• TELEMETRY SYSTEMS DESIGN TO SUPPORT THE AUSTRALIAN DEFENSE FORCE AT THE EAST AUSTRALIA (JERVIS BAY RANGE) AND OTHER LAND OR OPEN OCEAN EXERCISE LOCATIONS

      Bennett, Wayne; Peterson, Dwight M.; Naval Warfare Assessment Station; Royal Australian Navy (International Foundation for Telemetering, 2000-10)
      The Royal Australian Navy (RAN) Sonar and Ranges Group (S&RG) office has a requirement to provide a dual weapon capable Mobile Missile Telemetry Range (MMTR) and data analysis system to upgrade their Jervis Bay Range telemetry ground station for supporting at-sea testing of air and surface launched guided weapon, decoy, and target systems. This paper describes the design and development of the MMTR and data analysis system used to support the Jervis Bay Range and the acquisition strategy used to procure the system. Unique design features of the MMTR system include a dual use packaging scheme which permits the system to be transported to any suitable land based location or deployed as two independent shipboard telemetry receiving systems. In addition, the paper describes antenna, receiver, recording, matrix switching, processing, display, and communication subsystem components used within the MMTR system.
    • UTTR BEST TELEMETRY SOURCE SELECTOR

      Rigley, Kenneth H.; Wheelwright, David H.; Fowers, Brandt H.; Hill Air Force Base (International Foundation for Telemetering, 2000-10)
      The UTTR (Utah Test & Training Range) offers the largest over land test and training airspace in the continental United States. It provides excellent telemetry data processing capability through a number of TM (telemetry) sites. Selecting the best source of telemetry data for optimum coverage from these many sites can be very involved and challenging for ground station personnel. Computer-based best source selection automates this process, thereby increasing accuracy and efficiency. This paper discusses the capabilities of the BTSS (Best Telemetry Source Selector), its background, design and development, applications, and future at the UTTR.
    • ULTRA HIGH BIT RATE (UP TO 1GBIT/S) BANDWIDTH EFFICIENT FQPSK ALL-DIGITAL MODULATOR/DEMODULATOR ARCHITECTURES AND NASA IMPLEMENTATIONS

      Ghuman, Parminder; Koubek, Steve; Winkert, Tom; Gray, Andrew; Lay, Norm; Yan, Tsun-Yee; National Aeronautics and Space Administration; California Institute of Technology (International Foundation for Telemetering, 2000-10)
      The paper presents ongoing efforts at NASA’s Goddard Space Flight Center and the Jet Propulsion Laboratory to develop ultra high bit rate bandwidth efficient FQPSK modulators and demodulators. The ability to transmit and receive ever-increasing amounts of extremely high rate data is an enduring challenge in the arena of near-earth space borne science missions. Reliable and efficient transmission of information at these data rates requires the use of power and bandwidth efficient modulations that exhibit low transmitter, receiver, and decoder complexity. Conventional high rate approaches for achieving spectral limiting typically employ sharp post amplifier filtering at the transmitter to limit the interference to the adjacent bands. However, using analog filtering alone can produce substantial intersymbol interference and other distortions that substantially affect the detection performance of the signal. In contrast, various theoretical classes of modulation waveforms can be tailored to provide varying degrees of bandwidth and power efficiency or robustness to non-linear transmitter distortions while incurring little or no performance losses. In order to realize many of these signal types, precise amplitude and phase control over the synthesis of these signals is required, typically necessitating the use of digital signal processing.
    • ENHANCED PERFORMANCE OF FQPSK-B RECEIVER BASED ON TRELLIS-CODED VITERBI DEMODULATION

      Lee, Dennis; Simon, Marvin; Yan, Tsun-Yee; Jet Propulsion Laboratory (International Foundation for Telemetering, 2000-10)
      Commercial FQPSK-B receivers traditionally use symbol-by-symbol detection and have a 2 dB Eb=No loss relative to ideal QPSK at a bit error rate (BER) of 10^(-5). An enhanced FQPSK-B receiver using a Viterbi algorithm (VA) to perform trellis decoding is simulated and shown to have a 1.2 dB Eb=No improvement over symbol-by-symbol detection for 10^(-5)5 BER at the cost of increased complexity. A simplified Viterbi receiver with a reduced trellis and significantly less complexity is introduced with only a slight BER degradation compared to the full Viterbi receiver. In addition, a theoretical bit error probability expression for the symbol-by-symbol FQPSK-B receiver is derived and compared with simulation results.
    • HOW TO USE RBDS TO TRANSMIT DGPS CORRECTION MESSAGE

