This paper discusses the development of a reconfigurable computing platform for rapid prototyping of avionics sensor systems. It emphasizes the integration of various PMC modules on a COTS SBC, enabling flexible and scalable testing environments for different sensor applications. The proposed system aims to streamline project development and enhance operational effectiveness by allowing quick adaptation to evolving mission requirements.

1. Avionics sensor simulation and prototype design workstation
using COTS reconfigurable computing technology
James Falasco, GE Fanuc Embedded Systems
1240 Campbell Road
Richardson, Texas 75081
Abstract
This paper reviews hardware and software solutions that allow for rapid
prototyping of new or modified embedded avionics sensor designs, mission
payloads and functional sub assemblies. We define reconfigurable
computing in the context of being able to place various PMC modules
depending upon mission scenarios onto a base SBC (Single Board
Computer). This SBC could be either a distributed or shared memory archi-
tecture concept and have either two or four PPC7447 A/7448 processor
clusters. In certain scenarios, various combinations of boards could be
combined in order to provide a heterogeneous computing environment.
Keywords: Sensor simulation, reconfigurable computing, video compres-
sion, video, reflective memory, payload integration, sensor fusion, high
speed data acquisition, video surveillance
1. Introduction
The design of avionics sensors and mission payloads can be a complex and
time-consuming process. However, the design cycle can be significantly
shortened if the system designer has access to a flexible, reconfigurable
development environment that closely mimics the capabilities and tech-
nologies of the deployed system.
By integrating various PMC modules with a scalable, reconfigurable multi-
processor architecture, it is possible to create a development tool that will
allow the system designer to rather quickly and accurately simulate and
test with real data sets the various sensor designs and mission compo-
nents to be fielded.
Specifically, we present a rapid prototyping and rapid evaluation system
that will simplify the establishment of performance requirements, and allow
the quick evaluation of hardware and software components being
considered for inclusion in a new sensor system design or a legacy
platform upgrade.
2. An Open Systems, COTS Platform
The system hardware and software used to evaluate sensor designs and
mission payload components and algorithms should be open and recon-
figurable to allow for the mixing and matching of various vendor offerings.
Provision for hardware independence is critical, since the hardware is very
likely to rapidly evolve at the pace of new computer technology. The
software infrastructure should be scalable and flexible allowing the algo-
rithm developers the ability to spend their time and budget addressing the
important functionality and usability aspects of the systems design. The
system proposed here, a test and evaluation workstation built around
reconfigurable hardware and a component-based software toolset,
provides the necessary tools to ensure the success and cost effectiveness
of initial sensor design and payload development.
At the center of any scalable prototyping system is a reconfigurable multi-
processing CPU engine with associated memory. The system depicted in
Fig. 1 provides developers a scalable environment for application design
and test. A COTS single board computer (SBC) tightly integrated to a PMC
FPGA card for design experimentation forms the core system. Other PMC
modules can then be selected depending on the type of sensor input that
needs to be processed.
One of the main advantages of this approach is the ability to rapidly proto-
type mockups for test and evaluation without a concern for the limitations
of embedded development at this early stage. The COTS SBC shown has the
ability to host two PMC modules per card. The Video card can efficiently
manage real sensor input coming in from an E/O sensor/camera, and also
display that data in a fused fashion. This approach allows the system
builder to work in the lab and the field using the same hardware/software
environment. This system configuration also provides the developer with a
test bed to define/design new hardware requirements and processing
streams.
3. Prototyping System Structure
Modern embedded avionics sensor design is primarily driven by the goal of
providing a net-centric flow of data from platform to platform. The achieve-
ment of this vision depends on transferring and processing vast amounts of
data from multiple sources. Let’s examine how one could use this approach
to control and manage various sensors in a rapid prototyping environment.
As depicted in Figure 1, the host server for the embedded avionics sensor
design workstation is a COTS Dual 7447A PowerPC VMEbus SBC. The board’s
architecture provides a distributed processing environment that allows
scaling of multiple processing nodes to achieve high performance for the
most demanding signal and imaging applications associated with various
sensor and mission payload design requirements.
Fig. 1. FPGA vision and graphics platform
The COTS SBC architecture combined with the FPGA/Video cards allows for
seamless mapping of imaging applications oriented toward change detec-
tion and sensor fusion which will allow the systems designer to view
multiple data streams in a simulations real time display environment.
The SBC implements processing nodes using the latest Motorola
7447A/7448 PowerPC® processors running at up to a 1.4 GHz clock rate.
