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16 Scientific Instrument Technology of Lunar Lander
Table 16.7 (continued)
Instrument
Function
requirement
Performance
requirement
Implementation methods
in design and development
Signal to noise ratio
The photonic flow density
under different conditions
should be analyzed.
According to the detector
features, the optical system
should be analyzed to
achieve anticipated signal
to noise ratio
To adjust exposure
Solar incident angle range The automatic exposure
adjustment function
should be designed to
adapt different solar
incident angle
To compress image data
Image data compression
ratio
Wavelet algorithm was
applied to achieve better
image compression
To eliminate stray light
In design of optical
system, the optical field
should be set, which could
effectively suppress the
non-imaging beam
entering the system. The
outer cover was applied to
suppress the stray light
greatly, and the inner wall
was equipped with
multiple baffle rings. The
clutter light bar should be
set. All mechanical parts
should be able to eliminate
stray light. The inner wall
of the optical system was
black and had a dull thread
Morphology camera To acquire colorful image band range
It was achieved by spectral
of lens coating and
spectral of detector
Color
It was achieved by
selection of detector which
met the color requirement
To acquire continuous and
still image
Imaging modes:
continuous and still
The imaging mode could
be changed by
telecommand to select still
imaging or the continuous
imaging, or switch to each
other
(continued)