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VOR Calibration Services

Description: from Introduction: The National Bureau of Standards has designed, constructed, and evaluated a standard for the support of very-high-frequency omnidirectional range (VOR) air navigation aids. The standard consists of two instruments: (1) a digital waveform signal generator for the composite VOR audio waveform, and (2) a standard phasemeter based on time series analysis of this waveform. Experimental results, a statistical analysis of them, and the principal software listings are included.
Date: April 1985
Creator: Larsen, Neil T.; Vecchia, Dominic F. & Sugar, George R.
Partner: UNT Libraries Government Documents Department
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Obstacle detection for autonomous navigation : an LDRD final report.

Description: This report summarizes the analytical and experimental efforts for the Laboratory Directed Research and Development (LDRD) project entitled 'Obstacle Detection for Autonomous Navigation'. The principal goal of this project was to develop a mathematical framework for obstacle detection. The framework provides a basis for solutions to many complex obstacle detection problems critical to successful autonomous navigation. Another goal of this project was to characterize sensing requirements in terms of physical characteristics of obstacles, vehicles, and terrain. For example, a specific vehicle traveling at a specific velocity over a specific terrain requires a sensor with a certain range of detection, resolution, field-of-view, and sufficient sensitivity to specific obstacle characteristics. In some cases, combinations of sensors were required to distinguish between different hazardous obstacles and benign terrain. In our framework, the problem was posed as a multidimensional, multiple-hypothesis, pattern recognition problem. Features were extracted from selected sensors that allow hazardous obstacles to be distinguished from benign terrain and other types of obstacles. Another unique thrust of this project was to characterize different terrain classes with respect to both positive (e.g., rocks, trees, fences) and negative (e.g., holes, ditches, drop-offs) obstacles. The density of various hazards per square kilometer was statistically quantified for different terrain categories (e.g., high desert, ponderosa forest, and prairie). This quantification reflects the scale, or size, and mobility of different types of vehicles. The tradeoffs between obstacle detection, position location, path planning, and vehicle mobility capabilities were also to be characterized.
Date: March 1, 2004
Creator: Padilla, Denise D.
Partner: UNT Libraries Government Documents Department
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The Validation of Interactive Computer Simulation Programs for Predicting On-Task Competencies for Inertial Navigation System Equipment

Description: This study investigated the predictive value of time on-task and error scores on tests administered through Control Data Corporation PLATO interactive computer graphics simulation as predictors of errors and time on-task for inertial navigation system equipment operation. In addition, the correlation between simulated pass/fail error and time on-task scores, and subsequent pass/fail criteria using actual equipment was investigated.
Date: May 1983
Creator: Hageman, Dwight C. (Dwight Conrad)
Partner: UNT Libraries
open access

Geophysical Flight Line Flying and Flight Path Recovery Utilizing the Litton LTN-76 Inertial Navigation System

Description: This report is a summary of tests performed with the LTN-76 designed to fly an airborne geophysical survey as well as to recover the subsequent flight path utilizing INS derived coordinates.
Date: November 1981
Creator: Mitkus, Alex F.; Carter, Dwight; Farmer, Patrick F. & Gay, S. Parker
Partner: UNT Libraries Government Documents Department
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Theoretical Investigation of the Performance of Proportional Navigation Guidance Systems-Effect of Method of Positioning the Radar Antenna on the Speed of Response

Description: Memorandum presenting a linear theoretical analysis of the performance of three proportional navigation guidance systems installed in a given supersonic, variable-incidence, boost-glide, antiaircraft missile at Mach numbers of 2.7 and 1.3. It is shown that, with the antenna stabilized in space, the effect of component lags on the response is small, so that the speed of response is small, so that the speed of response can be made to approach closely that of the airframe alone.
Date: August 13, 1952
Creator: Abramovitz, Marvin
Partner: UNT Libraries Government Documents Department
open access

Maps and Navigation Methods

Description: Different maps and scales are discussed with particular emphasis on their use in aviation. The author makes the observation that current navigation methods are slow and dangerous and should be replaced by scientific methods of navigation based on loxodromy and the use of the compass.
Date: March 1922
Creator: Duval, A.
Partner: UNT Libraries Government Documents Department
open access

The Installation and Correction of Compasses in Airplanes

Description: "The saving of time that results from flying across country on compass headings is beginning to be widely recognized. At the same time the general use of steel tube fuselages has made a knowledge of compass correction much more necessary than was the case when wooden fuselages were the rule. This paper has been prepared primarily for the benefit of the pilot who has never studied navigation and who does not desire to go into the subject more deeply than to be able to fly compass courses with confidence" (p. 1).
Date: August 1927
Creator: Schoeffel, M. F.
Partner: UNT Libraries Government Documents Department
open access

Practical Air Navigation

Description: This book was designed to use as a text on air navigation on private ground course of the Civilian Pilot Training Program, and is the fourth edition of the publication "Practical Air Navigation and the Use of Aeronautical Charts of the U.S. Coast and Geodetic Survey" by Thoburn C. Lyon.
Date: September 1940
Creator: Lyon, Thoburn C.
Partner: UNT Libraries Government Documents Department
open access

The Development of Loran-C Navigation and Timing

Description: From Abstract: "This work traces the development of the Loran-C concept from its inception as a 100-kHz pulse hyperbolic navigation system to more recent times when it found a variety of applications to both timing and navigation."
Date: October 1972
Creator: Hefley, Gifford
Partner: UNT Libraries Government Documents Department
open access

