• IMPACT OF PARAMETER SELECTION IN SOFT-DECISION FEEDBACK TURBO EQUALIZATION

      Nassr, Husam; Kosbar, Kurt; Missouri University of Science & Technology, Dept. of Electrical & Computer Engineering (International Foundation for Telemetering, 2018-11)
      In wireless communication systems, turbo equalization has been used to mitigate the intersymbol interference caused by dispersive channels. Despite its computational complexity, turbo equalization achieves high performance compared to systems that implement the equalization and coding processes separately. The large performance gain achieved through turbo equalization comes from exchanging soft information between the equalizer and decoder in an iterative manner. However, the computational complexity of turbo equalization can be a significant challenge for systems with limited hardware capabilities. This paper examines the performance gain versus computational complexity trade-off for a soft-decision feedback turbo equalizer (SDFTE).We show how to select parameters that achieve a desired performance specification, while minimizing implementation overhead. Sample results are presented from a simulation of a system using a Proakis channel exhibiting severe ISI using QPSK, 8PSK and 16QAM modulation schemes.
    • AN IMPROVED TELEMETRY SYSTEM FOR MONITORING AN OFF-ROAD RACECAR

      Anderson, Kohl; Boyer, Kyle; Brubaker, Laura; Fuehrer, Daniel; Herriman, Richard; Houston, Paul; Ruckle, Sean; Marcellin, Michael; Univ Arizona, Dept Elect & Comp Engn (International Foundation for Telemetering, 2018-11)
      The University of Arizona Baja Racing Team competes annually in a grueling off-road racing competition designed to test the durability of each team’s vehicle. For the last several years, we have been developing a custom telemetry system to monitor and analyze the performance of the vehicle in order to provide live diagnostics to the pit crew and driver, as well as to inform future designs. This year, we have redesigned the core of the system to be more modular and use more COTS parts in order to allow easier upgrade and repair, and have upgraded many existing sensors, added sensors to monitor driver vitals, improved the driver’s display, and embedded USB hubs in our power distribution boards to allow programming of all microcontrollers on the vehicle over a single USB interface. These changes will make future development easier and will produce far more data than we have had in previous generations.
    • INITIAL OBSERVATIONS OF 16-APSK USE IN C-BAND AERONAUTICAL TELEMETRY

      DePardo, Dan; University of Kansas, Information and Telecommunication Technology Center (International Foundation for Telemetering, 2018-11)
      The implementation of more advanced modulation formats such as Amplitude Phase Shift Keying (APSK), which can be spectrally more efficient and potentially less susceptible to adjacent channel interference than current aeronautical telemetry modulation schemes, could serve to mitigate telemetry frequency spectrum reductions and reallocations. This paper will detail initial laboratory transmitter measurements and observations of 16-APSK modulation performance in comparison to SOQPSK-TG.
    • INTEGRATED DATA ACQUISITION SOLUTIONS FOR AEROSPACE PLATFORMS WITH HIGHLY RESTRICTIVE SPACE AND WEIGHT REQUIREMENTS AND HARSH ENVIRONMENTAL CONDITIONS

      Quinn, Pat; Curtiss-Wright Defense Solutions, Aerospace Instrumentation (International Foundation for Telemetering, 2018-11)
      Space and weight are key factors in designing, mounting and installing data acquisition systems on UAV and missile development programs. Additionally, there are an increasing number of measurements and avionic busses that must be captured reliably and transmitted to the ground. This paper discusses the challenges faced by the current generation of solutions and proposes and integrated and expandable solution that addresses these challenges, meeting the requirements while future proofing the platform architecture for additional data acquisition requirements.
    • INTELLIGENT JAMMING USING DEEP Q-LEARNING

