MARDI descent imaging and SSI color, stereoscopic and panoramic
imaging will provide geologic context and the digital elevation
models necessary for operating the RA.
begins operation after the aeroshell is jettisoned and acquires
20 descent images, providing geological context for the
area around the landing site.
consists of a set of nine-element refractive optics and
four surface-mounted, assembly-printed circuit boards connected
by flexible cables. The optics have an f-ratio of 5.6 and
a field of view of 65.9°. The detector is a Kodak KAI-1001:
1024×1024 (1018×1008 photoactive) with 9-µm
pixels, 20% fill factor, interline transfer, and electronic
shuttering. Exposure time is 4 ms. MARDI uses a Motorola
DSP 56166 operating at 60 MHz, with 4 kB of program RAM,
and 4 kB of data RAM. Data are digitized by a 12-bit analog-to-digital
converter (ADC), and square-root encoding to 8 bits using
1.8:1 lossless Huffman first difference compression. The
MARDI team will redo the MSP'01 calibration to verify functional
performance and will provide a new calibration report to
the Phoenix project in Phase C/D.