• DATA ACQUISITION AND THE ALIASING PHENOMENON

      Claflin, Ray, III; Claflin, Ray, III; CLAFLIN ASSOCIATES (International Foundation for Telemetering, 2001-10)
      In current practice sensor data is digitized and input into computers, displays, and recorders. To try to reduce the volume of digitized data, our original hypothesis was that by selecting a subset of digital values from an over-sampled signal, we could improve signal identification and improve perhaps Nyquist performance. Our investigations did not lead to significant improvements but did clarify our thinking regarding the usage of digitized data.
    • FILTERING CONSIDERATIONS WHEN TELEMETERING SHOCK AND VIBRATION DATA

      Walter, Patrick L.; Endevco; Texas Christian University (International Foundation for Telemetering, 2001-10)
      The accurate measurement of shock and vibration data via flight telemetry is necessary to validate structural models, indicate off-nominal system performance, and/or generate environmental qualification criteria for airborne systems. Digital telemetry systems require anti-aliasing filters designed into them. If not properly selected and located, these filters can distort recorded time histories and modify their spectral content. This paper provides filter design guidance to optimize the quality of recorded flight structural dynamics data. It is based on the anticipated end use of the data. Examples of filtered shock data are included.
    • HIGH ALPHABET FLIGHT TERMINATION SYSTEM

      Hunter, Richard E., Jr.; CMC ELECTRONICS-CINCINNATI (International Foundation for Telemetering, 2001-10)
      This paper proposes a modification of the high alphabet method of data transmission over an RF carrier. The system maps eleven characters into three tones. The three tones are Frequency Modulated onto an RF carrier. The 165 unique characters can be utilized for data transmission. The advantages of this system are: 1. Longer duration data words which have narrow bandwidth yielding a high signal to noise ratio. 2. Digital Signal Processing can be utilized to reconstruct characters from the tri-tone encoding. 3. The system will be less susceptible to external interference than normal Frequency Shift Keying system. The majority of the three tone burst would have to masked in order to loose a data word.
    • PYROTECHNIC SHOCK AND RANDOM VIBRATION EFFECTS ON CRYSTAL OSCILLATORS

      Carwell, James W.; CMC Electronics Cincinnati (International Foundation for Telemetering, 2001-10)
      Today’s telemetry specifications are requiring electronic systems to not only survive, but operate through severe dynamic environments. Pyrotechnic shock and Random Vibration are among these environments and have proven to be a challenge for systems that rely on highly stable, low phase noise signal sources. This paper will mathematically analyze how Pyrotechnic shock and Random Vibration events deteriorate the phase noise of crystal oscillators (XO).
    • SENSATE-LINER EPLRS TELEMETERED DATA INPUT FOR ENCOMPASS

      Lind, Eric J.; Murray, Steve; Stevens, Ilya; Drozdowski, Nick; SPAWARSYSCEN; High Technology Systems Inc. (International Foundation for Telemetering, 2001-10)
      A systems engineering development for acquisition, transmission, processing, dissemination and display of information vital to combat casualty care and related first responder activities is presented. It utilizes a synergistic combination of two existing state-of-the-art Defense Advanced Research Projects Agency/Space and Naval Warfare Systems Center San Diego (DARPA/SSCSD) technologies (Sensate-Liner and ENCOMPASS) coupled via the Enhanced Position Location Reporting System (EPLRS), an existing wireless military tactical communication data system. Transmission Security and Communication Security (TRANSEC/COMMSEC) of environmental and biomedical data is thus accomplished from the battlefield via selected data links and Ethernet. System functionality and appropriate candidate interfacing technologies will be discussed.
    • APPLYING INTERACTIVE WEB PAGES

      Self, Lance; Kirtland Air Force Base (International Foundation for Telemetering, 2001-10)
      Visitors to web pages are, in most cases, restricted to viewing information the page designer has anticipated they will be interested in viewing. Many times this is adequate, but there are instances where the visitor wants the information they view to be based on selections they choose. The Air Force Research Laboratory (AFRL) Space Vehicles Directorate anticipates selected customers will have a need to view very large data sets that vary from the satellite payload to the satellite state of health1, and will require controlling what they view in an “ad hoc” manner. In response, AFRL is using Java Server Pages developed within the data center to bring interactive and dynamic web page content to these customers.
    • A Technical Study on Microwave FM Locked in Phase of Telemetry Transmitters