      Thurston, Noah; Vanhoy, Garrett; Bose, Tamal; Univ Arizona, Dept Elect & Comp Engn (International Foundation for Telemetering, 2018-11)
      The threat of a malicious user interfering with network traffic so as to deny access to resources is an inherent vulnerability of wireless networks. To combat this threat, physical layer waveforms that are resilient to interference are used to relay critical traffic. These waveforms are designed to make it difficult for a malicious user to both deny access to network resources and avoid detection. If a malicious user has perfect knowledge of the waveform being used, it can avoid detection and deny network throughput, but this knowledge is naturally limited in practice. In this work, the threat of a malicious user that can implicitly learn the nature of the waveform being used simply by observing reactions to its behavior is analyzed and potential mitigation techniques are discussed. The results show that using recurrent neural networks to implement deep Q-learning, a malicious user can converge on an optimal interference policy that simultaneously minimizes the potential for it to be detected and maximizes its impediment on network traffic.
    • International Telemetering Conference Proceedings, Volume 54 (2018)

      International Foundation for Telemetering, 2018-11
    • INTRODUCING TACL— A PROPOSAL FOR A NEW STANDARD T&E CONSTRAINT LANGUAGE

      Moskal, Jakub; Whittington, Austin; Kokar, Mitch; Abbott, Ben; VIStology, Inc.; Southwest Research Institute (International Foundation for Telemetering, 2018-11)
      It is expected that XML-based languages for configuring telemetry systems like MDL and TMATS will eventually replace their non-XML predecessors. However, despite its numerous benefits, XML does not solve all the related problems. In particular, it cannot harness the complexity of constraints that may pertain to vendor hardware or to express system-level constraints that span across entire networks of devices. In this paper, we present TACL, a T&E extension to W3C Shape Constraints Language (SHACL) for formulating constraints on configurations represented in MDL and TMATS, independently of any configuration software. TACL introduces high-level components that help to form constraints close to the user’s intent and are less concerned with the low-level syntax details. It exhibits much better resilience to changes in the XML schemas than the languages that refer directly to the XML trees. A proof of concept TACL engine has been successfully developed and applied to MDL/TACL configurations.
    • IS NVME STORAGE RIGHT FOR TELEMETRY APPLICATIONS

      Budd, Chris; SMART High Reliability Solutions (International Foundation for Telemetering, 2018-11)
      Generally, telemetry applications are not on the cutting edge of storage technology for several reasons: they do not need the high performance, cannot provide the power for high performance, and cannot afford the instability of new technologies. While Non-Volatile Memory Express (NVMe) might initially seem to be the opposite of those goals, it does in fact have the ability to meet them; power and performance can be matched to an application’s needs, and NVMe is gaining stability as it gains overall market share. With the overall data storage industry moving to NVMe, other storage interfaces will begin to decline and future improvements will occur only on NVMe. With the right ruggedization and customization options, NVMe can be a good fit for telemetry applications.
    • LINK DEPENDENT ADAAPTIVE RADIO PERFORMANCE ON DYNAMIC CHANNEL

      Alam, Tasmeer; Moazzami, Farzad; Dean, Richard; Morgan State University, Engineering (International Foundation for Telemetering, 2018-11)
      This paper includes analysis of aeronautical channel dynamics in flight simulations of the Link Dependent Adaptive Radio (LDAR). LDAR system includes realistic measurement of the throughput gain with the adaptation of the modulation and coding parameters for telemetry applications. To increase the accuracy, channel dynamics have been incorporated in the simulation. Dynamic channel simulator is developed by the customized two ray ground reflection channel model including Doppler shift, delay spread, and other channel dynamics. This paper shows the comparison of the performance of LDAR using both static and dynamic channel. The impact of creating accurate simulation results with this dynamic channel simulator reaches beyond LDAR and will help the telemetry community to improve the accuracy of computer simulation in the design and pre-test stages.
    • LTE HANDOVER ENHANCEMENTS FOR HIGH SPEED CELLULAR RANGE TELEMETRY

      Hegde, Vinayak; Nokia Corporation of America (International Foundation for Telemetering, 2018-11)
    • MOTION PARAMETER MEASUREMENT OF THE PARACHUTE BASED ON AI VISION

