• GPS SOLVES THE COMBAT PILOT TRAINING RANGE PROBLEMS

      Hoefener, Carl E.; Wechel, Robert Van; Interstate Electronics Corporation (International Foundation for Telemetering, 1990-11)
      For more than 20 years combat pilot training instrumentation has taken place on Air Force and Navy TACTS/ACMI ranges. The original ranges were designed to instrument a cylinder in space 30 miles in diameter from 5,000 feet to 55,000 feet and to handle up to eight participants. As fighter combat techniques have advanced and battle tactics have been revised to take into account more advanced weapons systems, the capabilities of the existing ranges have become extremely taxed. For example, modifications have been added on to the original systems so that the tracking altitude could be lowered to 100 feet (by adding radar altimeters to the instrumentation pods); the number of participants could be increased to 36 (by lowering the system sample rates), and the range area could be expanded (by increasing the number of ground tracking sites required from seven to a dozen or more). Clearly these were bandaid fixes, and the total capability of the ranges suffered, but since no satisfactory alternate systems were available, these systems continue to be used. During the past twenty years, however, significant advances have taken place in all areas of instrumentation system technology. By the application of modern technology, a new generation of air combat training ranges cm be made available that will greatly enhance the training capability of our armed forces and will be capable of training them in the new tactics required by the fighter weapons systems of the future. Among these training advantages will be the following capabilities: ! Tracking over an entire 25,000-square-mile or larger range area. ! Precision tracking of up to 100 participants. ! Tracking of all vehicles from ground level to 100,000-foot altitude. ! Only a few nonsurveyed portable groundsites will be required. ! An unlimited number of portable unmanned threat emitters can be provided at a fraction of the cost of existing threats. ! The entire range can be made portable. ! Modern display capability will greatly enhance pilot recall ability required for mission debriefing. By applying GPS, optimizing the datalinks, and restructuring the range design concept, these advantages can be realized. This paper discusses the application of modern range system technology to the design of the TACTS/ACMI ranges of the future.
    • COMPUTER CONTROLLED TELEMETRY RECEIVE AND RECORD SYSTEM

      Law, Eugene L.; Pacific Missile Test Center (International Foundation for Telemetering, 1990-11)
      This paper will describe the Pacific Missile Test Center’s (PMTC) approach to a computer controlled telemetry receive and record system. The advantages of this system include: fast, accurate equipment setup and interconnection, automatic verification of operational status, and simplified signal monitoring. PMTC personnel developed the system architecture and software. The system hardware is all unmodified off-the-shelf equipment. The main design drivers were cost, reliability, and minimizing the effect of any single point failure. The system uses many individual switches instead of a small number of large switch matrices. Manual patching capability has been maintained. This patching system provides a backup solution if all the computers get “zapped”. The patching system also provides increased signal routing flexibility.
    • Chinese Development on Aero-space Telemetry Ground Station

      Chang-jie, Shi; The Ministry of Aero-space Industry P.R.C. (International Foundation for Telemetering, 1990-11)
      This paper introduces the systematic design features of development of Chinese aero-space telemetry ground station from the following seven respects: 1. The fundamental factors to promote the 1980s’ development of telemetry ground station. 2. Increasing the flexibility of telemetry ground station. 3. The approach of one-time system design and multisteps development. 4. Decreasing the effect and influence of host computer. 5. Increasing the efficiency of buses. 6. To pay attention to magnetic recorder. 7. According to realistic utility to determine the configuration and specification of telemetry ground station.
    • TIMELY UPGRADES TO COMPLEX SYSTEMS SUCH AS THE TELEMETRY PROCESSING SYSTEM AT PMTC

      Reed, Gary; DeVries, James; Computer Sciences Corporation; Pacific Missile Test Center (International Foundation for Telemetering, 1990-11)
      The procurement of a new or upgraded data processing system doesn’t have to take eons of time and result in a less than adequate system. The complexity of requirements definition and system development are not getting any easier, but well-defined methodologies and the use of proven capabilities are providing a means of controlling the process. Even though there are more and more demands being placed on telemetry processing systems and advancing technology offers a myriad of solutions from which to choose, the Government and contractor communities are becoming more effective in applying techniques to define and deliver adequate systems. One method of demonstrating this is to describe an example of a complex telemetry processing system currently being developed for the Navy.
    • IMPLEMENTATION AND USAGE OF THE RJ PROGRAM DATA ACQUISITION SYSTEM GROUND STATION