Using the distributed processing architecture of the SBC, one bridge chip
per node allows the Front Side Bus (FSB) of each PowerPC to run in MPX
mode up to its maximum rate of 133 MHz. The high performance data
transfer mechanism facilitated by the built-in 64-bit full duplex crossbar in
the Discovery II bridge permits concurrent data transfers between different
interfaces as well as transaction pipelining for same source and
destination transactions.
The prototyping architecture outlined here is based on a combination of
tightly integrated reconfigurable computing, video and graphics. It will
place the embedded avionics sensor design community in position to utilize
the proposed system architecture in development of the actual controller
for payload packages as well as the sensor itself and in its actual deploy-
ment integration. Most importantly it will allow for cost-effectively
maintaining and extending the system when new technologies are avail-
able in the future.
3.1 An Example: Infrared (IR) scene projection
Increased sensor performance and bandwidth has begun to overwhelm
existing backend processing capability. Current test and evaluation
methods are not adequate for fully assessing the operational performance
of imaging infrared sensors while they are installed on the weapon system
platform. However, the use of infrared (IR) scene projection in test and
evaluation can augment and redefine test methodologies currently being
used to test and evaluate forward looking infrared (FLIR) and imaging
IR sensors.
One could project accurate, dynamic and realistic IR imagery into the
entrance aperture of the sensor, such that the sensor would perceive and
respond to the imagery as it would to the real-world scenario. This
approach includes development, analysis, integration, exploitation, training,
and test and evaluation of ground and aviation based imaging IR
sensors/subsystems/systems. This applies to FLIR systems, imaging IR
missile seekers/guidance sections, as well as non-imaging thermal sensors.
The systems approach proposed in this paper has the scalability to accom-
plish this type of reconfigurable sensor mix and match. Algorithms such as
the one depicted in Figure 2 could be transformed into a Mathlab®
Simulink® Blockset for easy execution in a reconfigurable system utilizing
FPGA- and PPC-based computing elements. Embedded avionics
HWIL Simulation demands include low latency, high data rates and
interfacing. It is essential to have a capable platform for handling and
processing of the data streams. Tools must also complement this so that a
systems designer is able to construct the final system leveraging design
tools, such as Mathlab and Simulink, with a reconfigurable
computing platform.
Fig. 2. Example: sensor images
This approach allows one to demonstrate how algorithms can be imple-
mented and simulated in a familiar rapid application development
environment before they are automatically transposed for downloading
directly to the distributed multiprocessing computing platform. This
complements the established control tools, which usually handle the
configuration and control of the processing systems leading to a tool suite
for system development and implementation.
3.2 The advantages of FPGA Computing
As the development tools have evolved, the core-processing platform has
also been enhanced. These improved platforms are based on dynamically
reconfigurable computing, utilizing FPGA technologies and parallel
processing methods that more than double the performance and data
bandwidth capabilities. This offers support for processing of images in
Infrared Scene Projectors with 1024 X 1024 resolutions at 400 Hz frame
rates. Simulink Blocksets could add the programming involved to organize
algorithms that could then be partitioned to operate on a multiprocessor
based FPGA/PPC based configuration.
Another key component of reconfigurable scalable embedded avionics
sensor design and prototyping capability is access to FPGA based
processing. FPGA (Field Programmable Gate Array) is defined as an array of
logic blocks that can be ‘glued’ together (or configured) to produce higher
level functions in hardware. Based on SRAM technology, i.e., configurations
are defined on power up and when power is removed the configuration is
lost – until it is ‘reconfigured’ again. Since an FPGA is a hardware device, it is
faster than software.
The FPGA can best be described as a parallel device that makes it faster
than software. FPGAs as programmable “ASICs” can be configured for high
performance processing, excelling at continuous, high bandwidth applica-
tions. FPGAs can provide inputs from digital and analog sensors —LVDS,
Camerink, RS170 — with which the designer can interactively apply filters,
do processing ,compression, image reconstruction and encryption time of
applications. Examples of the flexibility of this approach using COTS PMC
Modules hosted by a COTS multiprocessing base platform are shown in
Figures 3 & 4.
Fig. 3. Example: FPGA application. PMC FPGA processor for capture and
compression. PMC module for graphics and display.
Fig. 4. RS-170/MPEG-4 video PMC. Integrated bundle of PMC, mezzanine and
MPEG-4.
3.3 The ‘Mix and Match’ Platform Advantage
Today’s soldier, who is the ultimate customer of the embedded systems
designer, is faced with a continuously fluid chain of world events. These
changing events are closely mapped into the deployment of various air, sea
and land platforms which contain the reconfigurable embedded systems
architecture under discussion in this paper. For example, based on
changing mission requirements, any of the following three different areas
might be needed by the soldier: sonar processing; SIGINT; or
video surveillance.
