (deg) A3 38 A1 39 B1 56 B3 44 D4 34 D2 46 E3 40 E4 54 F3 43 F1 41 D3 45 E1 51 E2 47 C3 59 F4 60 D A GPS Locations C B2 30 A2 52 Watch List Block IIA Block IIR Block IIR-M Block IIA reserve 58 B4 23 C2 33 C1 57 F IIR-20(M) 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) A CBED F F F2 F1 F4 E1 E3 E4 E2 D2 D4 D1 D3 B4 A1 B2 B1 B3 A2 A4 A3 C1 C2 C C4 NOTE: Chart reflects status of bus & navigation payload only (not NDS payload status). FMC PMC NMC Inactive Maneuver OPSCAP Block SVNs ( # ) IIA (14) IIR/IIR-M (18) Current IIR-M’s (48, 52, 53, 55, 57, 58)

Summary Navigation and Timing Performance – Navigation Performance – Time Transfer Performance Constellation Status Questions… 11UNCLASSIFIED