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Marc Walch Page 3 CNES’07 Peer Review 4/17/02 Both Ariane V launch environment. Grade 2+ parts. Other Mission Assurance Class B+ mission Grade 2+ parts 18 kRad total dose OS 20 cm diameter, 0.5 albedo, 30% return for Sun angle 3000 km range for search mode 2 km range for terminal phase mode Requirements
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CNES’07 Peer Review 4/17/02Marc Walch Page 1
Wide Angle Camera (WAC)And Narrow Angle Camera (NAC)
Marc Walch
April 17, 2002
CNES’07 Mars Premier Peer ReviewRendezvous and Sample Capture
CNES’07 Peer Review 4/17/02Marc Walch Page 2
NAC Build to print MRO OptNav Camera, use of spare MRO parts Detect OS at 3,000 km Relative motion requirement (OS in FOV) TBD Resolve OS down to 10 m (may be too bright?) Image update rate 20 seconds or less (data in S/C buffers within 20 seconds from
end of exposure) Variable/commandable exposure times
WAC Build to print or spare MER NAV Camera Detect OS at 2 km Relative motion requirement (OS in FOV) TBD Resolve OS to 2 m FOV at least 40 degrees (full cone angle - covers expected proximity ops OS to
camera relative motion) Image update rate 5 seconds or less (data in S/C buffers within 5 seconds from end
of exposure) Variable/commandable exposure times
Requirements
CNES’07 Peer Review 4/17/02Marc Walch Page 3
Both Ariane V launch environment. Grade 2+ parts.
Other Mission Assurance
Class B+ mission Grade 2+ parts 18 kRad total dose
OS 20 cm diameter, 0.5 albedo, 30% return for Sun angle 3000 km range for search mode 2 km range for terminal phase mode
Requirements
CNES’07 Peer Review 4/17/02Marc Walch Page 4
Mechanical Drawing
NAC Specifications
CNES’07 Peer Review 4/17/02Marc Walch Page 5
NAC SpecificationsPower Supply
(red box)
Regulators, S/C interface,
FPGA, ADC (green box)
Radiator
CNES’07 Peer Review 4/17/02Marc Walch Page 6
Performance Power 2.5 W Mass 2.5 kg (includes radiator and mount) FOV 1.4º Interface LVDS (Command & Data, each having 3 lines) Data transfer rate 1 MHz baseline, 3 full-frame buffer Resolution 1 pixel = 20 cm at 8,500 m
NAC Specifications
CNES’07 Peer Review 4/17/02Marc Walch Page 7
WAC Specifications Mechanical Drawing
CNES’07 Peer Review 4/17/02Marc Walch Page 8
Performance Power 2 W continuous, some peaks at 3 W (readout & flush) Mass 235 g FOV 45º Best focus 1 m Depth/field 0.5 m infinity Interface LVDS (Command –2 lines– and Data – 3 lines –) Data transfer rate 10 MHz baseline (1 full frame in ~5 s) In-spec T -55 C +22 C Survival T -120 C +70 C
WAC Specifications