The system designer addressing these defined application areas could
place various PMC modules together in the prototyping system with relative
ease. Specifically, these applications might collectively require the following
list of PMC modules: PMC #1—Graphics; PMC#2—Video Compression;
PMC#3—Reflective Memory; PMC#4—1553; PMC#5—High Speed Data Acqui-
sition; PMC#6—Race++. A key cornerstone of the ‘mix and match’ strategy is
that while the PMC module may change from application to application, the
core SBC ‘multiprocessor’ engine and its associated software tool chain
remains constant. The same can be said for the VME enclosure that
contains the processing cards.
Let’s now examine the application areas and understand how we could
place various PMC combinations together to address the processing
requirements of each application.
3.4 Sonar Processing: PMC #1—Graphics, PMC #5
—High Speed Data Acquisition
In this example the PMC Graphics card would be utilized to display sonar
waterfall display data perhaps with an overlay of tactical positions. The
High Speed Data Acquisition PMC could be used to facilitate the information
coming in from a high speed sensor interface. The combination of the two
modules hosted by the multiprocessor-enabled SBC could move
from this application area to another type of sonar processing, triggered by
software or the base modules could be switched to those shown in the
SIGINT example below.
3.5 SIGINT: PMC #6—Race ++, PMC #3—Reflective memory
In a SIGINT application scenario a RACE ++ PMC module is tied to other
Race++ peripherals allowing for interfacing while the reflective memory
module stores real time acquired data that could be used for post
processing data analysis.
3.6 Video Surveillance: PMC #2—Video Compression, PMC #4—1553
In the video surveillance application area, the video compression PMC
module would pre-process and reduce the incoming data stream and pass
it to the multiprocessor base system for potential change detection
analysis. Then using the PMC 1553 module, one could communicate to an
external avionics platform to perhaps control or guide ordnance
being placed upon the target under surveillance.
In each of the three examples above, the modules are interchangeable
depending upon the specific mission. This approach would allow the soldier
to move module packages between platforms achieving different mission
scenarios through software loading while maintaining the core base multi-
processing and packaged environment.
4. Conclusions
The goal of integrating a COTS system such as the one depicted here is to
allow designers to use the same environment in the lab that they could
then take to the field for live data collection activity. This is of particular
value to a system engineer who could use such an environment to perform
new development activities. Because of these efficiencies, the
outlined prototyping system would pay off in accelerated product develop-
ment time.
Systems designers are traditionally faced with the challenge that today’s
sensors are generating data at a rate far faster than the backend end
systems are configured to process. Combine this fact with the reality that a
sensor fusion “paradigm” is now mandatory for designers wishing to turn
concepts into reality rapidly. A key component to a flexible hardware
system, of course, is a software structure that enables designers to go from
their ideas and algorithmic concepts to code or HDL.
Packaging of the system is largely dependent on the user’s requirements
for flexibility. Should the user desire a system that can be scaled up by
adding additional cards, then a larger slot chassis could be configured to
allow for the addition of other cards. The key point is that the core
hardware outlined not only has the potential for scalability by adding addi-
tional modules to the base processing units, but the entire system has
scalability as well.
PPC to
PCI-X Bridge
(64360)
PPC to
PCI-X Bridge
(64360)
1 GHz
7448 or
7447A
PowerPC
32 MB
User Flash
32 MB
User Flash
VME Bus
P1
Up to
320 MB/s
Peak
Up to
1064 MB/s
Peak
PMC 1
PMC 2
PCI-X
Bridge
PCI-X
Bridge
NVRAM NVRAM
256 MB DDR 256 MB DDR
64-bit/133 MHz
64-bit/133 MHz
Gigabit
Ethernet
Multifunction
Serial
Gigabit
Ethernet
Multifunction
Serial
Up to
1064 MB/s
Peak
64-bit/
133 MHz
64-bit/
133 MHz
2eSST
VME Bridge
1 GHz
7448 or
7447A
PowerPC
OPTICAL FILTER
FILTER WHEEL
INTENSIFIER
FOCAL BACKPLANE
INTENSIFIER
HIGH VOLTAGE
POWER SUPPLY
MICROCONTROLLER
ELECTRONICS
CCD IMAGING CHIP
AND VIDEO ELECTRONICS
Video Rate Camera
• 30 frames per second
• Average image size (after registration):
642 x 343 pixels (8 bit)
Spinning Filter Wheel
• Creates 6-band multispectral image
Representative Sensor
Graphics PMC Module
High Speed Data Acquisition PMC Module
Multiprocessor BSP
Graphics SW Layer (OpenGL)
Adding Applications Layer
Mix & Match Platform Advantage Example 1
Sonar Processing
SIGINT Reconfigurable System Environment
RF Receiver
Real-Time Capabilities
Real-time Signal Detection
Signal Tracking
Operator Event Marking
Signal Classification
Fusion of Data
Incoming Information Pre-Processed-
Processed & Post Processed and stored
for future analysis
Digital Capture of
Signal Data
Near-Real-Time Capabilities
Automatic Detection
Signal Localization
Display and Analyze Results
Operator in the Loop
Data Tapes
Processing & analysis may be performed on the ground at near-real-time
rates by transfer of information from platform to ground station.
