Model-Based Software Engineering and Ada: Synergy for the Development of Safety-Critical Systems

TL;DR

This paper presents a combined model-based and Ada language approach for developing safety-critical systems, integrating modeling, testing, and code generation to meet strict aerospace standards.

Contribution

It introduces a novel integrated process and toolset that merges model-based development with Ada for safety-critical software, enhancing validation and compliance.

Findings

Successful integration of model-based testing with Ada code generation

Application demonstrated on aerospace fault-tolerant system model

Supports standards like RTCA/DO-178B for safety-critical software

Abstract

In this paper we outline a software development process for safety-critical systems that aims at combining some of the specific strengths of model-based development with those of programming language based development using safety-critical subsets of Ada. Model-based software development and model-based test case generation techniques are combined with code generation techniques and tools providing a transition from model to code both for a system itself and for its test cases. This allows developers to combine domain-oriented, model-based techniques with source code based validation techniques, as required for conformity with standards for the development of safety-critical software, such as the avionics standard RTCA/DO-178B. We introduce the AutoFocus and Validator modeling and validation toolset and sketch its usage for modeling, test case generation, and code generation in a combined approach, which is further illustrated by a simplified leading edge aerospace model with built-in fault tolerance.