• UNIFICATION OF SIGNAL MODELS FOR SOQPSK

      Perrins, Erik; Rice, Michael; University of Kansas, Electrical Engineering & Computer Science Department; BYU, Department of Electrical and Computer Engineering (International Foundation for Telemetering, 2018-11)
      This paper begins by summarizing a recent advancement in the way that shaped offset quadrature phase shift keying (SOQPSK) waveforms can be viewed. This new viewpoint succeeds in eliminating the need for SOQPSK to be thought of as a “special” kind of correlated, ternary continuous phase modulation (CPM). Instead, SOQPSK can be viewed as an ordinary, binary CPM. We provide all of the details necessary to achieve a complete unification of SOQPSK models at the waveform level, at the bit sequence level, and in terms of waveform initialization. With this information, SOQPSK users can easily mix and match SOQPSK models at the transmitter and receiver in order to make use of the advantages of each model.
    • USING GPS RECEIVER 1PPS OUTPUT TO VERIFY TIME STAMP ACCURACY AND MEASURE PROPAGATION DELAY

      Knudtson, Kevin; Moreno, Antonio; NASA Armstrong Flight Research Center; NASA Armstrong Flight Research Center, Arcata Associates Inc. (International Foundation for Telemetering, 2018-11)
      A simple pulse overlay circuit using a logic OR gate was developed to overlay a precise leading edge 1 pulse per second time reference marker from a global positioning system receiver onto a non-return -to- zero-level pulse code modulation telemetry data stream to validate time stamp accuracy and measure propagation delay in telemetry equipment.
    • USING PHOTOGRAMMETRIC ANALYSIS WITH HIGH-SPEED CAMERAS IN FLIGHT TESTING APPLICATIONS

      Moore, Russ; Aerospace Instrumentation Curtiss-Wright (International Foundation for Telemetering, 2018-11)
      Flight test engineers sometimes need to conduct photogrammetric analysis to investigate transient phenomena and validate computer and wind tunnel models. Data is captured to characterize the performance of the aircraft and its avionics and other equipment and for store separation tests. Store separation encompasses such functionality as fuel tank release, landing gear operation and missile deployment. To capture accurate visual data during flight tests requires the use of a high-speed camera device capable of capturing moving images with exposure times for each image of less than 1/1,000 second or frame rates in excess of 200 frames per second. The cameras used in store separation FTI applications must be very environmentally rugged and perform optimally and accurately in harsh environments. Any potential failure must be mitigated because of the high cost of keeping a test platform in the air. Post-test, it is important that the images can be correlated so the data is suitable for photogrammetric analysis. This paper discusses what is required for successfully capturing data in flight tests for photogrammetric analysis and outlines a high speed camera system solution.
    • WIRELESS SOIL SENSOR PODS FOR LONG-TERM DATA COLLECTION

      Lipina, Jacob; Van Horn, Andrew; Schad, Judah; Kosbar, Kurt; Missouri University of Science and Technology (International Foundation for Telemetering, 2018-11)
      This paper discusses the applications of a wireless telemetry module used to collect remote sensor data used in a teleoperated electric vehicle that competed in the 2018 Mars University Rover Challenge (URC). Remote wireless soil sensor pods, 100 cc in volume, equipped with a 32-bit microcontroller and embedded IEEE 802.11 b/g/n Wi-Fi were distributed at key locations to relay soil moisture and temperature values over a local repeater to a remote base station. Combined with a low power deep sleep mode (1.84 mW), two 2500 mAh lithium-ion polymer batteries, and voltage regulation electronics, such a device could periodically relay telemetry data for many years without recharge. The small size presents the opportunity for large scale production and distribution across exoplanetary surfaces for monitoring soil characteristics over time.
    • WIRING HARNESS CONSTRUCTION AND DATA PROTOCOL SELECTION FOR HIGH NOISE APPLICATIONS

      Schultz, Aaron; Marcellin, Michael; Univ Arizona (International Foundation for Telemetering, 2018-11)
      The main problem with wired data transmission is exposure to electrical noise. In environments with extremely high noise levels, special care needs to be taken in order to accurately send data between two or more devices. In the case of motorsports, extreme noise on any critical data lines can cause engine failure, putting the driver’s safety at risk. The purpose of this paper is to explain effective construction techniques for noise reduction in a wiring harness, as well as to review how certain serial data protocols will handle errors in harsh conditions.