<rss version="2.0" xmlns:atom="https://www.w3.org/2005/Atom">
  <channel>
    <title>Transport Research International Documentation (TRID)</title>
    <link>https://trid.trb.org/</link>
    <atom:link href="https://trid.trb.org/Record/RSS?s=PHNlYXJjaD48cGFyYW1zPjxwYXJhbSBuYW1lPSJkYXRlaW4iIHZhbHVlPSJhbGwiIC8+PHBhcmFtIG5hbWU9InN1YmplY3Rsb2dpYyIgdmFsdWU9Im9yIiAvPjxwYXJhbSBuYW1lPSJ0ZXJtc2xvZ2ljIiB2YWx1ZT0ib3IiIC8+PHBhcmFtIG5hbWU9ImxvY2F0aW9uIiB2YWx1ZT0iMCIgLz48L3BhcmFtcz48ZmlsdGVycz48ZmlsdGVyIGZpZWxkPSJpbmRleHRlcm1zIiB2YWx1ZT0iJnF1b3Q7RGF0YSByYXRlJnF1b3Q7IiBvcmlnaW5hbF92YWx1ZT0iJnF1b3Q7RGF0YSByYXRlJnF1b3Q7IiAvPjwvZmlsdGVycz48cmFuZ2VzIC8+PHNvcnRzPjxzb3J0IGZpZWxkPSJwdWJsaXNoZWQiIG9yZGVyPSJkZXNjIiAvPjwvc29ydHM+PHBlcnNpc3RzPjxwZXJzaXN0IG5hbWU9InJhbmdldHlwZSIgdmFsdWU9InB1Ymxpc2hlZGRhdGUiIC8+PC9wZXJzaXN0cz48L3NlYXJjaD4=" rel="self" type="application/rss+xml" />
    <description></description>
    <language>en-us</language>
    <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>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
      <url>https://trid.trb.org/Images/PageHeader-wTitle.jpg</url>
      <link>https://trid.trb.org/</link>
    </image>
    <item>
      <title>Development of Reliable V2V System Based on WAVE</title>
      <link>https://trid.trb.org/View/1362103</link>
      <description><![CDATA[This paper proposes a dynamic congestion control algorithm for a reliable message transmission in vehicle-to-vehicle (V2V) communication environment based on IEEE 802.11p WAVE (Wireless Access in Vehicle Environment) technology. Each vehicle periodically exchanges its status information like a position, speed and brake control with other vehicles within a communication range. Without any control, each vehicle always uses the maximum transmitting power and data rate. From the authors' experiments, at heavy traffic flow, the higher transmitting power and the higher data rate make the wireless channel contentions and packet collisions more serious. In this paper, the authors propose the mean-based dynamic data rate control algorithm and the phase control using Epoch to mitigate the congestion. The performance evaluations in Qualnet confirm that the proposed algorithm achieves better communication performance than the existing solutions and is more robust to the hidden terminal problems.]]></description>
      <pubDate>Tue, 21 Jul 2015 16:15:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/1362103</guid>
    </item>
    <item>
      <title>Entwicklung einer flaechendeckenden dynamischen Verdichtungskontrolle (FDVK) fuer Plattenverdichter</title>
      <link>https://trid.trb.org/View/945833</link>
      <description><![CDATA[Im Beitrag werden die Methode M2 der ZTV-EStB (Zusaetzliche Technische Vertragsbedingungen und Richtlinien fuer Erdarbeiten im Strassenbau), die flaechendeckende dynamische Verdichtungskontrolle (FDVK) und das Geomessverfahren fuer Vibrationsplatten vorgestellt. Die Entwicklung einer FDVK fuer Plattenverdichter stellt neben der bekannten FDVK fuer Walzenzuege eine neue Entwicklungsstufe der Geomesstechnik dar. Auf der Grundlage eines umfangreichen Versuchsprogramms wurden aus dem Bodenverdichtungswert der Messtechnik des Plattenverdichters bodenmechanische Parameter, wie E(Index v)-Werte und der Verdichtungsgrad D(Index Pr), abgeleitet. Im Beitrag werden ausserdem die theoretischen und messtechnischen Grundlagen vorgestellt.]]></description>
      <pubDate>Thu, 07 Oct 2010 11:47:50 GMT</pubDate>
      <guid>https://trid.trb.org/View/945833</guid>
    </item>
    <item>
      <title>Verdichtungsanforderungen bei Erdarbeiten im Strassenbau: nationale und internationale Erfahrungen</title>
      <link>https://trid.trb.org/View/942850</link>
      <description><![CDATA[Im Rahmen der Forschungsarbeit wurden Anforderungen und Pruefmethoden in internationalen Regelwerken gesammelt, ausgewertet und miteinander verglichen. Dabei wurden sowohl die in internationalen Regelwerken angegebenen Anforderungen an den Verdichtungsgrad und den Verformungsmodul als auch die Art der vorgeschriebenen Ueberpruefung erfasst. Die vorliegende Forschungsarbeit beinhaltet neben dem Regelwerk Deutschlands Richtlinien zu Anforderungen an Verdichtungskenngroessen und Pruefverfahren von 11 europaeischen und 4 Laendern aus Uebersee. Im Vergleich der internationalen Regelwerke mit den in Deutschland gueltigen Regelwerken kann zusammenfassend festgehalten werden, dass die Regelwerke von Deutschland, Oesterreich, Schweden und Norwegen umfassend und gut gegliedert sind. Die Regelwerke anderer Laender sind bezueglich der Uebersichtlichkeit schwieriger handhabbar. Nur im deutschen, oesterreichischen und schwedischen Regelwerk sind Richtlinien zur Flaechendeckenden Verdichtungskontrolle (FDVK) angegeben. Des Weiteren wurde ein Versuchsteil mit drei Versuchsfeldern zur Aufstellung von Korrelationen zwischen verschiedenen Pruefmerkmalen durchgefuehrt. Die Auswertung erfolgte nach dem Fehler-in-den-Variablen-Verfahren. Aus den Ergebnissen werden Vorschlaege fuer eine Ueberarbeitung der erdbautechnischen Regelwerke abgeleitet.]]></description>
