科研之友
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摘要
The Altair lunar lander navigation system is driven by a set of requirements that specify a need to land within 100 m of a designated spot on the moon and to be capable of a safe return to an orbiting Orion capsule in the event of loss of Earth ground support. These requirements lead to a design for a capable onboard navigation system that works in conjunction with an Earth ground navigation system. The resulting system relies on combining a multiplicity of data types including navigation updates from the ground, passive optical imaging from a gimbaled camera, a stable inertial measurement unit, and a capable radar altimeter and velocimeter. It is shown that such a system is capable of a safe delivery to the moon and then a subsequent landing that meets the 100 in requirement. Furthermore, parametric trades on system components (i.e., onboard instruments not working, loss of the Earth ground system, etc.) demonstrate that the system is robust in the presence of failures and able to maintain sufficient knowledge of the trajectory for safe operations.
- 出版日期2012-4
