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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>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>PROBABILITY OF CYCLE JUMPS IN OMEGA RECEIVERS AND OTHER PHASE LOCKED LOOP APPLICATIONS; TECHNICAL REPT</title>
      <link>https://trid.trb.org/View/406138</link>
      <description><![CDATA[A study of cycle jumps in phase locked loops with a particular emphasis on Omega receivers is presented. Theoretical predictions using numerical integration of the probability density functions of the phase estimates for both Gaussian and more accurate atmospheric noise models are presented. These theoretical results are validated through computer and hardware simulations using both Gaussian and atmospheric noise.  Hard limited and linear receivers are considered along with various methods of phase estimate averaging. In addition, the combined effect of noise and errors in the velocity or phase estimate are presented.  The results relating the probability of cycle jumps to signal to noise ratio (SNR) show very pronounced thresholding in Gaussian Noise, i.e.  very small changes in SNR can mean the difference between acceptable and unacceptable probability of cycle jumps. This was found not to be true for atmospheric noise due to the significant number of outliers even for large SNR's. The data supports a conclusion that the lower limit on acceptable SNR for receiver operation is due to the probability of receiver cycle errors and not merely fix inaccuracy due to noise in lines of position.]]></description>
      <pubDate>Mon, 03 Oct 1994 00:00:00 GMT</pubDate>
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      <title>APPARATUS FOR SCANNING A ROTATING GYROSCOPE; PATENT</title>
      <link>https://trid.trb.org/View/406166</link>
      <description><![CDATA[An apparatus comprising, inter alia, gyroscope feed-back circuitry which allow scanning the rotor magnet of a gyroscope disposed in an associated guided missile system so as to increase the seeker field thereof is disclosed. A signal from the cage coil of the gyroscope having an amplitude approximating a sine function of the angular position of the spin axis of the rotor magnet portion of the gyroscope with respect to the body axis of the associated guided missile is used to generate a constant amplitude drive signal for driving the precession coil of the gyroscope. Scanning, so as to drive the rotor magnet in a predetermined scan pattern is accomplished by phase shifting the signal from the cage coil as a function of its amplitude and then driving the precession coil with the aforementioned constant amplitude drive signal which is phased- locked to the phase shifted or processed cage coil signal.]]></description>
      <pubDate>Mon, 03 Oct 1994 00:00:00 GMT</pubDate>
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      <title>RESULTS OF THE SECOND FLIGHT TEST OF THE LORAN-C RECEIVER/DATA COLLECTION SYSTEM</title>
      <link>https://trid.trb.org/View/88907</link>
      <description><![CDATA[The components of the Loran-C navigation system which were developed thus far are a phase-locked-loop receiver and a microcomputer development system. The microcomputer is being used as a means of testing and implementing software to handle sensor control and navigation calculations. Currently, the microcomputer is being used to collect and record data from the receiver in addition to development work. With these components, it was possible to record receiver data over a period of time and then reduce this data to obtain statistical information. It was particularly interesting to load the equipment developed in the laboratory into an aircraft and collect data while in flight. For initial flight tests, some important considerations were how well the entire system will perform in the field, signal strength levels while on the ground and in the air, the amount of noise present, changing of signal-to-noise ratio for various aircraft configurations and maneuvers, receiver overloading due to other equipment and antennas, and the overall usefulness of Loran-C as a navigation aid.]]></description>
      <pubDate>Mon, 15 Sep 1980 00:00:00 GMT</pubDate>
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      <title>THE DABS CALIBRATION PERFORMANCE MONITORING EQUIPMENT</title>
      <link>https://trid.trb.org/View/88995</link>
      <description><![CDATA[The Discrete Address Beacon System (DABS) Calibration Performance Monitor Equipment (CPME) is a special DABS transponder designed for installation at a fixed site visible to one or more DABS beacon sensors. The CPME is required for DABS sensor monopulse accuracy tests and for calibration of the sensor off-boresite azimuth look-up table. In addition, the CPME provides tests for DABS link integrity, by storing an uplink message and parroting it back upon command from the sensor. This document contains all information necessary to obtain a general understanding of the CPME system and its operation. Detailed information necessary for repair of the equipment is not contained in this document, but is supplied with each CPME system. (Author)]]></description>
      <pubDate>Mon, 15 Sep 1980 00:00:00 GMT</pubDate>
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