• ONLINE DISTRIBUTED VEHICLE AND MACHINERY HEALTH MANAGEMENT

      Dietz, Anthony; Friets, Eric; Finger, William; Bieszczad, Jerry; Miller, Matt; Freudinger, Lawrence; Creare Incorporated; NASA (International Foundation for Telemetering, 2003-10)
      Modern aircraft and space vehicles routinely sense and record vast quantities of information relevant to assessing the vehicles’ health. However, limitations imposed by the bandwidth of telemetry and network connections prevent real-time transmission of the complete data set to central stations for analysis. An online health-management system suitable for bandwidth-limited network environments that enables interrogation of the full data set by ground-based operators is described. The system uses distributed objects organized in a data processing hierarchy linked by a buffered data-management subsystem. Reduced health information is routinely transmitted, but dynamic reports may be requested on demand from any object.
    • RESEARCH AND IMPLEMENTATION OF MOBILE BANK BASED ON SSL

      Meihong, Li; Qishan, Zhang; Jun, Wang; Beihang University; Beijing University Of Post And Telecommunication (International Foundation for Telemetering, 2003-10)
      SSL protocol is one industrial standard to protect data transferred securely on Internet. Firstly SSL is analyzed, according to its characteristics, one solution plan on mobile bank based on SSL is proposed and presented, in which GPRS technology is adopted and elliptic curve algorithm is used for the session key, finally several functional modules of mobile bank are designed in details and its security is analyzed.
    • SPACE-BASED TELEMETRY AND RANGE-SAFETY STUDY TRANSCEIVER AND PHASED-ARRAY ANTENNA DEVELOPMENT

      Whiteman, Don; Sakahara, Robert; Kolar, Ray; NASA; Reliable Systems Services Corporation (International Foundation for Telemetering, 2003-10)
      The transmission of high-rate telemetry data for space-based relay systems yields unique system requirements. The NASA Space-based Telemetry and Range-Safety (STARS) study evaluated system design requirements during Phase-1 flight tests. STARS Phase-2 efforts include the development of a high-rate transmitter and antenna system to demonstrate prototype system performance capabilities and new technologies for future operational systems to be incorporated into the NASA Next Generation Launch Technology (NGLT) vehicles. Phase-2 Range User (telemetry) system performance requirements and a prototype implementation approach are presented.
    • Generalized Successive Interference Cancellation/Matching Pursuits Algorithm for DS-CDMA Array-Based Radiolocation and Telemetry

      Iltis, Ronald A.; Kim, Sunwoo; University of California (International Foundation for Telemetering, 2003-10)
      A radiolocation problem using DS-CDMA waveforms with array-based receivers is considered. It is assumed that M snapshots of N(s) Nyquist sample long data are available, with a P element antenna array. In the handshaking radiolocation protocol assumed here, data training sequences are available for all K users. As a result, the received spatial-temporal matrix R ∈ C^(MN(s)x P) is approximated by a sum of deterministic signal matrices S(k)^b ∈ C^(MN(s) N(s)) multiplied by unconstrained array response matrices A(k) ∈ C^(N(s)x P). The unknown delays are not estimated directly. Rather, the delays are implicitly approximated as part of the symbol-length long channel, and solutions sparse in the rows of A are thus sought. The resulting ML cost function is J = ||R - ∑(k=1)^K S(k)^bA(k)||(F). The Generalized Successive Interference Cancellation (GSIC) algorithm is employed to iteratively estimate and cancel multiuser interference. Thus, at the k-th GSIC iteration, the index p(k) = arg min(l ≠ p(1),...,p(k-1)) {min(A(l)) ||R^k-S(l)^bA(l)||(F)} is computed, where R^k = ∑(l=1)^(k-1) S(pl)^bÂ(pl). Matching pursuits is embedded in the GSIC iterations to compute sparse channel/steering vector solutions Â(l). Simulations are presented for DS-CDMA signals received over channels computed using a ray-tracing propagation model.
    • CALCULATING POWER SPECTRAL DENSITY IN A NETWORKBASED TELEMETRY SYSTEM

      Brierley, Scott; The Boeing Company (International Foundation for Telemetering, 2003-10)
      Calculating the power spectral density (PSD) at the transducer or data acquisition system offers advantages in a network-based telemetry system. The PSD is provided in real time to the users. The conversion to PSD can either be lossless (allowing a complete reconstruction of the transducer signal) or lossy (providing data compression). Post-processing can convert the PSD back to time histories if desired. A complete reconstruction of the signal is possible, including knowledge of the signal level between the sample periods. Properly implemented, this method of data collection provides a sharp anti-aliasing filter with minimal added cost. Currently no standards exist for generating PSDs on the vehicle. New standards could help telemetry system designers understand the benefits and limitations calculating the power spectral density in a network-based telemetry system.
    • NETWORKED DATA ACQUISITION DEVICES AS APPLIED TO AUTOMOTIVE TESTING

