• 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.
    • USE OF LTE FOR CELLULAR RANGE TELEMETRY (CRTM): A SIMULATION STUDY

      Krishnamoorthy, Arvind; Nokia Networks (International Foundation for Telemetering, 2017-10)
      The 3GPP LTE standard was primarily designed for terrestrial cellular usage. The potential use of LTE for cellular range telemetry produces some unique technical challenges for LTE technology. In this paper we examine these challenges in detail, and through the use of system level simulations identify the sensitivity of the performance of LTE-based cellular range telemetry system performance to key factors such as the ground station antenna pattern and orientation, the propagation model assumed, the number of transmit and receive antenna at the ground station, altitude of the airborne test article, etc.
    • METER-LEVEL TDOA MULTILATERATION SYSTEM BASED ON HIGH PRECISION PHASE SYNCHRONIZATION OVER FIBER OPTICAL LINKS

      Tian, Jie; Hou, Dong; Xie, Nan; Cheng, Yongsheng; Institute of Electronic Engineering, China Academy of Engineering Physics; School of Automation Engineering, University of Electronic Science and Technology of China (International Foundation for Telemetering, 2017-10)
      The accuracy of TDOA estimation between sites affects the final positioning calculating the performance of the target. The problem needs to be solved in the multi-station localization systems, requires highly accurate phase synchronization for consistency errors cancellation of receivers. In this paper, the impact of phase error on TDOA localization is analyzed briefly, and we proposed a TDOA multi-station positioning system based on a phase synchronization technique via a long round-trip FOL. By comparing with an actual GPS timing TDOA based method, we demonstrated that the performance of the proposed technique can approximately triple the positioning precision. The simulation results show that the FOL synchronization technique can be used as a potential synchronization method of TDOA multilateation system due to its effective phase error cancellation.
    • AUTOMATING VERIFICATION FOR LEGACY SYSTEMS: A CASE STUDY OF TECHNOLOGY SUSTAINMENT WITHIN THE NASA SPACE NETWORK

      Irvin, Dana; Otranto, John; Lokshin, Kirill; Puri, Amit; Ingenicomm, Inc. (International Foundation for Telemetering, 2017-10)
      The NASA Space Network (SN), which consists of the geosynchronous Tracking and Data Relay Satellite (TDRS) constellation and its associated ground elements, is a critical national space asset that provides near-continuous, high-bandwidth telemetry, command, and communications services for numerous spacecraft and launch vehicles. The Space Network includes several key ground system elements, one of which is the White Sands Complex Data Interface Service Capability (WDISC). The WDISC has undergone multiple cycles of modification and technology refresh over its lifetime, making test automation an attractive option for reducing system verification and validation cost. This paper considers the implementation of automated testing for the WDISC as a case study in technology sustainment, discusses the principal benefits and challenges of implementing test automation for a legacy system, and presents findings that demonstrate the effectiveness of such automation models.
    • EFFECTS OF AERONAUTICAL CHANNEL DYNAMICS ON THE PERFORMANCE OF LINK DEPENDENT ADAPTIVE RADIO (LDAR)

      Alam, Tasmeer; Morgan State University, Electrical and Computer Engineering Department (International Foundation for Telemetering, 2017-10)
      This paper includes aeronautical channel dynamics in the flight simulations of the Link Dependent Adaptive Radio (LDAR) for realistic measurement of the throughput gain with the adaption of the modulation and coding parameters for aeronautical telemetry. Previously, the LDAR flight simulator used a fixed channel for different phases of the flight. This paper shows the performance of LDAR using a dynamic channel created by the customized two ray channel model considering delay spread, Doppler and other channel dynamics. The merger of such dynamic channel simulator with the LDAR flight simulator could help the telemetering community by providing reliable simulation results before test flights.
    • OPTIMIZING CODED 16-APSK FOR AERONAUTICAL MOBILE TELEMETRY

      Rice, Michael; Josephson, Chad; Perrins, Erik; BYU, Dept Elec & Comp Eng; Univ Kansas, Dept Elec Eng & Comp Sci (International Foundation for Telemetering, 2017-10)
      This paper investigates the application of 16-APSK modulation to aeronautical mobile telemetry. The peak-to-average power ratio vs. code rate tradeoff is mapped to an optimization problem involving spectral efficiency and the constellation parameters. The optimization results produce a theoretically optimum solution that is 3.95 times more spectrally efficient as uncoded SOQPSK-TG. When implementation losses and the available IRIG 106 LDPC code rates are factored in, the advantage drops to 3.20 times the spectral efficiency of SOQPSK-TG.
    • A DISTRIBUTED SENSOR NETWORK FOR AN OFF-ROAD RACING VEHICLE

