• MOBILITY MANAGEMENT IN IP-BASED SPACE NETWORK

      Wei, Huang; Weiling, Wu; Beijing University of Posts and Telecommunications (International Foundation for Telemetering, 2005-10)
      This paper tries to discuss the mobility management when Internet technology is applied along the whole path from spacecraft to ultimate customers in ground. In addition to Mobile IP protocol, micromobility solution is introduced during cross-support. Those competing micromobility solutions in mobile network research area are compared to select one that is most suitable to space network topology characteristics and operation traditions. Other issues are also taken into account, such as deployment and compatibility with Mobile IP when cross-support is not provided. Simulation comparison for hand-off performance with and without micro-mobility solution during cross-support is presented to justify our proposition.
    • VEHICLE NETWORK CONCEPT DEMONSTRATION

      Grace, Thomas; Roach, John; Naval Air Systems Command; Teletronics Technology Corporation (International Foundation for Telemetering, 2005-10)
      CTEIP has launched the integrated Network Enhanced Telemetry (iNET) project to foster advances in networking and telemetry technology to meet emerging needs of major test programs as well as within the Major Range and Test Facility Base’s. This paper describes the objective of the vNET concept demonstration to provide a test vehicle instrumentation network architecture that can support additional capabilities for data access to the test vehicle. Three specific iNET system needs have been identified as being desirable as the basis for evaluating a Concept of Operation through this demonstration project. These three key areas are Data Mining, Gapless Telemetry, and Error Free Data delivery.
    • A 256 CHANNEL HIGH SPEED MODULAR FLIGHT COMPUTER FOR HYPERSONIC LAUNCH VEHICLES

      Finlayson, Simon; Paull, Allan; Acqware Pty Ltd; University of Queensland (International Foundation for Telemetering, 2005-10)
      Hypersonic test vehicles require extensive data acquisition in order to accurately determine and refine engine performance. The increasing speed of scramjet engines places new constraints on data manipulation and system control. A compact modular flight computer has been developed that has high speed analog data acquisition, a programmable high data rate PCM (Pulse Code Modulation) encoder, compact data storage, and high speed I/O (Input/Output) capabilities. Principle to the design is the thermal management required for space environments. A functional overview is presented together with a summary of the analog performance. The integration of future capability requirements is also discussed.
    • DYNAMIC RF LINK ESTIMATION FOR TELEMETRY SYSTEM OF LAUNCH VEHICLE, KSLV-I

      Kim, Sung-Wan; Hwang, Soo-Sul; Lee, Jae-Deuk; Korea Aerospace Research Institute (International Foundation for Telemetering, 2005-10)
      This paper presents the dynamic RF link estimation result for telemetry system of KSLV (Korea Space Launch Vehicle)-I. In particular, it utilizes the parameters of the instantaneous vehicle antenna gain pattern in three dimensions, the improvement by polarization diversity combiner at the ground receiver, and the free space propagation loss. The structural transformation and discontinuity of ground plane after the separation events of nose fairing, stage, and spacecraft, are also included in this analysis. As a consequence, the prediction of link variation has been performed in accordance with ARDP (Antenna Radiation Distribution Plot) and look angle trace of vehicle. In addition, the optimum position of onboard antennas has been investigated to provide better RF link margin in the nominal trajectory.
    • EXPERIMENTAL RESULTS FOR SPACE-TIME CODING USING ARTM TIER-1 MODULATION

      Nelson, Tom; Rice, Michael; Jensen, Michael; Brigham Young University (International Foundation for Telemetering, 2005-10)
      When using two antennas to transmit telemetry from an airborne platform, self interference results when both transmit antennae are visible to the receive antenna. This self interference can lead to link outages and severe distortion, especially as data rates increase above 5 Mbits/sec. Space-time coding can be used to provide transmit diversity to overcome this self interference problem. This paper describes the results of experiments (conducted at Edwards Air Force Base, California, USA) using FQPSK-JR waveforms coded with ARTM Tier-1 Space-Time Block Code.
    • PERFORMANCE ISSUES IN MIXING CELLULAR AND MANET FOR iNET