      <pubDate>Thu, 07 Oct 2010 10:30:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/942850</guid>
    </item>
    <item>
      <title>A Case for Higher Data Rates</title>
      <link>https://trid.trb.org/View/843824</link>
      <description><![CDATA[Flight data recorders required to support aviation accident investigations have benefited from numerous advances in recorder technology. These numerous technology advances for the most part have been directed at increasing the number of recorded parameters, improving the recording media, and improving reliability, maintainability, survivability and recovery characteristics. While these several aspects of the recorders have been improved, there has not been an associated increase in the once-per-second (1.0 Hz.) rate at which the flight data is recorded for accident analysis. This once-per-second rate has persisted in spite of the fact that technology advances could support much higher data rates, as demonstrated by rates of 20 to 100 data points per second (20 to 100 Hz) of current flight test data recordings. The need for a data rate above one data point per second evidently has not been conclusively established for accident analysis. While the aviation accident rate is rewardingly low, the aviation accident rate has remained stubbornly unchanged for the past two decades in spite of the billions of dollars invested for safety improvement. The following review of the accident data for the most recent ten-year period for which data is available, may provide some insight as to a potential reason for our inability to further improve our aviation accident rate. During the period from 1988 through 1997, the worldwide commercial jet fleet experienced 213 hull loss accidents. For 105 of these accidents, or 49% of the total accidents, the “flight crew” was listed as the primary causal factor. An additional 64 accidents, or 30%, listed “unknown” as the primary causal factor. These statistics indicate that nearly 80% of the hull loss accidents for the most recent ten year period are the results of causal factors for which there is incomplete understanding of exactly what problems need to be solved. Can there be a credible expectation for reducing the accident rate by 80% within ten years when 80% of the causal factors aren’t well understood? The intent of this paper is to demonstrate the need, and argue for the establishment of data rate requirements at least an order of magnitude greater than today’s requirements for selected parameters under particular conditions, and to describe the potential benefits that would be derived from the increased data rates.]]></description>
      <pubDate>Wed, 30 Jan 2008 12:31:01 GMT</pubDate>
      <guid>https://trid.trb.org/View/843824</guid>
    </item>
    <item>
      <title>DISCRETE ADDRESS BEACON SYSTEM DATA LINK CAPACITY REQUIREMENTS</title>
      <link>https://trid.trb.org/View/170492</link>
      <description><![CDATA[The Federal Aviation Administration plans to deploy the Discrete Address Beacon System (DABS) as a key feature of its upgraded third generation Air Traffic Control System. DABS provides an integral data link capable of conducting rapid transfer of data between the sensor and DABS equipped aircraft. This study establishes the performance requirements of the DABS data link to be able to provide the various services that may reasonably be expected to be delivered by DABS during its life time.]]></description>
      <pubDate>Tue, 28 Oct 2003 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/170492</guid>
    </item>
    <item>
      <title>COMMUNICATIONS SUPPORT FOR NATIONAL FLIGHT DATA CENTER INFORMATION SYSTEM</title>
      <link>https://trid.trb.org/View/162748</link>
      <description><![CDATA[The National Flight Data Center/Information System (NFDC/IS) data communications requirements were analyzed to determine the technical feasibility and the most cost beneficial approach of NADIN support. The following conclusions were made: The most cost/beneficial approach to NADIN support of the NFDC/IS data communications requirements provides for the use of NADIN for interactive and message traffic and dedicated facilities for the point-to-point, source-to-sink batch traffic. The most significant aspect of NADIN support for the NFDC/IS data communications requirements is in providing the communications link between the NFDC host system and the external systems with which it must interface. (Author)]]></description>
      <pubDate>Tue, 15 Apr 2003 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/162748</guid>
    </item>
    <item>
      <title>ANALYSIS OF A NONLINEAR ALTITUDE TRACKING METHOD</title>
      <link>https://trid.trb.org/View/171700</link>