      Marcellin, Michael; Boyer, Kyle; Brubaker, Laura; Everly, Kyle; Herriman, RIchard; Houston, Paul; Ruckle, Sean; Scobie, Rory; Ulanday, Ian; Univ Arizona (International Foundation for Telemetering, 2017-10)
      The University of Arizona Baja Racing Team competes annually in an intense off-road racing competition. This year’s car features a distributed sensor network capable of displaying useful data to the driver, the benefits and technical aspects of which are examined by this paper. Based on the ATmega2560 chip, the system is USB programmable, features hot-swappable batteries, and includes SMD components. Each sensor is custom designed, functions as an I2C slave, and contains its own ATtiny85 microcontroller allowing all the sensors to be addressable and enables them to be wired in parallel. The system also includes interrupts for almost every single sensor, which allows for more accurate data collection and guarantees that no important data will be missed. A custom-made board was created to connect these sensors and serve as a microcontroller data logger based on an Arduino reference design.
    • PERFORMANCE RESULTS USING DATA QUALITY ENCAPSULATION (DQE) AND BEST SOURCE SELECTION (BSS) IN AERONAUTICAL TELEMETRY ENVIRONMENTS

      Geoghegan, Mark; Schumacher, Robert; Quasonix (International Foundation for Telemetering, 2017-10)
      Flight test telemetry environments can be particularly challenging due to RF shadowing, interference, multipath propagation, antenna pattern variations, and large operating ranges. In cases where the link quality is unacceptable, applying multiple receiving assets to a single test article can significantly improve the overall link reliability. The process of combining multiple received streams into a single consolidated stream is called Best Source Selection (BSS). Recent developments in BSS technology include a description of the maximum likelihood detection approach for combining multiple bit sources, and an efficient protocol for providing the real-time data quality metrics necessary for optimal BSS performance. This approach is being standardized and will be included in Appendix 2G of IRIG-106-17. This paper describes the application of this technology and presents performance results obtained during flight testing.
    • Mobile Diagnostics for Personal Electrics Transportation Devices

      Prescott, Glenn; Gilchrist, Zachary A.; Univ Kansas, Electrical Engineering Design Laboratory (International Foundation for Telemetering, 2017-10)
      The ultimate purpose of this project was to improve on a new electric form of transportation. These methods of transportation have been gaining popularity for those who have relatively short commutes, and this project poises that group as the target audience. As a result of these trends and the practicality of small personal transportation, the design team made the purpose to attain usable real-world practicality and walking replacement ability. Other types of devices have been created before, however they usually have a short ride time and do not go much faster than the average walking speed. That being said, this design also uses telemetry to serve as a proof of concept that internal data can be sent to a receiver from a distant location. The end result was expected to be an enjoyable experience that gave a mobile diagnostics system.
    • IMPLEMENTATION OF DIGITAL SIGNAL PROCESSING WITH HIGH DATA RATE SENSORS FOR DATA COMPRESSION

      Noh, Seongmin; Yoo, Hoyoung; Korea Aerospace Research Institute; Chungnam National University (International Foundation for Telemetering, 2017-10)
      The onboard telemetry system of Korea Space Launch Vehicle-II (KSLV-II) acquires acoustic, vibration, and piezoelectric pressure sensors that require high data rate over several kilo samples per second, so the compression method is needed to expand link margin of telemetry system. This paper implements third-octave and FFT signal processing algorithms to reduce sensor data with high compression ratio depends on data acquisition requirements. The developed signal processing hardware module is composed of analog signal conditioning block and digital signal processing block on FPGA, and the digital block is fully implemented with dedicated hardware using HDL. For digital hardware implementation, multistage structure with ANSI standard octave filter bank is used for third-octave processing, and pipelined architecture is used for FFT. The performance of data acquisition and signal processing is evaluated and compared to the commercial data acquisition equipment.
    • MULTIHOP ROUTING OF TELEMETRY DATA IN DRONE SWARMS