      Quart, Barry; Mitchell, Rick; Bombardier Inc.; Loral Data Systems (International Foundation for Telemetering, 1990-11)
      The Data Acquisition System Ground Station (DASGS) is a system developed by Loral Data Systems (Loral) for CANADAIR Aerospace Group. The system implements the latest technologies in telemetry front-end equipment, host computers, networking, and graphic workstations. The goal of the DASGS is to supply Canadair with a telemetry acquisition and processing system that can satisfy the Regional Jet (RJ) program requirements and provide future expandability to service their needs throughout the 1990’s. This paper will address three aspects of this telemetry system. First, the telemetry data processing requirements of the RJ program will be described. Second, the system architecture, both hardware and software, will be discussed and the basis for the architecture. The third topic of this paper will cover how the system processing capability can be increased to satisfy Canadair’s future requirements.
    • ARCHITECTURAL CONSIDERATIONS FOR A GENERIC MULTI-PORT DIGITAL INTERFACE

      CHIMENE, MARK C.; ROCKWELL INTERNATIONAL MISSILE SYSTEMS DIV. (International Foundation for Telemetering, 1990-11)
      Telemetry system requirements are driven by technological developments in other areas, thus the capabilities of one are mirrored in the capabilities of the other. Contemporary systems typically involve two or more digital subsystems, each operating at a unique clock rate; an increase in complexity that needs to be addressed by the Telemetry system designer. Although the subsystems may be exchanging information, complete synchronization is seldom realized in discrete systems. Because the Telemetry system must provide information sufficient to isolate data/process corruption, it must accept data from the various subsytems at different rates and times. What is needed is a technique to de-couple the Telemetry system clock rate from that of the Subject system or any of its subsystems. This technique must bridge the gap between the synchronous data transmission fundamental to the Telemetry system and the asynchronous data transfer required by the various non integrated subsystems. This paper will discuss the design challenges offered by such a Subject system for both real time and post flight analysis. It will discuss how the restrictions imposed by the IRIG standards and anticipated mission requirements factored into developing the architecture for a Generic Multi-Port Digital Telemetry Interface.
    • TELEMETRY PREPROCESSOR PERFORMANCE

      Thom, Gary A.; Aydin Computer and Monitor Division (International Foundation for Telemetering, 1990-11)
      Today there are a number of equipment vendors offering modular, bus oriented Telemetry Preprocessor systems. The architecture of these systems varies greatly as does the actual performance. This paper discusses a method for specifying and evaluating Telemetry Preprocessor performance independent of the architectural implementation.
    • AN/MPS-39 MULTIPLE OBJECT TRACKING RADAR: MTI VARIANT

      Stegall, Ralph L.; Stephens, Bobby C.; Government Electronic Systems Division (International Foundation for Telemetering, 1990-11)
      The AN/MPS-39 Multiple Object Tracking Radar (MOTR) is a new precision instrumentation system designed to support range safety, weapon development, operational test and evaluation, and training exercises involving multiple participants. A coherent MTI (moving target indicator) variant, the subject of this paper, has been developed for MOTR using discretionary IR&D funds. A zero recurring cost “softwareonly” version of this MTI variant has been successfully tested. The architecture for a low-cost hardware adjunct designed to increase MTI detection range and simultaneously provide clutter-suppressed operator displays has also been developed. In this paper, a brief description of MOTR is given and its adaptability to three-pulse MTI is presented, along with expected performance results. The implementation of the MTI software only version is described in some detail and the results of tests are shown. The hardware adjunct is briefly described. Possible applications of this variant are cited and future directions MOTR coherent real-time processing can take are given.
    • Digital Signal Processing Techniques Used to Demodulate Multiple Types of Telemetry Data

      Ziegler, Frank A.; Microdyne Corporation (International Foundation for Telemetering, 1990-11)
      Telemetry systems today are required to receive a variety of modulation formats. Typically, to change the format required changing the demodulator unit or large switching systems. Using some common digital building blocks and multiplexers, the user can change demodulation mode by pressing a button. This paper describes a system that demodulates PM, FM, BPSK, QPSK and DSB AM.
    • A NEW 1553 ALL-BUS INSTRUMENTATION MONITOR