      <description><![CDATA[This report analyzes the performance of the nonlinear altitude tracker developed for the Active Beacon Collision Avoidance System (BCAS) by Lincoln Laboratory. The tracker is intended for use in the collision avoidance logic of the BCAS system. The nonlinear tracker performance was characterized through comparisons with the previous altitude tracker. The original tracker, used by the collision avoidance logic, was a simplistic alpha-beta tracker. The nonlinear tracker performance evaluation was conducted in three phases: (1) The stand-alone error characteristics of the tracker were obtained. Simulated mode C report sequences were provided directly to the tracker. (2) The nonlinear tracker was integrated directly into the collision avoidance logic. With the use of the Fast-Time Encounter Generator (FTEG), a comparative study of performance with the nonlinear tracker versus the alpha-beta tracker was made. (3) Selected live flight test encounters were used to analyze the relative performance of the alpha-beta tracker versus the nonlinear tracker. The stand-alone analysis revealed that the nonlinear tracker consistently had smaller maximal errors in vertical rate estimation and a smaller transient rate response delay than did the alpha-beta tracker. Both the live flight test encounter simulations and the FTEG scenario simulation indicated that nonlinear tracking often caused an increase in separation for encounters with vertically accelerating threats and reduced occurrences of incorrect command sense choice. (Author)]]></description>
      <pubDate>Sun, 30 Mar 2003 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/171700</guid>
    </item>
    <item>
      <title>EVALUATION OF A RADAR MOVING TARGET EXTRACTOR (MOTE)</title>
      <link>https://trid.trb.org/View/82625</link>
      <description><![CDATA[This report contains performance results of a velocity filter, identified as a moving target extractor(MOTE), to minimize excessive radar return data rates from weather clutter with minimum reduction target detection criteria. The MOTE, part of a special processor, was operated in conjunction with the common digitizer(CD) equipment at Elwood, New Jersey. Tests of search radar report data, with and without the filter, employed clear-air and weather tapes which were processed by computer programs for comparison. An additional MOTE design, providing for enhancement of target detection, was tested with a limited number of sample weather tapes. Results of tests with low-intensity weather data showed a reduction in target detection of 4 percent, while false targets were reduced by 41 prercent. Test results from high-intensity weather data showed a reduction in target detection of 15 percent with false target reduction of 44 percent. (Author)]]></description>
      <pubDate>Thu, 25 Apr 2002 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/82625</guid>
    </item>
    <item>
      <title>SPREAD SPECTRUM APPLICATIONS FOR SURFACE TRANSPORTATION</title>
      <link>https://trid.trb.org/View/486781</link>
      <description><![CDATA[This paper is an introduction to the world of spread spectrum radio.  It provides some comparisons of various spread spectrum radio technologies for use in the urban environment.  In particular, it addresses some demonstrations and experiments conducted by ARINC in the past 12 months using both 900-MHz and 2,400-MHz units for data communications.  These results of those demonstrations were better than expected on the Mississippi River in the New Orleans downtown area.  Trade-offs for using spread spectrum radios in the transit environment are discussed together with advantages and disadvantages of their use. The paper also addresses the criteria for various transit applications and some of the pitfalls to be avoided in the selection of operating parameters, especially when multiple radios are used nearby.  A comparison of the use of directional and omnidirectional antennas with trade-offs for allowed radiated power is also discussed.  The alternatives of data rate and bandwidth versus range and reliability are shown as the classic trade-off for performance.  Although this paper is not intended as a primer for spread spectrum radio, the fundamentals and principles are covered as an integral part of understanding the problems inherent in their use.]]></description>
      <pubDate>Fri, 12 Jun 1998 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/486781</guid>
    </item>
    <item>
      <title>FIELD TESTING ON THE ITS 220 MHZ NARROWBAND CHANNELS</title>
      <link>https://trid.trb.org/View/574808</link>
      <description><![CDATA[This report highlights recent field test results for a narrowband digital wireless modem designed to operate on the Intelligent Transportation System (ITS) 220 MHz channels.  A prototype modem has been designed and constructed which achieves data rates of 12.8 kbps over a mobile link and 21.4 kbps over a fixed point link.  Recent enhancements and field testing results are presented.]]></description>
      <pubDate>Fri, 14 Nov 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/574808</guid>
    </item>
    <item>
      <title>DIGITAL MULTIMEDIA BROADCASTING TRANSMISSION OF VIDEO AND HIGH DATA RATE SIGNALS INTO MOVING AREAS</title>
      <link>https://trid.trb.org/View/574715</link>
