• TSPI Radar Methodologies for Improved Positional Performance/Accuracy of C-Band Auto-tracking Telemetry

      Sternke, Barry; Ray, Matthew; BAE Systems (International Foundation for Telemetering, 2013-10)
    • High-Speed Wideband Frequency Synthesis

      Elo, Mark; Giga-Tronics Inc. (International Foundation for Telemetering, 2013-10)
    • International Telemetering Conference Proceedings, Volume 49 (2013)

      Unknown author (International Foundation for Telemetering, 2013-10)
    • Design and Semi-Autonomous Control of a 6-Axis Robotic Arm Used in a Remote Sensing Application

      Kosbar, Kurt; Sullivan, John; Coffman, Amy; Roberds, Benjamin; Roberts, Jordan; Missouri University of Science and Technology (International Foundation for Telemetering, 2013-10)
      This paper describes the sensor and actuator package for a 6-axis articulated arm which is part of a robotic vehicle entered in the Mars Rover Challenge competition. The robot is intended to perform some of the same duties as a human, but be remotely controlled. It uses an articulated arm for many of these duties. Because of the large number of degrees of freedom, it would be tedious to control each joint individually. A system was developed to measure the state of each joint, transmit this information back to a base station, and semi-autonomously control the arm.
    • Analysis of a Systems Engineering Based Approach to the University Rover Challenge

      Kosbar, Kurt; Jetter, Joshua; Missouri University of Science and Technology (International Foundation for Telemetering, 2013-10)
      The University Rover Challenge is a competition to build a scaled down version of a next-generation Mars rover. This paper describes the comprehensive systems engineering based approached used by the Missouri S&T Mars Rover Design Team. This student run, interdisciplinary team of approximately 50 students followed a comprehensive systems-engineering based approach to the conceptualization, design, implementation, test and evaluation of the project. This has allowed students to leverage their discipline specific expertise, while simultaneously facilitating the cross-disciplinary communication which is essential to the successful completion of the project. The team's performance in the competition will provide metrics to analyze the efficacy of this organization and approach.
    • Design of an Autonomous Robot for Indoor Navigation

      Kosbar, Kurt; McConnell, Michael; Chionuma, Daniel; Wright, Jordan; Brandt, Jordan; Zhe, Liu; Missouri University of Science and Technology (International Foundation for Telemetering, 2013-10)
      This paper describes the design and implementation of an autonomous robot to navigate indoors to a specified target using an inexpensive commercial off the shelf USB camera and processor running an imbedded Linux system. The robot identifies waypoints to aid in navigation, which in our case consists of a series of quick response (QR) codes. Using a 1080p USB camera, the robot could successfully identify waypoints at a distance of over 4 meters, and navigate at a rate of 50 cm/sec.
    • combined Modulation and Error Correction Decoder for TDMR Using Generalized Belief Propagation

      Vasić, Bane; Khatami, Mehrdad; University of Arizona (International Foundation for Telemetering, 2013-10)
      Constrained codes also known as modulation codes are a key component in the digital magnetic recording systems. The constrained codes forbid particular input data patterns which lead to some of the dominant error events or higher media noise. In data recording systems, a concatenated approach toward the constrained code and error-correcting code (ECC) is typically used and the decoding is done independently. In this paper, we show the improvement in combining the decoding of the constrained code and the ECC using generalized belief propagation (GBP) algorithm. We consider the performance of a combined modulation constraints and the ECC on a binary symmetric channel (BSC). We show that combining demodulation and decoding results in a superior performance compared to concatenated schemes. Furthermore, we compute the capacity of the joint ECC and modulation codes for 1-D and 2-D constraints.
    • Development of a Digital Potentiometer Circuit for Digital Compensation of Frequency and Temperature Variations of Kvco to Provide Reprogramming of the Transmitter RF Center Frequency in the Field