      Shengxi, Ding; Qishan, Zhang; Junfeng, Li; Dayi, Zheng; Beijing University of Aeronautics and Astronautics; Chongqing Bashan Instrumental Factory (International Foundation for Telemetering, 2000-10)
      This paper introduces the frequency spectrum characteristic of FM radio broadcast and the message format of RBDS (Radio Broadcast Data System). DGPS correction message in RBDS is described in detail. A design method of RBDS/DGPS system is proposed and the RBDS/DGPS system developed by us is introduced. Finally, some special advantages of RBDS/DGPS system are given.
    • IMPROVING PERFORMANCE OF SINGLE OBJECT TRACKING RADAR WITH INTEGRATED GPS/INS

      Singh, Mahendra; McNamee, Stuart; Navarro, Rick; Fleishans, Amy; Garcia, Louie; Khosrowabadi, Allen; Waddan Systems; Air Force Flight Test Center; White Sands Missile Range; TYBRIN Corporation (International Foundation for Telemetering, 2000-10)
      A novel approach combines GPS receiver technology with micro-electromechanical inertial sensors to improve performance of single object tracking radar. The approach enhances range safety by integrating an airborne Global Positioning System/Inertial Movement Unit (GPS/IMU) with a C-band transponder to downlink time-space-position information (TSPI) via FPS-16 instrumentation radar. This improves current telemetry links and the Range Application Joint Program Office (RAJPO) data link for downlinking TSPI because of the inherent long-range advantage of the radar. The goal of the project is to provide distance independent accuracy, and to demonstrate continuous 15-meter or better position accuracy over the entire flight envelope out to slant ranges up to 1,000 Km with at least 50 updates per second. This improves safety coverage for the wide area flight testing. It provides risk reduction for the Air Force Flight Test Center (AFFTC), Edwards Air Force Base, California and other ranges planning TSPI system upgrades.
    • ON THROUGHPUT ANALYSIS OF THE MARS IN-SITU ARQ PROTOCOL

      Liang, Robert; Kwan, Bruce; Florens, Cedric; Jet Propulsion Laboratory (International Foundation for Telemetering, 2000-10)
      Combating harsh and unpredictable channel environments is a part of the design of any in-situ communication system (i.e. rover to lander, rover to orbiter, etc.). Channel characteristics can range from simple additive white Gaussian noise (AWGN) channels to more bursty fading channels found in rover to orbiter links (i.e. canyon scenarios and typical orbiter passes around mountain ranges). A combination of forward error correction and automatic repeat request (ARQ) schemes are commonly used to provide a more robust communications link. ARQ enhances the communication link particularly for bursty fading channels. Go-Back-N is a commonly used ARQ scheme and is an option in the newly developed Consultative Committee for Space Data Systems (CCSDS) Proximity-1 Link protocol [7], a data link layer protocol targeted specifically for in-situ applications. Optimization of frame sizes and retransmission persistence of the ARQ scheme require a good analytical model of how the scheme performs over various channel conditions. In this paper, an analytical framework for modeling the COP-1 protocol is presented for both AWGN channels along with bursty fading channels. A Gilbert-Elliot two-state Markov model is used to model a bursty fading channel.
    • A MODULAR APPROACH TO LANDSAT 7 GROUND PROCESSING

      Mah, G. R.; Pater, R.; Alberts, K.; O’Brien, M.; Senden, T.; Raytheon (International Foundation for Telemetering, 2000-10)
      Current Landsat 7 processing is based on a single-string, multifunction approach. A follow-on system has been designed that repartitions functions across multiple hardware platforms to provide increased flexibility and support for additional missions. Downlink bit stream acquisition has been moved to lower cost systems functioning as “capture appliances” with high-speed network interconnections to Level 0 processing on generic compute servers. This decouples serial data stream acquisition from the processing system to allow the addition or replacement of compute servers, without the reintegration of specialized high-speed capture hardware. Moreover, it also allows the easy integration of new systems and missions without extensive system redesign or additional software.
    • IMPROVING THE DETECTION EFFICIENCY OF CONVENTIONAL PCM/FM TELEMETRY BY USING A MULTI-SYMBOL DEMODULATOR

      Geoghegan, Mark; Nova Engineering Inc. (International Foundation for Telemetering, 2000-10)
      Binary PCM/FM has been widely adopted as a standard by the telemetry community. It offers a reasonable balance between detection efficiency and spectral efficiency, with very simple implementation in both the transmitter and receiver. Current technology, however, allows practical implementations of more sophisticated demodulators, which can substantially improve the detection efficiency of the waveform, with no changes to the modulator. This is accomplished by exploiting the memory inherent in the phase continuity of the waveform. This paper describes the implementation and performance of a noncoherent multi-symbol demodulator for PCM/FM. Sensitivity to offsets in carrier frequency, timing, and modulation index is also examined. Simulation results are presented which demonstrate improvements in detection efficiency of approximately 2.5 dB over traditional noncoherent single symbol detectors.
    • HARDWARE DOWNLOADABLE MULTI-FUNCTION TELEMETRY INPUT MODULE

