1. Author Name Page 1 CNES’07 Peer Review 4/17/02 CNES’07 Mars Premier Peer Review Rendezvous and Sample Capture OS Beacon Electronics And Power System Mark Schaefer April 17, 2002

2. Author Name Page 2 CNES’07 Peer Review 4/17/02  UHF Beacon that fits inside 20cm OS  24 cm is resonant at UHF  Serviceable  Compatibility with Electra  Compatible Channel  Modulation if any  Canister Open Loop Recording Mode or Carrier Tracking  Navigation requirements for Doppler measurements Requirements for tracking by CNES 07 only and for two Orbiters Beacon Frequency Stability Electra SSO or USO Stability  1000km range capability with Electra on CNES 07  Interval required with continuous contact Antenna Pattern related  Does not interfere with Netlander science  Mission Phasing  Frequency compatibility  Receiver Capture and Sensitivity degradation Requirements

3. Author Name Page 3 CNES’07 Peer Review 4/17/02  Battery powered (solar cells not compatible with OS optical properties)  Primary/Secondary  Charging requirements  Monitoring requirements  Temperature survival  Transmit disabled until OS is ejected  2 month maximum powered lifetime after OS ejection  Acceptable degradation over time  Survival life  9 month cruise  1 year in Mars orbit before ejection  Environmental Requirements  Launch/Ejection/Capture Vibration  NonOp and Operating Temperatures  EMC  Parts  Grade 2 Plus?  Radiation  Converting Industrial Use Beacon to Flight Qualified Requirements

4. Author Name Page 4 CNES’07 Peer Review 4/17/02  WAG Derived by Eric Arched based on previous experience with DS-2 and OS beacon electronics for RDF (Radio Direction Finder) concept  WAG reviewed (at WAG level) by Chad Edwards  Cost Estimate assumed Transceiver with Solar Cell Rechargeable Batteries using Patch Antennas for 2 to 3 year mission  Not applicable to present approach  Commercial Beacon upgraded for Flight could be  Order of Magnitude lower cost  Qualified at JPL JPL Internal Concept

5. Author Name Page 5 CNES’07 Peer Review 4/17/02  Commercial UHF beacons  ELTA Buoy Beacon (built Mars Balloon Relay for MGS)  SAW Oscillator  DS2 inheritance  Others  Antenna configuration  Patch or Multiple Patches  Spherical Dipole  Loop or Multiple Loops  Batteries: Primary/Secondary  Battery Charger vs. Battery Monitor  Lithium Thionyl Chlorate  Lithium Sulfur Dioxide  Lithium Manganese Dioxide  Lithium Carbon Monoflouride  Others Trades in Work

6. Author Name Page 6 CNES’07 Peer Review 4/17/02  Soft vs. Hard Surface and Structure  Issue for capture safety  Thermal Insulation  Surface material  Internal filler  Reflective Coatings  Compatible with albedo for camera  Maintains internal temperature  Compatible with Antenna  Compatible with Orbiter contact during capture  S/C or Internal Survival Heater  Maintains Battery and electronic components during Cruise  Beacon Transmit Duty Cycle  Power Consumption vs. probability of detection Trades in Work

7. Author Name Page 7 CNES’07 Peer Review 4/17/02  Define Mission Goals and Scenario  Define Mission/Hardware Requirements  Finalize trades on UHF beacon source, antenna configuration, batteries, structure  Develop concept design late May  Develop Cost, Workforce, and Schedule early June  Develop industry partners and JPL Team connections Path to Concept Review