• Graph Theoretic Modeling and Energy Analysis of Wireless Telemetry Networks

      Cetinkaya, Egemen K.; Kosbar, Kurt; Shatto, Tristan A.; Telemetry Learning Center Department of Electrical and Computer Engineering, Missouri University of Science and Technology (International Foundation for Telemetering, 2017-10)
      Network science provides essential tools to model and analyze topology and structure of dynamic wireless telemetry networks. In this paper, we model wireless telemetry networks using three well-known graph models: Gilbert random graph, Erdos-Renyi random graph, and random geometric graph models. Next, we analyze the connectivity of synthetically generated topologies using graph energy, which is the sum of absolute values of eigenvalues. Our results indicate second-order curves for adjacency and Laplacian energies as the connectivity of synthetically generated networks improve. The normalized Laplacian energy decreases, converging to the theoretical lower bound as the connectivity reaches to a maximum.
    • INEXPENSIVE UHF TRANSCEIVER LEVERAGING COTS COMPONENTS

      Kosbar, Kurt; Chiaventone, Owen; Avola, Kyle; Tuschhoff, Stetson; Missouri University of Science and Technology (International Foundation for Telemetering, 2017-10)
      This paper describes the design of an inexpensive UHF transceiver which leverages some of the recently developed commercial off-the-shelf (COTS) components. The initial goal is to implement digital voice transmit and receive function, although the design can accommodate a wide range of digital communication and telemetry applications. The handheld transceiver transmits 5 watts of power in the 430-435 MHz UHF band. A 1.2 kHz wide GFSK modulation format is used, generated by a Silicon Labs radio chip. The recently released Raspberry Pi Zero processor implements a low bit rate audio coding which conforms to the Codec2 standard. The transceiver fits in a 3 cm x 8 cm x 14 cm volume. It is powered by two 18650 lithium ion cells, and draws approximately 1 watt of power during receive, and 6 watts during transmission.
    • OPTIC FIBER SENSOR FOR STRAIN MEASUREMENTS IN HIGH TEMPERATURE SENSING APPLICATIONS

      Huang, Jie; Kosbar, Kurt; White, Julia; Department of Electrical and Computer Engineering, Missouri University of Science and Technology (International Foundation for Telemetering, 2017-10)
      Optic fiber sensors are employed in a variety of applications for the remote measurement of various parameters such as strain, pressure, or temperature. These sensors offer an array of benefits as well including light weight, compactness, and high resolution. In particular, Fabry-Perot interferometers (FPIs) maintain these benefits and can also be made to withstand extremely high temperatures. This advantage of the FPI allows it to be used in harsh environments where many other tools for parameter measurement could not survive. An FPI strain sensor is constructed and tested which has the capabilities to be used at high temperatures of over 1000°C for applications in gas turbine engine testing. This paper discusses the need for high temperature strain sensors in engine testing and this sensor’s capabilities in this application.
    • PERFORMANCE EVALUATION FOR DECISION-FEEDBACK EQUALIZER WITH PARAMETER SELECTION ON UNDERWATER ACOUSTIC COMMUNICATION

      Nassr, Husam; Kosbar, Kurt; Missouri University of Science and Technology (International Foundation for Telemetering, 2017-10)
      This paper investigates the effect of parameter selection for the decision feedback equalization (DFE) on communication performance through a dispersive underwater acoustic wireless channel (UAWC). A DFE based on minimum mean-square error (MMSE-DFE) criterion has been employed in the implementation for evaluation purposes. The output from the MMSE-DFE is input to the decoder to estimate the transmitted bit sequence. The main goal of this experimental simulation is to determine the best selection, such that the reduction in the computational overload is achieved without altering the performance of the system, where the computational complexity can be reduced by selecting an equalizer with a proper length. The system performance is tested for BPSK, QPSK, 8PSK and 16QAM modulation and a simulation for the system is carried out for Proakis channel A and real underwater wireless acoustic channel estimated during SPACE08 measurements to verify the selection.
    • PERFORMANCE OF IEEE 802.11S FOR WIRELESS MESH TELEMETRY NETWORKS

