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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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      <title>THE TRANSPORTABLE MEASUREMENTS FACILITY (TMF) SYSTEM DESCRIPTION</title>
      <link>https://trid.trb.org/View/162233</link>
      <description><![CDATA[This report describes the MIT Lincoln Laboratory Transportable Measurements Facility (TMF), a special purpose beacon interrogator patterned after the Discrete Address Beacon Sensor. This van-mounted experimental beacon system includes all ATCRBS/DABS reply processing and monopulse processing, but not other DABS processing. It was developed to collect data at various locations in the United States so that candidate DABS sensor antenna and processing could be evaluated in a real environment. The TMF has been installed and operated at: Logan Airport (Boston); Deer Island, MA (near Logan); Washington National Airport (DCA); Philadelphia Int. Airport (PHL); Clementon, NJ (near Philadelphia); Los Angeles Int. Airport (LAX); Brea, CA(25 miles east of LAX); Salt Lake City, UT (SLC); Layton, UT (near Salt Lake City); Las Vegas Airport (LAS); Green Airport, Warwick, RI. (Author)]]></description>
      <pubDate>Wed, 11 Dec 2002 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/162233</guid>
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      <title>ALTERNATE WAVEFORMS FOR A LOW-COST CIVIL GLOBAL POSITIONING SYSTEM RECEIVER</title>
      <link>https://trid.trb.org/View/162199</link>
      <description><![CDATA[This report examines the technical feasibility of alternate waveforms to perform the GPS functions and to result in less complex receivers than is possible with the GPS C/A waveform. The approach taken to accomplish this objective is (a) to identify, after a quick broad overview, a few promising waveforms, (b) to complete the architectural synthesis of a GPS system based on the new waveforms, (c) to analyze the performance of these systems in providing ranging and communication capability and (d) to assess the impact on receiver hardware and software. One conclusion is that the class of pulsed waveform, when combined with emerging matched filter technology, permits the use of a greatly simplified receiver design. A major part of the report consists of description of a pulse-based GPS design. Although very specific, the design was intended as a vehicle for performance analysis only and many refinements and alternatives within the same class are possible. Other classes of waveforms such as tone ranging and chirped FM waveforms, although adequate, do not seem superior to the present PN encoded CW waveform for GPS. Finally, if the 'alternate' waveform is simply the present C/A waveform but with a substantially increased power level, it is shown that with the present designs the performance will be greatly increased or, alternatively, performance margin can be traded for a simplified receiver implementation. (Author)]]></description>
      <pubDate>Wed, 11 Dec 2002 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/162199</guid>
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      <title>FAA LIGHTNING PROTECTION STUDY: CIRCUIT MODIFICATIONS FOR MARK III INSTRUMENT LANDING SYSTEM TO PREVENT OPERATIONAL UPSETS DUE TO ELECTRICAL TRANSIENTS ON CABLES</title>
      <link>https://trid.trb.org/View/41507</link>
      <description><![CDATA[The circuits of the Mark 3 Instrument Landing System which are susceptible to false actuation due to electrical transients on interconnecting electrical cables are identified. The effects of the transients on system operation are analyzed. The circuit modifications required to prevent operational upsets due to transients are presented. The points of entry of surges on AC power lines in the system are identified.]]></description>
      <pubDate>Sat, 13 Jul 2002 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/41507</guid>
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    <item>
      <title>DIGITIZED RADAR DATA COMPRESSOR</title>
      <link>https://trid.trb.org/View/75610</link>
      <description><![CDATA[The data compressor (DACOMP) is a special-purpose device designed specifically to increase radar data recording capabilities at air route traffic control centers (ATRCC's). The DACOMP accomplishes this by compressing the number of channels each radar occupies prior to recording, thereby reducing the number of tape tracks required for each radar. The three 2400 bit-per-second channels of a digitized radar are compressed onto one high-speed (9375 bit-per-second) channel. Because of the threefold reduction in recording track requirements, use of DACOMP's will enable ARTCC's to record information from an increased number of radar sites on the recorders that are available to them. This report explains the installation, use, theory of operation, and maintenance of the DACOMP. (Author)]]></description>
      <pubDate>Tue, 31 Oct 2000 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/75610</guid>
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      <title>COMPUTER MODEL SIMULATION OF NULL-FLUX MAGNETIC SUSPENSION AND GUIDANCE</title>
