• DESIGN OF A GPS/TELEMETRY ANTENNA FOR SMALL DIAMETER PROJECTILES

      Ryken, Marv; Davis, Rick; Kujiraoka, Scott R.; Naval Air Warfare Center Weapons Division (International Foundation for Telemetering, 2000-10)
      In the past, airplanes, target drones, pods, and large missiles have been instrumented with telemetry, flight termination and beacon tracking antennas to assess performance. With the emerging use of the Global Positioning System (GPS) for tracking purposes, GPS is also included as part of the instrumentation package. This paper addresses the design of a conformal wraparound antenna system to cover the telemetry and GPS L1 frequencies for a small (2.75 inch) diameter airborne projectile. A filter is also integrated into the antenna system to isolate the transmitted telemetry signal from the received GPS signal. This integration is necessary due to the lack of space in the small diameter projectile. Performance characteristics of the prototype antenna system are also presented.
    • INVESTIGATION OF TELEMETRY AND GPS COMPATIBILITY

      Law, Eugene; Kingery, Ronald; Cramer, Dave; NAWCWD; Evolving Resources Inc. (International Foundation for Telemetering, 2000-10)
      Several test programs have reported degraded Global Positioning System (GPS) performance when L-band (1435-1535 MHz) telemetry is used while other test programs have had acceptable GPS performance with L-band telemetry. Most test programs seem to have minimal problems with S-band telemetry interfering with GPS performance if a bandpass filter is used between the GPS antenna and the low noise amplifier (LNA). This paper will present measured data on GPS performance with L- and S-band telemetry and explain what must be done to minimize interference to GPS. The paper will present both GPS signal-to-noise ratio (S/N) values as well as measured spectra from telemetry transmitters. System design guidelines for compatible operation will be presented.
    • A STATUS REPORT OF THE JOINT ADVANCED MISSILE INSTRUMENTATION PROGRAM AN OFFICE OF THE SECRETARY OF DEFENSE CENTRAL TEST AND EVALUATION INVESTMENT PROGRAM INITIATIVE

      Scofield, Don; Powell, Dave; Naval Air Warfare Center Weapons Division (International Foundation for Telemetering, 2000-10)
      Joint Advanced Missile Instrumentation (JAMI), a 1997 new-start multi-year Central Test and Evaluation Investment Program (CTEIP), is developing advanced telemetry system components that can be used in an integrated instrumentation package for tri-service small missile test and training applications. JAMI will provide telemetry, Time-Space-Position Information (TSPI), flight termination and end-game vector scoring in a low cost, modular package that will allow world-wide test and training- eliminating, in most cases, the need for range-specific (or multi-system) facilities. JAMI will incorporate Global Positioning System (GPS)-based technology as the TSPI and vector scoring engine, and is completing the development of a solid state programmable safe and arm device for flight safety applications. The JAMI program has progressed into Phase 2 and full-scale development of advanced GPS technologies. This paper discusses the progress of the program during the past year and the efforts planned for fiscal year 2000. Testing of GPS receivers and problems encountered in programming GPS simulator for missile flight profiles are discussed.