• SIMPLIFYING FLIGHT TEST CONFIGURATION WITH CONSTRAINTS

      Noonan, Patrick J.; Ibaroudene, Hakima; Whittington, Austin J.; Moodie, Myron L.; Southwest Research Institute (International Foundation for Telemetering, 2016-11)
      Configuring flight test systems can be a complex process due to the large number of choices that must be made. Making these choices requires system knowledge to build a working configuration in an efficient and timely manner. Historically, flight test systems have embedded this system knowledge in code. The limitation with these approaches is that any change or addition to the system knowledge is costly due to the significant work required to update and maintain the software. We see the philosophy of constraints as a promising path toward addressing these issues. In the context of flight test configuration, a set of constraints defines the limits of how a system may be configured to perform specific tasks. This paper describes an approach for simplifying configuration by moving the system knowledge out of hardcoded business rules and into a flexible architecture that leverages constraints for validation of system configurations.
    • WAVEFIELD-BASED MOTION ESTIMATION FOR RADAR AND SONAR ARRAY SYSTEMS

      Lee, Hua; Radzicki, Vincent R.; University of California, Department of Electrical and Computer Engineering (International Foundation for Telemetering, 2016-11)
      This paper introduces a generalized and computationally efficient approach for the estimation of target motion parameters from received wavefield data collected from coherent sensing systems such as radar and sonar measurement arrays. The mathematical content of the algorithm is described, along with the general processing procedure to perform on recorded data. The algorithm presents a solution to the joint estimation of translational motion and periodic motion of targets, which has many practical applications for sensing and detection tasks. Experimental and simulation results are included supporting the effectiveness of the method.
    • OFDM AND SOQPSK TRANSCEIVER HARDWARE IMPLEMENTATION WITH PRELIMINARY RESULTS

      Wang, Enkuang D.; Brothers, Timothy J.; Georgia Tech Research Institute (International Foundation for Telemetering, 2016-11)
      This paper presents a hardware implementation of a transceiver capable of both orthogonal frequency-division multiplexing (OFDM) and shaped-offset quadrature phase shift keying (SOQPSK) transmissions using a dataflow programming language. Based on the physical layer iNET standard, we introduce a transceiver implementation that utilizes both waveforms with low density parity check (LDPC) forward error correction (FEC) codes. This testbed is intended to test and enable an adaptive algorithm that uses both waveforms as its modulation schemes. As such, it has the ability to dynamically select various modulation parameters and coding rates. The hardware implementations are described and performance utilizations are presented.
    • LOCATING AND REMOVING A PREAMBLE/ASM SEQUENCE IN AERONAUTICAL TELEMETRY

      Rice, Michael; Hogstrom, Christopher; Nash, Christopher; Brigham Young University (International Foundation for Telemetering, 2016-11)
      This paper describes how to locate and remove periodically inserted preamble and ASM bit fields in the presence of the phase ambiguity caused by decision-directed PLLs used in most telemetry demodulators. The phase ambiguity is resolved by correlating rotated or delayed versions of the data with a stored template of the preamble and ASM bits. A finite state machine in conjunction with a FIFO is used to remove the preamble and ASM bits from the output bit stream.
    • AUTOMATIC MODULATION RECOGNITION FOR CPM

      Rice, Michael; Nash, Christopher; Brigham Young University (International Foundation for Telemetering, 2016-11)
      This paper uses detection and estimation theory techniques for automatic modulation recognition of CPM signals. The CPM signals of interest are PCM/FM, SOQPSK-TG, and ARTM/CPM. The modulation recognition problem is formulated as a hypothesis test with the test statistic computed using samples of the observed signal. Using such techniques, simulation results show that correct modulation can be achieved error free at a carrier-to-noise ratio of 19 dB for PCM/FM, 50 dB for SOQPSK-TG, and 25 dB for ARTM CPM.
    • ON FREQUENCY OFFSET COMPENSATION FOR EQUALIZED SOQPSK