      Oder, Stephen; St. Gelais, Robert; Caron, Peter; Bajgot, Douglas; Cobham Electronic Systems (International Foundation for Telemetering, 2013-10)
      Cobham Electronic Systems, Inc. has developed a digital potentiometer circuit to allow for digital compensation of frequency and temperature variations in the VCO/PLL frequency control loop of a telemetry transmitter. The ability to reprogram the RF center frequency of a telemetry transmitter is a useful feature and is required on many telemetry programs. When setting the frequency modulation deviation (FM Modulation Index) of a telemetry transmitter, the exact setting will change with RF center frequency due to the variation of the transfer function of the VCO (Kvco). Typically, a resistor divider is used to set the frequency modulation deviation level by setting the output data signal amplitude. However, since Kvco varies with respect to RF center frequency, a method of adjusting frequency modulation deviation for each frequency setting is required. The shunt resistor in the resistor divider is replaced with a digital potentiometer to provide the necessary adjustment, using the on-board microprocessor to store a look-up table of settings versus frequency. A key feature of the digital potentiometer circuit is a method to increase the frequency bandwidth of the potentiometer. Digital potentiometers typically have frequency bandwidths measured in kiloHertz to MegaHertz, which limits their use in setting the frequency modulation deviation of high data rate telemetry transmitters. The circuit consists of a 256 position digital potentiometer and several resistors that are used to adjust the slope of the resistance vs. digital code curve and to translate the curve up and down along the Y-Axis. Adding external resistors to the digital potentiometer helps to increase the frequency bandwidth of the digital potentiometer. The selection of the maximum resistance range of the digital potentiometer is also important, as the potentiometer bandwidth is greater when a small portion of the total resistance is used. This paper will explore various methods of increasing the effective bandwidth of a digital potentiometer, with the goal of making them suitable for use in dynamically setting the frequency modulation deviation via digital control.
    • Using Chapter 10 User Datagram Protocol (UDP) Streaming and Ethernet Technologies to Support Ground-Based Aircraft Testing

      Diehl, Michael; Kuipers, Steven; Swain, Jason; Wilcox, Tab; U.S. Army Yuma Proving Ground (International Foundation for Telemetering, 2013-10)
      During a recent U.S. Army Yuma Proving Ground (YPG) ground test, an unexpected change in test location resulted in the implementation of an innovative ad hoc network solution to complete the planned test matrix. The original plan was to use an aircraft ground test facility; however, safety requirements resulted in the aircraft being placed 50 meters away from the facility. This distance was too great to use the existing connections; consequently, data collection and analysis were adversely affected until this time expedient solution was implemented.
    • Network-Based Data Acquisition System for Flight Test

      Eccles, Lee H.; Malchodi, Larry; Wilhelm, Kenneth A.; Boeing Test & Evaluation (International Foundation for Telemetering, 2013-10)
      The Boeing Test and Evaluation flight test organization tests many airplanes each year. Most of these tests involve 50 to 100 parameters and one or two flights. Airplane certifications may require up to 250,000 parameters and last for months. For the last 20 years we have wanted a modular system that would allow us to use the minimum acquisition hardware required to do the job. At the same time we wanted to train the Instrumentation engineers for a single system. We have achieved both goals with a network-based data acquisition system. We solved the lack of determinism with Ethernet by time-tagging all data in the Data Acquisition Units (DAU) using IEEE Std 1588 Precision Time Protocol. The DAUs themselves are small modules which allow us to install just the DAUs that we need for a given program. This has allowed us to implement the full range of systems yet have all of them operate with the same hardware and software. This paper discusses the architecture that we implemented and our successes with this system.
    • A Fully Network Controlled Flight Test Center and Remote Telemetry Centers

      Rubio, Pedro; Jimenez, Francisco; Alvarez, Jesus; Aribus Military (International Foundation for Telemetering, 2013-10)
      The purpose of this abstract is to show how Airbus Military Telemetry Ground Station has evolved from a Single Ground Station towards a Distributed Ground Station. For this we had to adapt ourselves to our growing number of remote stations, as well as developing the control needed to reach full interoperability among remote stations. In short, creating a Virtual Ground Station. In this paper we describe the starting point, a single ground station and its control, and the arrival point, different Ground Stations, and how control has evolved by using our own developed software called ENCOS (Network Equipment COntrol System).
    • C-Band Missile Telemetry Test Project

