Browsing International Telemetering Conference Proceedings, Volume 45 (2009) by Authors
iNET Networking Standards Test BedNewton, Todd A.; Kenney, Joshua D.; Moodie, Myron L.; Grace, Thomas B.; Southwest Research Institute; Naval Air Systems Command (NAVAIR) (International Foundation for Telemetering, 2009-10)The integrated Network-Enhanced Telemetry (iNET) project working groups have developed standards for Telemetry Network Systems (TmNS). In order for the standards to mature, the functionality of the standards will be demonstrated. To achieve this, efforts have been undertaken to simulate (and at times emulate) the key interfaces and to assess performance. To facilitate this work, a common network test bed has been developed. This test bed allows for validation of the iNET standards' performance characteristics.
Key Components of the iNET Test Article StandardGrace, Thomas B.; Kenney, Joshua D.; Moodie, Myron L.; Abbott, Ben A.; Naval Air Systems Command (NAVAIR) (International Foundation for Telemetering, 2009-10)The integrated Network-Enhanced Telemetry (iNET) Test Article Standards Working Group (TASWG) has developed a standard for Telemetry Network System (TmNS). The introduction of Internet Protocol (IP) networks on test ranges has created the potential for greater flexibility in the telemetry environment. This paper discusses the rationale for particular decisions concerning key components mandated by the standard. Performance implications concerning the mandates of the standard are also described. As an educational aid, examples of TAS-based processing philosophies and data structures have been constructed. These examples, including sending and receiving messages, are shown to reinforce understanding core concepts of the standard.
Network Telemetry Link Throughput Maximization ApproachesMoodie, Myron L.; Newton, Todd A.; Abbott, Ben A.; Southwest Research Institute (International Foundation for Telemetering, 2009-10)The use of Ethernet and Internet Protocol (IP) networking technologies in flight test instrumentation and telemetry systems is rapidly increasing, driven by the ubiquity, scalability, and flexibility of networking technologies. Networks first made a positive impact in ground station infrastructure and have recently been emerging in test article data acquisition infrastructure in programs such as the A380, 787, P-8A, and Future Combat Systems. The next logical step is to provide a two-way network telemetry link to fully extend the flexibility of the network between the test articles and ground station. The United States Department of Defense (DoD) integrated Network-Enhanced Telemetry (iNET) program is currently working to build a standardized network telemetry link for exactly this purpose. When developing a network telemetry link, the limited availability of telemetry spectrum must be considered and thus it is critical to choose system-level approaches to maximize the throughput achieved from the link. This paper first presents the statistics of the network data that would typically use this link based on empirical data from current network-based flight test instrumentation systems. Several approaches to using a network telemetry link are then presented. Predicted achievable throughputs of each approach are presented that are derived from the statistics of the empirical test data. Based on this, the paper presents recommendations for building systems using network telemetry links.