• Connecting Network-Based Data Acquisition Nodes to the Network

      Hildin, John; Teletronics Technology Corporation (International Foundation for Telemetering, 2008-10)
      Unlike communications protocols that are bus-based or multi-drop (e.g., CAIS Bus, Fibre Channel, RS-485), Ethernet relies on a point-to-point connection topology. One reason for this approach is to allow network nodes to negotiate their individual mode of communication with the network, i.e., link speed and duplexity. The goals of this paper are twofold. The first goal is to describe the process of link negotiation between nodes. This will include some of the details of how two physical layer devices establish communication. The second goal is to show how networked data acquisition nodes are physically connected within the overall system.
    • Design and Implementation of an Avionics Full Duplex Ethernet (A664) Data Acquisition System

      Perez, Alberto; Hildin, John; Roach, John; Teletronics Technology Corporation (International Foundation for Telemetering, 2008-10)
      ARINC 664 presents the designers of data acquisition systems challenges not previously seen on other aircraft avionic buses. Among the biggest challenges are providing the test instrumentation system with the capacity to process two redundant Ethernet segments that may be carrying packet traffic at near wire-line speed. To achieve this level of performance, the hardware and software must not only perform mundane operations, like time stamping and simple virtual link MAC filtering, but also need to implement core ARINC 664 functions like redundancy management and integrity checking. Furthermore, other TCP/IP operations, such as IP header checksum, must also be offloaded to the hardware in order to maintain real-time operation. This paper describes the implementation path followed by TTC during its development of an ARINC 664 network monitor used in a large commercial aircraft flight test program.
    • The Design of a High-Performance Network Transceiver for iNET

      Lu, Cheng; Cook, Paul; Hildin, John; Roach, John; Teletronics Technology Corporation (International Foundation for Telemetering, 2008-10)
      A critical element of the proposed iNET architecture is the development of a telemetry network that provides two-way communication between multiple nodes on both the ground and in the air. Conventional airborne telemetry is based on IRIG-106 Chapter 4 and provides only a serial streaming data path from the aircraft to the ground. The network-centric architecture of iNET requires not only a duplex communication link between the ground and the test article, but also a communication link that provides higher bandwidth performance, higher spectrum efficiency, and a transport environment that is capable of fully packetized Internet Protocol. This paper describes the development path followed by TTC in the implementation of its nXCVR-2000G, an OFDM 802-11a-based iNET-ready IP transceiver.
    • Designing an Object-Oriented Data Processing Network

      Yang, Hsueh-szu; Sadia, Nathan; Kupferschmidt, Benjamin; Teletronics Technology Corporation (International Foundation for Telemetering, 2008-10)
      There are many challenging aspects to processing data from a modern high-performance data acquisition system. The sheer diversity of data formats and protocols makes it very difficult to create a data processing application that can properly decode and display all types of data. Many different tools need to be harnessed to process and display all types of data. Each type of data needs to be displayed on the correct type of display. In particular, it is very hard to synchronize the display of different types of data. This tends to be an error prone, complex and very time-consuming process. This paper discusses a solution to the problem of decoding and displaying many different types of data in the same system. This solution is based on the concept of a linked network of data processing nodes. Each node performs a particular task in the data decoding and/or analysis process. By chaining these nodes together in the proper sequence, we can define a complex decoder from a set of simple building blocks. This greatly increases the flexibility of the data visualization system while allowing for extensive code reuse.
    • iNET Based Automatic Hardware Selection

      Kupferschmidt, Benjamin; Teletronics Technology Corporation (International Foundation for Telemetering, 2008-10)
      One of the principle goals of the Integrated Network Enhanced Telemetry (iNET) program is to help flight-test engineers configure their data acquisition systems more rapidly. This will allow them to focus more of their energies on the collection of data rather than on the design and configuration of their data acquisition hardware. Currently most flight-test engineers spend the majority of their time configuring their data acquisition systems to acquire data for test flights. Typically, the flight test engineers must manually transform the requirements that are given to them into actual measurements from the data acquisition system. This process forces the flight test engineers to become experts in the implementation details of their data acquisition systems. This paper will discuss a possible design for an automatic hardware selection system. This system would allow flight test engineers to step away from the implementation details of their data acquisition system and focus instead on the parameter data that the system is acquiring. The key design goal for this system is to create a mechanism that can automatically transform the requirements for a flight test program into a list of hardware that can accomplish the desired task.
    • Managing Instrumentation Networks

      Pesciotta, Eric; Teletronics Technology Corporation (International Foundation for Telemetering, 2008-10)
      As traditional data acquisition systems give way to network-based data acquisition systems a new approach to instrumentation configuration, management and analysis is required. Today, most flight test programs are supported by traditional instrumentation systems and software. Pockets of network-based systems exist but are typically entirely new, closed systems. Relatively soon, test articles will emerge with a mixture of equipment. The merger of traditional and networked instrumentation is inevitable. Bridging the gap in software tools is a non-trivial task. Network-based data acquisition systems provide expanded flexibility and capabilities well beyond traditional systems. Yet pre-existing equipment requires traditional configuration and analysis tools. Traditional flight test software alone cannot fully exploit the added benefits gained from such mergers. The need exists for a new type of flight test software that handles existing instrumentation while also providing additional features to manage a network of devices. Network management is new to flight test software but a thoughtful implementation can facilitate easy transition to these modern systems. This paper explores the technologies required to satisfy traditional system configuration as well as the less understood aspects of network management and analysis. Examples of software that meet or exceed these requirements are provided.
    • Migrating Airborne Instrumentation Systems from PCM to Network

