Lockheed Martin Corporation

Robert B Groves, Jr

Richard A Allshouse

Gerhard F Meyer

Michael Lamana

A method for communicating safety critical train authorization under the conditions of limited communications capability is disclosed.

Method for managing vital train movements

A method for reducing delays in the receipt of high priority information in a transportation system is disclosed.

Method for maintaining vital guideway operation in high-demand areas

A method and system for reducing, in a centralized train control system, the portion of a centralized server application that is considered vital while not reducing the overall vitality of the system.

Method for isolation of vital functions in a centralized train control system

A mechanism for maintaining configuration or other vital data outside of source code is disclosed. In accordance with the illustrative embodiment of the present invention, a data manager software component serves as an interface between an external configuration data store and one or more applications, processes, and threads. In contrast with techniques of the prior art, the illustrative embodiment does not suffer from the risk of undetected corruption of vital data, and therefore is especially advantageous in safety-critical systems.

Maintaining vitality of data in safety-critical systems

A method for delivering and maintaining mandatory directives data from a central office server to an on-board system. Mandatory directives include the enforceable train control data required for a train operating on controlled track. The method enables the on-board system and the central server to exchange data in a vital manner, in part by checking for any inconsistency between i) the on-board system's data as previously transmitted and ii) the required data as represented by both a transmitted set of data identifiers and an associated error correction code.

Growing community of inventors

Manassas, VA, United States of America

Robert B Groves, Jr