      Xiaolin, FENG; Jie, ZHANG; Zhongjie, WANG; Zanchao, WANG; Chinese Flight Test Establishment, Optical And Electrical Measurement Department, Institute Of Measurement Technology; Beihang University, School of Instrument Science and Opto-electronic Engineering (International Foundation for Telemetering, 2018-11)
      Parachute is an essential guarantee for flight safety. The offset angle on parachute deployment is an important parameter to evaluate its performance. In this paper, the principle of space constraint is applied to design a motion parameter measurement method based on monocular vision with high-speed camera. And an intelligent real-time tracking algorithm based on image features is proposed to obtain images of the parachute during the deployment process. The realtime position and the offset angle of parachute are achieved by this method in flight test, which provides a reliable and effective means for the design and improvement of the parachute.
    • NETWORK BASED TIMING MECHANISMS TO SUPPORT PRECISE ALIGNMENT OF REAL-TIME STREAMS

      Kovach, Bob; IPtec, Inc. (International Foundation for Telemetering, 2018-11)
      The efforts to implement the distribution of real-time information streams via IP packet-based networks in the range environment have largely utilized the recovery of timing information via implicit techniques, such as adaptive clock recovery. These techniques allowed the alignment of streams with disparate delay characteristics to accuracies on the order of 1 millisecond. With the availability of techniques to distribute high accuracy timing information to network nodes, the capability to recover and align real time streams on the order of microseconds is possible. This paper will focus on a methodology to perform precision stream alignment that utilizes timestamping and the IEEE 1588 Precision Time Protocol (PTP) as a clock source. IEEE 1588 is currently utilized in cellular networks to deliver synchronization to remote network elements, providing superior accuracy and stability. The paper will review expectations for performance and discuss considerations in system level design to optimize timing distribution performance and ultimately stream alignment accuracy. System elements and their effect on performance will be identified and characterized. Finally, a TM Gateway implementation example which utilizes PTP coupled with hardwareassisted timestamping techniques to align recovered TM streams to a high degree of accuracy will be described. Real world results for clock accuracy and expectations for stream alignment accuracy will be shared.
    • NETWORK CENTRIC RANGE ARHITECTURE

      Thom, Gary A.; GDP Space Systems (International Foundation for Telemetering, 2018-11)
      Today’s telemetry ground stations are migrating from traditional serial PCM data distribution to Telemetry over IP architectures. The Range Commanders Council has published IRIG 218-10 TELEMETRY TRANSMISSION OVER INTERNET PROTOCOL (TMoIP) STANDARD, which attempts to standardize PCM distribution over IP networks and is currently working on a revision. Ranges have begun investigating new TMoIP systems. This paper attempts to facilitate this migration by discussing the TMoIP, networking and architectural concepts that need to be considered when deploying a TMoIP system. The paper draws on the lessons learned over the previous 10 years of designing, installing, troubleshooting and optimizing telemetry data distribution over IP networks. It discusses the critical component and architectural decisions to be made and some of the pitfalls to be avoided.
    • Network Scheduling Algorithm with Efficient Backfill Process in the iNET

      Roh, Dongseok; Oh, Jonghun; Agency for Defense Development (International Foundation for Telemetering, 2018-11)
      One of the major advantage of integrated Network Enhanced Telemetry (iNET) system is data backfill. In the iNET, network data server requests signal retransmission from the on-board recorder when the signal dropout is detected, and data is retransmitted which leads successful reception. If there are numerous test articles (TA), however, multiple backfill process for signal request and data retransmission can cause undesirable capacity waste. This paper describes the improved backfill process in iNET with multiple TAs. This process includes grouping and scheduling algorithm within TAs, and the orthogonal and non-orthogonal transmission. The system model and results are analyzed by simulation.
    • A New Network Telemetry technique In Aviatic Flight Tests

      Xingguo, Zhang; Hong, Li; Guojin, Peng; Zanchao, Wang; Chinese Flight Test Establishment (International Foundation for Telemetering, 2018-11)
      In order to address the issue of insufficient telemetry frequencies in flight tests, a telemetry transmission solution is proposed to transmit the principal parameters and HUD video for multiple aircrafts based on bi-directional wireless network. All the key points including the wireless transmission architecture for airborne and ground integration, network resources management, and dynamic configuration of airborne test system are illustrated. The research result has been verified in flight tests, and the experimental methods and results are presented as well.
    • NOAA GOES DCS UPLINK SPECTRUM SHARING

