• Low Cost Unmanned Aircraft System for Autonomous Flight and Computer Vision Tasks

      Marcellin, Michael W.; Hung, David; Allred, Coby; Univ Arizona, Dept Elect & Comp Engn (International Foundation for Telemetering, 2016-11)
      The Arizona Autonomous Vehicles Club is participating in the 2016 AUVSI Student Unmanned Aerial Systems Competition which offers various challenges to be completed by a fully autonomous aerial vehicle. To complete various mission objectives, a low cost, rotary-wing platform was developed and deployed. The vehicle was assembled and upgraded for autonomous capability using commercially available components and open sourced software.
    • AN IMPROVED METHOD FOR SYNCHRONIZING MULTIPLE TM FILES

      Terrien, Ron; Endress, William; Raytheon Missile Systems (International Foundation for Telemetering, 2016-11)
      In a previous paper “Merging Multiple Telemetry Files From Widely Separated Sources For Improved Data Integrity” presented at the 2012 ITC\USA conference, a method for synchronizing TM files at the minor frame level was presented. This paper expands on that work by describing a method for synchronizing the files at the minor frame level faster and at the earliest frame possible using an internal counter. This method is also useful if the minor frames fall out of sync due to large dropouts.
    • Spectrum Access R&D (SARD) Program: Conformal C-Band/Multi-band Antenna Project

      Kujiraoka, Scott; Fielder, Russell; Apalboym, Maxim (International Foundation for Telemetering, 2016-11)
      The Conformal C-Band/Multi-band Antenna project will support the AWS-3 auction by providing the technology to integrate C-Band or multi-band telemetry(TM) antennas on test articles such as missiles, weapons, or aircraft. These test articles would then provide C-Band or multi-band TM data to ground station receivers that are relocated to the C-Band frequency range through the AWS-3 Spectrum Relocation Fund program. This project would advance the technology of antennas in the C-Band region for test article TM integration. Successful use of C-Band and Multi-Band antennas for aeronautical mobile telemetry (AMT) on test and training ranges is dependent on the advancement of key technologies. This paper will detail the technology areas being matured by this project as well as the capabilities to be demonstrated.
    • Frequency Partition Techniques of FMCW Radar Imaging Systems for MIMO Multi-Static Array Modality

      Lee, Hua; Thornton, Matthew; University of California (International Foundation for Telemetering, 2016-11)
      The modalities of many imaging applications have been advancing toward the MIMO format for improved efficiency. This paper presents an approach to the implementation of the MIMO operating modality for FMCW radar imaging systems with multi-element data-acquisition arrays. The unique characteristics of the software-defined step-frequency FMCW imaging systems enable the simple and precise orthogonalization procedure through direct spectral partitioning. This paper includes the description of the data-acquisition hardware of an eighttransceiver radar imaging system, imaging formation algorithms, MIMO implementation, and results of laboratory experiments.
    • 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.
    • 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.
    • 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.
    • ENERGY EFFICIENT ADAPTIVE SECTOR-BASED USER CLUSTERING ALGORITHM FOR CELLULAR NETWORK

      Astatke, Yacob; Moazzami, Farzad; Woldegebreal, Dereje H.; Kassa, Hailu Belay; Aredo, Shenko Chura; Menta, Estifanos Yohannes; Morgan State University, Department of Electrical and Computer Engineering; Hawassa University, School of Electrical and Computer Engineering, Institute of Technology; Addis Ababa University, School of Electrical and Computer Engineering (International Foundation for Telemetering, 2016-11)
      In this paper, we propose an adaptive and multi-sector-based user clustering algorithm which increases energy efficiency in a cellular network. Adaptive sectoring with dynamically changing sector angles is illustrated with a number of randomly distributed mobile stations. Transmitted power is equally shared by sectors before adaptive user clustering. The sector angles vary from 30 to 360 degrees by merging neighboring sectors and a sector is switched off till the user density exceeds a threshold (Td). The Td value is computed from the total number of users that the cell can accommodate over the area of the cell. The sectors with less than Td density exhibits transmit power which approaches to zero or sleeping state and so that the cumulative power is saved. Simulation results show that an average of 45% to 50% energy can be saved in 10 iterations.
    • 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.
    • BLIND EQUALIZATION WITH LDPC CODE: TO QUASIERROR FREE TRANSMISSIONS IN TELEMETRY

      Blanc, Grégory; Skrzypczak, Alexandre; Pierozak, Jean-Guy; ZODIAC AEROSPACE; ZODIAC DATA SYSTEMS (International Foundation for Telemetering, 2016-11)
      In a telemetry system, it has been frequently proved that multipath channels and transmission noise are the most critical sources of distortion. While equalization allows a strong limitation of the multipath effects, the noise impact can be efficiently reduced if forward error correction is used. This paper proves that the combination of blind equalization and a powerful FEC like LDPC strongly improves bit error rates for the SOQPSK modulation. We also prove that a LDPC code is able to fully correct the residual errors that may persist at the equalizer output. In other terms, the combination of equalization and LDPC code enables quasi-error free transmissions in various channel scenarios that represent the various phases of a telemetry mission.
    • 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.
    • 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.
    • The Application of Machine Learning Techniques in Flight Test Applications