      Rice, Michael; Ravert, Jeffrey; Brigham Young University (International Foundation for Telemetering, 2016-11)
      This paper describes the use of a phase lock loop (PLL) to compensate for and remove a residual frequency offset when using data-aided estimators to equalize SOQPSK-TG. The problems of multipath and residual frequency offset will be shown my example. An equalizer followed by a PLL will be shown to be a viable option to mitigate multipath and residual frequency offset by example.
    • SPARSE CHANNEL ESTIMATION FOR AERONAUTICAL TELEMETRY

      Rice, Michael; Hogstrom, Christopher; Brigham Young University (International Foundation for Telemetering, 2016-11)
      This paper applies a compressed sensing (CS) algorithm to SOQPSK-TG waveform samples to reconstruct a sparse channel. The mean squared error (MSE) is computed between the estimated channel and the true channel. The estimated channel is then used in an equalized system and a bit error rate (BER) curve is calculated. The results are then compared to a Maximum Likelihood (ML) estimator. The CS estimate does not produce significant gains but it doesn’t break anything either.
    • FUSION-BASED AND FLICKER-FREE DEFOGGING

      Guo, Jing-Ming; Syue, Jin-Yu; Radzicki, Vincent; Lee, Hua; National Taiwan University of Science and Technology, Department of Electrical Engineering; University of California, Department of Electrical and Computer Engineering (International Foundation for Telemetering, 2016-11)
      Degradation in visibility is often introduced to images captured in poor weather conditions, such as fog or haze. In this paper, a fusion-based transmission estimation method is introduced to adaptively combine two different transmission models. Specifically, the new fusion weighting scheme and the atmospheric light computed from the Gaussian-based dark channel method improves the estimation of the locations of the light sources. To reduce the flickering effect introduced during the process of frame-based dehazing, a flicker-free module is formulated to alleviate the impacts. The system assessments show this approach is capable of superior defogging and dehazing performance, compared to the state-of-the-art methods, both quantitatively and qualitatively
    • Unsupervised Segmentation and Labeling for Smartphone Acquired Gait Data

      Martinez, Matthew; De Leon, Phillip L.; New Mexico State University, Klipsch School of Elec. & Comp. Eng.; Sandia National Laboratories (International Foundation for Telemetering, 2016-11)
      As the population ages, prediction of falls risk is becoming an increasingly important research area. Due to built-in inertial sensors and ubiquity, smartphones provide an at- tractive data collection and computing platform for falls risk prediction and continuous gait monitoring. One challenge in continuous gait monitoring is that signi cant signal variability exists between individuals with a high falls risk and those with low-risk. This variability increases the di cultly in building a universal system which segments and labels changes in signal state. This paper presents a method which uses unsu- pervised learning techniques to automatically segment a gait signal by computing the dissimilarity between two consecutive windows of data, applying an adaptive threshold algorithm to detect changes in signal state, and using a rule-based gait recognition al- gorithm to label the data. Using inertial data,the segmentation algorithm is compared against manually segmented data and is capable of achieving recognition rates greater than 71.8%.
    • PARAMETER ESTIMATION IN AN LED-CAMERA VISIBLE LIGHT COMMUNICATION SYSTEM

      Borah, Deva K.; Curry, Elam; New Mexico State University (International Foundation for Telemetering, 2016-11)
      Visible light communication (VLC) is emerging as a complementary technology to radio frequency communication. Some of the benefits of VLC include reusable bandwidth, security and high potential data rates. VLC can also be used in user positioning. For both communication and positioning systems, knowledge of the VLC channel parameters is usually needed. This paper investigates the estimation of the light-emitting diode (LED) parameters and user positions. The performance of the proposed estimation technique is numerically studied. Cram´er Rao lower bound (CRLB) results are derived and compared with the results obtained from the proposed maximum likelihood estimator. The effect of channel estimation on overall communication performance in terms of symbol error rate (SER) is also studied. The SER results using the estimated channel closely match with known channel results.
    • AN INITIAL LOOK AT ADJACENT BAND INTERFERENCE BETWEEN AERONAUTICAL MOBILE TELEMETRY AND LONG-TERM EVOLUTION WIRELESS SERVICE