      Dean, Richard; Babalola, Olusola; Morgan State University (International Foundation for Telemetering, 2005-10)
      In the iNET community, communications between Test Articles (TA) and Ground Station (GS) can be over a long distance course that places a TA at ranges where they are sometimes beyond line-of-sight (LoS) or over-the-horizon communications with the GS. In other cases, the TA moves out of the LoS communications range of GS. There is a need to provide communications to these TA at these over-the-horizon locations. The Cellular and Mobile Ad Hoc Network (MANET) have attracted a lot of attention recently and the field continues to grow daily. The cellular network offers high capacity but limited in coverage due to its fixed base infrastructure. MANET on the other hand has a wide range of coverage and also high data rates, but its throughput performance is reduced at high capacity. The MANET cellular mixture network (MCMN) has been proposed to provide an extensive communications between the TA and GS in the iNET environment. This work presents a performance evaluation and analysis of the two different networks with respect to the performance needs of iNET environment which include coverage and throughput.
    • INTEGRATING THE JOINT ADVANCED MISSILE INSTRUMENTATION (JAMI) TIME SPACE POSITION INFORMATION (TSPI) UNIT (JTU) INTO A TELEMETRY SYSTEM

      Meyer, Steven J.; Naval Air Warfare Center Weapons Division (International Foundation for Telemetering, 2005-10)
      The Joint Advance Missile Instrumentation (JAMI) program has developed a Time Space Position Information (TSPI) unit (JTU). The JTU employs a novel use of Global Positioning System (GPS) technology, and inertial measurement units (IMU) to provide a real time trajectory for high dynamic missile systems. The GPS system can function during high g maneuvers that an air-to-air missile might encounter. The IMU is decoupled from the GPS sensor. The IMU data is a secondary navigation source for the JTU and will provide platform attitude. The GPS data and IMU data are sent to the ground in telemetry packet called TSPI Unit Message Structure (TUMS). The TUMS packet is sent to a computer that hosts the JAMI Data Processing (JDP) software, which performs a Kalmam filter on the GPS and IMU data to provide a real time TSPI solution to the range displays. The packetized TUMS data is available in three different output formats: RS-232 serial data, 16-bit parallel and PCM. This paper focuses on how to integrate the JTU into a telemetry system, use it as a standalone system, and provides examples of possible uses.
    • BEST SOURCE SELECTORS AND MEASURING THE IMPROVEMENTS

      Gatton, Tim; Wyle Laboratories Telemetry and Data Systems (International Foundation for Telemetering, 2005-10)
      After years of tracing the evolution and solutions to finding the best data, I learned that it isn’t best source selection that we all want. What we need is best data selection.
    • THE RISE OF INTELLIGENT DEVICES

      Drysch, Paul (International Foundation for Telemetering, 2005-10)
      Cellular networks are best known for the cell phones that they serve, but they also support a far larger – yet often overlooked – user base: machines with embedded intelligence that permits them to exchange specific information with other machines. Referred to as telemetry or machine-to-machine (M2M) communications, these devices and services cater to vending machines, truck trailers and utility meters, to name just a few common applications. M2M has been and will remain a growth market because it gives enterprises, government agencies and others a powerful way to cut costs, streamline their operations and improve their competitive position through real-time data dissemination.
    • AFRL/JWSD-1 DATA ARCHIVAL SYSTEM

      Self, Lance; Kirtland Air Force Base (International Foundation for Telemetering, 2005-10)
      Properly managing the volumes of data that are sent from satellites to the ground is becoming more important for a number of reasons. As more satellites are launched more data becomes available and there is a wealth of information contained within the data sets; information regarding the performance of the satellite subsystems, sensors, efficiency of autonomous software, and the accuracy of models and simulations to name a few. Proper storage and archival methods help ensure these data sets are available to scientists and engineers to discover previously unknown and “never before thought of” relationships between systems or subsystems. The most obvious “first step” in this process is to preserve the data for work that may lead towards new discovery and future advances. AFRL is committed to preserving these data sets for these and other stated reasons. This paper describes one ongoing effort related to the Joint Warfighting Space Demonstration 1 (JWSD-1) (aka RoadRunner) satellite program that archives all the data sent to the ground and makes that data available via the Internet to concerned groups of users.
    • REAL-TIME TELEMETRY ON A PC