      Nicolais, Ray; Nicolo, Stephen J.; Snyder, Ed; GDP Space Systems (International Foundation for Telemetering, 2000-10)
      This paper describes a Multi-Function Telemetry Input Module (TIM). The TIM module includes a 30 Mbps PCM frame synchronizer, a time code translator/generator, a PCM simulator and a tunable bit synchronizer all on a single PCI card. The module uses a generic architecture including: high density Field Programmable Gate Arrays (FPGAs), look-up table memory, dual port A/B data buffer memory and a full function PCI interface. The FPGA and the logic function of the card are downloadable via the PCI interface. This allows a single module to support many hardware functions in a telemetry front-end. The TIM is an integral part of a PC-based Advanced Telemetry Processing and Display System. This concept for hardware design ushers in a new generation of flexible downloadable telemetry products.
    • THE REALIZATION OF A NEW AVLNS BASED ON WINDOWS CE

      Wenzheng, Zhang; Xianliang, Li; Qishan, Zhang; Beijing University of Aeronautics and Astronautics (International Foundation for Telemetering, 2000-10)
      There is an increasing demand for practical and powerful navigation system to lead people from one place to another quickly and rightly. The introduction of a new embedded operating system, Windows CE, allows us to design a compact, low-cost, efficient autonomous vehicle location and navigation system. This paper discusses the advantages of Windows CE, demonstrates the possibility of building an AVLNS based on it. Then a realization scheme of hardware platform and navigation software is presented.
    • ADVANCED TELEMETRY PROCESSING AND DISPLAY SYSTEM (ATPDS)

      Leichner, Ted; Nicolo, Stephen J.; Snyder, Ed; Stacy, Mark; Ziegler, Charles; GDP Space Systems (International Foundation for Telemetering, 2000-10)
      This paper describes a PC-based Advanced Telemetry Processing and Display System (ATPDS)- a highend, real-time telemetry processing and display system implemented on a COTS PC platform. for A network-centric architecture was chosen from candidate architectures as the most viable for the ATPDS. The network-centric architecture is Windows NT-based, client/server based, supporting clients and servers on both local or remote PC workstations. The architecture supports distributing processing loads across multiple workstations, optimizing mission processing requirements. The advantage of this system is its flexibility and expandability with low acquisition and life-cycle support costs. The ATPDS allows the user to configure one or more small systems into a larger high-end system based on varying mission requirements.
    • A COMMERCIAL OFF THE SHELF CONTINUOUSLY TUNABLE HIGH DATA RATE SATELLITE RECEIVER

      Varela, Julio; Conrad, Robert; TSI TelSys, Inc. (International Foundation for Telemetering, 2000-10)
      TSI TelSys, Inc. is in the process of developing a production level, continuously tunable satellite receiver designed to support multiple high data rate, low earth and geostationary orbit missions in the 20 Mbps to 800 Mbps composite QPSK data rate range. This paper will evaluate market demands on satellite receivers and outline receiver design technique as a solution to high rate, multi-mission support.
    • ANTENNA CONTROL FOR TT&C ANTENNA SYSTEMS

      Kaiser, Julius A.; Herold, Fredrick W.; Fredrick Herold and Associates, Inc. (International Foundation for Telemetering, 2000-10)
      A thinned array sensor system develops error voltages for steering dish antennas from signals arriving over a broad range of angles, thereby eliminating need for a priori knowledge of signal location.
    • STUDY ON HIGH-RATE TELEMETRY DATA REAL-TIME PROCESSING TECHNIQUES

      Chun, Yang; Hongling, Yang; Jie, Zhou; Xinan Electronic Engineering Institute (International Foundation for Telemetering, 2000-10)
      Owing to rapid development of PC industry, personal computer has been surprisingly improved on reliability and speed and it has been applied to many fields, such as aerospace, satellite and telemetry applications. As we all known, two aspects decide how fast the PC-based data acquisition can be reached. One aspect is CPU processing and the other is I/O bandwidth. Indeed, the first aspect has changed increasingly insignificant because the frequency of CPU has exceeded 700MHz which can satisfy fully the need of high rate data processing. So I/O bandwidth is the only key factor of the high rate PC-based data acquisition and we must adopt efficient data buffer techniques to satisfy the demand of telemetry data entry. This paper presents a buffered data channel which use memory mapping, EPLD and Dual-Port SRAM techniques. The operation platform of this design is WINDOWS95/98 and the software includes device driver and real-time processing routines.
    • EVALUATION OF GPS RECEIVER PERFORMANCE UNDER HIGH DYNAMIC CONDITIONS

