• AN AIRBORNE NETWORK TELEMETRY LINK

      Temple, Kip; Laird, Daniel; Edwards Air Force Base (International Foundation for Telemetering, 2006-10)
      In a quest to provide networked communication to test assets at all of the Major Range and Test Facility Bases (MRTFB), the integrated Network Enhanced Telemetry (iNET) Program was formed. A study was accomplished outlining five environments that encompass the work of these MRTFBs. The first of these environments to be advanced towards networked communication is the Aeronautical Environment. In order to develop these technologies, a test platform is proposed, realized, and tested. This airborne test platform will be used for concept and product testing and validation of the three portions of the Telemetry Network System (TmNS); the vehicle network, vNET, the radio frequency network (RF), rfNET, and the interface to the ground network, gNET. This paper will present the baseline system configuration, describe its operation, and detail RF link testing results.
    • COMMUNICATIONS OVER AIRCRAFT POWER LINES: A PRACTICAL IMPLEMENTATION

      Tian, Hai; Trojak, Tom; Jones, Charles H.; Teletronics Technology Corporation; Edwards Air Force Base (International Foundation for Telemetering, 2006-10)
      This paper presents a practical implementation of a hardware design for transmission of data over aircraft power lines. The intent of such hardware is to significantly reduce the wiring in the aircraft instrumentation system. The potential usages of this technology include pulse code modulation (PCM), Ethernet and other forms data communications. Details of the fieldprogrammable gate array (FPGA) and printed circuit board (PCB) designs of the digital and analog front end will be discussed. The power line is not designed for data transmission. It contains considerable noise, multipath effects, and time varying impedance. Spectral analysis data of an aircraft is presented to indicate the difficulty of the problem at hand. A robust modulation is required to overcome the harsh environment and to provide reliable transmission. Orthogonal frequency division multiplexing (OFDM) has been used in power line communication industry with a great deal of success. OFDM has been deemed the most appropriate technology for high-speed data transmission on aircraft power lines. Additionally, forward error correction (FEC) techniques are discussed.
    • CPFSK, FQPSK-JR and ARTM CPM ON A ROCKET LAUNCH

      Wolf, Glen; Ortigoza, Saul; Streich, Ronald G.; Edwards Air Force Base (International Foundation for Telemetering, 2006-10)
      A rocket launch, as high dynamics target, was used to demonstrate X-band tracking and also to verify high bit rate frequency planning while demonstrating significant bandwidth reduction with IRIG standard advanced modulation methods. X-band tracking by a modified 8-foot mobile telemetry antenna was excellent. Three separate S-band transmitters with three separate wraparound antennas were launched as a piggyback payload on an Enhanced Orion sounding rocket at White Sands Missile Range (WSMR) to compare the performance of 10 Mbs and 20 Mbs bit error rate (BER) pattern data transmission from CPFSK, FQPSK-JR and ARTM CPM modulation formats under high dynamic conditions. The test is more remarkable in that another S-band wideband spread spectrum signal was also transmitted with good success. These results show that all three modulation methods performed well during ignition and liftoff, low aspect angle (receiving through the rocket motor plume during ascent from a tracker near the launch pad), spin stabilization antenna lobe fades and payload tumbling. Spectrum pictures are provided to show the dramatic reduction in transmission bandwidth from CPFSK to FQPSK-JR to ARTM CPM. Confirmation of the preflight RF adjacent channel interference planning procedures from IRIG 106-05 is described by spectrum pictures and data quality measurements.
    • ENHANCEMENTS TO THE DATA DISPLAY MARKUP LANGUAGE

      Graul, Michael; Fernandes, Ronald; Hamilton, John L.; Jones, Charles H.; Morgan, Jon; Knowledge Based Systems, Inc; Edwards Air Force Base (International Foundation for Telemetering, 2006-10)
      This paper presents the description of the updated Data Display Markup Language (DDML), a neutral format for data display configurations. The development of DDML is motivated by the fact that in joint service program systems, there is a critical need for common data displays to support distributed T&E missions, irrespective of the test location, data acquisition system, and display system. DDML enables standard data displays to be specified for any given system under test, irrespective of the display vendor or system in which they will be implemented. The version 3.0 of DDML represents a more mature language than the version 1.0 presented at the 2003 ITC. The updated version has been validated for completeness and robustness by developing translators between DDML and numerous vendor formats. The DDML schema has been presented to the Range Commander’s Council (RCC) Data Multiplex Committee for consideration for inclusion in the IRIG 106 standard. The DDML model will be described in terms of both the XML schema and the UML model, and various examples of DDML models will be presented. The intent of this paper is to solicit specific input from the community on this potential RCC standard.
    • INSTRUMENTING AN AIRBORNE NETWORK TELEMETRY LINK

      Laird, Daniel; Temple, Kip; Edwards Air Force Base (International Foundation for Telemetering, 2006-10)
      The Central Test and Evaluation Investment Program (CTEIP) Integrated Network Enhanced Telemetry (iNET) program is currently testing a wireless local area networking (WLAN) in an L-band telemetry (TM) channel to evaluate the feasibility and capabilities of enhancing traditional TM methods in a seamless wide area network (WAN). Several advantages of networking are real-time command and control of instrumentation formats, quick-look acquisition, data retransmission and recovery (gapless TM) and test point real-time verification. These networking functions, and all others, need to be tested and evaluated. The iNET team is developing a WLAN based on 802.x technologies to test the feasibility of the enhanced telemetry implementation for flight testing.
    • An Overview Of An Instrumentation Hardware Abstraction Language

      Hamilton, John; Fernandes, Ronald; Koola, Paul; Jones, Charles H.; Knowledge Based Systems, Inc; Edwards Air Force Base (International Foundation for Telemetering, 2006-10)
      In this paper we provide the motivation for a neutral instrumentation hardware abstraction language that is focused on the description and control of instrumentation systems and networks. We also describe the design approach and structure of such a language that meets the needs. The language design is described according to the three roles it must serve: (1) as a descriptive language for specifying and describing the components and configuration of an instrumentation system, (2) as a command language for issuing configuration and data commands to instrumentation hardware and (3) as a query language for requesting the current state of instrumentation hardware.
    • WHAT IF T&E HAD INFINITE SPECTRUM?

      Jones, Charles H.; Edwards Air Force Base (International Foundation for Telemetering, 2006-10)
      The availability of spectrum has been decreasing while requirements have been increasing. One way of answering the question of how much impact this has is to ask how much spectrum would be used in an ideal situation. A way of getting a handle on this question is to look at how much data is recorded onboard test vehicles. We can assume that, if we could, we would transmit everything we currently record. This would be ideal since we could then consider the onboard recorders as backup and we would have all data available in case of catastrophe. This paper looks at onboard recording and telemetry trends to see what percentage of data has been and will be telemetered. This analysis involves several levels in that telemetry requirements are not limited to transmission over a single frequency. It is common to have more than one vehicle involved in an operation. Thus, different scenarios are evaluated from single vehicle operations to larger scale test and training operations. When considered from this point of view, the impact becomes quite clear: the T&E community is making significant compromises on telemetering data. Therefore, current efforts to obtain more spectrum for telemetry use through the World Radio Conference are well justified.