      Kosbar, Kurt; Zawodniok, Maciej; Price, Nathan D.; Chandran, Arul Mathi Maran; Missouri University of Science and Technology (International Foundation for Telemetering, 2017-10)
      Wide area sensor networks have numerous agricultural, industrial, scientific, medical, and military applications. For many years now, such networks have been implemented through wireless mesh networks. As wireless mesh networks have come to maturity, several network standards have become readily available. The WiFi mesh extension 802.11s was finalized in 2008 and officially adopted into the 802.11 standard in 2012, is extremely interesting thanks to the wide spread adoption of WiFi and low cost. In this paper, we evaluate the performance of a small 802.11s net-work implemented on low-cost, off-the-shelf single board computers for the purpose of building a telemetry sensor network.
    • Permanent Magnet Synchronous Motor Variable Frequency Drive System

      Kosbar, Kurt; Schad, Judah; Nichols, Cameron; Brinker, Katelyn; Missouri University of Science and Technology (International Foundation for Telemetering, 2017-10)
      This paper discusses a permanent magnet synchronous motor (PMSM) variable frequency drive (VFD) system developed for an all-terrain Wifi-HaLow connected (802.11ah, 900 MHz) modular electric vehicle that competed in the Mars University Rover Challenge (URC). The quadrature axis flux linkage for each motor was estimated using on-board voltage and current measurements. A synchronous control algorithm tracked the electromagnetic operating parameters, which are highly dependent on variations in motor construction and load conditions. A feed-forward model-driven observer solution calculated flux linkage angles by direct-quadrature-zero transformation of three-phase shunt currents using DSP processors.
    • POWER TELEMETRY ONBOARD A SEMI-AUTONOMOUS MARS ROVER

      Kosbar, Kurt; Mormile, Melanie; Marcolina, Rebecca C.; Osibodu, Olugbenga O.; Missouri University of Science and Technology (International Foundation for Telemetering, 2017-10)
      This paper explores the telemetry of the power distribution system utilized onboard a semi-autonomous Mars rover. The Missouri S&T Mars Rover Design Team designs and fabricates such a rover to compete in the University Rover Challenge, a competition whose tasks simulate a future manned mission to Mars. To maximize efficiency during competition, the rover’s modular power distribution system consists of three separate units: a 72 Watt-hour, Lithium-polymer battery pack; a custom Battery Management System (BMS); and a central power board. The BMS and power board measure and process electrical and environmental data autonomously, creating a self-regulating system onboard the rover. The two also form a communication chain between team teleoperators and the battery pack. This continuous stream of real-time data enables the team to quickly monitor the rover’s safe operation, to make informed decisions during competition, and to apply this data to the design of future power systems.
    • TELEMETRY SYSTEM FOR INTERCOLLEGIATE ROCKET ENGINEERING COMPETITION VEHICLE

      Kosbar, Kurt; Kitchen, Seth; Klinger, Daniel; Telemetry Learning Center Department of Electrical and Computer Engineering Missouri University of Science and Technology (International Foundation for Telemetering, 2017-10)
      This paper describes a telemetry system for a high-powered rocket entered in the Intercollegiate Rocket Engineering Competition hosted by the Experimental Sounding Rocket Association. On-board the rocket GPS coordinates,acceleration, magnetic field and lux readings are collected,along with other data. The data is sent between internal systems using commercial Internet-of-Things boards that utilize IEEE 802.11 wireless protocols. The aggregated data is transmitted to a ground station through a monopole transmitting antenna and custom designed helical receiving antenna such that in the event of a crash, data is not lost. The ground station data recovery is performed using a commercial XBee transceiver, before being displayed in real time for tracking and safety purposes,and stored for future data analysis. The target apogee is 9 km, so real time GPS data will be useful for both tracking and vehicle recovery operations.