• A VALUABLE TOOL TO HAVE WHEN WORKING WITH PSK DEMODULATORS IS A KNOWLEDGE OF ITS FUNCTIONALITY

      Cylc, Linda; Aydin Telemetry (International Foundation for Telemetering, 1998-10)
      PSK demodulators have been an integral part of the signal recovery process for decades. Unless a person has designed a demodulator, how much can a person know or understand about its operation? Instruction on how to set up a demodulator’s parameters to acquire a signal is found in a manual. An explanation of why parameters are set a certain way to handle particular input signal characteristics is often not provided in a manual. This paper is designed to be a tool to aid engineers, technicians, and operators who utilize demodulators. Its purpose is to relay the functionality of a demodulator to a user so that he or she can take advantage of its control parameters and status feedback. Knowing the reasons why a demodulator is set to certain parameters may greatly reduce confusion when a system is not working properly. On site troubleshooting may be accomplished without the need to call the manufacturer of the product. Another advantage of understanding the operation will be recognized when interfacing with the manufacturer. A person will be able to relay the information to a design engineer more easily, and will understand more of the engineer’s feedback on the potential problem. Utilizing this paper as an aid to enhance operation of a PSK demodulator will bring a user one step closer to understanding the complexity of its design.
    • VEHICLE NAVIGATION & LOCATION SYSTEM BASED ON DGPS/INS/GIS INTEGRATED TECHNOLOGY

      Pingfang, Zheng; Qishan, Zhang; Lung, Cheng Lee; Beijing University of Aeronautics and Astronautics; City University of Hong Kong (International Foundation for Telemetering, 1998-10)
      With the rapid development of intelligent transport system in the world during the past few years, it promotes some navigation & location technology to a wide application especially in the car application. This paper firstly introduces some kinds of navigation & location systems and then analyzes the advantage and disadvantage of each system. On the basis of integrating every system and considering the high accuracy which can be achieved by adopting the technology based on DGPS (Differential Global Position System) at present, vehicle navigation & location system based on DGPS/INS/GIS integrated technology is put forward. The propound of this system shortens the distance between academic plan and real application greatly, and it provides a high accuracy and high reliability navigation & location system for traffic department and some car manufacturing Inc. In addition, this system is also provided with a friendly interface that makes it very easy to the manipulator or the user. The emphasis of this paper is put on the hardware and software of this system through introducing the system performance, the system component and the system software, and the characteristic of each module that makes up the whole system. The propound of the vehicle navigation & location system based on DGPS/INS/GIS integrated technology is a new attempt for development of intelligent transport system in our country, it will be sure to accelerate the process of our intelligent transport system.
    • VIDEO TELEMETRY AS A MILITARY TRAINING AID

      Prohaska, Thomas S.; Redstone Technical Test Center (International Foundation for Telemetering, 1998-10)
      Telemetry is usually thought of as a medium to transmit data to verify missile and equipment performance. Almost always the telemetry kit is tested to total destruction. Redstone Technical Test Center (RTTC) has developed several video telemetry kits for use as training aids. The military is training modern soldiers and pilots to use high dollar/tech weapons. When the gunner being trained makes an error and is not corrected, his/her bad behavior is reinforced. Aircraft carrying the TGM-65 MAVERICK do not have enough space for a human trainer. Training with the TGM-65 MAVERICK is performed by recording seeker video, then replaying it during the debriefing. The newly developed video telemetry system for the trainer allows experienced pilots to observe the training from the ground station and to provide immediate feedback to correct any errors. This paper focuses on the use of video telemetry as a training aid to provide quality training for servicemen.
    • WIDE-BAND RADIO FREQUENCY (RF) SOURCE SURVEILLANCE

      Gurr, J. Richard; Auvil, Anthony; Rizzo, Jim; Edwards Air Force Base (International Foundation for Telemetering, 1998-10)
      Reduction in available radio frequency (RF) spectrum for use in aircraft testing has steadily increased the probability of interference. The increase in users and required bandwidth generates requirements for increased monitoring and active management of the RF spectrum. The detection of background RF emissions and monitoring of authorized users will be used by future range test engineers to make decisions on when and where to conduct test missions to minimize the probability of interference. The detection of authorized users exceeding their allotted RF spectrum as well as unknown emitters should include: the general geographic area of potential interference, and times of transmission. This paper outlines the development of a complete system for wide-band RF monitoring to identify and locate active emissions. The RF surveillance system proposed must be inexpensive, easy to maintain, support large area coverage, and monitor wide bandwidths at long range. The system should contain software for emitter identification, which will determine where the current background and authorized RF transmissions occur and how they might effect authorized transmissions, and specialized software to alert spectrum managers of potential interference scenarios in real time based upon the daily schedule.
    • THE X-33 EXTENDED FLIGHT TEST RANGE

      Mackall, Dale A.; Sakahara, Robert; Kremer, Steven E.; National Aeronautics and Space Administration; Edwards Air Force Base (International Foundation for Telemetering, 1998-10)
      Development of an extended test range, with range instrumentation providing continuous vehicle communications, is required to flight-test the X-33, a scaled version of a reusable launch vehicle. The extended test range provides vehicle communications coverage from California to landing at Montana or Utah. This paper provides an overview of the approaches used to meet X-33 program requirements, including using multiple ground stations, and methods to reduce problems caused by reentry plasma radio frequency blackout. The advances used to develop the extended test range show other hypersonic and access-to-space programs can benefit from the development of the extended test range.
    • X-33 INTEGRATED TEST FACILITY EXTENDED RANGE SIMULATION

      Sharma, Ashley; National Aeronautics and Space Administration (International Foundation for Telemetering, 1998-10)
      In support of the X-33 single-stage-to-orbit program, NASA Dryden Flight Research Center was selected to provide continuous range communications of the X-33 vehicle from launch at Edwards Air Force Base, California, through landing at Malmstrom Air Force Base, Montana, or at Michael Army Air Field, Utah. An extensive real-time range simulation capability is being developed to ensure successful communications with the autonomous X-33 vehicle. This paper provides an overview of the various levels of simulation, integration, and test being developed to support the X-33 extended range subsystems. These subsystems include the flight termination system, L-band command uplink subsystem, and S-band telemetry downlink subsystem.
    • X-33 TELEMETRY BEST SOURCE SELECTION, PROCESSING, DISPLAY, AND SIMULATION MODEL COMPARISON

      Burkes, Darryl A.; Air Force Flight Test Center (International Foundation for Telemetering, 1998-10)
      The X-33 program requires the use of multiple telemetry ground stations to provide continuous coverage of the launch, ascent, re-entry and approach phases for flights from Edwards AFB, California, to landings at Dugway Proving Grounds, Utah, and Malmstrom AFB, Montana. This paper will discuss the X-33 telemetry requirements and design, including information on the fixed and mobile telemetry systems, automated best source selection system, processing/display support for range safety officers (RSO) and range engineers, and comparison of real-time data with simulated data using the Dynamic Ground Station Analysis model. Due to the use of multiple ground stations and short duration flights, the goal throughout the X-33 missions is to automatically provide the best telemetry source for critical vehicle performance monitoring. The X-33 program was initiated by National Aeronautics and Space Administration (NASA) Cooperative Agreement No. NCC8-115 with Lockheed Martin Skunk Works (LMSW).