      <link>https://trid.trb.org/View/368985</link>
      <description><![CDATA[This paper discusses the magnetic force computations in a null-flux suspension system using dynamic circuit theory.  A computer simulation model that can be used to compute magnetic forces and predict the system performance is developed on the basis of dynamic circuit theory.  Numerical examples are presented to demonstrate the application of the model.  The performance of the null-flux suspension system is simulated and discussed.]]></description>
      <pubDate>Sat, 30 Jan 1993 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/368985</guid>
    </item>
    <item>
      <title>DOCUMENTATION OF DESIGN, PERFORMANCE, AND QUALIFICATION OF THE SES WAVE PROFILING SYSTEM</title>
      <link>https://trid.trb.org/View/162385</link>
      <description><![CDATA[This report describes the design, calibration, and laboratory qualification testing of the complete motion-compensated wave profiling system (except for the altimeter) as installed on the high-speed surface effect ship, the SEA-100A. It also describes the detailed design and analysis of the strapdown inertial motion compensation system used to remove vehicle motion from the altimeter signal. The system is necessary to achieve real-time on-board wave profiling. (Author)]]></description>
      <pubDate>Wed, 18 Feb 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/162385</guid>
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    <item>
      <title>MONITORING OF LNG VAPORS - PHASE I</title>
      <link>https://trid.trb.org/View/144175</link>
      <description><![CDATA[This report documents the development and subsequent field testing of two rapid response instruments for the detection of methane gas in the vapor resulting from an LNG spill. The instruments were: a laser instrument with a 0.005 second response time and 0.1% sensitivity, and a two-band differential radiometer (TBDR) with a 0.15 second response time and 1% sensitivity. A thermistor sensor was also developed for the rapid (0.2 second) measurement of vapor temperature. The implementation of this instrumentation for Spill Tests LNG-18, LNG-19, LNG-20 and LNG-21 at China Lake, California is also described in this report. Some comparisons were made between the JPL measurements and those of other organizations involved in the China Lake test program. Good correlation was found, for example, between the laser methane measurement and that of a nearby sensor during LNG-18. During LNG-21 the vapor temperature of methane was also measured and found to be linearly related to the methane concentration over the 2-10% range. In addition to the two methane concentration instruments, progress in the laboratory associated with this program was made on the development of a modified TBDR device to measure the concentration of oxygen in the vapor cloud, and in the development of infrared fiber-optics for advanced laser detection of methane and other species. (Author)]]></description>
      <pubDate>Mon, 31 Mar 1980 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/144175</guid>
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      <title>DIPOLE BROADSIDE GLIDE SLOPE ARRAY</title>
      <link>https://trid.trb.org/View/143993</link>
      <description><![CDATA[This report describes the analysis and design, and the fabrication and test of an improved glide slope antenna system. It is capable of providing CAT II performance over level ground, rising ground, and severe broken ground associated with problem sites. It is broadband and can operate at any ILS glide slope frequency with no special tuning. A new monitoring technique was developed which is applicable to any antenna system consisting of a large number of radiators. The report contains the results of antenna range measurements and flight check data taken at a typical site. (Author)]]></description>
      <pubDate>Mon, 11 Feb 1980 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/143993</guid>
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    <item>
      <title>STUDY PROGRAM FOR ANALYZING DATA HANDLING CAPABILITY OF A 240 HZ. SLOT WITHIN A NORMAL VOICE BAND</title>
      <link>https://trid.trb.org/View/82740</link>
      <description><![CDATA[The program covered a research phase as well as a laboratory testing phase, to determine the feasibility of handling data in a 240 Hz slot within the normal voice band over an unconditioned 3002 transmission line. The goals were to determine the maximum data rate and the effects on voice quality. The maximum data error rate was specified as .0001, which included choosing a mod./demod. technique, and the design of filters for notching the voice band and bandpassing the data. Both theoretical and practical aspects of implementing a data slot technique are discussed, along with schematics, tables, and graphs illustrating filter, modulation, and theoretical characteristics of the applied technique. (Author)]]></description>
      <pubDate>Fri, 11 May 1979 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/82740</guid>
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