• 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.
    • 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.
    • DESIGN OF PROBING WAVEFORMS IN SOFTWARE-DEFINED SENSING AND IMAGING SYSTEMS

      Lee, Hua; Univ California Santa Barbara, Dept Electrical and Computer Engineering (International Foundation for Telemetering, 2019-10)
      The probing waveforms play a crucial role in the performance of software-defined sensing-imaging systems. The characteristics of the probing waveforms govern both the computation complexity and accuracy of the estimation. This paper describes the concepts of the design and utilization of the probing waveforms for sensing and imaging applications.
    • DESIGNING A TELEMETRY SYSTEM WITH A FOCUS ON EDUCATION

      Marcellin, Michael; Fuehrer, Daniel; Nguyen, James; Schreiber, Andre; Univ Arizona, Dept Electrical and Computer Engineering (International Foundation for Telemetering, 2019-10)
      The University of Arizona Baja Racing team competes in an international competition each year. We build a custom telemetry system for the car to collect data during races in order to inform design decisions and warn of upcoming problems. This paper will focus on the contrast between designing a system for production versus designing for the educational experience, as is the ultimate goal of our team. We will specifically discuss this contrast in the areas of size, power consumption, manufacturability, maintainability, repairability, and testability.
    • DEVELOPING WIRELESS IMUS TO SIMPLIFY INTEGRATION INTO DYNAMIC SYSTEMS

      Kosbar, Kurt; Lipina, Jacob; Christmas, Austin; Marcolina, Rebecca; Missouri University of Science and Technology (International Foundation for Telemetering, 2019-10)
      This paper discusses the development of wireless inertial measurement units (IMUs) designed to transmit data from a prototype Mars rover to a remote base station. These nine degree of freedom, multi-chip modules provide measurements for linear acceleration, angular rotation velocity, and magnetic field vectors for the rover’s chassis and robotic arm end-effector. To facilitate integration into these dynamic systems, each unit is independently powered and has a form factor of 108 cc. IMU data is sent from 32-bit microcontrollers with embedded IEEE 802.11 b/g/n Wi-Fi to the rover via UDP transport through a custom publish/subscribe distributed IP protocol. Data is relayed over two circular polarized omnidirectional antennas to the base station’s dual linear MIMO Yagi-Uda antenna. The information gathered provides operators a heading and orientation to improve situational awareness, as camera visuals are often inadequate.
    • DEVELOPMENT OF NETWORK DATA AGGREGATOR FOR PAYLOAD FILTERING TO CONTROL TELEMETRY BANDWIDTH

      Ellerbrock, Phil; Reyzer, Charles; Zettwoch, Bob; Kragick, Andy; Troshynski; The Boeing Company; Avionics Interface Technologies (International Foundation for Telemetering, 2019-10)
      Emerging aircraft avionics and vehicle management communication systems have switched to higher data rate networks such as Ethernet and Fibre Channel, requiring Flight Test systems that can acquire data information from these networks. The data has moved onto higher speed networks, but the telemetry bandwidth has not increased, therefore producing a need to selectively capture data from within a packet, down to the bit level, for telemetry without capturing the entire message. Ethernet and Fibre Channel are transport protocols without rigid payload structure definitions as seen with MIL-STD-1553 or ARINC-429. Avionics traffic can be defined in any manner including dynamic length components or repeating structures that are difficult to define generically. AIT (Avionics Interface Technologies) developed the Airborne Network Data Aggregator (ANDA) unit for The Boeing Company with six different payload structure filter types to generically capture data out of network structures.
    • 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.
    • DIRECT IMPLEMENTATION OF A BIDIRECTIONAL NETWORK COMMUNICATION LINK IN CIVIL AIRCRAFT FLIGHT TEST USING MODIFIED LTE AIR-TO-GROUND SYSTEM

      Du, Xianyu; Deng, Guobao; COMAC Flight Test Center (International Foundation for Telemetering, 2019-10)
      This paper mainly describes a preliminary trial implementation of a bidirectional network communication link for aircraft range flight test application based on modified LTE Air-to-Ground systems. The theoretical feasibility of this trial which integrated the existing on-board network-based acquisition system installed on our regional jet and a newly designed modified LTE Air-to-Ground communication system was carefully analysed and validated before system level ground experiments. Finally, several test flights were performed within a specific airspace with two eNodeBs, which configured as an independent LTE network and covered most of the designed flight path, and the test results give us the conclusion that under the promise of deploying reliable ground base stations, LTE system has the potential capability to provide acceptable bandwidth and time delay performance for range flight test application.
    • DOPPLER POWER SPECTRA FROM VEHICLE-TO-EVERYTHING PROPAGATION EXPERIMENTS

