VAP Spacecraft and Programmatic Status - Mission Update
This update provides detailed information on the current status and predictions for the Van Allen Probes mission, including propellant usage, radiation tolerances, power output, and remaining mission capabilities. Anomalies like spacecraft resets are also discussed.
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VAP Spacecraft and Programmatic Status Van Allen Probes Ed Reynolds 240-228-5101 Ed.reynolds@jhuapl.edu
Mission Lifetime Propellant is predicted to last until November 2018 with existing trajectory Radiation summary: All parts in radios are tested or verified tolerant to >20 krad and the radio is shielded with 750 mils which supports mission life of Nov 2018 All parts on instruments and in other spacecraft assemblies are tested or verified to be tolerant to >30 krad which supports mission life of November 2018 with margin Near surface materials have been tested to 10 Mrad which supports a mission life beyond November 2018 with RDM=3 design margin EMXO aging is not a life limiting factor SSP RF Power output is predicted to exceed RF required output power levels beyond 2025 with 2 dB link margin Solar array power degradation due to radiation and power for the Observatory will be available until beyond November 2018 Battery will be able to support eclipses of expected nominal durations beyond 2018
Remaining Usable Propellant Propellant usage based on initial usable propellant = 55.93 kg. Usable propellant depicted. For total including residuals, increase by 0.565 kg. As of August 31, 2014: SCA usable = 43.97 0.72 kg. SCB usable = 43.83 0.72 kg. Van Allen Probes Remaining Usable Propellant 57 56 SCA Remaining Propellant [kg] 55 Remaining Usable Propellant [kg] SCB Remaining Propellant [kg] 54 53 52 SCA (kg) SCB (kg) 51 50 Total propellants used as of 8/31/14 13.5 13.5 49 48 47 Reserved for Disposal 19 19 46 Available for extended missions 23.5 23.5 45 44 43 42 2012.08.29 2013.01.01 2013.05.06 2013.09.08 2014.01.11 2014.05.16 2014.09.18 2015.01.21 SC Time [UTC]
Data Return Summary Trend Plot Data Return Weekly/Daily Average 16 BARREL Balloon Campaign Data Compression Enabled 14 SSR Allocations changed 12 10 Gbits 8 Level 0 production Issue in GSW SCA SCB 6 Required Daily Avg. Looking ahead to extended mission, SOCs encouraged to record more 4 2 0 11/7/12 12/7/12 10/7/13 11/7/13 12/7/13 1/7/13 2/7/13 3/7/13 4/7/13 5/7/13 6/7/13 7/7/13 8/7/13 9/7/13 1/7/14 2/7/14 3/7/14 4/7/14 5/7/14 6/7/14 7/7/14 8/7/14 9/7/14
Anomalies Spacecraft Resets XCVR reset occurred on RBSP-A at 255-03:32:30z Telemetry indicated a Power On Reset No indication from PDU or Autonomy that off-pulse was sent Current telemetry shows no change in power Radio behavior looks consistent with firmware reset, except reset source reported back as off-pulse C&DH reset occurred on RBSP-B at 259-19:05:04z Processor reset indicated illegal instruction program exception . Generated during Memory Transfer Task (MSFR) Under investigation. Recreating memory structures and stepping thru execution. Looks like radiation induced. Seeking data from instruments. Local EMI interference at APL station Lost commanding ability for a pass Interference high during significant Federal events in Washington Problems binding with remote stations (Australia) Wrong script used Data gaps, redundancies, and wrong sized files Tied to L3 ground software updates and patches Focus now on stability, and not to keep the most current version
Bridge Phase Programmatics APL Contract: Updated Statement of Work Received from Program Office Replaces Closeout Data Archiving with a 3rd year of operations within LWS Contract Defers Closeout Data Archiving Phase to a future contract Project is to work within its current contract value using the year three budget, project underrun, and unused reserves Contract modification that does not increase period of performance or contract value relatively straight forward. Science Investigation subcontracts will be modified to increase their contract values, based on values that are in their Bridge Phase proposals. Science Investigation proposals were for an 11-month period An additional month of budget was calculated based on the SI bridge proposals APL Subcontracts group working to modify their current contract to continue operations and science analysis and to not perform closeout data archiving, which will be contracted sometime in the future under a new subcontract. After this third year of operations, APL will be funded under a new contract vehicle with different terms and conditions which will be flowed to SI. Bridge Phase funding is separate from Augmentation funding
Contracting authority moved from NMO West to NMO East Valeria Thomas is now the contracting officer Van Allen Probes Trending Review Dec 3, 2013 1.6- 7
