• Automatic Modulation Recognition for Aeronautical Telemetry

      Frogget, Jacob; Rice, Michael; Brigham Young University (International Foundation for Telemetering, 2013-10)
      This paper applies the Bianchi-Loubaton-Sirven technique to classification algorithm capable of distinguishing between PCM/FM and SOQPSK-TG. A happy byproduct of the classification algorithm is a reasonably accurate estimate of the bit rate. The classifier is based on the observation that CPM with an integer modulation index contains harmonics at multiples of the symbol rate. The algorithm is based on the CPM representations of PCM/FM and SOQPSK-TG and leverages the property that applying a g-order nonlinearity to any CPM creates a new CPM with modulation index g times the original modulation index. No prior knowledge of the data is assumed. The technique is applied to distinguish between PCM/FM and SOQPSK-TG. Simulation results show that the classifier works essentially error-free for signal-to-noise ratios above 20 dB and for sufficiently high resolution in the search algorithms required by the maximizations.
    • Does a Spinning Missile Cause Tracking Error at C-Band?

      Rice, Michael; Karchner, Darren; Brigham Young University (International Foundation for Telemetering, 2013-10)
      The amplitude fluctuation induced by the spinning missile acts as a disturbance on conscan. In addition, if a tracking system converts from S-band to C-band, the beamwidth is narrower and the wrap-around antenna on the missile requires more patches, and so the margin of error for tracking decreases. Tracking performance is simulated with a spinning missile with ballistic and fly-by trajectories while running at C-band. The spinning missile causes a periodic component in the pointing error, and when the conscan frequency is an integer multiple of the roll rate, conscan may lose track of the target. Remedial techniques are discussed, including increasing the conscan frequency and using monopulse tracking rather than conscan.
    • An LED Light Suit for Dancers

      Rice, Michael; McMurdie, Andrew; Brigham Young University (International Foundation for Telemetering, 2013-10)
      This paper describes the architecture, design, and performance of a dancing outfit equipped with LEDs and controlled by radio. The lights perform a "choreography" in synchronism with the music. The outfits were worn by a BYU dancing team (the "Cougarettes") for one of their dance routines.
    • Polarization Diversity in the Presence of Multipath Propagation

      Wagner, Grant; Rice, Michael; Brigham Young University (International Foundation for Telemetering, 2013-10)
      The possibility of polarization diversity using left and right hand circular polarization (LHCP and RHCP) in the presence of multipath propagation is examined. We show that there are differences in the received signal for LHCP and RHCP for a number of realistic scenarios. Because multipath propagation can produce different LHCP and RCHP signals, there exists the possibility for diversity improvement involving the two polarizations.