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9 OBDH Technology of Lunar Lander
9.3 Analysis of Technical Characteristics
9.3.1 Mission Analysis
The development trends showed that the electronic system played an increasingly
important role in spacecraft. More requirements for electronic system were come
up in the lunar lander. Beside the conventional telemetry, tracking, telecommand
and data management functions, the following requirements should be satisfied by
OBDH subsystem of the lunar lander.
(1) Payload management and data processing including the operation mode
management and data acquisition, storage, playback and image extraction
processing of various scientific exploration equipment. For example, there
were many operation modes and new technologies in the Chang’E-3 lunar
lander such as image extraction during powered descent, recording and playback synchronously in access time of ground station, payload dynamic/static
mode switch and etc., which brought up new requirements for payload data
management.
(2) More complex control and management functions for the platform computer
to implement unified control of the drive of all mechanisms, and more complex
autonomous thermal management functions including special thermal control
of the orbit control engine. For example, the OBDH of the Chang’E-3 lunar
lander should implement power supply and distribution management, pyro
device management, heating loop control, solar panel mechanism control,
biaxial mechanism control of directional antenna, control of lunar rover transfer
mechanism, control of camera pointing mechanism, control of –Y module
cover mechanism, and two-phase fluid loop valve drive, and etc.
(3) Constraints of volume, power consumption and mass. The system integration
method and advanced microelectronic technology should be applied to minimize the volume, power consumption and mass, so as to meet requirements of
the lunar lander.
(4) Application of international standards. The CCSDS and other standards should
be applied to design onboard electronic systems so that the downlink channels
and international space resources could be effectively utilized to realize data
transmission in space missions.From above all, the electronic system of the
lunar lander should be designed to be optimized and reconfigure resources.
Based on this, a space data system could be designed to satisfy requirements
of the lunar lander and the relative key technologies should be developed. It
was necessary to improve the capabilities of integrated electronic systems and
reduce mass, power consumption and volume, which was the key to successful
implementation of lunar soft-landing mission.
9 OBDH Technology of Lunar Lander
9.3 Analysis of Technical Characteristics
9.3.1 Mission Analysis
The development trends showed that the electronic system played an increasingly
important role in spacecraft. More requirements for electronic system were come
up in the lunar lander. Beside the conventional telemetry, tracking, telecommand
and data management functions, the following requirements should be satisfied by
OBDH subsystem of the lunar lander.
(1) Payload management and data processing including the operation mode
management and data acquisition, storage, playback and image extraction
processing of various scientific exploration equipment. For example, there
were many operation modes and new technologies in the Chang’E-3 lunar
lander such as image extraction during powered descent, recording and playback synchronously in access time of ground station, payload dynamic/static
mode switch and etc., which brought up new requirements for payload data
management.
(2) More complex control and management functions for the platform computer
to implement unified control of the drive of all mechanisms, and more complex
autonomous thermal management functions including special thermal control
of the orbit control engine. For example, the OBDH of the Chang’E-3 lunar
lander should implement power supply and distribution management, pyro
device management, heating loop control, solar panel mechanism control,
biaxial mechanism control of directional antenna, control of lunar rover transfer
mechanism, control of camera pointing mechanism, control of –Y module
cover mechanism, and two-phase fluid loop valve drive, and etc.
(3) Constraints of volume, power consumption and mass. The system integration
method and advanced microelectronic technology should be applied to minimize the volume, power consumption and mass, so as to meet requirements of
the lunar lander.
(4) Application of international standards. The CCSDS and other standards should
be applied to design onboard electronic systems so that the downlink channels
and international space resources could be effectively utilized to realize data
transmission in space missions.From above all, the electronic system of the
lunar lander should be designed to be optimized and reconfigure resources.
Based on this, a space data system could be designed to satisfy requirements
of the lunar lander and the relative key technologies should be developed. It
was necessary to improve the capabilities of integrated electronic systems and
reduce mass, power consumption and volume, which was the key to successful
implementation of lunar soft-landing mission.