• BLIND ADAPTIVE EQUALIZER FOR MULTIPATH ENVIRONMENT IN LOW ELEVATION AERONAUTICAL TELEMETRY

      Ke, Zhou; Dalong, Yang; Shunqin, Xie; Xianglu, Li; Tao, Dai; Institute of Electronic Engineering, China Academy of Engineering Physics (International Foundation for Telemetering, 2018-11)
      It has been proved that multipath and timing-varying channels usually cause significant performance degradation, especially for low elevation scenario (0o~5o) in aeronautical telemetry. Channel models for various scenarios of the whole take-off process will be described in this paper. And we will present the experimental testing results to characterize the performance of a blind adaptive constant modulus algorithm (CMA) equalizer applied for PCM-FM receiver in low elevation aeronautical telemetry scenarios, including parking scenario, taxiing scenario, take-off scenario and far-flight scenario. The test results showed that the equalizer improved the signal quality and achieved a remarkable bit error rate (BER) performance gain in the multipath fading scenarios.
    • BSS with Heterogeneous Ethernet Sources

      MALIVERNEY, J.; NEXEYA Telemetry Skill Center (International Foundation for Telemetering, 2018-11)
      Nowadays, Telemetry Ground Station over a Range are all connected through Ethernet. Telemetry data can be dispatched from that layer to the Main Control Room. Nevertheless, Ethernet Protocols are so opened that the data transmitted can be heterogeneous (Throughput Ch10, Unpacked /Packed Synchronized data, PCM over Ethernet…). This paper describes an architecture based on a three layers software (Proprietary Layer, Software Frame Sync, and BSS) to manage BSS with these heterogeneous Ethernet sources. The assets (Test Range flexibility, low cost, easy upgrade) & the backwards (Encrypted data mismatch) with practical cases are also described.
    • BUILDING A FULLY CUSTOMIZABLE WINDOWS C# SOFTWARE CLIENT TO DISPLAY TELEMETRY FROM A REAL-TIME SOFT DECOM AND DISTRIBUTION SERVER

      Burns, Steven F.; Raytheon Missile Systems, Systems Test Directorate Integration and Verification Center (International Foundation for Telemetering, 2018-11)
      Once the telemetry is de-commutated by the real-time Soft Decom and Distribution Server, it will need a client to display the engineered values in real-time. To display the engineered values, the Client must connect to the real-time Soft Decom and Distribution Server using the Server’s message based subscription process. In addition, to be fully customizable, the Client needs to allow the user to select specific telemetry parameters and build displays to view the parameters. The RttmClient is a fully customizable real-time Windows client built using C#, Windows Presentation Foundation (WPF), Telerik Controls for WPF and NetMQ (C# lightweight messaging library). It is capable of displaying hundreds of real-time parameters in several displays. The parameters are displayed using different controls (widgets) including Numeric, Indicator (light), Gauge, Strip Chart, Table, Container and Text.
    • BYU MARS ROVER AT THE 2018 UNIVERSITY ROVER CHALLENGE

      Rozsa, Jace; Averett, Tyler; Killpack, Marc; Rice, Michael; Brigham Young University (International Foundation for Telemetering, 2018-11)
      This paper describes the design and performance of the BYU mars rover with an emphasis on the wireless communications system and the transmission and reception of data vital to the performance of the rover.
    • Can Homomorphic Encryption Reduce the Security Risks in Telemetry Post Processing Environments?

      Kalibjian, Jeff; Perspecta Labs (International Foundation for Telemetering, 2018-11)
      Homomorphic encryption [1, 2] is a branch of cryptography in which data transformation operations can be performed on already encrypted data—promising better protection of data as the data no longer needs to be decrypted in order for specific analysis operations to be performed. Thus, better security is achieved by absolutely minimizing the amount of time sensitive data is potentially exposed. After reviewing homomorphic encryption principles, system level architectures will be presented discussing where homomorphic encryption may best fit in the generally accepted data security taxonomy involving disk, file, and application encryption. Emphasis will be placed on application to telemetry post-processing environments.
    • CENTRALIZED REAL TIME MONITORING SYSTEM BASED ON MULTILAYER NETWORK ARCHITECTURE FOR FLIGHT TEST TELEMETRY