      Cunningham, James P.; Khoe, Paula K.; Hermann, Bruce R.; Evans, Alan G.; Merts, John H.; Naval Surface Warfare Center Dahlgren Division; USAF Air Armament Center (International Foundation for Telemetering, 2000-10)
      Global Positioning System (GPS) sensors have the potential to provide precise position, velocity, and timing information in high dynamic applications. Missile flight-testing is one such application where accurate relative positions are important. GPS instrumentation can provide the high accuracy while offering both significant cost savings and improved confidence in the test results when compared to existing methods. To date, the use of GPS in missile flight-testing has been limited due to a lack of demonstrated GPS receiver tracking capability in high dynamics. This paper evaluates several currently available GPS receivers for both their tracking capability and their measurement accuracy in high dynamic environments.
    • SUBMINIATURE GPS INERTIAL TIME SPACE POSITION INFORMATION

      Khosrowabadi, Allen; Gurr, Richard; Fleishans, Amy; TYBRIN Corporation; Air Force Flight Test Center (International Foundation for Telemetering, 2000-10)
      In the past few years, GPS has proven itself as an effective source of time space position information (TSPI) data for air vehicles. Currently, GPS truth systems are used to track aircraft ranging from low dynamic vehicles to high dynamic fighters. However, low-cost GPS TSPI instrumentation is not currently available for stores and weapons delivered by air vehicles. To date, data is collected by tracking dropped items using radar or optical means. This process is costly and time consuming. The purpose of this project is to leverage the recent advances in micro-electromechanical systems (MEMS) technology to develop a subminiature, inexpensive, low power, disposable telemetrytransmitting package. The purpose of this transmitting package is to up-link the GPS positional data from the weapon or store to the host aircraft. This data is then retransmitted by the host aircraft to a ground station and/or recorded on board for post processing. The transmission of the data to the host aircraft can provide near real- time position data for the released object. The transmitting package must have a unique identification method for application in tracking multiple objects. Since most of the systems used in weapons testing will be destroyed, it is extremely important to keep the development and maintenance cost low. In addition, the package must be non-intrusive to avoid any significant modification to the weapon and to facilitate quick instrumentation of the weapon for test and evaluation.
    • TIME SYNCHRONIZATION IN FLIGHT TEST DATA ANALYSIS

      Von Zuben, Francis S. G.; David, Alfred S., Jr.; Lockheed Martin Aeronautics Company; Computer Sciences Corporation (International Foundation for Telemetering, 2000-10)
      A recurring problem in flight testing navigation systems is the need for an accurate, common time reference for the system under test and for the truth source to which it is compared. Lockheed Martin Aeronautics Company and Computer Sciences Corporation have developed software that utilizes all available timing information to reference the times of validity for each navigation measurement to Coordinated Universal Time. This permits accurate comparison and correlation of data necessary for statistical error analysis of the navigation system.
    • PHASE CENTER MEASUREMENTS FOR A WRAP-AROUND GPS ANTENNA

      Meyer, Steven J.; Kujiraoka, Scott R.; Naval Air Warfare Center Weapons Division (International Foundation for Telemetering, 2000-10)
      Global Positioning System (GPS) technology is being used as a sensor in telemetry systems to provide time, space and position information (TSPI) as well as end game or vector scoring. The accuracy of these measurements depends on precisely locating the phase center of the GPS antenna. A procedure has not currently been addressed by anyone to measure the phase center of a conformal wrap-around GPS antenna. This paper will discuss some techniques on determining the antenna phase center.
    • INVESTIGATION OF TELEMETRY AND GPS COMPATIBILITY

      Law, Eugene; Kingery, Ronald; Cramer, Dave; NAWCWD; Evolving Resources Inc. (International Foundation for Telemetering, 2000-10)
      Several test programs have reported degraded Global Positioning System (GPS) performance when L-band (1435-1535 MHz) telemetry is used while other test programs have had acceptable GPS performance with L-band telemetry. Most test programs seem to have minimal problems with S-band telemetry interfering with GPS performance if a bandpass filter is used between the GPS antenna and the low noise amplifier (LNA). This paper will present measured data on GPS performance with L- and S-band telemetry and explain what must be done to minimize interference to GPS. The paper will present both GPS signal-to-noise ratio (S/N) values as well as measured spectra from telemetry transmitters. System design guidelines for compatible operation will be presented.