The Goddard Mission Services Evolution Center (GMSEC) Message Bus is a robust, lightweight, fault-tolerant middleware implementation that supports all messaging capabilities of the GMSEC API. This architecture is a distributed software system that routes messages based on message subject names and knowledge of the locations in the network of the interested software components

Bristow, John O.

Butschky, Mike

Mayorga, Arturo

NASA Technical Reports Server

Software
Marsviewer 2008 
Marsviewer 2008 is designed for qual-
ity control, browsing, and operational
and science analysis of images and de-
rived image products returned by space-
craft. This program allows all derived
products (reduced data records, or
RDRs) associated with each original
image (experiment data record, or
EDR) to be viewed in various ways, in-
cluding in stereo, depending on the type
of image.
The program features a pluggable in-
terface called a “file finder.” This en -
capsulates knowledge of a specific mis-
sion’s filename and directory
conventions,  hiding the complexity be-
hind each mission from the user, and al-
lowing new missions to be added easily.
Within a mission, different directory
conventions can also be supported. This
file-finder interface presents a similar in-
terface to the user for all these missions
and directory structures. All EDRs found
for a given Sol are displayed in a list (op-
tionally with thumbnail images) for the
user to pick from.
Once an image is picked, a primary
(vertical) tab pane allows the user to se-
lect the left or right image, left or right
thumbnail, or stereo views. A secondary
(horizontal) tab pane allows the EDR, or
any of its RDRs, to be viewed. Most RDRs
may be viewed independently, or as col-
ored overlays on a background image.
Each of the 41 RDR types has a display
method appropriate for that type, and
most have display parameters that can
be adjusted.
The program understands two differ-
ent image geometries (raw and lin-
earized), and can show the actual pixel
values under the cursor for every EDR
and RDR matching the geometry type at
once. Various display manipulations,
such as zoom, data range, contrast en-
hancement, interval selection, and con-
tour controls are available. Metadata
(image labels) may be displayed and
searched as well. The stereo display
shows both left and right images simulta-
neously. It works either in anaglyph
mode (red/blue glasses), or by using
dedicated display hardware.
This innovation also covers the appli-
cations “jadeviewer” and “jade_over-
layer,” which are closely related deriva-
tives from Marsviewer. The “jadeviewer”
application reuses the image display and
visualization portions of Marsviewer
without the file finder. The user directly
specifies filenames and RDR type, and
can then view the product as with
Marsviewer.
This work was done by Nicholas T. Toole
and Robert G. Deen of Caltech for NASA’s Jet
Propulsion Laboratory. For more information,
contact iaoffice@jpl.nasa.gov. 
The software used in this innovation is
available for commercial licensing. Please con-
tact Daniel Broderick of the California Insti-
tute of Technology at danielb@caltech.edu.
Refer to NPO-46698.
Mission Services Evolution
Center Message Bus 
The Goddard Mission Services Evolu-
tion Center (GMSEC) Message Bus is a
robust, lightweight, fault-tolerant mid-
dleware implementation that supports
all messaging capabilities of the GMSEC
API, including publish/subscribe and
request/reply. The Message Bus enables
NASA to provide an open-source mid-
dleware solution, for no additional cost,
that is self-configuring, easy to install,
and can be used for the development of
GMSEC-compliant components. Some
professional capabilities provided by this
software include failover and fault toler-
ance, good performance, compression,
debugging, and wide platform support. 
This architecture is a distributed
software system that routes messages
based on message subject names and
knowledge of the locations in the net-
work of the interested software compo-
nents. Functional software components
register with the message bus, so that a
location directory can be maintained.
The functional applications then send
messages onto the bus with an indica-
tion of the message type/subject/etc.
Other applications that want to receive
data register with the message bus and
indicate what message types/subjects
they want to receive. The message bus
maintains a routing table where routes
publish messages to the applications
that have requested them. One mes-
sage may be delivered to many differ-
ent applications. Use of the message
bus eliminates the need for each appli-
cation to create separate communica-
tions paths with each application to
which it interfaces. 
The nature of the GMSEC Message Bus
enables any project or user to quickly
take the initial steps for creating or con-
necting GMSEC-compliant components,
and for developing small systems without
high license fees and learning curves.
This software uses middleware to facili-
tate cross application or component com-
munication on a software bus. 
This work was done by Arturo Mayorga and
John O. Bristow of Goddard Space Flight Cen-
ter and Mike Butschky of Interface and Control
Systems. Further information is contained in
a TSP (see page 1). GSC-15575-1
Major Constituents Analysis
for the Vehicle Cabin At-
mosphere Monitor
Vehicle Cabin Atmosphere Monitor
(VCAM) can provide a means for mon-
itoring the air within enclosed environ-
ments such as the International Space
Station, the Crew Exploration Vehicle
(CEV), a Lunar habitat, or another ve-
hicle traveling to Mars. Its miniature
pre-concentrator, gas chromatograph
(GC), and mass spectrometer can pro-
vide unbiased detection of a large num-
ber of organic species. VCAM’s software
can identify whether the chemicals are
on a targeted list of hazardous com-
pounds and their concentration. Its
performance and reliability on orbit,
along with the ground team’s assess-
ment of its raw data and analysis results,
will validate its technology for future
use and development.
The software processes a sum total
spectra (counts vs. mass channel) with
the intention of computing abundance
ratios for N2, O2, CO2, Ar2, and H2O. A
brute-force powerset expansion com-
pares a library of expected mass lines
with those found within the data. Least
squares error is combined with a penalty
term for using small peaks. This permits
calibration even in the presence of un-
expected/unknown system contamina-
tion or unknown/novel ratios of atmos-
pheric constituents.
Automated, reliable mass calibra-
tion is a substantial improvement be-
yond other comparable systems. A
method of compensation for variable
response component spectra has been
utilized via a weighted sum based on
the central peak for each expected
component.
NASA Tech Briefs,  January 2011 23
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Mission Services Evolution Center Message Bus

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