      Temple, Kip; Air Force Test Center (International Foundation for Telemetering, 2016-11)
      With National Telecommunications & Information Administration (NTIA) Advanced Wireless Services (AWS-3) auction of frequencies in the 1695-1710 MHz, 1755-1780MHz, and 2155- 2180MHz bands, users of the Aeronautical Mobile Telemetry (AMT) band from 1755- 1850MHz, known as Upper L-Band, could be greatly affected. This paper takes an initial look at how the 1755-1780MHz band will be used by the cellular carriers and presents some preliminary testing results of adjacent channel (band) interference that could be experienced by AMT users. This paper should be considered as the stepping off point for future interference discussions, required analysis, and further testing.
    • NEW APPROACHES TO THE IMPLEMENTATION OF EMBEDDED TELEMETRY PROCESSING SYSTEMS

      Eckman, Bill; Irvin, Dana; Lokshin, Kirill; Puri, Amit; Ingenicomm Inc. (International Foundation for Telemetering, 2016-11)
      The conventional architecture of modern telemetry and signal processing systems typically relies on some combination of specialized hardware and firmware components integrated with commercial rackmount computer platforms running off-the-shelf operating systems. The evolution of the modern system-on-a-chip (SoC) architecture, which tightly couples traditional field-programmable gate array (FPGA) elements with high-performance embedded microprocessor cores, offers an alternative to this conventional approach. When effectively utilized, the SoC approach can provide several advantages, including reduced system size and power, increased system security, and lower lifetime operating costs. This paper discusses the benefits offered by embedded SoC architectures for the implementation of satellite telemetry processing systems, and presents an example design that demonstrates advantages with respect to security, reliability, maintainability, footprint, and cost.
    • DISTRIBUTED COMPUTING PROCESSOR FOR SIGNAL PROCESSING APPLICATIONS

      Peterson, Krystal; Richter, Samuel; Schafer, Adam; Grant, Steve; Kosbar, Kurt; Missouri University of Science and Technology, Department of Electrical and Computer Engineering (International Foundation for Telemetering, 2016-11)
      Many signal processing, data analysis and graphical user interface algorithms are computationally intensive. This paper investigates a method of off-loading some of the calculations to remotely located processors. Inexpensive, commercial off the shelf processors are used to perform operations such as fast Fourier transforms and other numerically intensive algorithms. The data is passed to the processors, and results collected, using conventional network interfaces such as TCP/IP. This allows the processors to be located at any location, and also allows potentially large caches of processors to be shared between multiple applications.
    • HOW TO MAKE A RUGGEDIZED SSD

      Budd, Chris; SMART High Reliability Solutions (International Foundation for Telemetering, 2016-11)
      SSDs are now commonplace in all types of computing from consumer laptops to enterprise storage systems. However, most of those SSDs would not survive in environments with extreme temperatures or high shock and vibration such as found in embedded and military systems. The problems in this space are more than just mechanical; they involve all aspects of the design including electrical and even firmware. A combination of all three engineering disciplines is needed to provide a robust ruggedized SSD product.
    • MULTI-SENSOR HEALTH PLATFORM WITH CLOUD ANALYSIS

      Saha, Dola; Doddapaneni, Purna; Wofford, Quincy; Maneth, Nicole; University of Kansas, Information and Telecommunication Technology Center (International Foundation for Telemetering, 2016-11)
      What could we learn from monitoring our body processes with various portable sensors and an unconstrained analysis platform? Physiological processes in the human body produce observable biosignals. These signals contain a wealth of information about the condition of the body, and its reaction to environmental factors. Our study harnesses 9 unique sensors, integrated by the eHealthSensor platform for Arduino, to transmit data to an Android device. The Android device contains a local PostgreSQL database, which synchronizes with the cloud. Using this platform, researchers can monitor a subjects biosignals as they ride a roller coaster or participate in exercise activities. Nurses can monitor the vitals of multiple patients remotely. Analytic, cloud based services, managed by healthcare providers, could ultimately enable automated diagnosis of medical conditions.
    • ANTENNA RADIATION PATTERN CONTROL BASED ON 3D PRINTED DESIGN

