• DEVELOPMENT OF A NETWORK-CENTRIC DATA ACQUISITION, RECORDING, AND TELEMETRY SYSTEM

      Moodie, Myron; Newton, Todd; Abbott, Ben; Southwest Research Institute (International Foundation for Telemetering, 2007-10)
      The growth of the Internet and the resulting increasing speeds and decreasing prices of network equipment have spurred much interest in applying networks to flight test applications. However, the best-effort, variable-latency nature of network transport causes challenges that must be addressed to provide reliable data acquisition and timing performance. This paper describes the major issues that must be addressed when designing and implementing real-time networking applications. An overview of a recently implemented large-scale, network-centric data acquisition, recording, and telemetry system for commercial flight test applications provides a real-world example of what is currently achievable.
    • EVALUATION OF UBIQUITIOUS USE OF WIRELESS SENSOR NETWORK TECHNOLOGY IN DATA ACQUISITION AND TELEMETRY APPLICATIONS

      Kenney, Joshua D.; Cunningham, Chris J.; Abbott, Ben A.; Southwest Research Institute (International Foundation for Telemetering, 2007-10)
      Industrial wireless sensor networks can be designed to meet the strict requirements of specific distributed applications. Emerging standards have enabled the development of low-cost, lowpower sensor nodes that are quickly becoming a commodity, enabling the realization of efficient and reliable data acquisition and telemetry in many systems. Moreover, new and exciting possibilities arise from the distributed computing power of the sensor nodes, the ability to monitor and aggregate data across large arrays of sensors, and the ability to model dynamic and rugged environments that were previously beyond the reach of traditional data acquisition and telemetry systems.
    • MANAGEMENT OF NETWORK-BASED FLIGHT TEST SYSTEMS

      Moore, Michael S.; Grim, Evan T.; Kamat, Ganesh U.; Moodie, Myron L.; Southwest Research Institute (International Foundation for Telemetering, 2007-10)
      Network-based instrumentation systems are rapidly replacing traditional fixed serial interconnected instrumentation in both commercial and military flight test environments. Modern network-based flight test systems are composed of large numbers of devices including high-speed network switches, data acquisition devices, recorders, telemetry interfaces, and wireless network transceivers, all of which must be managed in a coordinated fashion. Management of the network system includes configuring, controlling, and monitoring the health and status of the various devices. Configuration by hand is not a realistic option, so algorithms for automatic management must be implemented to make these systems economical and practical. This paper describes the issues that must be addressed for managing network-based flight test systems and describes a network management approach that was developed and employed to manage a large-scale network-based flight test system.
    • NETGEN: A MODEL-DRIVEN TOOL FOR RAPID PROTOTYPING AND SIMULATION OF NETWORK-BASED FLIGHT TEST SYSTEMS

      Price, Jeremy C.; Moore, Michael S.; Southwest Research Institute (International Foundation for Telemetering, 2007-10)
      When network-centric flight test system components are developed concurrently, it is necessary to produce relevant simulated network traffic for exercising the network devices and other processing subsystems prior to system integration. Having an accurate and repeatable pattern of simulated network traffic is extremely important for debugging and subsystem integration. The simulated network traffic must be both representative of the real system and repeatable to aid test efforts. Our solution to this problem was to develop a model-driven network traffic generator – NETGEN. Using NETGEN to resolve errors, stress test, and verify requirements, we have achieved otherwise unattainable correctness, reliability, and success in our systems.
    • REORDERING PACKET BASED DATA IN REAL-TIME DATA ACQUISITION SYSTEMS

      Kilpatrick, Stephen; Rasche, Galen; Cunningham, Chris; Moodie, Myron; Abbott, Ben; Southwest Research Institute (International Foundation for Telemetering, 2007-10)
      Ubiquitous internet protocol (IP) hardware has reached performance and capability levels that allow its use in data collection and real-time processing applications. Recent development experience with IP-based airborne data acquisition systems has shown that the open, pre-existing IP tools, standards, and capabilities support this form of distribution and sharing of data quite nicely, especially when combined with IP multicast. Unfortunately, the packet based nature of our approach also posed some problems that required special handling to achieve performance requirements. We have developed methods and algorithms for the filtering, selecting, and retiming problems associated with packet-based systems and present our approach in this paper.