Aerospace and Electronic Systems Magazine August 2016 - 19
Bhilawe et al.
the mission team for planning complicated, autonomous operations.
The linking feature also enables
the reuse of already uplinked commands by triggering them again and
again through EBCs, OBT, AOCE
autonomy events, etc.
For example, EBC triggering
macro TT commands are used for
Traveling Wave Tube Amplifier
(TWTA) autonomy. The EBC detects
the main TWTA failure and triggers
macro TT to reconfigure the transmission chain to use redundant TWTA.
Diagnostic Features
The processor status words reported in telemetry indicate the
telecommand system health. As
an interplanetary mission involves
significant delays in getting telemetry, it takes a lot of time to dump
the uplinked data to ground stations. Therefore, a checksum dump
feature is provided for getting the
checksum of all the database and
commands stored onboard.
Figure 10.
TC Autonomy functional diagram.
TESTING AND EVALUATION
Telemetry-telecommand (TMTC) package along with TC core
card and distribution card is shown in Figure 11.
Extensive unit level and system level testing [20], [21] was
carried out for the MTcP software. The unit level and system level
testing was carried out to verify the following:
C
Hardware software interface
C
Sorting algorithm for OBT
C
Priority of execution
C
TM auto-changeover
C
MTcP auto-changeover
In addition to the above testing, code walk through, design, and
database verification was done. All the mission plans were tested
in the setup shown in Figure 12 before actually sending them to the
spacecraft. The setup consists of AOCE and TC packages equipped
Uplinked command buffer update
Uplinked command counter update
Snap and Safe Mode Operation
Pulse/level/data commands
C
Command decoding of all types of commands
Decoding of proper sequence of uplinked commands
Handling of improper sequence of uplinked commands
Boundary checks
C
C
C
Command validation logics
Checksum of data/command and actual data/command verification stored onboard
Execution of commands
TC History to BDH
AUGUST 2016
Figure 11.
TMTC package in MOM.
IEEE A&E SYSTEMS MAGAZINE
19
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