Aerospace and Electronic Systems - March 2019 - 10

The Adaptive Avionics Platform

Figure 3.
Adaptive Avionics Platform's partitioning and communication architecture [9], [10].

Each C-APP and P-APP partition comprises the executable code of the application in tasks and five common
services. Communication management breaks down into
message management (MESMA-IN and MESMA-OUT)
and signal management (SIGMA-IN and SIGMA-OUT).
In addition, there is the application management
(APPMA).
MESMA-IN receives all raw messages from the inrouter partition received after the previous invocation.
It checks for missing messages or message corruption.
SIGMA-IN extracts signals from the messages. It
is able to receive the same signal from several
sources and can carry out cross checks and
voting. For multisource messages, SIGMA-IN
provides a quality-of-service (QoS) indicator
for each signal, i.e., all sources available or nout-of-m sources lost.
APPMA manages the user application execution. It
receives commands from the supervisor partition to
switch operation modes, such as NOP and test
(TEST). Only one mode can be active at a time.
APPMA forwards incoming signals to the active
tasks. Moreover, APPMA might passivate user tasks
based on commands from the PLAMA supervisor
partition. After application execution, APPMA
checks for application errors and out-going signal
errors and reports those to the supervisor.
SIGMA-OUT packs application and APPMA
signals in messages.
10

MESMA-OUT forwards all user messages of one
cycle to the out-router partition.
Task: Applications can implement logics for different operation modes. A task can be active in multiple operation modes and multiple user tasks can be
active in a single operation mode. They do not have
to contain knowledge on redundancy, operation
mode, and mission mode managements. These are
controlled via APPMA.
All PLAMA services communicate on private channels with the PLAMA supervisor partition. The supervisor collects failure indications from all PLAMA
services. Based on this information, the PLAMA partition can enforce passivation or operation mode changes
of the application.

ADDRESSLESS COMMUNICATION
The physical communication on the backbone bus is
abstracted by a topic-based communication. User applications either provide topics (publish) or require topics
(subscribe). A topic comprises a unique identifier as well as
a description of the signals included. Topic-based communication is an instance of a publisher-subscriber paradigm.
Matching publishers and subscribers are, however, not
identified dynamically. Instead, during the organizational
phase all applications notify the CORG about their topics.
Based on the detected topology, the routes for the topics to
all subscribers are calculated and implemented statically.

IEEE A&E SYSTEMS MAGAZINE

MARCH 2019

Aerospace and Electronic Systems - March 2019

Table of Contents for the Digital Edition of Aerospace and Electronic Systems - March 2019

Contents
Aerospace and Electronic Systems - March 2019 - Cover1
Aerospace and Electronic Systems - March 2019 - Cover2
Aerospace and Electronic Systems - March 2019 - Contents
Aerospace and Electronic Systems - March 2019 - 2
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Aerospace and Electronic Systems - March 2019 - Cover3
Aerospace and Electronic Systems - March 2019 - Cover4
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