Technology Today

2015 Issue 1

ETEDDS: SYSTEM OF SYSTEMS - Real-time Simulation Environment

ETEDDS: SYSTEM OF SYSTEMS - Real-time Simulation Environment

The End-to-End Distributed Development System (ETEDDS) was developed as a collaborative effort between Raytheon Missile Systems and Lockheed Martin to perform high-fidelity system level simulation testing of the Standard Missile-3 (SM-3) and Aegis Weapon System. The combined weapon system provides sea-based protection against ballistic missile attacks. There is a critical need for testing of the entire weapon system to find potential integration issues and other issues prior to expensive flight testing. In addition, the capability to perform high-fidelity system simulation helps reduce the need for live-fire testing by permitting system performance evaluation over a broad range of scenarios and threats, with the results validated against the more limited live-fire test data.

Reproducing and combining each contractor’s validated models in a collocated laboratory is one method of integration testing, and it is an extremely costly one at that. ETEDDS provides a cost-effective integration approach using an infrastructure to integrate multiple simulated systems in geographically different locations (each contractor uses their own existing facilities). Simulation models of varying levels of fidelity can be selected to best represent test objectives (see Figure 1). For example, lower fidelity models (digital simulations) may be used for the initial integration of algorithms under development, while high-fidelity models (Computer in the Loop [CIL] and Hardware in the Loop [HIL]) may be used to test an integrated system performing a flight test scenario prior to the live fire field test.

Figure 1. ETEDDS allows models of different fidelity to be integrated into one simulation.

ETEDDS Architecture

ETEDDS is a suite of software based on a technology called High Level Architecture (HLA) — a simulation interoperability standard originally developed by the U.S. Department of Defense. HLA is primarily used to define an interface for multiple heterogeneous systems to allow communications and an exchange of information.

One benefit of using HLA is systems retain their proprietary nature when connected. Raytheon can connect with its partners, subcontrac tors and competitors in this manner. In HLA terminology, the components of a simulation are called “federates,” and the collection of multiple federates is called a “federation.” The primary federates within ETEDDS interface directly with the SM-3 missile, the SM-3 kinetic weapon (KW) and the Aegis Weapon System (AWS). Other federates route threat information, collect data, visualize scenes, control simulation components, store information in a database, and analyze data (see Figure 2).

Figure 2. ETEDDS architecture allows multiple systems to be connected together and tested.

Managing a large simulation federation can be challenging, but ETEDDS contains an application that allows a user to launch, control and monitor the federation from a single access point. This reduces the number of staff needed to operate a simulation with multiple components. Operators can also detect anomalies easily due to the ability to see the entire missile engagement in a 3D visualization and to quickly analyze data (see Figure 3).

Having simulation components separated by large distances does present some challenges, especially regarding network latency. ETEDDS has devised technology and methodologies to mitigate network latency issues and yet allow the connected components to operate in real-time.

Figure 3. ETEDDS has a rich tool set for visualization (left), simulation control (right back),

ETEDDS Uses

ETEDDS produces a complete set of data for analyzing individual missile and overall system performance by collecting the tactical communication between the launch ship and the missile along with detailed subsystem in-flight performance data. ETEDDS also tests algorithms under development that may affect systems performance, and it provides a visual representation of the simulation, simplifying and accelerating the assessment of key system attributes.

ETEDDS also plays an important role in flight test preparation for the SM-3 program to help test preparation for the SM-3 program to helpprevent interface errors and to mitigate other live test risks. Simulated target trajectories based on the flight test scenario definition are fed to the ETEDDS simulation to exercise tactical missile and ship hardware and software in a flight test configuration. In 2008, Raytheon engineers used ETEDDS to rapidly test modifications to a special SM-3 missile tailored to destroy a damaged satellite in a decaying orbit. The dead satellite was traveling 17,000 miles per hour and the team had a 15-second window on each of a total of seven days to shoot down the satellite. Mission preparation was completed in just three weeks; the successful intercept took just one shot.

ETEDDS has been in existence for over 10 years and has supported more than 15 flight tests during that time. It has served a dual purpose — to integrate the system for the flight tests and to visualize the test event in real time during flights. ETEDDS is a proven and mature tool suite developed by Raytheon and Lockheed Martin to meet today’s system integration and test needs, and it stands ready to meet the demands of tomorrow.

David H. Stone,
Brian D. McCarty
and Nick Garbarino

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