      Rohrer, Justin P.; Pospischil, Alexis; Department of Computer Science, Naval Postgraduate School (International Foundation for Telemetering, 2017-10)
      In 2015, a group of Naval Postgraduate School (NPS) professors and students set the record for largest fixed-wing unmanned aerial vehicle (UAV) swarm flown at one time. The swarm had 50 vehicles flying simultaneously and successfully demonstrated distributed decision-making with all processing occurring on swarm vehicles rather than a centralized control station. Much of the decision-making is based on telemetry data that is continuously streamed from all the nodes. At that time all telemetry data was broadcast in a single-hop radio environment using 802.11 in AdHoc mode. In the future, drone swarm distribution and mobility patterns will necessitate multi-hop communications for this telemetry data. This paper models the network currently used by the NPS drone swarm as well as potential future topologies and evaluates candidate multihop routing protocols for this application.
    • Modeling and Simulation with Numbers!

      Guadiana, Juan; Baird, James; Tackill, Curtiss; Telemetronics Inc.; Blue Origin LLC. (International Foundation for Telemetering, 2017-10)
      Moore's Law predicts the trends in our technology very well and we have witnessed the relentless march of software solutions deep into the hardware domain. Link models are normally in the realm of scientific software packages like Mathematica, MatLab or Satellite Tool Kit. Here we apply Frii's Transmission equation to perform a link model with a common application like Numbers or Excel. Modeling a single link is easy and a staring antenna Array is modeled as many single links. Creating the model does require planning just as creating any software application does, but the "coding" is fairly straight forward. The results are stunning graphical plots. A simulation is created from the same spread sheet depicts the array's Graphics User Interface (GUI). Very low cost, an excellent way for students to learn to model and simulate their systems. The work serves as a good prototype to experiment with before investing in expensive software or software development. Spreadsheets do break easily so plan to back up your sheets periodically.
    • A SUMMARY OF DATA-AIDED EQUALIZER EXPERIMENTS AT EDWARDS AFB

      Rice, Michael; Hogstrom, Christopher; Nash, Chris; Ravert, Jeff; Saquib, Mohammad; Afran, Md. Shah; Cole-Rhodes, Arlene; Moazzami, Farzad; Perrins, Erik; Temple, Kip; Brigham Young University; University of Texas at Dallas; Morgan State University; University of Kansas; 412 Test Wing,Edwards AFB (International Foundation for Telemetering, 2017-10)
      This paper summarizes the analysis of bit error rate data captured during flight tests designed to compare data-aided equalizers with SOQPSK-TG to unequalized and currently available blind, adaptive equalizers with SOQPSK-TG. The number of bit errors,on a second-by-second basis, are analyzed. The results are different for each test point. Given the uncertain behavior of the preamble detector for the data-aided equalizer and the differing channel conditions between the data-aided equalizer channel and the conventional serial streaming telemetry channel, we are unable to draw any firm comparative conclusions.
    • AN EXPANDED COMMUNICATIONS SYSTEM FOR OFF-GRID TELEMETRY

      Marcellin, Michael; Boyer, Kyle; Brubaker, Laura; Everly, Kyle; Herriman, RIchard; Houston, Paul; Ruckle, Sean; Scobie, Rory; Ulanday, Ian (International Foundation for Telemetering, 2017-10)
      The drivers of the University of Arizona Baja racing team must be intensely focused on tackling the jumps, boulders, mud bogs, and other challenges in the four-hour endurance race. These obstacles are just as demanding on the vehicle as the driver, so the pit crew needs effective ways of detecting problems within the vehicle before serious damage occurs. Our solution is a wide range, AES encrypted, Wi-Fi communications system that supports full IP protocol and live video feed, allowing our telemetry data to be accessed through a smartphone via a web interface. To provide a wide range of communication options, our system supports VOX and push-to-talk audio compatible with third-party radios, and has an on-board HDMI screen for text-based communications. Finally, our system is backwards compatible with prior generations to make repairs and replacements easy.
    • AN INTERNET-BASED REMOTE COMMAND AND TELEMETRY SYSTEM FOR A MICROWAVE PROPAGATION STUDY

