CNES’07 Mars Premier Peer Review
Rendezvous and Sample Capture
Wide Angle Camera (WAC)
And Narrow Angle Camera (NAC)
Marc Walch
April 17, 2002
Marc Walch
CNES’07 Peer Review 4/17/02
Page 1
Requirements
 NAC
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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
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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
Marc Walch
CNES’07 Peer Review 4/17/02
Page 2
Requirements
 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
Marc Walch
CNES’07 Peer Review 4/17/02
Page 3
NAC Specifications
 Mechanical Drawing
Marc Walch
CNES’07 Peer Review 4/17/02
Page 4
NAC Specifications
Power Supply
(red box)
Regulators,
S/C interface,
FPGA, ADC
(green box)
Marc Walch
Radiator
CNES’07 Peer Review 4/17/02
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NAC Specifications
 Performance
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Marc Walch
Power
Mass
FOV
Interface
Data transfer rate
Resolution
2.5 W
2.5 kg (includes radiator and mount)
1.4º
LVDS (Command & Data, each having 3 lines)
1 MHz baseline, 3 full-frame buffer
1 pixel = 20 cm at 8,500 m
CNES’07 Peer Review 4/17/02
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WAC Specifications
 Mechanical Drawing
Marc Walch
CNES’07 Peer Review 4/17/02
Page 7
WAC Specifications
 Performance
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Marc Walch
Power
Mass
FOV
Best focus
Depth/field
Interface
Data transfer rate
In-spec T
Survival T
2 W continuous, some peaks at 3 W (readout & flush)
235 g
45º
1m
0.5 m  infinity
LVDS (Command –2 lines– and Data – 3 lines –)
10 MHz baseline (1 full frame in ~5 s)
-55 C  +22 C
-120 C  +70 C
CNES’07 Peer Review 4/17/02
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