Environmental Engineering Reference
In-Depth Information
B
Operational Scenarios and Agent Interactions
To show more fully how the Remote Agent implementation introduced in
Chap.
6
would work in an actual on-orbit situation in the uncrewed science-
mission context, this chapter provides a series of operational scenarios that
illustrate the interaction of agents among themselves onboard, the interac-
tion of flight-based agents with ground-based agents, and the interaction of
members of a spacecraft constellation with each other.
B.1 Onboard Remote Agent Interaction Scenario
To illustrate the behavior of flight system Remote Agents (incorporating the
full FSW subsystems and functionality discussed previously) cooperating to
achieve a mission objective, consider the operational scenario defined by the
following somewhat simplified assumptions:
1.
The mission type is a Lagrangian-L2 celestial pointer.
2.
The primary mission goal is to observe all ground-specified targets while
minimizing fuel expenditure so as to maximize mission lifetime.
(a)
The ground will group observations in clusters
(b)
The ground defines the nominal order in which the observations within
a cluster are performed
(c)
The FSW defines the cluster order, subject to the following restrictions:
(i)
If not prohibited by another restriction, on completion of all ob-
servations within a cluster, transition to the cluster whose first ob-
servation is closest to the final spacecraft attitude on completion
of observations within the current cluster.
(ii)
If the new cluster's observations cannot be completed before an
angular-momentum dump is required, select the nearest cluster
that can be completed, subject to the momentum restriction.