      Rice, Michael; Harrison, Willie K.; Norman, Kalin; Jensen, Benjamin; Brigham Young University, Dept Electrical and Computer Engineering (International Foundation for Telemetering, 2019-10)
      This paper presents the results of vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) propagation experiments. The experimental results are summarized by Doppler power spectra. Our measurements indicate the need for a dynamic system that can handle the variable channels experienced in vehicle-to-everything communications.
    • DUAL-CHANNEL RECEIVER PERFORMANCE USING BESTCHANNEL SELECTION: FIELD TEST RESULTS

      Uetrecht, Jim; Quasonix, Inc. (International Foundation for Telemetering, 2019-10)
      Best-Channel Selection (BCS) uses real-time data quality metrics (DQM) to select the best demodulated bits from Channel 1, Channel 2, and the Combiner of dual-channel receivers. Laboratory testing has demonstrated a substantial reduction in bit error rate (BER) relative to individual channels (including the Combiner) under some synthesized link conditions, with no degradation in BER under the remainder of tested link conditions. This paper extends those results to real-world flight tests.
    • EFFECT OF ROTATING PROPELLERS ON TELEMETRY SIGNALS

      Geoghegan, Mark; Nusair, Marwan; Quasonix (International Foundation for Telemetering, 2019-10)
      The migration of aeronautical telemetry systems to C band has prompted a fresh look at many historically uninteresting facets of telemetry links. The effects of higher cable losses and smaller antenna beamwidths, for example, have been recognized and accounted for. Recent flight tests at Edwards AFB with a propeller-driven aircraft have revealed another such effect, which we have termed “prop chop”. Realtime data quality metric (DQM) values showed a periodic fluctuation in DQM, related to the aircraft engine speed. An investigation of this phenomenon using detailed electromagnetic simulation of a transmit antenna in the presence of a propeller shows a mechanism for this interference, both when the propeller is in front of the transmit antenna and when it is behind the transmit antenna. This paper compares the electromagnetic propagation simulation results to measured values from the field.
    • EFFECTS OF SWARM DENSITY ON MULTIHOP DRONE TELEMETRY DATA

      Rohrer, Justin P.; Naval Postgraduate School Monterey, Dept Computer Science (International Foundation for Telemetering, 2019-10)
      Bandwidth being a limited resource in airborne telemetry networks, drone swarms are particularly challenging to instrument due to the number of airborne nodes involved. Even a modest amount of data being transmitted by each node may overwhelm the network. Prior work has evaluated these effects in a number of drone swarm mobility scenarios,and shown the difficulty of achieving reliable data delivery. However, those results do not distinguish between data loss due to congestion of the available spectrum, and loss due to changing network topologies or disconnection due to mobility. In this work we attempt to isolate those effects by keeping a simulated drone swarm stationary,and focussing on the telemetry data delivery due to changing the size and density of the swarm. We compare the performance using no multi-hoprouting protocol, as well as using DSDV, AODV, DSR, and OLSR.
    • 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
    • HIGH-PERFORMANCE EXTENSIBLE SOQPSK (E-SOQPSK) MODULATION WAVEFORMS FOR AERONAUTICAL MOBILE TELEMETRY COMMUNICATIONS

      Lu, Cheng Y.; Argula, Rajeev; Sasvari, Gyorgy; Cook, Paul; Teletronics a Curtiss-Wright Company (International Foundation for Telemetering, 2019-10)
      To utilize the resilience to multipath and rapidly varying Doppler shifts offered by a multicarrier (MC) Orthogonal Frequency Division Multiplexed (OFDM) modulation waveform, and the high transmitter power efficiency offered by a single carrier (SC) Shaped Offset Quadrature Phase Shift Keying (SOQPSK) modulation waveform, we propose a novel Extensible Shaped Offset Quadrature Phase Shift Keying (E-SOQPSK) modulation waveform. E-SOQPSK is an OFDM structured single carrier modulation waveform, configurable to include OQPSK, SOQPSK, or mQAM. Preliminary laboratory results confirmed its low Peak-to-Average Power ratio (PAPR) and high spectrum efficiency. Preliminary simulations demonstrated multipath resilience of ESOQPSK waveform by utilizing OFDM structure based Frequency-Domain equalization at receiver.
    • Hybridization of wireless technologies for the aerospace instrumentation

