MOST Status J-F FRONTON / CNES Venice March 2009 LSWT#

2 LSWT, Venice 29 Mach-01April 2009 MOST Status  MOST Version:  MOST new functionalities  MOST on going development  MOST evolutions  MOST use

3 LSWT, Venice 29 Mach-01April 2009 MOST Status  MOST Version:  Installed in February 2009  Version validated  The version include simulation of energy generation and consumption  MOST new functionalities  Improved energy simulation (3 sources with # models)  Primary & secondary batteries simulation  Solar panel simulations: different files depending on distance to Sun, Lander site and attitude  DC/DC converters simulation  Activity scheduling with energy profile optimization

4 LSWT, Venice 29 Mach-01April 2009 MOST  MOST new functionalities  Improved energy simulation  DC/DC converter average efficiency defined for HPC & LPC and line by line (ex: 60%)  Primary & Secondary batteries with “efficiency” calculated in relation to current, temperature (fixed value)  Solar panel used alone or in parallel to battery (secondary) 2W 3.3 W 4.5 W

5 LSWT, Venice 29 Mach-01April 2009 MOST Status / on-going work  MOST New development  Simulation of CDMS main lines  Differentiation between Instruments & Sub-systems  Under development with delivery in October 2009  CMDS evolutions  Differentiation between Instruments & Sub-systems  CDMS activity simulation / data transfer management  Data transfer simulation (rules, rates, MM allocation)  MOST define the adapted data transfer strategy: - Out of visibility: transfer from IM to MM - Visibility Orbiter / Lander: - if data in MM then IM to MM - MM empty then IM to Orbiter

6 LSWT, Venice 29 Mach-01April 2009 MOST Status / on-going work  CMDS Data rates  CDMS status  Number of instruments ON  Instrument priority  Transfer rate to MM or Orbiter  Transfer rate to MM simultaneous to MM to orbiter transfer  Period of application of this context  Data transfer interruption during backup of MM RAM in EEPROM

7 LSWT, Venice 29 Mach-01April 2009 MOST Status / on-going work  Mass Memory management  MM size dedicated to each instrument  Or no MM allocation to instrument  Period of application of this context  Different MM / data rate context can be used sequentially during an activity simulation (ex: SDL)

8 LSWT, Venice 29 Mach-01April 2009 MOST Status / on-going work  Transfer from Instrument to MM or Orbiter  Data destination no more predefined at instrument level but defined by MOST in view of : - Orbiter /Lander visibility - Status of MM  If allocated MM space filed up authorizing lost or no lost of data from IM  2 Strategies of data transfer: all data available in IM or finite amount of data

9 LSWT, Venice 29 Mach-01April 2009 MOST Status / Studies  Expected future development  Thermal simulation necessary for better energy simulation: - critical as batteries “efficiency” depends of temperature - batteries max temperature not to be exceeded - definition of batteries initial temperature (SDL)  DC/DC converters simulation (electrical & thermal model)