Signal Analysis Function (SAF)
Mix & Match Platform Advantage Example 3
Video Surveillance
1553 PMC
Video Compression PMC
Multiprocessor BSP
Adding Applications Layer
Battle Damage Assessment
Electronic Surveillance
Cross-cueing Sensors
FOPEN Radar
Minefield Detection
LADAR
Data Link Compression
All Weather Target Acquisition
Sensor Fusion
Mission Planning
UAV Application Examples
Existing Platforms & New Designs Will Continue Flying For Decades
Incremental Mission Payload Responsibilities Will Be Added
Requirements For Interoperability Continue To Increase
Developers Will Need To Shrink Payload Processing System
Conclusions
Overcoming Data Compression Bottlenecks
Pentium enabled SBC’s
VMIC Product Line
PPC enabled SBC’s single,dual
& quad configurations
Richardson Product Line
Display Capability
CDI Product Line
Storage Capability
Camarillo Product Line
1553 Data link
Step 3
The process of the first two steps allows
the system developer to combine real
world data with simulated scenarios and
compare and contrast in order to hone
overall system design efficiency
Step 1
Data acquired in real time
Step 2
Data is passed to PMC module to be
processed & on Nexus Single Board
Computer for backend processing &
matching for decisions (mission driven
scenarios)
PMC Module
Collect & Process Data from
suspension subassembly
Data Acquisition Sensor
Solving The Bandwidth Problem
PPC to
PCI-X Bridge
(64360)
PPC to
PCI-X Bridge
(64360)
1 GHz
7448 or
7447A
PowerPC
32 MB
User Flash
32 MB
User Flash
VME Bus
P1
Up to
320 MB/s
Peak
Up to
1064 MB/s
Peak
PMC 1
PMC 2
PCI-X
Bridge
PCI-X
Bridge
NVRAM NVRAM
256 MB DDR 256 MB DDR
64-bit/133 MHz
64-bit/133 MHz
Gigabit
Ethernet
Multifunction
Serial
Gigabit
Ethernet
Multifunction
Serial
Up to
1064 MB/s
Peak
64-bit/
133 MHz
64-bit/
133 MHz
2eSST
VME Bridge
1 GHz
7448 or
7447A
PowerPC
RS170 PMC
Graphics PMC
FPGA PMC
1553 Technology
Chassis Technology
Display Technology
Video
Compression
PMC
Input
Format
Matrix
Processor
Demean
Window
Averager
Target
Window
Average
Background/
Guard
Window
Averager
Cross
Product
Generator
Band
Interleaved
Image
Input
RX Image
Output
Video Input
Processing
Video Server Application
WAVE
Software
Drivers
(PCI Bus)
MPEG-4
Bit-stream
Input 1
MPEG-4 Compression
Input 2
MPEG-4 Compression
TS-PMC with Stratix FPGA
RTP Encapsulated MPEG-4 Bit-stream
Server Configuration via TCP/IP
Video Server CPU
Dual RS-170
MezzanineFPGA PMC
Video Compression PMC
Integrated Bundle
Video Compression Encoder
with Host Decode
Multiprocessor SBC
+ =+
Video Camera
Audio Input
• Capture
• Filter, Format
• Encrypt
• Compress
GPU PMC
Overlay
and
Display
TS-PMC
Capture
and
Compress
Video Camera
Audio Input
TS-PMC
Capture
and
Compress
TS-PMC
Capture
and
Compress
TS-PMC
Capture
and
Compress
• Capture
• Filter, Format
• Encrypt
• Compress
• Graphic Generation
• Overlay
• Display
• Graphic Generation
• Overlay
• Display
Thin Pipe Network
Encrypter Wireless
Network
Multiprocessor SBC
Race ++ PMC Module
Reflective Memory PMC
Module
Multiprocessor BSP
Adding Applications Layer
Mix & Match Platform Advantage Example 2
SIGINT