      Kujiraoka, Scott; Fielder, Russell; Naval Air Warfare Center Weapons Division (NAWCWD) (International Foundation for Telemetering, 2013-10)
      The physics associated with transmitting and receiving a telemetry signal at a frequency greater than an octave above the current operating band is such that an end-to-end evaluation of the complete data link system (both the transmit and receive side) is required. In 2012, Airborne Instrumentation Systems Division (AISD), Naval Air Warfare Center Weapons Division (NAWCWD) was sponsored by the Office of the Secretary of Defense (OSD) to develop a couple of short-range air-to-air missile platforms that use a specially-designed warhead-replaceable telemetry section incorporating three data links: (1) an S-band link to transmit Time- Space-Position Information (TSPI), (2) an C-band link, and (3) an additional S-band link where the latter two are transmitting the same pseudo-random bit sequence at the same effective radiated power level. Flight testing will consist of a series of captive tests conducted over land and water. The tests will be performed under a variety of conditions to induce potential issues caused by multipath, atmospheric ducting, fast-slewing of the tracking antenna, and large propagation losses. Flight testing will culminate with the live-fire of a missile over a military land range. This paper describes the continuing efforts of this test program from these series of flight tests, thus quantifying the performance of C-band telemetry data transmission as compared to the S-band.
    • Synchronization of SOQPSK-TG in Burst-Mode Transmissions

      Hosseini, Ehsan; University of Kansas (International Foundation for Telemetering, 2013-10)
      In this paper, we present a maximum likelihood synchronization algorithm which jointly estimates frequency offset, symbol timing and carrier phase for shaped-offset quadrature phase-shift keying (SOQPSK) signals. We have considered a burst-mode transmission scenario in which a known training sequence is embedded in the beginning of each burst for the purpose of data-aided (DA) synchronization in a feedforward structure. The proposed algorithm first estimates the frequency offset independently from other parameters. The estimated frequency is then used to derive the symbol timing which is followed by the carrier phase estimation. The mean-squared error (MSE) of the proposed algorithm is computed via simulations. The results show that the proposed algorithm performs near the theoretical Cramér-Rao bound (CRB) at signal-to-noise ratios (SNRs) as low as 0 dB.
    • Polarization Diversity in the Presence of Multipath Propagation

      Wagner, Grant; Rice, Michael; Brigham Young University (International Foundation for Telemetering, 2013-10)
      The possibility of polarization diversity using left and right hand circular polarization (LHCP and RHCP) in the presence of multipath propagation is examined. We show that there are differences in the received signal for LHCP and RHCP for a number of realistic scenarios. Because multipath propagation can produce different LHCP and RCHP signals, there exists the possibility for diversity improvement involving the two polarizations.
    • Adaptive Feature-Specific Spectral Imaging Classifier (AFSSI-C)

      Gehm, Michael; Dunlop, Matthew; Poon, Phillip; University of Arizona (International Foundation for Telemetering, 2013-10)
      The AFSSI-C is a spectral imager that generates spectral classification directly, in fewer measurements than are required by traditional systems that measure the spectral datacube (which is later interpreted to make material classification). By utilizing adaptive features to constantly update conditional probabilities for the different hypotheses, the AFSSI-C avoids the overhead of directly measuring every element in the spectral datacube. The system architecture, feature design methodology, simulation results, and preliminary experimental results are given.
    • Calibration of High Dimensional Compressive Sensing Systems: A Case Study in Compressive Hyperspectral Imaging

      Gehm, Michael; Poon, Phillip; Dunlop, Matthew; University of Arizona (International Foundation for Telemetering, 2013-10)
      Compressive Sensing (CS) is a set of techniques that can faithfully acquire a signal from sub- Nyquist measurements, provided the class of signals have certain broadly-applicable properties. Reconstruction (or exploitation) of the signal from these sub-Nyquist measurements requires a forward model - knowledge of how the system maps signals to measurements. In high-dimensional CS systems, determination of this forward model via direct measurement of the system response to the complete set of impulse functions is impractical. In this paper, we will discuss the development of a parameterized forward model for the Adaptive, Feature-Specific Spectral Imaging Classifier (AFSSI-C), an experimental compressive spectral image classifier. This parameterized forward model drastically reduces the number of calibration measurements.
    • A Tri-Band L, S, C Prime Focus Feed: Concept, Design and Performance