      Harris, Jonathan; Kopp, Brian; University of North Florida, Electrical Engineering Department (International Foundation for Telemetering, 2018-11)
      The National Oceanic and Atmospheric Administration (NOAA) Geostationary Operational Environmental Satellite (GOES) Data Collection System (DCS) receives environmental data from approximately 28,000 Data Collection Platforms (DCPs) that transmit up to the GOES spacecraft in the Ultra-High Frequency (UHF) band between 401.7 Mega-Hertz (MHz) and 402.1 MHz. The radio spectrum around 402 MHz is also available to commercial satellite companies and several have recently begun using the spectrum. There are questions regarding whether the shared use of the spectrum by small satellites may pose an interference problem to the NOAA DCS program and if so how such issues might be mitigated. This paper discusses some of the pertinent technical issues regarding the performance of the DCS system, reviews some of the known commercial satellite systems sharing the spectrum and briefly discusses some of the issues that spectrum sharing creates.
    • NON-TRADITIONAL IMPLEMENTATION OF A TRADITIONAL SAFETY SYSTEM

      Cook, Paul; Aerospace Instrumentation Curtiss-Wright (International Foundation for Telemetering, 2018-11)
      Safety system implementation for Flight Termination involves the interconnection of specific signals from one (no redundancy) or both (redundancy) Flight Termination Receivers (FTR) to be telemetered to the ground for monitoring by the Range Safety Officer (RSO). The number of specific signals per FTR can be as high as 12 independent signals resulting in a large wire harness. The addition of an RS-232 programming interface on the radar transponder and telemetry transmitters adds weight and cost, takes up space and creates installation and maintenance issues. This paper discusses how switching to a serial wiring approach, such as a multidrop bus, will reduce wiring and allow for other features including more in-depth status information and quick system configuration reprogramming.
    • OBTAINING MEASUREMENT DATA USING COCKPIT VIDEO CAMERAS

      Ibaroudene, Hakima; Moodie, Myron L.; Abbott, Ben A.; Southwest Research Institute® (International Foundation for Telemetering, 2018-11)
      Rather than classic data bus-based acquisition and extraction, we can use cockpit video cameras to extract measurements. These technologies can reduce installation costs and complexity and minimize aircraft modification to obtain parameter data and may be sufficient for some quickturn, limited-scope flight test operations. This paper explores the challenges and possible approaches for extracting measurements from video imagery of cockpit displays and provides an in-depth case study of a portable cockpit display video measurement system that reads digital measurements from aircraft instrument panels.
    • OBTAINING SUPERIOR PERFORMANCE FROM DUAL-CHANNEL RECEIVERS USING BEST-CHANNEL SELECTION

      Uetrecht, Jim; Quasonix, Inc. (International Foundation for Telemetering, 2018-11)
      A Pre-Detection Maximal-Ratio Combiner (Pre-D MRC) provides optimal performance in the face of additive noise but sub-optimal and even potentially degraded performance in the face of other common channel impairments such as multipath. Using Data Quality Metric (DQM) information from the Pre-D MRC and its two input channels, a Best-Channel Selector (BCS) can correlate the three demodulated data streams and select the best available data on a bit-by-bit basis. Thus, the BCS can produce a single receiver output with optimal performance in additive noise and superior performance across all types of channel impairment – fulfilling the promise the Pre-D MRC cannot always keep. Further, since the BCS need only accommodate small and predictable latency differences between its inputs, its local performance may exceed that of an external source selector designed to handle seconds of delay between channels. This paper describes the BCS and presents performance results from several test scenarios.
    • ON THE PERFORMANCE OF FILTER BASED EQUALIZERS FOR 16APSK IN AERONAUTICAL TELEMETRY ENVIRONMENT

      Arabian, Farah; Rice, Michael; BYU, Department of Electrical and Computer Engineering (International Foundation for Telemetering, 2018-11)
      16APSK is a candidate modulation for aeronautical telemetry because it has better spectral efficiency than SOQPSK-TG, but requires a linear RF power amplifier. This paper investigates the BER performance of filter-based equalizers for 16APSK operating over multipath channels measured at Edwards AFB. The results show that decision feedback equalizers outperform the other equalizers and are capable of providing excellent multipath mitigation.