      Feng, Can; Liu, Tao; Mao, Wei; Wang, Wei; Flight Test Center of the COMAC, Instrumentation Department (International Foundation for Telemetering, 2018-11)
      The flight test telemetry real-time monitoring system is an indispensable part of civil aircraft flight test. With the current trend of network system, the traditional real-time monitoring model has difficulties in satisfying the requirements of increasing number of parameters, diversified types, large-scale system and high concurrency data streams. In response to the above issues, this paper proposes a monitoring system based on a three-tier architecture (data layer, business logic layer and presentation layer). The system uses TMoIP technology and Best Data Engine (BDE) to complete the selection of the best data source of multi-site flight test data streams. At the same time, the use of portability and rapid integration enables hundreds of terminals to work simultaneously. The system has been used successfully in China’s developing large civil aircraft C919 flight test program. The preparation time of the system has been greatly reduced, and the system performs stably.
    • CFO Estimation by Exploiting Channel Sparsity in Aeronautical Telemetry

      Afran, Shah; Saquib, Mohammad; Rice, Michael; The University of Texas at Dallas; Brigham Young University (International Foundation for Telemetering, 2018-11)
      In this paper, we explore a carrier frequency offset (CFO) estimation scheme with sparsity-constraint (SC) on the aeronautical telemetry channels. This SC CFO estimator is implemented in two steps. In the first step, channel support is recovered by combining compressed sensing techniques with the CFO estimate based on the non-sparsity constraint (NSC) on the channel. Next we use the estimated channel support to derive the SC CFO estimator. Simulations are performed to compare the performance of the SC CFO estimator against the existing NSC CFO estimators using shaped offset QPSK version TG (SOQPSK-TG) modulated iNET-formatted data over an aeronautical test channel.
    • A CHANNEL SPACING ANALYSIS FOR CODED-APSK

      Pathak, Sumant; Perrins, Erik; University of Kansas, Electrical Engineering & Computer Science Department (International Foundation for Telemetering, 2018-11)
      Amplitude Phase Shift Keying (APSK) is an attractive alternative to continuous phase non-linear modulations in telemetry systems with its low Peak-to-Average Power Ratio (PAPR). Since the PAPR is not exactly unity, we use APSK paired with Low-Density Parity Check (LDPC) codes to compensate for loss in power efficiency due to the power amplifier operating with backoff. In this paper we consider the adjacent channel spacing of a system with multiple configurations using LDPC coded APSK and SOQPSK-TG. We consider different combinations of 16 and 32-APSK and SOQPSK-TG and find the minimum spacing in frequency between the respective waveforms that does not distort system performance.
    • THE COAXIAL WAVEGUIDE ANTENNA - A NATURAL DESIGN FOR MULTI-BAND FEED APPLICATIONS

      Shea, Donald; Applied Antenna Technology (International Foundation for Telemetering, 2018-11)
      The coaxial waveguide antenna exhibits efficient multi-band operation in both tracking and nontracking applications. Radiation from coaxial waveguide operating in the TE1,1 mode produces an on-axis pattern similar to that of open-ended circular waveguide. A second mode, the TE2,1 mode, produces a difference pattern similar to that of a four arm spiral. An inner waveguide cavity operating in the TE1,1 mode and a concentric outer waveguide cavity simultaneously operating in the TE2,1 mode provides this antenna the ability to operate as a tracking feed. It is the intent of this paper to show how the coaxial waveguide antenna is ideally suited to meet many of today's antenna system requirements.
    • CODE-AIDED TIMING SYNCHRONIZATION FOR MULTI-H CPM AT LOW SIGNAL-TO-NOISE RATIO

      Shunqin, Xie; Ke, Zhou; Dahai, Chen; Xianglu, Li; Institute of Electronic Engineering, China Academy of Engineering Physics (International Foundation for Telemetering, 2018-11)
      In order to solve the problem of timing synchronization at low signal-to-noise ratio(SNR) for Multi-h CPM, a code-aided early-late loop(ELL) algorithm is proposed. The algorithm is based on the iterative detection of serially concatenated Multi-h CPM with convolutional codes. The ELL timing estimator based on sequence detection is extended to the maximum-logarithmic maximum a posteriori (max-log MAP) detection. By using the information updated by iterative detection, the timing accuracy of multi-h CPM can be improved at low SNR. The simulation results show that, even when the bit signal-to-noise ratio (Eb/No) is as low as 3dB~5dB, the estimating variance of the proposed synchronization can be close to the Cramer Rao bound(MCRB) of ARTM CPM. After this timing synchronizing, the detection performance of the 10th iteration is only 0.03dB loss compared with the performance with ideal synchronization.
    • CODEBOOK BASED TECHNIQUES FOR HIGH-PERFORMANCE GEOLOCATION