      Berdugo, Albert; Ricker, William G.; Aydin Vector Division (International Foundation for Telemetering, 1990-11)
      Increased data throughput demands in military and avionics systems has led to the development of an advanced, All-Bus MIL-STD-1553 Instrumentation Monitor. This paper discusses an airborne unit which acquires the information from up to 8 dual-redundant buses, and formats the data for telemetry, recording or real-time analysis according to the requirements of IRIG-106-86, Chapter 8. The ALBUS-1553 acquires all or selected 1553 messages which are formatted into IRIG-compatible serial data stream outputs. Data is time tagged to microsecond resolution. The unit selectively transmits entire or partial 1553 messages under program control. This results in reduced transmission bandwidth if prior knowledge of 1553 traffic is known. The ALBUS also encodes analog voice inputs, discrete userword inputs and multiplexed analog (overhead) inputs. The unit is provided in a ruggedized airborne housing utilizing standard ATR packaging,
    • ON-BOARD DATA ACQUISITION SYSTEM FOR EMBRAER’S CBA123

      Penna, Sergio Duarte; EMBRAER - Flight Test Division (International Foundation for Telemetering, 1990-11)
      The 90’s will be a challenge to many industries, but in particular to airframe manufacturers like EMBRAER that wish to grow up on a solid basis not only for this decade, but also for the next one. This paper describes the requirements of the on-board data acquisition system and alternatives proposed for the EMBRAER’s new 19-seat, twin engine turbo prop commuter aircraft, the CBA-123.
    • INVESTIGATION OF CHIRP INTERFERENCE ON M-FSK DEMODULATION USING RAC

      Ng, Wai-Hung; Leung, Tony; The Aerospace Corporation (International Foundation for Telemetering, 1990-11)
      Recently, many satellite systems started to employ reflective-array compressor (RAC) to demodulate their M-FSK communication signals. Because the RAC’s time delay varies with the temperature, pilot-tones are usually introduced as the operational reference. In this paper, the basic chirp Fourier transform (CFT) is briefly reviewed. Then, investigation into possible pilot-tone interference caused by various chirp signals with RAC’s dispersive delay properties is presented and discussed.
    • Telemetry Format Compiler for the Generation of State machine Code Executed by a PCX Encoder

      Landry, Michael; Loral Conic (International Foundation for Telemetering, 1990-11)
      Telemetry encoders commonly use programmable memory devices for the storage of data used to control the multiplexed output format. The manual generation of this program control information is tedious and error prone. A telemetry format compiler has been developed to automate this process. A high level definition of the format information is processed to result in a binary object file which is programmed into the memory of the encoder and executed by the state machine controlling the encoding.
    • A PREDICTABLE PERFORMANCE WIDEBAND NOISE GENERATOR

      Napier, T. M.; Peloso, R.A.; Aydin Computer and Monitor Division (International Foundation for Telemetering, 1990-11)
      An innovative digital approach to analog noise synthesis is described. This method can be used to test bit synchronizers and other communications equipment over a wide range of data rates. A generator has been built which has a constant RMS output voltage and a well-defined, closely Gaussian amplitude distribution. Its frequency spectrum is flat within 0.3 dB from dc to an upper limit which can be varied from 1 Hz to over 100 MHz. Both simulation and practical measurement have confirmed that this generator can verify the performance of bit synchronizers with respect to the standard error rate curve.
    • Optical Communication in Space A Challenge to Microwave Links

      Mayer, Gerhard; Franz, Jürgen; Applied Data Systems Division; Institute for Communication Technologies (International Foundation for Telemetering, 1990-11)
      Laser communications offer a viable alternative to microwave communications for intersatellite and interplanetary links. Main characteristics are higher data rates, small size antenna telescopes with narrow beamwidths, but the drawback of the necessity for complex pointing, acquisition and tracking systems. After a review of some important technology aspects and modulation / detection schemes the optospecific link parameters axe discussed. An experimental coherent optical system set-up at DLR is described.
    • A New Method for Refinning Orbit of CPS Satellite Using Phase Measurement

      Sheng, Liu Dong; Beijing Institute of Satellite (International Foundation for Telemetering, 1990-11)
      This paper developed a new method of refinning GPS satellite orbit using phase measurement without knowing the GPS codes. Because this approach have no connection with any particular physical model, avoiding introducing any dynamic error, this method make it possible to get high precision GPS satellite orbit. A simulation computation has been conducted and gave an encouraging result.
    • GPS Translator Record and Interface System (TRIS)

