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Safety Certifiable Middleware for Unmanned Aircraft

Edwin de Jong, PhD

UAS Communication Infrastructure

Vehicle LAN

Data Link

Ground Station LAN

9/9/2014 © 2014 REAL-TIME INNOVATIONS, INC. 2

Baseline Capabilities for UAS Middleware

• Open standards based– Commonality and interoperability

• True peer-to-peer architecture– No single point of failure or vulnerability

• Portable to any communication media– RF, optical links, high-speed interconnects

• Available for heterogeneous environments– Embedded, low-power, small foot-print, RTOS, ARINC 653– Mainstream OS’s (Windows, Linux) and CPUs (Intel)

• Certifiable component (DO-178C)– Integration of UAVs in national airspace

© 2014 REAL-TIME INNOVATIONS, INC. 39/9/2014

Peer-To-Peer Real-Time DataBus

OMG Data Distribution Service

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Control App

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Actuator

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Sensor

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Display App

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Data-Centric IntegrationDistributed Data Model and System State

Source(Key) Latitude Longitude Altitude

RADAR1 37.4 -122.0 500.0

UAV2 40.7 -74.0 250.0

LPD3 50.2 -0.7 0.0


Hundreds Of Applications Rely on DDS


http://www.eso.org/gallery/v/ESOPIA/EELT/E-ELT-2_2008.tif.html

Certification Costs

• DO-178 costs $50-$100 per ELOC

• Process objectives must be met

• All must be documented• Code must be clean

– Testable– No dead code– Deterministic

Level Process Objectives

Code Coverage

A 71 Level B and 100% of MCDC

B 69 Level C plus 100% of DC

C 62 Level D plus 100% of SC

D 26 100% of Requirements

E 0 None


DO-178 Middleware Implications

• Specific implementation withfewer capabilities– Reduced ELOC

• Predictable– No dynamic memory allocation– Applications preconfigured

• Limited size of distributed system– Suiting most avionics systems– Larger size system integration through bridge


Safety-Certifiable DDS Middleware

• Scalable product linefor constrainedenvironments

• Certifiable component– DO-178C Level A– ~25K ELOC

• Follows OMG DDS specification• FACE conformant interface in development


Certification Evidence

• Plan for Software Aspects of Certification (PSAC)

• Software Development Plan (SDP)– Requirements standards– Design standards– Code standards

• Software Verification Plan (SVP)• Software Configuration

Management Plan (SCM)• Software Quality Assurance Plan

• Software Requirements Data• Design Description• Traceability• SQA Records• SCM Records• Software Configuration Index• Software Verification Cases and

Procedures• Software Verification Results• Software Accomplishment

Summary

Certification evidence can be re-used across programs© 2014 REAL-TIME INNOVATIONS, INC. 109/9/2014

Savings from DDS Certification Evidence

30,000 ELOC 20,000 ELOC 10,000 ELOC

Level A $3,000,000 $2,000,000 $1,000,000

Level B $2,550,000 $1,700,000 $850,000

Level C $1,800,000 $1,200,000 $600,000

• DDS certification evidence available at fraction of cost

• Availability at start of project also reduces risk