      Yang, Andrew; Goldsworthy, Dylan; Nakamura, Drew; Hua, Lee; Univ California Santa Barbara, Department of Electrical and Computer Engineering (International Foundation for Telemetering, 2018-11)
      Conventional geolocation techniques were developed based on time-delay estimation, followed by computation of the angle of arrival (AOA). The AOA computation is the main cause of latency, which significantly degrades the feasibility of real-time bearing-angle detection. The computation also adds to hardware complexity and power consumption, which is critical for small, light-weight and mobile devices. This paper presents a codebook based approach to geolocation. The delay profiles are mapped to a precomputed codebook to match the optimal estimation of the geolocation. This simplifies the computation procedure and makes real-time computing feasible. It utilizes limited memory capacity to reduce latency and hardware complexity. This approach also allows us to accurately assess the resolving capability. In addition, it reduces computation for joint estimation with multiple receiver units, especially in mobile format.
    • COGNITIVE EQUALIZATION FOR HF CHANNELS

      Teku, Noel; Bose, Tamal; Univ Arizona, Dept Elect & Comp Engn (International Foundation for Telemetering, 2018-11)
      In the High Frequency (HF) band, ranging from 3-30 MHz, long-range communications can be obtained by bouncing signals off the ionosphere without any significant infrastructure. However, the ionosphere changes rapidly, which can cause potentially harmful effects to the transmitted signal. This has motivated research into using adaptive equalization in this band to reverse these effects. However, a disadvantage of this technique is that based on the equalizer model and learning algorithm used, the error propagation may become significantly large, resulting in insufficient equalization to respond to these variations. To counter this, we investigate the usage of cognitive equalization, where an adaptive equalizer is equipped with the ability to change its structure (i.e. number of taps, step size, etc.) based on the current channel conditions and use probability of error to characterize its performance.
    • COMMON DATA PROCESSING APPLICATIONS ACROSS DECOMMUTATION VENDORS

      Bauer, William; Mann, Phillip; Raytheon Missile Systems (International Foundation for Telemetering, 2018-11)
      Traditional Decom Systems usually require vendor specific data descriptions and provide vendor specific processing capabilities. Using a Software Decom allows the Decom hardware to be setup with a minimal configuration. The added capability of a UDP Multicast over Ethernet for the framed decommutated data allows for common Applications to perform the heavy lifting of Archiving, Real Time Display, and Distributed Processing. Any PC listening on the Local Area Network can access the telemetry data in real-time. This allows common real-time displays, archival tools and data forwarding applications to all run simultaneously.
    • COMMUNICATION SYSTEMS FOR CUBESAT MISSIONS

      Case, Anna; Kosbar, Kurt; Missouri University of Science and Technology, Department of Electrical and Computer Engineering (International Foundation for Telemetering, 2018-11)
      Several design iterations of communication systems at the Missouri S&T Satellite Research Team reveal that software defined radios (SDR) are viable for low cost, fully functional, and reliable communication systems. Recent licensing policy changes have impacted a number of CubeSat missions, prompting the necessity of bandwidth efficient communication. In searching for solutions to minimize spectral congestion, these systems need to minimize power consumption and maximize data throughput. The flexibility that SDRs provide allows for dynamic link control in orbit. Once completed, the code used to implement this system will be open-sourced for future missions use.
    • COMPARISON OF FPGA EQUALIZER IMPLEMENTATIONS FOR HIGH-SPEED DATA TELEMETRY

