• Design of Airborne Real-time Monitoring System for Vibration Signal of Large Civil Aircraft

      Jiayi, Liang; COMAC Flight Test Center, Instrumentation Dept (International Foundation for Telemetering, 2019-10)
      The high frequency vibration signal can effectively reflect the structural strength of aircraft during flight test. In order to meet the need of real-time monitoring of vibration parameters of a large civil airliner, an airborne real-time monitoring system for vibration signals is designed and developed. Development of airborne real-time monitoring software for high-frequency signals was based on C#. The software received and analyzed the network data of the airborne acquisition system, processed the time domain signals by FFT and power spectrum transformation, and realized the graphical display. The software can provide a strong support for the monitoring person to know the status of the aircraft in time.
    • DATA COLLECTION AND ANALYSIS TECHNIQUES FOR SOLAR CAR TELEMETRY DATA

      Rouse, Michael; Sauer, Miranda; Kosbar, Kurt; Missouri University of Science and Technology, Dept Electrical and Computer Engineering (International Foundation for Telemetering, 2019-10)
      Data collected from a solar car is monitored in real-time, which allows for intelligent decision making, efficient debugging, and high-quality testing for solar car teams. This paper compares three databases (MySQL, PostgreSQL, and MongoDB) to determine the optimal database system that should be used at solar car competitions. Each database system was tested using simulated solar car data to measure read and write speeds, and quality of performance on a low-power computer. Data were analyzed and displayed with custom interfaces to improve the user experience at solar car competitions.
    • A SYSTEMS ENGINEERING APPROACH TO MASTER MEASURAND LISTS AND THEIR METADATA

      Wells, Billy W., Jr.; Northrop Grumman, Corp. (International Foundation for Telemetering, 2019-10)
      A systems engineering approach to master measurand lists allows the use of metadata to improve data organization and management. As data acquisition systems become more complex, the management of sensors and their measurands must also advance. Traditional tabulated measurand lists of several hundred measurands are typically generated from email or verbal requests. Modern data acquisition systems with thousands of measurands are more complex than ever, causing these tabulated spreadsheets to become unwieldy and unmanageable. Modern data structures can easily organize and archive these lists through measurand metadata. By aligning the requirements of the measurand database with data acquisition system requirements, designers can ensure their data acquisition system is within constraints such as bandwidth, storage capacity, power consumption, size, and weight.
    • LTE-BASED AERONAUTICAL MOBILE TELEMETRY - LAB AND FIELD TEST EXPERIMENTS

      Beck, Eric; Erramilli, Shobha; Habiby, Sarry; Johnson, William; Kogiantis, Achilles; Maung, Nan; Rege, Kiran; Sayeed, Zulfiquar; Triolo, Anthony; Young, Jeffrey; et al. (International Foundation for Telemetering, 2019-10)
      Aeronautical mobile telemetry (AMT) based on 3GPP’s LTE standard is implemented in a proof-of-concept system. The solution tackles the very high Doppler shifts expected in flight tests using an appliqué that can be inserted between the transmit/receive ports of the Test Article (TA) and the antennas. This appliqué estimates the Doppler shift and proactively compensates for it on the uplink signal being transmitted by the TA. The overall system has been tested under different operational conditions in a laboratory setup as well as in the field. In the laboratory setup, the desired operating conditions are created with a set of Software-Defined-Radio-based channel emulators coupled with a computer to control their behavior. In order to carry out field tests, an operational LTE network has been created at Edwards Air Force Base (EAFB) with two base stations, backhaul links, and a core network. In this paper, we provide descriptions of both laboratory and field test setups as well as the results of several tests that have been carried out to date. The results of lab and field tests lend strong support to the viability of this AMT solution.
    • DESIGN AND RESEARCH OF REAL-TIME MONITORING PROGRAM DEVELOPMENT SYSTEM FOR CIVIL AIRCRAFT FLIGHT TEST DATA BASED ON WPF

      Mao, Wei; Feng, Can; Liu, Tao; Wang, Feng; Liang, Jiayi; Flight Test Center of the COMAC, Instrumentation Dept (International Foundation for Telemetering, 2019-10)
      The real-time monitoring program offlight test data is an indispensable and important supporting tool in the flight test of large civil aircraft. With the continuous deepening of the networked test system, a large number of complex flight test parameters pose a huge challenge for the development of monitoring programs. Based on the WPF platform, this paper uses XAML files, reflection and DataBinding to design a system for developing real-time monitoring programs for flight test data. The system realizes the rapid integration and management of the monitoring program by dragging and displaying the control, shortening the preparation cycle in the past few weeks to several hours; when the system is running, the three-layer architecture can drive hundreds of monitoring terminals in real time, which is the domestic large-scale passenger aircraft C919 aircraft. The first flight and forensic flight test provided technical support.
    • WHY ARE WE HATIN’ ON ARTM CPM?