      <description><![CDATA[Surveys have revealed that highly mobile people nowadays are most interested in having the services they use at home or at the office available to them while on the road, too.  The widespread use of paging and mobile phones proves this - or the well established reception of AM and FM radio broadcasting in motorcars.  In towns or hilly areas, the terrestrial transmission of voice or music into moving vehicles suffers sometimes from interference effects due to multipath propagation: the signal is fading, and the amplitude of the reproduced sound may oscillate or sometimes even vanish.  This is disturbing despite the fact that most often the human ear helps to smooth.  It integrates and levels off effects of less than about 20 ms duration.  But even if the voice is rather well received, the transmission of signals which are sensitive to short dropouts and interference effects often give poor results. A fax transmitted via the same audio channel may be blurred from horizontal dark lines if dropouts just cancelled those bits which control the line synchronization.  The reception of TV signals is even worse if there is some multipath propagation; line and frame synchronization get unstable, the color disappears from time to time, the picture becomes unclear from ghosts. Obviously, the international standards for analog TV distribution (NTSC, PAL, SECAM) are totally inadequate to transmit television into fast moving vehicles or even to portable television sets while they are carried around. Consequently, up to now the mobile user cannot be served with TV or any high data rate digital service.  So, a totally new transmission scheme has to be applied.  The authors found a multi-tiered solution which masters the problems: digitization and strong data compression of audio and video signals; transmissions using a modulation which is insensitive to multipath propagation (COFDM = Coded Orthogonal Frequency Division Multiplexing); use of unoccupied frequencies (taboo channels) within the broadcast bands which is possible because then the COFDM modulation does not disturb the established television programs; and receivers for the users which allow reception and decoding of these new types of signals.  This is basically an extension of the Digital Studio Broadcasting (DAB), a new radio system specifically developed to serve the mobile user.  A television channel is divided in blocks of 1.5 MHz bandwidth each.  Every block can then transport a gross data rate of up to 2.3 Mbit/s.  Error protection reduces this to about 1.7 Mbit/s.  For audio transmission this data rate is then split into 6 audio channels each of 392 kbit/s.  The audio compression according to ISO MPEG 11172 is so well performing as to allow then a sound reproduction comparable to the quality of CD.  The modulation scheme makes the wireless transmission as good and secure as through a wired line.]]></description>
      <pubDate>Fri, 24 Oct 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/574715</guid>
    </item>
    <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>
    </item>
    <item>
      <title>THE IMPACT OF MICROCOMPUTERS ON AVIATION: A TECHNOLOGY FORECASTING AND ASSESSMENT STUDY. VOLUME II. CONSTRAINED FORECASTS AND ASSESSMENT OF MICROCOMPUTER TECHNOLOGY</title>
      <link>https://trid.trb.org/View/57852</link>
      <description><![CDATA[The study of the impact of microcomputers on aviation consists of two parts. The first part, technological forecasting of microcomputers, with specific reference to aviation applications, has been reported in Volume I. This volume (Volume II) presents the results of technology assessment of microcomputers, with special emphasis on the impacts of microcomputers, with special emphasis on the impacts of microcomputers on the National Aviation System (NAS), and their policy implications. (Author)]]></description>
      <pubDate>Tue, 14 Mar 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/57852</guid>
    </item>
    <item>
      <title>DATA LINK SUBSYSTEM LABORATORY TESTS</title>
      <link>https://trid.trb.org/View/47587</link>
      <description><![CDATA[Various very high frequency (VHF) transmitter-receiver combinations were used with minimum shift key (MSK) modems for bit error rate tests at 2400 and 4800 bit/second (b/s) rates and at various radiofrequency (RF) noise density levels over a simulated RF digital data link. Results indicated that to obtain the same bit error rate performance, the energy to noise (E/No) requirements differed up to 3.5 dB at 2400 b/s and up to 6 dB at 4800 b/s for the various transmitter-receiver combinations in the ground/air channel. (Author)]]></description>
      <pubDate>Wed, 30 Mar 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/47587</guid>
    </item>
    <item>
      <title>MICROWAVE LANDING SYSTEM (MLS) DEVELOPMENT PLAN AS PROPOSED BY TEXAS INSTRUMENTS, INC. DURING THE TECHNIQUE ANALYSIS AND CONTRACT DEFINITION PHASE OF THE NATIONAL MLS DEVELOPMENT PROGRAM. VOLUME VIII. APPENDIX F1</title>
      <link>https://trid.trb.org/View/23496</link>
      <description><![CDATA[The volume presents the angle data rate study of the flight factor studies.]]></description>
      <pubDate>Tue, 22 Apr 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/23496</guid>
    </item>
  </channel>
</rss>