      Smith, Dan; Steele, Doug; L-3 Communications (International Foundation for Telemetering, 2005-10)
      Near real-time telemetry acquisition, processing and analysis on a desktop PC have always been difficult. Many factors complicate working with real-time data, including operating system latencies, design inefficiencies and hardware limitations. These problems are further compounded when data from multiple sources had to be integrated, increasing design complexity. Current design solutions for analyzing data in near real-time now utilize the latest hardware implementations and software designs, taking advantage of new hardware and language features. This paper will discuss several issues found with PC-based telemetry systems and how new designs are addressing these issues.
    • A MULTIPLEXER/RECORDER ARCHITECTURE FOR USE WITH CONVENTIONAL MEDIA TECHNOLOGY

      Berdugo, Albert; Teletronics Technology Corporation (International Foundation for Telemetering, 2005-10)
      Instrumentation recorders have evolved continuously over the years. Their growth has primarily been driven by technology advancements. The latest recording equipment generally utilizes hard disk, disk array, or solid-state storage technology, which results in greater capacity and performance. Most recorders integrate storage media with multiplexer electronics resulting in a highly efficient yet inflexible and physically large recording system. This paper describes an instrumentation multiplexer/recorder system using an open architecture between the multiplexer and the storage media that allows insertion of conventional recording technologies. This approach provides a generalized solution with enough flexibility and scalability to address the majority of instrumentation recording needs. This system is based on the latest IRIG-106 chapter 10 standard, thus supporting interoperability throughout the flight test community.
    • AN IMPLEMENTATION OF A COMPLETE XML SYSTEM FOR TELEMETRY SYSTEM CONFIGURATION

      Portnoy, Michael; Teletronics Technology Corporation (International Foundation for Telemetering, 2005-10)
      Creating a generic, multi-vendor data exchange system for transmitting telemetry configurations between various systems is a daunting task. To date many different systems have been proposed including relational databases (RDBMS), TMATS, and several different XML schemas. Although many of these systems have been implemented, a complete, flexible solution has not been developed. This paper describes an implementation that is currently in use for exporting and importing a complete telemetry system via XML. Using this system, an engineer can import an entire telemetry configuration, a partial telemetry configuration, or even just a single measurement (parameter). As a result, the gap between user database systems and the airborne instrumentation vendor’s configuration software (IVCS) is seamlessly bridged. This provides many benefits including: the ability to rapidly change configurations, data entry error avoidance, version control, the protection of sensitive information, and configuration reusability. This system allows for the configuration of all aspects of the telemetry setup including data acquisition hardware, transmitters, ground stations, and recorders. In addition, the recorder settings and the definition of the data that are to be recorded are coupled and linked to the rest of the telemetry configuration, which facilitates future data recovery.
    • TRENDS IN COTS STORAGE SOLUTIONS FOR DATA ACQUISITION SYSTEMS

      Tsur, Ofer; M-Systems (International Foundation for Telemetering, 2005-10)
      This paper discusses data storage requirements for data acquisition systems, and evaluates the ability of three of the most popular COTS data storage solutions - mechanical disk, ruggedized mechanical disk and solid-state flash disk - to meet these requirements today and in the future. It addresses issues of capacity, data reliability, endurance, form factor, cost and security. It concludes with a discussion of trends to implement high-speed serial interfaces in data acquisition systems, and the challenges that these trends pose for COTS storage solutions.
    • A LOOK AT CELLULAR PACKET DATA PERFORMANCE FOR APPLICATION IN iNET

      Dean, Richard; Webley, Kayonne; Morgan State University (International Foundation for Telemetering, 2005-10)
      The integrated Network Enhanced Telemetry (iNET) environment is meant to build and improve on the existing unidirectional legacy telemetry links. The optimized network would have to be capable of providing bi-directional, spectrally efficient, reliable, dynamically allocated, real time or near real time access to video and other types of test data over a shared bandwidth, high capacity network. Developed specifically for providing a reliable means of communications for large numbers of users, cellular technology seems particularly suited to addressing iNET’s needs. This paper investigates the creation of a cellular model for enhanced throughput for data users wherein a user would dynamically be allocated high data rates dependent on parameters such as the received signal to noise ratio (SNR). Our future work will develop the average data performance, comparing both the time division multiple access (TDMA) and code division multiple access (CDMA) environments for potential application in iNET.
    • A FLEXIBLE DATA ACQUISITION, CONTROL AND TELEMETRY SYSTEM FOR EXPERIMENTAL PAYLOADS