      Temple, Kip; Air Force Test Center, Edwards AFB (International Foundation for Telemetering, 2019-10)
      Why hasn’t the Aeronautical Mobile Telemetry community adopted IRIG 106 compliant ARTM CPM as their preferred waveform for the transmission of telemetry data? Telemetry receivers in the market place today exhibit gains in detection efficiency and resynchronization speed that far exceed products of just a few years ago. Past papers have shown the link performance comparison between the new waveform standard SOQPSK-TG and ARTM CPM has narrowed since ARTM CPM was first standardized. This paper will present the latest performance comparison between these two waveforms during a controlled test throughout various flight conditions. The testing is presented and performance comparisons are made between the waveforms. This comparison will use traditional methods combined with several new performance metrics presented in this paper. To conclude, Link Availability, the measure of overall link performance is presented illustrating how closely these waveforms perform.
    • CHANNEL ESTIMATION USING GAUSSIAN PROCESS REGRESSION

      Kim, Taejoon; Perrins, Erik; Simeon, Richard; Univ Kansas, Dept Electrical Engineering and Computer Science (International Foundation for Telemetering, 2019-10)
      Gaussian process (GP) regression can be used in the interpolation of observed periodic channel estimates in OFDM transmission systems over both time and frequency in small-scale fading environments. Previous GP regression studies used the popular radial basis function as the GP kernel. In this study, we examine the performance of GP regression using a Bessel kernel with a semi-static hyperparameter vector. Results show that GP regression using the Bessel kernel outperforms the radial basis kernel, as well as traditional interpolation methods such as cubic spline and FIR interpolation, especially when training symbols are spaced far apart in time with respect to the channel coherence time.
    • CONTROL FAILURES IN AN UNMANNED AERIAL SYSTEM AND THE POTENTIAL FOR STATELESS CONTROL

      Marcellin, Michael; Norland, Kyle; Univ Arizona, Dept Electrical and Computer Engineering (International Foundation for Telemetering, 2019-10)
      To participate in the 2019 SUAS competition, an Unmanned Aerial System (UAS), was built. Unfortunately, several critical failures occurred, including an unwanted circling behavior, and an unnecessary self-crash. The analysis of both behaviors revealed surface level errors in the scripts and devices that were used, but also a deeper flaw in the architecture of state based behaviors and conditional state transitions. To address these failures, an alternative architecture based around stateless controls was designed and tested. It successfully resolved the issues, and seems to hold promise as an alternative control system architecture, especially in non-linear environments.
    • ANALYSIS OF INERTIAL MEASUREMENT DATA FROM A MODEL ROCKET PAYLOAD

      Long, David G.; Francis, Benjamin; Brigham Young University, Dept Electrical and Computer Engineering (International Foundation for Telemetering, 2019-10)
      As part of a student-educational experience in telemetry, beginning undergraduates build, program, and test small payloads flown in model rockets. These payloads, nicknamed “femtosats,” collect and transmit real time telemetry on the rocket’s performance. The femtosats measure the inertial motions of the model rocket, providing info to extract the flight path. The individually student-designed femtosat circuit board includes a simple inertial measurement sensor that collects acceleration data in the form of x, y, z acceleration vectors which are transmitted in real-time to a radio ground station. The focus of this paper is the collection and analysis of the data from the telemetered inertial measurement sensor and how it can be interpreted and applied in simple model rocket motion analysis.
    • AN INTRODUCTION TO IRIG-106-17 FEATURES AND ASSOCIATED COMMAND STRUCTURES

      Cook, Paul; Curtiss-Wright, Aerospace Instrumentation (International Foundation for Telemetering, 2019-10)
      The RCC Telemetry group publishes various documents and IRIG-106 aims to standardize telemetry solutions. Such efforts help to ensure that ranges - and other flight test users - have access to a range of interoperable equipment. The standard is updated every two years with the latest version being IRIG-106-17. The release of IRIG-106-17 means flight test engineers now have a new list of transmitter performance features to understand and to track during the daily operations. This paper provides an overview of these new features as well as the associated command structure as published in the standard.
    • LIDAR COLLISION AVOIDANCE SYSTEM WITH AUDIO FEEDBACK FOR VISUALLY IMPARIED INDIVIDUALS