      Mastrippolito, Luigi; Aberdeen Proving Ground (International Foundation for Telemetering, 2003-10)
      The US Army Aberdeen Test Center (ATC) is acquiring, transferring, and databasing data during all phases of automotive testing using networked data acquisition devices. The devices are small ruggedized computer-based systems programmed with specific data acquisition tasks and then networked together with other devices in order to share information within a test item or vehicle. One of the devices is also networked to a ground-station for monitor, control and data transfer of any of the devices on the net. Application of these devices has varied from single vehicle tests in a single geographical location up to a 100-vehicle nationwide test. Each device has a primary task such as acquiring data from vehicular data busses (MIL-STD-1553, SAE J1708 bus, SAE J1939 bus, RS-422 serial bus, etc.), GPS (time and position), analog sensors and video with audio. Each device has programmable options, maintained in a configuration file, that define the specific recording methods, real-time algorithms to be performed, data rates, and triggering parameters. The programmability of the system and bi-directional communications allow the configuration file to be modified remotely after the system is fielded. The primary data storage media of each device is onboard solid-state flash disk; therefore, a continuous communication link is not critical to data gathering. Data are gathered, quality checked and loaded into a database for analysis. The configuration file, as an integral part of the database, ensures configuration identity and management. A web based graphical user interface provides preprogrammed query options for viewing, summarizing, graphing, and consolidating data. The database can also be queried for more detailed analyses. The architecture for this network approach to field data acquisition was under the Aberdeen Test Center program Versatile Information System Integrated On-Line (VISION). This paper will describe how the merging of data acquisition systems to network communications and information management tools provides a powerful resource for system engineers, analysts, evaluators and acquisition personnel.
    • TRANSPARENT SATELLITE BANDWIDTH ACCELERATION

      Gudmundson, Stephan; NetAcquire Corporation (International Foundation for Telemetering, 2003-10)
      While the transition to IP internetworking in space-based applications has a tremendous upside, there are significant challenges of communications efficiency and compatibility to overcome. This paper describes a very high efficiency, low-risk, incremental architecture for migrating to IP internetworking based on the use of proxies. In addition to impressive gains in communications bandwidth, the architecture provides encapsulation of potentially volatile decisions such as particular vendors and network technologies. The specific benchmarking architecture is a NetAcquire Corporation COTS telemetry system that includes built-in TCP-Tranquility (also known as SCPS-TP) and Reed-Solomon Forward Error Correction capabilities as well as a specialized proxy-capable network stack. Depending on network conditions, we will show that the effective bandwidth for satellite transmissions can be increased as much as a factor of one hundred with no external changes to existing internetworking equipment.
    • IEEE P1451.4 Smart Transducers Template Description Language

      Jones, Charles H.; Edwards Air Force Base (International Foundation for Telemetering, 2003-10)
      The IEEE 1451.4 smart transducer interface standard [1] provides a mechanism for both analog and digital, or mixed mode, interfacing to sensors and actuators, which are collectively referred to as transducers. The analog mode allows normal interfacing to the transducer. The digital mode is intended to provide the ‘smarts’ by allowing the transducer to provide basic information to the application system. This information is referred to as the transducer electronic data sheet (TEDS) and contains information ranging from serial number to calibration data and electrical characteristics. A major driving force behind the development of the standard was to minimize the amount of memory required to store a TEDS; with a stated objective of only needing 256 bits, although more are allowed. This requires a method of mapping the bits in a precise fashion. This bit mapping is accomplished through templates which are text based files written in the Template Description Language (TDL). The TDL is a formal language similar to programming languages, but with considerably less looping and conditional control. This is because the entire purpose of the language is to map bits and not to implement general processing or mathematical capabilities. This paper outlines the functionality and syntax of the TDL.
    • TELEMETRY IN BUNDLES: DELAY-TOLERANT NETWORKING FOR DELAY-CHALLENGED APPLICATIONS

