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GPS Operations CGSIC Brief 15 September 08 Lt Joe Riedesel 2d Space Operations Squadron

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.

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GPS Operations CGSIC Brief 15 September 08 Lt Joe Riedesel 2d Space Operations Squadron

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

  2. Overview • Navigation and Timing Performance • Navigation Performance • Time Transfer Performance • Constellation Status UNCLASSIFIED

  3. UNCLASSIFIED

  4. UTC TIME TRANSFERSpecification 28ns UNCLASSIFIED

  5. GPS Space and ControlClock and Reaction Wheel Performance Status Clock meets spec watch list dead unused in use Wheel functional watch list dead unused Watch List SVN (PRN) launch date 1 2 3 4 Clock* Wheel 1 2 3 4 * II/IIA = Rb, Rb, Cs, Cs IIR = Rb, Rb, Rb Diagonal Line = Unhealthy 53M (17)09/05 24A (24) 07/91 PLANE 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 52M (31)9/06 33A (03) 03/96 46R (11)10/99 30A(30) 9/96 47R(22)12/03 55M (15) 10/07 57M (29) 12/07 2 43R(13) 07/97 44R(28) 07/00 38A (08) 11/97 45R (21) 03/03 40A (10) 07/96 59R (19)03/04 3 34A (04) 10/93 27A (27) 09/92 54R (18) 01/01 60R (23) 06/04 58M (12)11/06 4 23A (32) 11/90 26A (26) 07/92 25A (25) 02/92 35A (05) 08/93 5 37A (**) 05/93 32A (**) 11/92 48M (07) 03/08 6 5

  6. Constellation Status Summary Total SVs in Category Changes Since Last Update • 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 UNCLASSIFIED

  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. Watch List 25 Block IIA reserve Block IIA Block IIR Block IIR-M GPS Locations 180 57 43 F3 C1 55 IIR-20(M) 160 37 58 B4 51 E1 35 140 30 36 A1 B2 39 46 D2 120 26 33 C2 C3 59 100 GLAN (deg) F2 B1 56 40 E3 80 34 D4 A2 52 60 61 D1 53 41 F1 C4 54 E4 32 40 44 B3 E2 24 47 20 48 45 D3 23 A4 27 60 0 A3 38 F4 A B C D E F SVN-27 Rephase Start Nov ’08 to b/u SVN-39 SVN-26 Rephase to F5 t/b Complete Apr ’09 9

  10. 160 100 OPSCAP 120 140 FMC PMC NMC Inactive Maneuver 60 40 BlockSVNs ( # ) IIA 22-40 (14) IIR/IIR-M 41-61 (18) Current IIR-M’s (48, 52, 53, 55, 57, 58) 20 180 0 F3 57 C1 Geographic Longitude of Ascending Node (GLAN) 23 43 B4 58 E1 37 51 35 A1 30 39 B2 36 D2 46 C2 33 26 C3 59 55 F2 E3 B1 40 56 80 A2 52 34 D4 NOTE: Chart reflects status of bus & navigation payload only (not NDS payload status). D1 F1 61 C4 E4 53 41 54 32 B3 E2 44 24 47 25 A4 D3 48 45 27 A3 38 F4 60 F B C D E A

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

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