      Xin, Hao; Abdelrahman, Ahmed H.; Yu, Xiaoju; Liang, Min; Wu, Junqiang; Univ Arizona, Dept Elect & Comp Engn (International Foundation for Telemetering, 2016-11)
      Dielectric materials have been applied in modifying the antenna radiation pattern, but it is usually limited to single-beam applications. The goal of this paper is to present a novel methodology to control the antenna radiation pattern based on 3D printing technology. 3D printing enables arbitrary dielectric distribution at different locations. As a result, different radiation patterns can be realized by loading an optimized dielectric material with varied permittivity. In this work, we propose a design of a quarter-wavelength monopole antenna surrounded by a low-profile 3D-printed polymer structure with an optimized dielectric distribution. Unlike the conventional omnidirectional pattern of the monopole antenna, singlebeam and multiple-beam patterns are achieved using genetic algorithm (GA) optimization.
    • A LESSON IN CONFLICT MITIGATION: INTEGRATING DIVERGENT DESIGN PHILOSOPHIES

      Kosbar, Kurt; Mormile, Melanie; Brinker, Katelyn R.; Marcolina, Rebecca C.; Missouri University of Science and Technology (International Foundation for Telemetering, 2016-11)
      The Mars Rover Design Team is dedicated to building a next generation rover that will one day assist astronauts in the field. The complexity of such a project increases when the two conflicting design philosophies of agile software development and traditional waterfall development must work in tandem in order to design and construct a rover within a year. Agile software development promotes the flexible, testdriven production of coinciding design aspects, while the waterfall design philosophy relies on thorough planning and rigid, sequential design schedules. The project managers of the team work to balance these opposing philosophies by fostering individual interests, allowing team members to select their own focus areas within a wide variety of mission critical tasks. This practice accelerates the design and construction of the rover and in turn creates the momentum needed to achieve a common goal while consolidating both agile software and traditional waterfall development.
    • OPTIMIZATION OF SYMBOL DISTANCE METRIC IN DIRECTIONAL MODULATION SYSTEMS

      Borah, Deva K.; Christopher, Ryan M.; New Mexico State University, Department of Electrical and Computer Engineering (International Foundation for Telemetering, 2016-11)
      This paper investigates a directional modulation (DM) method that distorts the received symbol constellations along a set of undesired directions while maintaining an undistorted constellation in the direction of intended communications. The problem is formulated in terms of minimization of the symbol distance metrics along the undesired directions. An algorithm assigns a symbol pair to each undesired direction for symbol distance minimization. Constraints for good reception in the desired direction are also included. The method involves iterations between a quadratic minimization problem and an unbalanced transportation problem. Numerical results are presented to show the bit error rate (BER) benefits of the proposed method.
    • CMA BLIND EQUALIZER FOR AERONAUTICAL TELEMETRY

      Xingwen, Ding; Wantao, Zhai; Hongyu, Chang; Ming, Chen; Beijing Research Institute of Telemetry (International Foundation for Telemetering, 2016-11)
      In aeronautical telemetry, the multipath interference usually causes significant performance degradation. As the bit rate of telemetry systems increases, the impairments of multipath interference are more serious. The constant modulus algorithm (CMA) blind equalizer is effective to mitigate the impairments of multipath interference. The CMA adapts the equalizer coefficients to minimize the deviation of the signal envelope from a constant level. This paper presents the performances of the CMA blind equalizer applied for PCM-FM, PCM-BPSK, SOQPSK-TG and ARTM CPM in aeronautical telemetry.
    • AUTONOMOUS MAPPING

      Marcellin, Michael W.; Deputy, Xander; Fox, Kevin; Meyer, Christopher; Mitts, Cody; Wang, Jiaxiang; Univ Arizona, Dept Elect & Comp Engn (International Foundation for Telemetering, 2016-11)
      This paper describes an autonomous platform that can map an indoor single-floor environment in two spatial dimensions. The design uses the Simultaneous, Localization, and Mapping (SLAM) algorithm, which utilizes inertial measurement unit (IMU), microcontroller unit (MCU), and a 360-degree laser scanner to autonomously maneuver and generate a building floor plan accessible by the user.