      Banghua, Zhou; Shiwei, Xiao; Xinan Electronic Institute (International Foundation for Telemetering, 2001-10)
      This paper describes techniques on the microwave FM locked in phase of transmitters in the reentry telemetry system. A few scheme configurations on the microwave FM locked in phase, its circuit characteristics and applications are analyzed. Research results show that the two-point injection microwave FM locked in phase is suitable for the telemetry system, which code rate is higher, band of wide, and modulation response very well.
    • SYNTHETIC APERTURE GROUND PENETRATING RADAR IMAGING FOR NONDESTRUCTIVE EVALUATION OF CIVIL AND GEOPHYSICAL STRUCTURES

      Brown, Andrew; Lee, Hua; University of California Santa Barbara (International Foundation for Telemetering, 2001-10)
      Synthetic-aperture microwave imaging with ground penetrating radar systems has become a research topic of great importance for the potential applications in sensing and profiling of civil and geophysical structures. It allows us to visualize subsurface structures for nondestructive evaluation with microwave tomographic images. This paper provides an overview of the research program, ranging from the formation of the concepts, physical and mathematical modeling, formulation and development of the image reconstruction algorithms, laboratory experiments, and full-scale field tests.
    • AN OBJECT-ORIENTED PC-BASED SYSTEM FOR TSPI COLLECTION AND DISTRIBUTION

      Paulick, Mike; Thomas, Tim; TYBRIN Corporation; Eglin Air Force Base (International Foundation for Telemetering, 2001-10)
      The Range Instrumentation and Control System (RICS) is a PC-based client/server application designed to collect time-space position information (TSPI) from remote radar test sites and distribute it in real-time across a wide area network (WAN). The system architecture is composed of two main parts - the Data Interface Adapter (or DIA, which runs under VxWorks and is implemented using C/C++) and the RICS console PC (which runs under Windows 2000 and is implemented in Java). CORBA is used to provide communication between the RICS console and DIA. This paper describes the design of the system, focusing primarily on the DIA software.
    • FOUNDATION INITIATIVE 2010: THE FOUNDATION FOR RANGE INTEROPERABILITY

      Rumford, George J.; Vuong, Minh; Bachinsky, Stephen T.; Powell, Edward T.; U.S. Army White Sands Missile Range; U.S. Army Simulation, Training, and Instrumentation Command; Science Applications International Corporation; Science Applications International Corporation (International Foundation for Telemetering, 2001-10)
      Foundation Initiative 2010 (FI 2010) is a joint interoperability initiative of the Director, Operational Test and Evaluation. The vision of FI 2010 is to enable interoperability among ranges, facilities, and simulations in a timely and cost-efficient manner and to foster reuse of range assets and future range system developments. To achieve this vision, FI 2010 is developing and validating a common architecture with a common range object model, a core set of tools, inter-range communication capabilities, interfaces to existing range assets, interfaces to weapon systems, and recommended procedures for conducting synthetic test events and training exercises. During FY 01, the project is developing the second Test and Training ENabling Architecture (TENA) Middleware Prototype as a basis for range communication. FI 2010 will advance a simulation-based acquisition or a ‘distributed engineering plant’ methodology to streamline weapon system acquisition. Benefits from the FI 2010 products include cost effective replacement of customized data links, enhanced exchange of mission data, organic TENA-compliant capabilities at test sites to be leveraged for future test events, and instrumentation system reuse. Through FI 2010, future inter-range operations, instrumentation development, and range capability sustainment will cost less and incur less risk.
    • ADVANCE PRACTICAL CHANNEL SIMULATORS FOR LEO SATELLITE CHANNELS WITH SELECTIVE FADING AND DOPPLER SHIFTS

