• Field Programmable Gate Array Application for Decoding IRIG-B Time Code

      Brown, Jarrod P.; Eglin Air Force Base (International Foundation for Telemetering, 2013-10)
      A field programmable gate array (FPGA) is used to decode Inter-Range Instrumentation Group (IRIG) time code for a PC-based Time-Space-Position Information (TSPI) acquisition. The FPGA architecture can latch time via an external event trigger or a programmable periodic internal event. By syncing time with an external IRIG Group Type B (IRIG-B) signal and using an 8 megahertz (MHz) internal clock, captured time has 125 nanosecond (ns) precision. A Range Instrumentation Control System (RICS) application utilizing the FPGA design to capture IRIG time is presented and test results show matching time accuracy when compared to commercial IRIG time capture hardware components.
    • The Subminiature Flight Safety System (SFSS) Development Progress

      Lambeth, Stephen; Dehmelt, Chris; Eglin Air Force Base; L-3 Communications Telemetry East (International Foundation for Telemetering, 2013-10)
      SFSS is a universal, small, and low cost, functionally redundant flight termination system (FTS) that incorporates encoding, processing and TSPI capabilities, provides critical health/safety/welfare monitoring and allows for highly efficient telemetering of weapon application and FTS data. The SFSS is intended as a solution to provide weapon system developers, test agencies, and range safety officers the ability to track, monitor, and if necessary, terminate all types of weapon systems. The SFSS components are intended to significantly reduce the recurring costs and improve the quality of test support by minimizing physical intrusion into weapon systems, and potentially eliminating the need for warhead removal. In addition, a common hardware suite assists in reducing the overall system cost of acquisition, a key element in today's world of stressed budgets. The SFSS is designed to interface with newly developed weapon systems, while providing the capability to be integrated into existing weapon systems with nominal modifications to the platform. The SFSS development is a multi-disciplinary effort, whose participating organizations include industry suppliers, range and system safety representatives, and technical offices from all branches of the armed services, as well as the weapons vendors to ensure that applicable technical and regulatory requirements are met. The original requirements for the project were defined within the SFSS System Performance Specification (SPS), which has undergone a number of updates as the design effort has progressed from concept to assembly and debug of the prototype components. This paper will provide an overview of the overall program status, key features of the SFSS including features added during development, critical design challenges, and additional activities planned to enhance the functionality of the system.
    • Synchronous Data Pathing: Synchronous Data Bandwidth Requirements and Its Impact on Telemetry Systems

      Uhland, Greg; Eglin Air Force Base (International Foundation for Telemetering, 2013-10)
      With industry standard synchronous data, the clock is effectively over twice the rate of the data (Figure 1.). The resultant problem is increased synchronous infrastructure bandwidth requirements and/or costly system architectures designed to avoid transport of synchronous data. This paper will discuss a potential solution.
    • Theory and Development of a Dynamic HITL Autotrack Evaluation System

      King, Nathan; Davis, Steve; Eglin Air Force Base (International Foundation for Telemetering, 2013-10)
      Telemetry ground antenna tracking performance evaluation and measurement was previously performed by evaluating only the antenna drive system. The integrated nature of software controlled antenna systems has prompted a need to evaluate the entire tracking antenna system, as a whole. Particularly, the ability of an antenna to remain "locked" on a dynamic target must be able to be evaluated and quantified. This paper presents one method for evaluating the tracking ability of a telemetry antenna system and discusses a likely set of metrics to be used as figures of merit for antenna system tracking performance.