      Percie du Sert, François-Gabriel; Zodiac Data Systems (International Foundation for Telemetering, 2019-10)
      Whatever the flight test or space launch vehicle, instrumentation presents strong intrusiveness due to cabling. The industry is resolutely looking for a transition toward wireless architectures for elimination of cabling while not compromising data integrity and network performances. The ideal wireless solution is a single technology that could encompass all the needs. But there is a wide variety of use cases and associated requirements: data throughput, synchronization accuracy, power consumption, robustness of the link, frequency regulation constraints. Today, no technology is able to cover all these needs. However, multiple technologies show specific characteristics that are optimized for some particular use cases. Hybridization of multiple wireless technologies in a complex system is the right solution to address specific applications with the optimal wireless instrumentation solution and no concession on performance.
    • Implementation and Benefits of Best Source Selection

      Gerstner, Grant; Normyle, Dennis; NAVAIR Atlantic Division (International Foundation for Telemetering, 2019-10)
      A comprehensive guide to implementing best source selection at a test range. This paper uses the history of the Atlantic Test Range's implementation as a guide to show the steps needed to implement Best Source Selection. It also discusses the advantages to best source selection at all levels of implementation.
    • Intelligent Monitoring Technology of Flight Test Based on Automatic Identification of Test Points

      Shenghu, Liu; Zhe, Yang; Bing, Ye; Chinese Flight Test Establishment (International Foundation for Telemetering, 2019-10)
      As the smallest component unit of the flight test task, test point defines the tasks and requirements to be completed by the test aircraft, which is the main basis for the flight effect evaluation. This article through in-depth analysis parameters variation characteristics of the testing aircraft in different test points, combined with the prior knowledge that the domain experts artificial recognize test points, extraction the key parameters of influencing test point identification, and their change rule. We constructed the knowledge base for test point identification, designed test point automatic identification algorithm. Combined with the flight test real-time task evaluation technology, we developed the real-time monitoring system for flight test based on the test point automatic identification and intelligent evaluation. It realized the change from the "intelligent security monitoring" to "intelligent task monitoring", and effectively improve the flight efficiency of the test aircraft.
    • INTERFERENCE MITIGATION OF ADJACENT RADIO FREQUENCY SIGNALS ON A FLEXIBLE SOFTWARE-DEFINED RADIO TESTBED PLATFORM

      Gonzalez, Virgilio; Elahi, Mirza M.; Sandoval, Jose C.; Corral, Pabel; Yasuda, Susumu; Univ Texas, Computational Science Program; Univ Texas, Dept Electrical and Computer Engineering; White Sands Missile Range, U.S. Army Test and Evaluation Command (International Foundation for Telemetering, 2019-10)
      The radio frequency (RF) spectrum is crowded with users and adjacent frequency users are facing an increase in interference from each other. The spectrum governing body Federal Communications Commission (FCC) has the difficult task of allocating spectral bands for new users for mobile devices using 4G LTE technology. Telemetry (TM) is affected by the adjacent band 4G LTE users in terms of signal degradation. To minimize the interference between adjacent frequency users, several methods can be used. A common but inefficient method separates adjacent band frequencies using guard bands which leaves a big portion of the spectrum unused. Alternatively, adjacent RF signals can be separated using digital filtering techniques with the signal of interest being unharmed and reducing the signal power of the interfering signal. A digital filtering technique includes bandpass filter (BPF) rejection, which has the ability to filter out adjacent interfering signals. This is accomplished by designing bandpass digital filters where the passband and stopband frequencies are adjusted to achieve maximum signal power and reject the interfering signal by reducing its power. A flexible software-defined radio testbed is set up to experiment and analyze this scenario with ease and effective measures.
    • Investigation into the Development of a Wireless IoT Penetration Testbed

      Thompson II, Willie L.; White, Tellrell; Morgan State University (International Foundation for Telemetering, 2019-10)
      IoT protocols have been proposed to replace wired systems in aircraft to support telemetry applications. They offer several advantages to wired systems due to them being wireless, low cost, and consuming less power. However, the one consideration that is often overlooked is the security of these wireless protocols. This project focused on investigating the use of open source hardware and software frameworks to create a wireless testbed to conduct penetration testing of the ZigBee protocol. To accomplish this task, the open source XBee software library was used to implement the ZigBee Network and Application Layers within the GNU Radio IDE. The XBee hardware module was leveraged for the IEEE 802.15.4 PHY and MAC Layers.