      Lee, Hua; Maravilla, Julian; Shimada, Haruka; Univ California Santa Barbara, Dept Electrical and Computer Engineering (International Foundation for Telemetering, 2019-10)
      In this paper, we present the 4th-generation, light-weight low-power collision avoidance system. For this new version, the ultrasound transmitter of the data-acquisition component is replaced by a Lidar to avoid multi-paths in complex environments. The estimate of the target range is quantized into a frequency bin and represented by acoustic waveforms within the human hearing range. The bearing angle of the target is utilized to produce the temporal offset between the twin channels of the corresponding acoustic waveforms. This wearable and hearable device is designed for real-time navigation for the blind.
    • AN ENGINEER’S GUIDE TO CHAPTER 7 PACKET TELEMETRY TRANSPORT

      Hoffman, Richard W.; GDP Space Systems (International Foundation for Telemetering, 2019-10)
      Chapter 7 of IRIG106-17 defines the means of encapsulating packetized data within a PCM telemetry stream, ostensibly for transport from a platform to a processing location, via that platform’s conventional means of PCM transmission. While providing a mechanism for bridging platforms via the telemetry stream, a myriad of use-cases evolve, adding varying degrees of complexity to an implementation. Understanding these use-cases, their challenges, and some of the potential solution methodologies helps to determine the best implementation for a given mission. This paper seeks to present some of these aforementioned points, some obvious, and others uncovered over the course of working with solutions-seekers, in an effort to help cultivate and shape the growing demand for packet telemetry transport bridging.
    • DECORRELATION DEEP LEARNING FOR FINGERPRINT-BASED INDOOR LOCALIZATION

      Kim, Taejoon; Perrins, Erik; Xiong, Guojun; Univ Kansas, Dept Electrical Engineering and Computer Science (International Foundation for Telemetering, 2019-10)
      Indoor localization is of particular interest due to its immense practical applications. However, the rich multipath and high penetration loss of indoor wireless signal propagation make this task arduous. Though recently studied fingerprint-based techniques can handle the multipath effects, the sensitivity of the localization performance to channel fluctuation is a drawback. To address the latter challenge, we adopt an artificial multi-layer neural network (MNN) to learn the complex channel impulse responses (CIRs) as fingerprint measurements. However, the performance of the location classification using MNN critically depends on the correlation among the training data. Therefore, we design two different decorrelation filters that preprocess the training data for discriminative learning. The first one is a linear whitening filter combined with the principal component analysis (PCA), which forces the covariance matrix of different feature dimensions to be identity. The other filter is a nonlinear quantizer that is optimized to minimize the distortion incurred by the quantization. Numerical results using indoor channel models illustrate the significant improvement of the proposed decorrelation MNN (DMNN) compared to other benchmarks.
    • TELEMETRY ON WILDCAT FORMULA RACING VEHICLE

      Marcellin, Michael; Tan, Nicolas; Univ Arizona, Wildcat Formula Racing (International Foundation for Telemetering, 2019-10)
      The Wildcat Formula Racing Team of the University of Arizona participates in an annual engineering design competition where students compete with small formula-style racing cars. One of the challenges we face is to provide justification of our design choices to the judges. To establish means of collecting data used as evidence and analysis, we use a mixture of automotive sensors and electronic sensors to be transmitted onto an external microcontroller, an Arduino. The data will then be stored locally and broadcasted from the vehicle to the pit with a transceiver module for post-race data analysis, as well as feedback for the team.
    • REMOTE HEART MONITORING VIA MEDICAL TELEMETRY

      Lee, Hua; Radzicki, Vincent R.; Rajagopal, Abhejit; Univ California Santa Barbara, Dept Electrical and Computer Engineering (International Foundation for Telemetering, 2019-10)
      Today, a wide range of heart conditions can be monitored remotely with relatively inexpensive passive sensing technologies, enabling the potential for long-term monitoring and prognosis of patient state under representative environmental stimuli. A medical telemetry system that can incorporate such passive measurements and provide key diagnostic information to medical professionals would provide tremendous value to patients via quantitative and personalized healthcare. This paper presents an overview of passive sensing methods that could be utilized in a medical telemetry system for remote heart monitoring of patients. While active systems are another attractive option, they impose additional constraints on the system that require careful calibration, expert control, and more complex instrumentation. The methods presented here are based on low-cost, sensor technology with the potential to greatly improve long-term non-invasive, heart-health monitoring.
    • TELEOPERATED ROBOTIC ARMS WITH OPEN AND CLOSED LOOP CONTROL SYSTEMS