      Cooke, Alan; Melia, Thomas; Grayson, Siobhan; Curtiss-Wright; University College Dublin, Insight Centre for Data Analytics (International Foundation for Telemetering, 2016-11)
      This paper discusses the use of diagnostics based on machine learning (ML) within a flight test context. The paper begins by discussing some of the problems associated with instrumenting a test aircraft and how they could be ameliorated using ML-based diagnostics. We then describe a number of types of supervised ML algorithms which can be used in this context. In addition, key practical aspects of applying these algorithms, such as feature engineering and parameter selection, are also discussed. The paper then outlines a real-world application developed by Curtiss-Wright, called Machine Learning for Advanced System Diagnostics (MLASD). This description includes key challenges that were encountered during the development process and how suitable input features were identified. Real-world results are also presented. Finally, we suggest some further applications of ML techniques, in addition to describing other areas of development.
    • THE PERFORMANCE TEST OF AN INITIAL iNET-LIKE RF NETWORK USING A HELICOPTER

      Ito, Sei; Honda, Takeshi; Tanaka, Toshihisa; Aoyama, Daiki; Kawasaki Heavy Industries, Ltd. (International Foundation for Telemetering, 2016-11)
      Through the use of early iNET-prototype IP Transceiver technology, Kawasaki Heavy Industries, Ltd. (KHI) has been able to communicate with a flight test vehicle. This technology provides a two-way high-capacity communication that has not been achieved with conventional telemetry. KHI has been authorized to use S-band IP Transceivers since 2014 in Japan. Then various communication tests have been performed. Last year we presented the result of the performance test of initial iNET-like RF network using a tethered aerostat at ITC. As the next phase, we have a plan of the test using a helicopter. The test is going to be conducted in September. We will present the results at ITC. This paper describes plans of the test which includes improved data backfill techniques.
    • A CASE STUDY OF HIGH-VOLUME AUTOMATED TESTING WITHIN THE NASA SPACE NETWORK

      Irvin, Dana; Lokshin, Kirill; Puri, Amit; Ingenicomm, Inc. (International Foundation for Telemetering, 2016-11)
      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. SN sustainment activities frequently involve testing of the numerous interfaces within the SN ground segment. To reduce the cost and complexity of such testing, NASA commissioned the development of the External Bearer Interface Test Set (XBIT), which enables ground interface verification using a high-volume test automation framework. This paper considers the use of the XBIT as a case study of automated ground segment verification and validation. The paper discusses the trade-offs between automated, semiautomated, and interactive ground interface testing and presents comparative test execution metrics to quantify the relative efficiency of these approaches.
    • ROTARY-WING FLIGHT TESTS TO DETERMINE THE BENEFITS OF FREQUENCY AND SPATIAL DIVERSITY AT THE YUMA PROVING GROUND

      Diehl, Michael; Swain, Jason; Wilcox, Tab; Air Combat Systems Directorate (International Foundation for Telemetering, 2016-11)
      The United States (U.S.) Army Yuma Proving Ground (YPG) conducted a series of rotary-wing flight tests for the sole purpose of checking out Telemetry data link instrumentation. Four flights were conducted at YPG in February 2016 that built upon an earlier test flight conducted in June 2015. The most recent iteration of testing examined the benefits of frequency diversity on aircraft and the spatial diversity of receiving sites using existing hardware at YPG. Quantitative analysis from those flight results will be presented and include discussion on how results will affect future mission operations at YPG.
    • 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.
    • Noise Predictive Information Rate Estimation for TDMR Channels

      Bahrami, Mohsen; Vasic, Bane; Univ Arizona, Dept Elect & Comp Engn (International Foundation for Telemetering, 2016-11)
      In this paper, we use the forward recursion BCJR algorithm to estimate the symmetric information rate for Two Dimensional Magnetic Recording (TDMR) channels. In particular, we consider a TDMR read/write channel whose all components, including recording medium, write and readback processes are modeled in software. Since the primary source of noise in TDMR arises from irregularities in the recording medium and leads to highly colored and data-dependent jitter, the pattern dependent noise predictive (PDNP) algorithm is implemented to improve the accuracy and performance of SIR estimation. Furthermore, we study the performance gain of using the PDNP algorithm in SIR estimation through simulations over the Voronoi based media model for different TDMR channel configurations.
    • 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.
    • TELEMETRY SYSTEM FOR REALTIME MONITORING OF AN OFFROAD RACECAR

      Marcellin, Michael; Boyer, Kyle; Brubaker, Laura; Everly, Kyle; Herriman, RIchard; Sackett, Mark; Tran, Huy; Univ Arizona, Dept Elect & Comp Engn (International Foundation for Telemetering, 2016-11)
      The University of Arizona Baja racing team competes annually in a grueling fourhour offroad endurance race which subjects vehicles to an array of obstacles such as jumps, boulders, and mud bogs. This paper examines the telemetering system created by the UA Baja Team to monitor a range of critical aspects of the car with the goal of detecting and identifying possible mechanical failures and areas with potential for improvement. Running on an Arduino Mega, the system stores all gathered data to an SD card and transmits it back to the pit wirelessly for realtime analysis.