      Berdugo, Albert; Teletronics Technology Corporation (International Foundation for Telemetering, 2008-10)
      The majority of currently operating flight test programs around the world utilize PCM-based airborne instrumentation systems. Most instrumentation engineers are very comfortable with PCM-based data acquisition systems, and feel uncomfortable when talking about network implementations and the adoption of iNET. In order for these engineers to embrace this new technology, migrating from a PCM to network topology must be done in an evolutionary manner that provides for the preservation of capital investment while introducing new system concepts that enhance current instrumentation systems. This paper describes hardware components that enable instrumentation engineers to migrate their existing PCM-based instrumentation system to a network-based system. Several of these components are discussed to illustrate how they provide a controlled migration path to a network-based system. These components include time distribution, gateways, network data selectors, network switches, transmitters, transceivers, and recorders.
    • Networked Data Acquisition Systems for the Army FCS Program

      Pesciotta, Eric; Roach, John; Sadia, Nathan; Yang, Hsueh-szu; Teletronics Technology Corporation (International Foundation for Telemetering, 2008-10)
      Teletronics Technology Corp. has been involved in the research and development of networked data acquisition systems for use in airborne instrumentation for several years. Recently, TTC successfully applied the advanced technology that was developed during these airborne efforts to a terrestrial application involving Army ground vehicles. The Future Combat Systems Program (FCS) for the U.S. Army recently solicited a networked-based solution to the problem of acquiring real-time data specific to the training of soldiers operating visual targeting systems within Bradley Armored Vehicles and Abrams Battle Tanks. This paper describes the High-Speed Digital Recording system, a network-based data acquisition system designed to allow for the recording of high-resolution (up to 1600x1280) RGB video, user-selected Ethernet packets, along with audio and GPS time information.
    • Telemetry Re-Radiation System

      Cook, Paul; Natale, Louis; Teletronics Technology Corporation; Lockheed Martin Aeronautics Co. (International Foundation for Telemetering, 2008-10)
      Enclosed weapon bays on modern aircraft interfere with prelaunch, Flight Termination System verification during training test launches. Range safety personnel need to verify the functionality of the flight termination system prior to missile launch. The missile telemetry RF is highly attenuated when the aircraft missile bay doors are closed, limiting the range for which the aircraft can fly during training flights. Teletronics Technology Corporation and Lockheed Martin designed a system to provide telemetry data for these aircraft. The system re-radiates the telemetry from the missiles with the weapon bay doors closed. This paper describes the design considerations for this flexible system that accommodates multiple weapon systems in multiple weapon bay configurations.
    • Utilization of an IEEE 1588 Timing Reference Source in the iNET RF Transceiver

      Lu, Cheng; Roach, John; Sasvari, George; Teletronics Technology Corporation (International Foundation for Telemetering, 2008-10)
      Synchronization of the iNET communication link is essential for implementing the TDMA channel access control functions within the transceiver MAC transport layer, and providing coherent signal demodulation timing at the transceiver PHY layer. In the following implementation, the 1588 timing reference source is the GPS receiver. Because it is being used in the Ground Station Segment and Test Article Segment, it becomes feasible to utilize the 1588 timing reference for cross-layer (MAC+PHY) iNET transceiver synchronization. In this paper, we propose an unified iNET transceiver synchronization architecture to improve iNET transceiver performance. The results of the synchronization performance analysis are given.
    • Wireless Sensor System for Airborne Applications

      Pellarin, Steve; Grossman, Hy; Musteric, Steven; Teletronics Technology Corporation; Eglin Air Force Base (International Foundation for Telemetering, 2008-10)
      Adding an instrumentation / telemetry system to a test article has historically required an intrusive installation. Power, wiring, and available space typically present significant challenges. There has been a long-standing need in the test and training community for a non-intrusive, flexible and modular instrumentation and telemetry system that can be installed on an aircraft or other test article without the need for permanent modifications. In addition, as available space in aircraft weapon bays, small weapons, and unmanned vehicles becomes a premium, the miniaturization of remote sensors and telemetry units becomes critical. This paper describes the current status of the Advanced Subminiature Telemetry System (ASMT) Initial Test Capability Project. It discusses the progress to date in fielding an operational, wireless sensor system that may be installed on the aircraft skin using an Electro-Cleavable adhesive as an alternative to conventional mounting methods. The wireless sensor utilizes the Wireless Communications Standard for Wireless Personal Area Network™ (WPAN™) IEEE 802.15 Working Group standard (commonly referred to as Bluetooth) to establish communication between the sensor and controller modules. Results of aircraft ground testing for EMI compatibility with aircraft systems will be presented. It is also expected that actual flight test results will be available by the time the paper goes to publication.