      Burleigh, Scott; California Institute of Technology (International Foundation for Telemetering, 2003-10)
      Delay-tolerant networking (DTN) is a system for constructing automated data networks in which end-to-end communication is reliable despite low data rates, possible sustained interruptions in connectivity, and potentially high signal propagation latency. As such it promises to provide an inexpensive and robust medium for returning telemetry from research vehicles in environments that provide meager support for communications: deep space, the surface of Mars, the poles or the sub- Arctic steppes of Earth, and others. This paper presents an overview of DTN concepts, including “bundles” and the Bundling overlay protocol. One possible scenario for the application of DTN to a telemetry return problem is described, and there is a brief discussion of the current state of DTN technology development.
    • A CELLULAR PHONE-CENTRIC MOBILE NETWORK ARCHITECTURE FOR WIRELESS SMALL SATELLITE TELEMETRY SYSTEM

      Li, Mingmei; Guo, Qing; Harbin Institute of Technology (International Foundation for Telemetering, 2003-10)
      This paper aims to add the information access capabilities to enable user’s mobile terminals in a wireless small satellite telemetry system. The cellular phone-centric mobile network architecture provides wireless communication link; telemetry information is provided to users in a highly personalized form according to the end-user’s range. We choose a reference system-level model of network architecture and compare its performance with common small satellite telemetry network link; evaluation results derived using a known analytical model. The result of original hypotheses, network architecture’s prototype includes both analytical performance evaluation and simulation techniques, are discussed in detail.
    • FQPSK ANALOG/DIGITAL IMPLEMENTATIONS FOR LOW TO ULTRA HIGH DATA RATES IN 1Gb/s RANGE SYSTEMS

      Chen, Dijin; McCorduck, James A.; Feher, Kamilo; University of California, Davis; MatrixSat, Inc.; DIGCOM, Inc. (International Foundation for Telemetering, 2003-10)
      For simpler implementations of ultra high bit rate systems, combined analog/digital techniques, described here in, provide implementations with the smallest number of component count utilizing minimal “real-estate” and smallest DC power. While digital implementations with tradition Read Only Memory (ROM) and Digital to Analog Converters (DAC’s) have been proven in several commercial, NASA -CCSDS recommended, and U.S. DoD-IRIG standardized Feher’s QPSK (FQPSK) [2,3] products, such implementations can be further simplified, and in particular for ultra high bit rate product applications. Several waveform generating techniques such as linear approximation, analog approximation and mixed analog and linear approximations are investigated using preliminary simulation results.
    • Telemetry Data Encoder with an Embedded GPS Receiver

      Rivera, Alan; Herley Industries (International Foundation for Telemetering, 2003-10)
      This paper outlines the GPS data acquisition of two PCM encoders. The design of the first PCM Encoder uses an embedded GPS Receiver module, the Thales G12- HDMA receiver. The G12 Receiver has been integrated into the electronics of the PCM Encoder to provide a seamless tool for the Telemetry Engineer to acquire GPS position and time data with the sensor data acquired from the PCM Encoder. The second telemetry encoder discussed in this paper adds the GPS Interface Module for the Time Space Position Unit (TSPI) currently under development at Herley Industries. The TSPI Unit will also be integrated with the PCM Encoder tools to create a seamless user interface. The TSPI unit is available in both the “Low Dynamic (JTU-I)” and the “High Dynamic” (JTU-II).
    • SIMULATED PERFORMANCE OF SERIAL CONCATENATED LDPC CODES

      Panagos, Adam G.; University of Missouri at Rolla (International Foundation for Telemetering, 2003-10)
      With the discovery of Turbo Codes in 1993, interest in developing error control coding schemes that approach channel capacity has intensified. Some of this interest has been focused on lowdensity parity-check (LDPC) codes due to their high performance characteristics and reasonable decoding complexity. A great deal of literature has focused on performance of regular and irregular LDPC codes of various rates and on a variety of channels. This paper presents the simulated performance results of a serial concatenated LDPC coding system on an AWGN channel. Performance and complexity comparisons between this serial LDPC system and typical LDPC systems are made.
    • Space-Time Coding for Avionic Telemetry Channels

      Wang, Jibing; Yao, Kung; Whiteman, Don; University of California, Los Angeles; National Aeronautical Space Administration (International Foundation for Telemetering, 2003-10)
      Multiple antennas promise high data capacity for wireless communications. Most space-time coding schemes in literature focus on the rich scatter environment. In this paper, we argue that minimax criterion is a good design criterion for space-time codes over the avionic telemetry channels. This design criterion is different than those of space-time codes over rich scattering Rayleigh fading channels. Theoretical and numerical results show that the codes with optimal performance in Rayleigh fading channels do not necessarily have optimal performance in avionic telemetry channels. Therefore, the space-time codes should be carefully designed/selected when used in the avionic telemetry channels.
    • ALAMOUTI SPACE-TIME CODING FOR QPSK WITH DELAY DIFFERENTIAL