      Haghdad, Mehdi; Feher, Kamilo; University of California Davis (International Foundation for Telemetering, 2001-10)
      Dynamic hardware and software schemes for trajectory based simulation of LEO satellite channel are presented and evaluated. The simulation models are based on the practical LEO satellite channels and change dynamically with the trajectory using the latitude and longitude of the LEO satellite as input. The hardware simulator is consisted of a trajectory based selective fade generator, a trajectory based Doppler shifter, trajectory based time shadowing simulator and a standard channel for addition of noise, ACI and CCI. A FQPSK modulated signal is passed through a trajectory based dynamic fade generator and the spectrum is distorted. Then the resulting signal is exposed to a trajectory based dynamic Doppler Shifter, simulating the passage of the satellite overhead. Then the proper AWGN, ACI or CCI is added to the signal. At the final stage the signal is passed through a trajectory based time Shadowing simulator. The software simulator is a dynamic real time simulator written in MatLab and its structure is similar to the hardware simulator.
    • EXPERIMENTAL RESULTS FOR MULTI-SYMBOL DETECTION OF PCM/FM

      Geoghegan, Mark; Nova Engineering Inc. (International Foundation for Telemetering, 2001-10)
      It has been previously shown, through computer simulations, that a multiple symbol detector can provide substantial gains in detection efficiency (nearly 3 dB) over traditional PCM/FM detectors. This is accomplished by performing correlations over multiple symbol intervals to take advantage of the memory inherent in the continuous phase PCM/FM signal. This paper presents measured hardware results, from a prototype developed for the Advanced Range Telemetry (ARTM) Project, that substantiate the previously published performance and sensitivity predictions. Furthermore, this work confirms the feasibility of applying this technology to high-speed commercial and military telemetry applications.
    • Data Collection Via Aircraft Powerlines

      Berard, Alfredo; Boolos, Tim; 46 TW/TSI; TRW (International Foundation for Telemetering, 2001-10)
      Advances in physical layer interface technologies have led to the ability to establish a virtual IP network over powerlines. Raw data packet transport speeds of over 10 Mbits/s have been achieved. The powerline is a dynamically changing electromagnetic environment completely unlike the stable, steady state environment of coaxial cables or twisted wire pairs. A special interface technique called adaptive Orthogonal Frequency Division Multiplexing (OFDM) is used to overcome the rapid and dynamic changes in transfer function and noise floor of the powerline. This paper describes the technique being used to implement a fast data collection network over aircraft powerlines that is being developed by the 46th Test Wing at Eglin Air Force Base under the CENTS Program.
    • LESSONS LEARNED AND PROCESS IMPROVEMENT FOR PAYLOAD OPERATIONS AT THE LAUNCH SITE

      Catena, John; Gates, Donald, Jr.; Blaney, Kermit, Jr.; National Aeronautics and Space Administration; Omitron, Inc. (International Foundation for Telemetering, 2001-10)
      For every space mission, there are challenges with the launch site/field operations process that are addressed too late in the development cycle. This potentially causes schedule delays, cost overruns, and adds risk to the mission success. This paper will discuss how a single interface, representing the payload at the launch site in all phases of development, will mitigate risk, and minimize or even alleviate potential problems later on. Experience has shown that a single interface between the project and the launch site allows for issues to be worked in a timely manner and bridges the gap between two diverse cultures.
    • IMPLEMENTATION AND PERFORMANCE RESULTS FOR TRELLIS DETECTION OF SOQPSK

      Geoghegan, Mark; Nova Engineering Inc. (International Foundation for Telemetering, 2001-10)
      Shaped Offset QPSK (SOQPSK), as proposed and analyzed by Terrance Hill, is a family of constant envelope waveforms that is non-proprietary and exhibits excellent spectral containment and detection efficiency. Results using a conventional coherent OQPSK demodulator without any special pulse shaping to recover the SOQPSK signal have been previously presented. This paper describes a trellis detector for SOQPSK-A and SOQPSK-B that provides superior detection performance, as compared to a traditional OQPSK detector, by accounting for the pulse shaping. Analytical error performance bounds, implementation of the trellis demodulator, and computer simulation results are presented.
    • Precious Bits: Frame Synchronization in Jet Propulsion Laboratory's Advanced Multi-Mission Operations System (AMMOS)

