Aerospace and Electronic Systems - March 2019 - 9

Annighoefer et al.

Figure 2.
Overview on the elements and features of the Adaptive Avionics Platform concept.

ADAPTIVE AVIONICS PLATFORM CONCEPT
The AAP is a construction kit for self-configuring
avionics systems. This section details the components
of this construction kit, which are namely the hardware
platform, a middleware-based software architecture,
an address-less communication, the self-configuration
mechanism, and fault-tolerance mechanisms. An overview on all AAP elements is depicted in Figure 2.

HARDWARE PLATFORM
An instance of the AAP is built of three types of components: Computing modules (CPM), I/O modules (IOM),
and switches (SWI) of a backbone network as well as a
central configuration computer (CORG).
CPMs provide computing resources and memory for
system applications. They can occur as single-lane
modules or duplex modules. CPMs host multiple
system applications.
IOMs are the gateways between the peripheral components and the backbone bus. The number and
type of peripheral interfaces might differ between
different IOM types. The number of IOMs scales
with the number of necessary peripherals.
The SWI is the central component of the backbone
bus. All connections within the backbone bus are
actively switched point-to-point connections. CPMs
and IOMs must be connected to a SWI. A SWI can
be connected to another SWI.
MARCH 2019

The CORG is the self-configuration supervisor.
It has services for topology discovery, hosts the
application repository, and manages self-verification. The CORG is removed from the AAP instance
after self-configuration.

MIDDLEWARE-BASED SOFTWARE ARCHITECTURE
The developer of system applications for the AAP shall
not be responsible for configuration, communication, and
failure management. Therefore, the AAP comprises the
software architecture depicted in Figure 3.
The CPM and IOM are equipped with a real-time
operation system (OS) that abstracts hardware communication and provides partitioning of applications. C-APPs
are computing applications and P-APPs comprise peripheral communication. C-APPs are restricted to CPMs and
P-APPs are restricted to IOMs.
On each module, there are three default partitions.
1) The organization partition is inactive during the
standard phase, but mandatory during organization. It
provides unique address broadcasting, initial communication services, neighborhood discovery, peripheral
discovery, a local topology memory, and an application
launch service. 2) There are generic router partitions
on CPMs and IOMs, which manage the message
handling between the backbone network and the applications. 3) The platform management (PLAMA) supervisor partition monitors the application. PLAMA
abstracts the failure management and mode management [29].

IEEE A&E SYSTEMS MAGAZINE

9

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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