      Danaher, James; Structured Systems & Software, Inc. (3S) (International Foundation for Telemetering, 1990-11)
      Global Positioning System (GPS) translator signals have been used to track U.S Navy Trident missile test launches for the past 15 years. Absolute position accuracies of better than 20 meters in real-time and 8 meters in post mission have been consistently demonstrated. Flight qualified GPS translators 40 cubic inches in size have been developed for the U.S. Army Exoatmospheric Re-entry Vehicle Interceptor Subsystem (ERIS) program and are currently available for use by U.S. and allied government test ranges. More widespread use of GPS translators is constrained, however, by the great expense and size of the custom ground equipment currently used to acquire GPS translator signals and compute the position and velocity of the vehicle. To address this problem, the U.S. Air Force Western Space and Missile Center (WSMC) placed 3S under contract to design a lower-cost GPS translator processor based mainly on using commercial telemetry equipment. This paper describes how a working prototype was constructed to demonstrate the feasibility of the Translator Record and Interface System (TRIS). This prototype shows that TRIS can be built from a combination of commercially-available telemetry equipment, GPS equipment developed for the U.S. Air Force Range Applications Joint Program Office (RAJPO), and a few elements of custom equipment.
    • IRIG-106 PCM IMPLEMENTATION UTILIZING CONSULTATIVE COMMITTEE FOR SPACE DATA SYSTEMS (CCSDS)

      Tubbs, Casey; SCI Technology, Inc. (International Foundation for Telemetering, 1990-11)
      Asynchronous data sources such as those associated with Space Based Radar create a unique problem for Time Division Multiplexed (TDM) Pulse Code Modulation (PCM) frame formats. The problem consists of data arrival based on external occurrences such as target tracking, and not due to sampling polls from internal sequencers. Reserved time slots for asynchronous data must be provided within the synchronous TDM telemetry stream. This increases the required bandwidth to transfer collected data to ground sites proportional to the worst case arrival rate of asynchronous data and the maximum latency allowed for the application. Asynchronous data is readily handled by the Consultative Committee for Space Data Systems (CCSDS) recommended formats without the need to increase the bandwidth disproportionately. The recommendation maintains the ability to provide synchronous telemetry data collection and transmission provided by the TDM PCM frame formats. This paper provides an implementation of CCSDS recommendations and addresses the methodology of merging asynchronous and synchronous data sources without the prerequisite increase in bandwidth associated with purely synchronous TDM approaches. Additional implementation details are provided for the implementation of a Telemetry Operation Procedure (TOP) to downlink error free telemetry frames. The TOP is not currently supported within the CCSDS recommendation. The implementation is provided through the Micro Packaged Data Acquisition and Control Systems developed by SCI Technology in Huntsville, Alabama.
    • An Advanced Commanding and Telemetry System

      Hill, Maxwell G. G. (International Foundation for Telemetering, 1990-11)
      The Loral Instrumentation System 500 configured as an Advanced Commanding and Telemetry System (ACTS) supports the acquisition of multiple telemetry downlink streams, and simultaneously supports multiple uplink command streams for today’s satellite vehicles. By using industry and federal standards, the system is able to support, without relying on a host computer, a true distributed dataflow architecture that is complemented by state-of-the-art RISC-based workstations and file servers.
    • PACKET TELEMETRY GROUND STATION SIMULATION

      Watson, John Calvin; New Mexico State University (International Foundation for Telemetering, 1990-11)
      The Packet Telemetry Ground Station which receives telemetry data from the Space Station must be able to receive and process various data types including high-rate video, audio, instrumentation, electronic mail, telecommand, and engineering. The Packet Telemetry Ground Station must also be flexible to accommodate changing missions and payloads. Computer simulations of the Packet Telemetry Ground Station provide information about device specifications required to achieve an acceptable level of performance under changing telemetry data traffic configurations. This paper describes a computer simulation model for a Packet Telemetry Ground Station Architecture which was tested using ten different traffic components randomly transmitting data. The Packet Telemetry Ground Station Simulation status and utilization plots are discussed in terms of interpreting the simulation results.