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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
To compress image data
Maximum data rate
The maximum data rate
requirements should be
satisfied by reasonable
selection of pixel number,
image compression ratio
and frame frequency
Image data compression
ratio
Wavelet algorithm was
applied to achieve better
image compression
EUV camera
To acquire EUV image
Band range
It was achieved by EUV
band multilayer coating
reflector, UV band filter,
UV band photon counting
imaging detector together
FoV
Resolution
It was achieved by design
of camera aperture, FoV
and equivalent pixel
number together
Sensitivity
It was achieved by
determination of
parameters such as into
pupil area, resolution,
reflectivity of the reflector,
transmittance of the filter
and quantum efficiency of
the detector
To point to Earth
Adjustment of azimuth
and pitch
After the landing site
position, landing attitude
and Earth-Moon relation
were analyzed, the
adjustment range of
azimuth and pitch of
two-dimensional
mechanism was
determined
LUT
To observe celestial body
of brightness higher than
specific value in near
ultraviolet wavelength
Band range
It was achieved by near
ultraviolet film and near
ultraviolet CCD
Observation limitation,
Observation uncertainty,
FoV
It was achieved by design
of telescope aperture, focal
length, transmittance of
the films, elimination of
stray light, high-efficiency
detector, low-noise and
low-dark-current
electronics together
(continued)