      Wilson, Elizabeth (Betsy); Jet Propulsion Laboratory (International Foundation for Telemetering, 2001-10)
      The Jet Propulsion Laboratory’s (JPL) Advanced Multi-Mission Operations System (AMMOS) system processes data received from deep-space spacecraft, where error rates are high, bit rates are low, and every bit is precious. Frame synchronization and data extraction as performed by AMMOS enhance data acquisition and reliability for maximum data return and validity. Unique aspects of data phase determination, sync acquisition and sync loss and other bit-level topics are covered.
    • A SMALL SATELLITE FOR MEASURING ATMOSPHERIC WATER CONTENT; PART II, CROSSLINK AND DATA COLLECTION

      Schooley, L. C.; Hittle, K.; Braga, A.; Ackerman, R.; Afouni, F.; Khalid, H.; Coleman, J.; Keena, T.; Page, A.; University of Arizona (International Foundation for Telemetering, 2001-10)
      This student paper was produced as part of the team design competition in the University of Arizona course ECE 485, Radiowaves and Telemetry. It describes a telemetering system design recommendation for a small satellite capable of conducting scientific research regarding atmospheric water content. This paper focuses on the cross-link subsystem required to make the scientific measurements and on the power generation and distribution subsystem for the satellite. A companion paper (Cramer, et. al.) focuses on the subsystems required to send the scientific data and monitored operational conditions from the satellite to, and commands to the satellite from, a ground station. The central objective is to validate a new technique for precisely measuring water vapor profiles of clouds throughout the troposphere. This method involves the detection of 4 SHF tones sent out from the International Space Station (ISS), providing high-resolution amplitude and phase delay data.
    • AN ADVANCED RECONFIGURABLE MULTI-CHANNEL COMMUNICATION TERMINAL FOR TELEMETRY APPLICATIONS BASED ON FLEXICOM 260A

      Chandran, Henry; Navtel Systems SA (International Foundation for Telemetering, 2001-10)
      Traditional communication hardware has focused on modular architectures. Now, with the incoming high speed DSP and FPGAs a shift from traditional modular architecture to reconfigurable architecture has taken place. The nature of this architecture allows to optimize various telemetry applications in a single platform. This paper describes a reconfigurable multi channel communication system.
    • IEEE P1451.3 A Developing Standard For Networked Transducers

      Eccles, Lee H.; Boeing Commercial Airplane Company (International Foundation for Telemetering, 2001-10)
      The IEEE P1451.3 standard for networked transducers is designed to support applications in many industries but aerospace representatives have had a major say in what is included in the standard. The standard is written to allow multiple different transducers to exist on a single transmission line. This single transmission line may also carry power to the transducers. A bus is expected to have a single controller and many transducers. Individual transducers may be operated in several modes including a strict master-slave relationship or individual transducers may operate independently from the bus controller. In addition the bus controller can provide a clock to allow all transducers to operate synchronously or the clock can be ignored for asynchronous operation. The standard includes an extensible command set and Transducer Electronic Data Sheets (TEDS) that allows for full plug and play operation of the transducer. If a manufacturer chooses to leave out some of the features that allow for plug and play operation the standard allows for that as well. This paper provides an overview of the features of the standard as well as the types of system that can best utilize these features.
    • Test and Evaluation of Ultra High Spectral Efficient Feher Keying (FK)

      Lin, Jin-Song; Feher, Kamilo; University of California; DIGCOM, Inc. (International Foundation for Telemetering, 2001-10)
      Performances of a subclass of a new spectral efficient modulation scheme, designated as Feher Keying [1], or FK, is evaluated. The Power Spectral Density (PSD) and Bit Error Rate (BER) characteristics of FK are presented. FK has ultra high spectral efficiency and satisfies the frequency mask for WLAN defined in FCC part 15, and it has a simple structure for high bit rate implementation.