      Wilkins, Bryce; Erwin, Daniel A.; University of Southern California (International Foundation for Telemetering, 2005-10)
      Experimental science payloads vary greatly in design for the purpose of performing specialized tasks. As such, their supporting control, data acquisition and telemetry subsystems are often expensive custom designed units with specific abilities, thus limiting reuse. This paper presents a payload control, data acquisition and telemetry system capable of providing a range of functionality to science payloads as a consequence of its accommodating architecture, programmability, and physical modular design. Details of the system and its capabilities are presented followed by an actual configuration of the system as the backbone of a micro-electro-mechanical-systems technology demonstration payload designed for suborbital flight.
    • A Low Cost TDRSS Compatible Transmitter Option

      Whiteman, Don; National Aeronautics and Space Administration (International Foundation for Telemetering, 2005-10)
      The NASA Space-based Telemetry and Range Safety (STARS) program has developed and tested a low cost Ku-Band transmitter alternative for TDRSS applications based on an existing IRIG shaped offset quaternary phase shift keying (SOQPSK) transmitter. This paper presents information related to the implementation of this low cost system, as well as performance measurements of the alternative TDRSS transmitter system compared with an existing QPSK TDRSS transmitter.
    • DESIGN OF A SOFTWARE RADIO GPS RECEIVER

      Zhengxuan, Zhang; Yanhong, Kou; Qishan, Zhang; Beihang University (International Foundation for Telemetering, 2005-10)
      The GPS receiver based on software radio technology is a kind of general purpose GPS signal processing platform which makes use of advanced design ideas and advanced design tools nowadays. We used FPGA device and lots of necessary peripherals such as DSP and PCI controller in our design to promote flexibility and practicability effectively. Various fast acquisition means and accurate tracking algorithms could be realized, improved and validated on this platform, besides basic GPS receiver function.
    • SEA SURFACE SCATTERED GPS SIGNAL DETECTION AND APPLICATION

      Yi-qiang, Zhang; Qi-shan, Zhang; Dong-kai, Yang; Bo-chuan, Zhang; Rong-lei, Hu; Zi-wei, Li; BeiHang University; Beijing Spatial Port Geosystems Co. (International Foundation for Telemetering, 2005-10)
      Background and advantages of GPS based Remote Sensing are introduced, characteristics of forward scattered GPS signal such as polarization change, cross-correlation power variation, code delay due to the wave travel distance difference between direct and scattered signal, and cross-correlation power expansion due to sea surface roughness are discussed in detail. Working principle of the self-developed delay-mapping receiver is also presented. First data collection campaign is done at Inshore of BOHAI ocean with the delay-mapping receiver mounted on an airplane. Results show that the reflected signals has much variation than the direct signals, the code delay of the reflected signals varies as the receiver height and satellite elevation angle changes and expansion of the cross-correlation due to the wind driven surface was also demonstrated.
    • OPTIMAL ENERGY-DELAY ROUTING PROTOCOL WITH TRUST LEVELS FOR WIRELESS AD HOC NETWORKS

      Jagannathan, S.; Miller, Ann; Taqieddin, Eyad; University of Missouri-Rolla (International Foundation for Telemetering, 2005-10)
      An ad hoc network is a group of wireless nodes which do not rely on any fixed infrastructure. Hosts cooperate by forwarding packets for each other to communicate with nodes that are out of the radio transmission range. We propose a new routing algorithm that is based on the concept of multipoint relay nodes (MPR). The main focus of the Trust Level Routing protocol is the reliability and survivability of the network by applying costs to each MPR candidate. The cost calculation is based on the delay incurred, energy available at the MPR node, energy spent during transmission and number of packets sent on each link. We highlight the vulnerabilities in current link state routing algorithms and propose the use of light weight encryption algorithms to achieve a dependable routing algorithm. Network simulator (ns-2) is used to compare the protocol performance to other existing link state routing protocols.