DS1 Remote Agent Experiment
Deep Space One
(DS1) is the first spacecraft to be launched as a part of NASA's
New Millenium Program. DS1 will being flying by and photographing
an asteroid and a comet, but it is, for the most part, a technology
validation mission. As a result of its stellar perfomance on the NewMaap
Simulation, Remote Agent was chosen as one of the new technologies
to be tested on this mission. The test is called the Remote Agent
Abilites Remote Agent Will Demonstrate During RAX
- Planner/Scheduler (PS) will generate plans to achieve general mission goals.
Smart Executive (EXEC) will effectively execute the plans by sending commands to
Mode Indentification and Recovery (MIR) will detect and isolate failures and
initiate recovery actions when necessary.
PS will generate new effective plans if necessary after failure detection, based on
the new status of the spacecraft.
RAX consists of two separate stages, Phase One and
Phase Two. Phase One will last two days, and Phase Two will last
Phase One Tasks
PS will generate two plans, each lasting approximately one day
sequences to achieve mission goals such as imaging for optical
navigation and Solar Electric Propulsion thrusting in order to
stay on course.
EXEC will command spacecraft components to carry out the plan
MIR will monitor the actions of the spacecraft components and
will detect an injected failure, the camera is stuck on.
EXEC will abort the plan and request the PS to generate a new
plan based on the current status of the spacecraft.
MIR will detect and isolate a second injected failure, failure
of a hardware device, and will recover by suggesting that EXEC
reset the device.
MIR will detect a third injected failure, a thruster stuck closed,
and will recover by suggesting that EXEC use an alternative method
of attitude control.
Phase Two Tasks
Ground controllers will send DS1 a plan to go into standby mode
and then to take a series of optical navigation images. EXEC will
carry out the plans by sending commands to the appropriate spacecraft
MIR will detect a failure, a power bus switch unexpectedly off,
which was injected into the software by ground controllers.
MIR will diagnose the failure as the sensor giving an inaccurate
reading and therefore no recovery action will take place. EXEC
will continue with the current plan.
If Remote Agent successfully performs the tasks in RAX,
it will pave the way for this new technology to control future
missions; missions that would otherwise be impossible.