      Rice, Michael; Nelson, Tom; Brigham Young University (International Foundation for Telemetering, 2003-10)
      Space-time coding (STC) for QPSK where the transmitted signals are received with the same delay is well known. This paper examines the case where the transmitted signals are received with a nonnegligible delay differential when the Alamouti 2x1 STC is used. Such a differential can be caused by a large spacing of the transmit antennas. In this paper, an expression for the received signal with a delay differential is derived and a decoding algorithm for that signal is developed. In addition, the performance of this new algorithm is compared to the standard Alamouti decoding algorithm for various delay differentials.
    • STANDARD USER DATA SERVICES FOR SPACECRAFT APPLICATIONS

      Smith, Joseph F.; Hwang, Chailan; Fowell, Stuart; Plummer, Chris; National Aeronautics and Space Administration; SciSys; Cotectic, Ltd. (International Foundation for Telemetering, 2003-10)
      The Consultative Committee for Space Data Systems (CCSDS) is an international organization of national space agencies that is branching out to provide new standards to enhanced reuse of spacecraft equipment and software. These Spacecraft Onboard Interface (SOIF) standards will be directed towards a spacecraft architecture, as a distributed system of processors and busses. This paper will review the services that are being proposed for SOIF. These services include a Command and Data Acquisition Service, a Time Distribution Service, a Message Transfer Service, a File Transfer Service, and a CCSDS Packet Service. An Instrument & Subsystem “Plug & Play Service is currently under study, but is included in this paper for completeness.
    • THE SPREAD-SPECTRUM MULTIPLEXING TELEMETRY SYSTEM USING PARALLEL MOVE EQUIVALENT SEQUENCE

      Wang, Yongjian; Zhao, Honglin; Zhou, Tingxian; Harbin Institute of Technology (International Foundation for Telemetering, 2003-10)
      In this paper, based on the parallel move equivalent sequence of m sequence ,one type of CDM telemetry system is issued. Also the method for anti multi-path interference(MPI) of the system is proposed and its performance is analyzed. We proved that this system not only holds the merits which are inherent in common spread-spectrum communication system, but also has better transmission efficiency.
    • ADVANCED GPR SYSTEM FOR HIGH-PERFORMANCE TOMOGRAPHIC SUBSURFACE IMAGING

      Ono, Sashi; Lee, Hua; University of California, Santa Barbara (International Foundation for Telemetering, 2003-10)
      In this paper, the research prototype of a high-performance GPR imaging system is presented. The system is equipped with the capability of synthetic-aperture scan, stepfrequency FMCW illumination, and high-resolution tomographic image reconstruction.
    • ACQUISITION AND DISTRIBUTION OF TSPI DATA USING COTS HARDWARE OVER AN ETHERNET NETWORK

      James, Russell W.; Bevier, James C.; James Bros. Systems, Inc.; National Aeronautics and Space Administration; JB Systems (International Foundation for Telemetering, 2003-10)
      The Western Aeronautical Test Range (WATR) operates the ground stations for research vehicles operating at the NASA Dryden Flight Research Center (DFRC). Recently, the WATR implemented a new system for distributing Time, Space, and Position Information (TSPI) data. The previous system for processing this data was built on archaic hardware that is no longer supported, running legacy software with no upgrade path. The purpose of the Radar Information Processing System (RIPS) is to provide the ability to acquire TSPI data from a variety of sources and process the data for subsequent distribution to other destinations located at the various DFRC facilities. RIPS is built of commercial, off the shelf (COTS) hardware installed in Personal Computers (PC). Data is transported between these computers on a Gigabit Ethernet network. The software was developed using C++ with a modular, object-oriented design approach.
    • IMPLEMENTATION OF UNMANNED TELEMETRY GROUND SYSTEM USING MICROWAVE LINK

      Dong-soo, Seo; Sung-hoon, Jang; Sung-hee, Han; Heung-bum, Kim; Agency for Defense Development (International Foundation for Telemetering, 2003-10)
      Unmanned Telemetry Ground System (UTGS) was implemented in Defense System Test Center (DSTC), Agency for Defense Development (ADD). The components of UTGS are Antenna, NPS (Network Power Switch), RCB (Receiver/Combiner/Bit synchronizer) and microwave link. We have installed RCB which is composed of receiver, combiner and bit synchronizer. RCB can be controlled and monitored by RS232 serial communication and microwave network. NPS controls its power supplies. UTGS sends PCM stream to local site using E1-class HDSL and microwave link. This system is possible the signal acquisition and reduction of man power at remote site. The usability and performance of UTGS was proved in flight tests. This paper describes the hardware, software design and an implementation of UTGS.