      Melle, Christophe; Chaimbault, David; Peleau, Fabien; Karas, Alain; Zodiac Data Systems (International Foundation for Telemetering, 2013-10)
      The flight test mission services need higher data rates due to increased system complexity and the need for more accurate, higher rate, and better data acquisition. The existing L or S band frequency spectrum allocation was a limiting factor to meet this increased data rate requirement. The World Radio-communication Conference (WRC 2007) attributed new additional frequency spectrum allocations in the C band for Aeronautical Mobile Telemetry (AMT). The international flight test community has taken this opportunity to immediately take advantage of the new C-band range 5091-5250MHz. This paper presents the multi-band feed product designed by the RF & Antenna Laboratory of ZODIAC DATA SYSTEMS company. This feed is foreseen to be used in prime focus configuration on any diameter parabola dish providing telemetry and tracking channels in three L, S, and C bands. Here, are described the concept and the technology achieved taking into consideration the performance and industrial constraints. Moreover, this contribution focuses on the electromagnetic simulations of radiating elements, the feed network and RF system integration. This paper is structured as follows: firstly, the objectives and the motivation for developing a prime focus feed which works in L, S, C bands are presented. In particular, the market constraints and approach to find the best solution satisfying the feed RF requirements, and mechanical constraints, such as weight, size and cost, are discussed. The second section describes the 5 step development cycle: principle and technology, design of the telemetry channels and tracking function, cohabitation of the different radiating elements, and problems of the channels isolations. The third section discusses the performance achieved using electromagnetic simulations. The fourth section talks about the integration of RF system feed. The paper concludes by discussing future work using the same concept that is applied to other telecommunication or telemetry frequency bands.
    • Signal Emitter Localization Using Telemetry Assets

      Parker, Peter A.; Lake, Melina; MIT Lincoln Laboratory (International Foundation for Telemetering, 2013-10)
      Telemetry ground stations spread over geographically diverse areas are well suited for use in passively locating the source of a distant transmitted signal. In a favorable positioning of receive sites, the accuracy of these passive localization techniques can compete with the accuracy of radars. In these cases, use of receive only assets is a less expensive alternative than the use of a radar's scarce resources. Until recently, the major technical challenge to implementation of the passive localization techniques of time-difference of arrival (TDOA) and frequency-difference of arrival (FDOA) has been the frequency and time stability of geographically separated receivers. Advances in GPS based timing and frequency references has made the implementation of TDOA and FDOA feasible. This paper shows how these limitations have been overcome using the current telemetry assets at the Reagan Test Site in Kwajalein Atoll.
    • Using the Telemetry Application of TENA and Other JMETC Tools in Joint Distributed LVC Environments

      Hudgins, Gene; Poch, Keith; Treakle, Tom; Secondine, Juana; TENA Software Development Activity (SDA) (International Foundation for Telemetering, 2013-10)
      The TENA SDA has developed and validated a common architecture called TENA, which provides for real-time software system interoperability using the TENA Middleware, as well as interfaces to existing range assets, C4ISR systems, and simulations. The TENA Middleware, currently at Release 6.0.3, has been used by the range community for testing, evaluation, and feedback in many major exercises since 2002 and has been selected as the interoperability solution in JMETC's distributed testing. Through investment in TRMC's T&E/S&T Program and innovative use by Pacific Missile Range Facility (PMRF) and White Sands Missile Range (WSMR), TENA is expanding to the Telemetry community.
    • Writing a Validator for TMATS

      Kelly, Bryan; Tyndall Air Force Base (International Foundation for Telemetering, 2013-10)
      Applications that use TMATS benefit from the ability to presume that the TMATS data is well constructed. This need is met by a TMATS validator. Some classified systems need source code rather than an executable to avoid expensive testing before being allowed in. An Open Source Validator is proposed, presented and made available to the public. Major points and difficulties are discussed. The source is available in a Visual Studio 2008 project here: www.bkelly.ws/irig/validator.html A bulletin board for TMATS / Chapter 10 discussion is here: http://www.bkelly.ws/irig_106/