      Colapelle, Mario; Zamore, Brian; Kopp, Brian; Pierce, Randy; Univ N Florida, Elec Eng Dept; Florida Department of Transportation, Intelligent Transportation Systems Office (International Foundation for Telemetering, 2017-10)
      A research project investigating microwave radio frequency propagation in a 500 mile link across the Gulf of Mexico requires a remote-control process to command microcontroller-based devices including power control modules and antenna feedhorn positioners, and to telemeter system parameters back to the operators. The solution that was developed is a simple, webserver-based user-interface that can be accessed both locally and remotely via the internet. To interface the webservers with the microcontroller-based devices, a polling protocol, based on MODBUS, was developed that provides an efficient command and telemetry link over a serial RS-485 interface.
    • HIGH-G SURVIVABILITY OF AN UNPOTTED ON-BOARD RECORDER

      Granitzki, Richard F.; Weinhold, Douglas; US Army Armament Research Development and Engineering Center, Telemetry Branch (International Foundation for Telemetering, 2017-10)
      On-Board Recorders (OBRs) provide developers with data from sensors and computers by storing the data to memory devices contained within it’s on board electronics system. At the expense of recovery, reusable OBRs provide projects with cost savings in terms of upfront non-recurring engineering, unit costs savings, and reduced field support setups. In this paper, the ARRT-158 OBRs used within artillery munitions systems to capture interior and exterior ballistics sensor and mission computer data will be discussed.
    • A DISTRIBUTED VIDEO ACQUISITION SYSTEM

      Song, Jian; Beijing Zoweetech Ltd. (International Foundation for Telemetering, 2017-10)
      Camera has been used in telemetry system over decades now. Normally, the video signal outputted from cameras would be acquired by video module(s) located in general data acquisition equipment. In this paper, a distributed video acquisition system is presented. It is a synchronous acquisition system consisted of a record and control unit and several video acquisition units. The synchronous shutter control for cameras and data flow synchronous transportation inside the system is added as well. The accuracy of timing and synchronous acquisition of the system is less than 50ns.
    • AN UNBALANCED FEED DESIGN FOR WIDEBAND PHASED ARRAYS

      Landgren, David W.; Dykes, Daniel J.P.; Allen, Kenneth W.; Advanced Concepts Laboratory, Georgia Tech Research Institute, Georgia Institute of Technology (International Foundation for Telemetering, 2017-10)
      In this work, a planar phased array antenna was engineered with ultra-wideband (UWB) performance that covers portions of the L-, S-, and C-bands. The unit cell design contains a driven layer that is directly connected to a single coaxial feed and a parasitic layer located above the driven layer separated by free space. This design does not require a balun or any vias between the antenna ground plane and the driven layer, resulting in a simple antenna stack-up consisting of only planar layers, aside from the feed structure. As a consequence, the complexity, and potentially sensitivity to mechanical tolerances, is reduced. The simulated results of this unbalanced phased array are discussed and experimentally validated.
    • HIGH-PRECISION MOTION ESTIMATION SYSTEMS FOR UUV NAVIGATION

      Lee, Hua; Radzicki, Vincent; UCSB, Dept Electrical & Comp. Eng. (International Foundation for Telemetering, 2017-10)
      This paper is the summary of a sequence of research tasks in the area of 3D bearing-angle estimation for UUV homing and docking exercises. The main focus is to simplify the concept as well as computation efficiency of the homing and docking tasks, by elevating the estimation modality from the conventional twin-receiver configuration to the 2D circular arrays. The objective is to utilize the multi-element receiver array for the entire navigation procedure, including bearing-angle estimation, optimal path planning, and high-precision docking.
    • TRACKING INFORMATION IN SAR IMAGE FORMATION AND CLASSIFICATION ALGORITHMS

      Rajagopal, Abhejit; Radzicki, Vincent; Chandrasekaran, Shivkumar; Lee, Hua; UCSB, Dept Electrical & Comp. Eng. (International Foundation for Telemetering, 2017-10)
      Traditional target detection pipelines involve two sequential steps: the formation of a range-profile or likely-image, and the classification of likely targets within that image. Although it has been shown that target tracking in the RaDAR image-domain can be unnecessarily noisy, with more accurate and efficient implementations involving a direct analysis of the measured wavefield, image formation remains a desirable output in many applications due to its highly descriptive and interpretable nature. In this paper, we outline a mechanism for formalizing and accelerating this procedure in application-specific use cases. Enabled by recent advances in deep learning, we present a pipeline for automatically selecting an “optimal” filtered back-projection model, forming a likelyimage, and performing target recognition and classification. The architecture allows practitioners to track and optimize the flow of information throughout the pipeline, enabling applications that utilize only intermediate outputs of the algorithm.