      Kosbar, Kurt; Verbrugge, Eli; Dahlman, Brian; Missouri University of Science and Technology (International Foundation for Telemetering, 2019-10)
      This paper examines the usage of telemetry for the six degrees of freedom robotic arm designed to compete on a mars rover in the 2019 University Rover Challenge. The arm utilizes three microcontrollers to receive control commands and translates them directly to motor signals for the six brushed DC motors. The usage of the 32-bit microcontrollers facilitates inverse kinematics, an intuitive process that allows commands to be sent as 3D coordinates to the arm, ensuring fine control for arm manipulation. Telemetry is transmitted from the rover to a remote base station over a 900 MHz RF link, using two omnidirectional cloverleaf antennas. Communication between the embedded systems is achieved with the ethernet User Datagram Protocol standard. This ensures seamless transferal of commands from the driver’s joystick to the arm, and a stream of telemetry containing motor currents, positional values, and limit switch states - a necessity for the open and closed loop control systems.
    • SOFTWARE CONVERSION OF LEGACY RECORDING FORMAT TO IRIG 106 CHAPTER 10 FILE

      Graham, Richard A., Jr.; Shepherd, Steven G.; US Navy, NSWC Corona (International Foundation for Telemetering, 2019-10)
      This paper examines how to convert files recorded on a legacy recorder to an IRIG 106 Chapter 10 file.
    • DFT-BASED FREQUENCY OFFSET ESTIMATORS FOR 16-APSK

      Rice, Michael; Redd, Bryan; Ebert, Jamison; Twitchell, Autumn; Brigham Young University, Dept Electrical and Computer Engineering (International Foundation for Telemetering, 2019-10)
      In this paper, we analyze several DFT-based frequency offset estimators for use with the 16-APSK digital modulation scheme. Even a small frequency offset between radio transmitters and receivers can cause phase information to be lost, so a system to align the phases is required to reliably demodulate PSK signals. These estimators have been adapted for 16-APSK from methods originally intended for use with QPSK and CPM. These methods consist of a coarse search and a fine search with an optional dichotomous search to improve accuracy. We analyze the estimator error variance and bit error rate associated with several methods of frequency estimation. These estimators exhibit small estimate error and variance and can provide bit error rates close to the ideal AWGN BER.
    • HIGH SPIN 105MM ARMAMENT OBR TECHNICAL PAPER

      Rotundo, Alfred; US Army - Army Futures Command; CCDC - Armament Center - Precision Munition Instrumentation Division (International Foundation for Telemetering, 2019-10)
      Developed an on-board-recorder (OBR) to capture both in-bore acceleration and in-flight canister expulsion forces for an artillery projectile. The instrumentation recorded on the OBR was fed into a model to simulate these forces. The OBR’s space claim was limited to the expulsion cavity of the artillery projectile. The OBR was equipped with an analog sensor suite that recorded battery, expulsion pressure, high-g in-bore axial accelerometer data, and radial spin data. Utilizing 8 channels of the ADC on the DSP, the sensors are recorded into both volatile SRAM and NOR Flash memory. The OBR matched both weight and center of gravity of the tactical artillery round. To accomplish this, multiple housing materials and potting materials were utilized. The OBR survived multiple shots. The OBR was instrumented successfully on 4 rounds, allowing an accurate model and simulation to be created to increase design reliability and minimize failures on future designs
    • ON CARRIER FREQUENCY AND PHASE SYNCHRONIZATION FOR CODED 16-APSK IN AERONAUTICAL MOBILE TELEMETRY

      Rice, Michael; Redd, Bryan; Briceno, Ximena; Brigham Young University, Dept Electrical and Computer Engineering (International Foundation for Telemetering, 2019-10)
      This paper examines the problem of carrier phase and frequency estimation for coded 16-APSK in aeronautical mobile telemetry. Given the fact that coded systems tend to operate at lower signalto-noise ratios than uncoded systems, the synchronizer must operate at these lower signal-to-noise ratios. For a 30 kHz frequency offset and a 10 Mbit/s 16-APSK signal, the conventional phase lock loop (PLL) system does not achieve consistent lock to be a useful approach. Consequently, a blind feed-forward approach, based on the FFT, and an initialized feedback approach based on the PLL were examined. The feed-forward estimator is capable of achieving BER ideal performance for Eb/N0 ≥ 6 dB using 1024 symbols. The feedback estimator, initialized using a feed-forward estimate based on 1024 symbols is also capable of achieving BER ideal performance for Eb/N0 ≥ 6 dB. Both synchronizers require a sufficiently good blind estimate: the estimate based on 2014 symbols appears to be the minimum value to achieve good performance.