      Schmalz, Daniel; Lennon, Joseph; Wang, Enkuang; Brothers, Timothy; Georgia Tech Research Institute (International Foundation for Telemetering, 2018-11)
      This paper examines the real-time implementation of equalization techniques. Telemetry RF channels are formidable due to the nature of desert test ranges – specifically due to multipath, changing path loss from environmental effects, and thermal distortions. This challenge is further complicated by the high velocity nature of test assets. Optimization of channel equalization in a real-time scenario is essential for high speed data telemetry over extended distances. This paper examines the mathematical background of equalization techniques and presents results based on FPGA implementations. The results were obtained from Vivado High Level Synthesis (HLS), which generates HDL from C/C++, as well as traditional VHDL coding. The contribution to the state of the art in this paper is the determination of the technological maturity of HLS versus traditional hand coding and the comparison of FPGA implementations of equalization algorithms against current platforms.
    • COMPREHENSIVE SPECTRUM MONITORING SYSTEM (COSMOS) FOR NEXT-GENERATION SPECTRUM SITUATIONAL AWARENESS

      Ziegler, Robert; Triolo, Anthony; Samtani, Sunil; Weaver, Joshua; Perspecta Labs; US Naval Sea Systems Command (International Foundation for Telemetering, 2018-11)
      Comprehensive Spectrum Monitoring System (COSMOS) is Perspecta Labs’ solution for Next-Generation Spectrum Situational Awareness (NGS2AS), a Spectrum Access R&D Program solicited and awarded through the National Spectrum Consortium. COSMOS will incorporate a mix of low-cost unattended RF sensors, networked using industry-standard interfaces; versatile back-end server processing and storage of sensor data; spectrum data analytics, reporting and visualization; and incorporation of historical and projected frequency usage data from DoD systems for planning of training and test missions. This paper describes the architecture and design of the COSMOS system and its sensor and server subsystems.
    • COMPRESSION, WHY, WHAT AND COMPROMISES

      Hightower, Paul; Instrumentation Technology Systems (International Foundation for Telemetering, 2018-11)
      Each 1080 video frame requires 6.2 MB of storage; archiving a one minute clip requires 22GB. Playing a 1080p/60 video requires sustained rates of 400 MB/S. These storage and transport parameters pose major technical and cost hurdles. Even the latest technologies would only support one channel of such video. Content creators needed a solution to these road blocks to enable them to deliver video to viewers and monetize efforts. Over the past 30 years a pyramid of techniques have been developed to provide ever increasing compression efficiency. These techniques make it possible to deliver movies on Blu-ray disks, over Wi-Fi and Ethernet. However, there are tradeoffs. Compression introduces latency, image errors and resolution loss. The exact effect may be different from image to image. BER may result the total loss of strings of frames. We will explore these effects and how they impact test quality and reduce the benefits that HD cameras/lenses bring telemetry.
    • Constraint Gain for Two Dimensional Magnetic Recording Channels

      Bahrami, Mohsen; Vasic, Bane; Marcellin, Michael; Univ Arizona, Dept Elect & Comp Engn (International Foundation for Telemetering, 2018-11)
      In this paper, we study performance gains of constrained codes in Two dimensional Magnetic Recording (TDMR) channels using the notion of constraint gain. We consider Voronoi based TDMR channels with realistic grain, bit, track and magnetic-head dimensions. Specifically, we investigate the constraint gain for two-dimensional no-isolated-bit constraint over Voronoi based TDMR channels. We focus on schemes that employ the generalized belief propagation algorithm for obtaining information rate estimates for TDMR channels.
    • CRTM C-band Lab Test Results

      Picha, Bob; Nokia Corporation of America (International Foundation for Telemetering, 2018-11)
    • CURRENT AND FUTURE DEVELOPMENTS IN FLIGHT TEST CONFIGURATION TECHNIQUES

      Whittington, Austin; Ibaroudene, Hakima; Abbott, Ben; Yao, Di; Hite, Joseph; Bapty, Theodore; Moskal, Jakub; Neumann, Michael; Southwest Research Institute; Vanderbilt University; et al. (International Foundation for Telemetering, 2018-11)
      As technologies like network-based telemetry and standardized configuration languages begin to see wider adoption within the flight test community, new techniques exploring the new possibilities they provide are also developed. This paper reviews a subset of these techniques, including successful use in commercial flight test, focusing on the concepts of constraints and their application in the field, specifically their use in helping users to create correct-by-construction configurations. We then explore ongoing efforts with the Air Force and DARPA to extend these techniques into constraint satisfaction and real-time adaptation, providing the ability to create and adapt configurations to match (possibly changing) test requirements.