Astronomical Methods in Aerial Navigation

Description: The astronomical method of determining position is universally used in marine navigation and may also be of service in aerial navigation. The practical application of the method, however, must be modified and adapted to conform to the requirements of aviation. Much of this work of adaptation has already been accomplished, but being scattered through various technical journals in a number of languages, is not readily available. This report is for the purpose of collecting under one cover such previous work as appears to be of value to the aerial navigator, comparing instruments and methods, indicating the best practice, and suggesting future developments.
Date: 1925
Creator: Beij, K. Hilding
Partner: UNT Libraries Government Documents Department
open access

Aeronautic instruments. Section 6 : aerial navigation and navigating instruments

Description: This report outlines briefly the methods of aerial navigation which have been developed during the past few years, with a description of the different instruments used. Dead reckoning, the most universal method of aerial navigation, is first discussed. Then follows an outline of the principles of navigation by astronomical observation; a discussion of the practical use of natural horizons, such as sea, land, and cloud, in making extant observations; the use of artificial horizons, including the bubble, pendulum, and gyroscopic types. A description is given of the recent development of the radio direction finder and its application to navigation.
Date: 1923%
Creator: Eaton, H. N.
Partner: UNT Libraries Government Documents Department

Captain W.W. Withenbury's 1838-1842 Red River Reminiscences

Description: A selection of letters written to the Cincinnati Commercial newspaper from 1870-1871 about steamboat travel on the Red River in 1838-1841. W. W. Withenbury was a famous river boat captain during the mid-1800s. In retirement, he wrote a series of letters for the Cincinnati Commercial, under the title "Red River Reminiscences." Jacques Bagur has selected and annotated 39 letters describing three steamboat voyages on the upper Red River from 1838 to 1842. Withenbury was a master of character and incident, and his profiles of persons, including three signers of the Texas Declaration of Independence, reflect years of acquaintance. The beauty of his writing ranks this among the best of the reminiscences that were written as the steamboat era was declining. “Bagur is an expert on the Red River in the nineteenth century, and it shows in this work. Informative and entertaining.” —Randolph B. "Mike" Campbell, author of Gone to Texas: A History of the Lone Star State “This will rank as a great assistance to researchers if anyone wants to attack history of the Red River again. Some of his in-depth research was fabulous.”—Skipper Steely, author of Red River Pioneers
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: April 2014
Creator: Bagur, Jacques D.
Partner: UNT Press
open access

Marine and Hydrokinetic Renewable Energy Devices, Potential Navigational Hazards and Mitigation Measures

Description: On April 15, 2008, the Department of Energy (DOE) issued a Funding Opportunity Announcement for Advanced Water Power Projects which included a Topic Area for Marine and Hydrokinetic Renewable Energy Market Acceleration Projects. Within this Topic Area, DOE identified potential navigational impacts of marine and hydrokinetic renewable energy technologies and measures to prevent adverse impacts on navigation as a sub-topic area. DOE defines marine and hydrokinetic technologies as those capable of utilizing one or more of the following resource categories for energy generation: ocean waves; tides or ocean currents; free flowing water in rivers or streams; and energy generation from the differentials in ocean temperature. PCCI was awarded Cooperative Agreement DE-FC36-08GO18177 from the DOE to identify the potential navigational impacts and mitigation measures for marine hydrokinetic technologies. A technical report addressing our findings is available on this Science and Technology Information site under the Product Title, "Marine and Hydrokinetic Renewable Energy Technologies: Potential Navigational Impacts and Mitigation Measures". This product is a brochure, primarily for project developers, that summarizes important issues in that more comprehensive report, identifies locations where that report can be downloaded, and identifies points of contact for more information.
Date: December 1, 2009
Creator: Cool, Richard, M.; Hudon, Thomas, J.; Basco, David, R. & Rondorf, Neil, E.
Partner: UNT Libraries Government Documents Department
open access

Use of Dredger in Improving Channel of Coos Bay, Oregon, Report

Description: Report of the Committee on Commerce detailing the opinions and recommendations of the Committee on the proposed Senate resolution 55 authorizing the use of a dredger in the improving the channel of Coos Bay, Oregon. It includes a report of the War Department on the proposed legislation.
Date: 1908~
Creator: United States. Congress. Senate. Committee on Commerce
Partner: UNT Libraries Government Documents Department
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Widening Channel of Michigan City Harbor, Indiana, Report

Description: Report of the Committee on Commerce detailing the opinions and recommendations of the Committee on the proposed Senate resolution 79 to authorize the widening of the channel of Michigan City Harbor, Indiana. It includes a report of the War Department on the proposed legislation.
Date: 1908~
Creator: United States. Congress. Senate. Committee on Commerce
Partner: UNT Libraries Government Documents Department
open access

Global positioning system pseudolite-based relative navigation.

Description: Though the Global Positioning System has revolutionized navigation in the modern age, it is limited in its capability for some applications because an unobstructed line of sight to a minimum of four satellites is required. One way of augmenting the system in small areas is by employing pseudolites to broadcast additional signals that can be used to improve the user's position solution. At the Navigation Systems Testing Laboratory (NSTL) at NASA's Johnson Space Center in Houston, TX, research has been underway on the use of pseudolites to perform precision relative navigation. Based on the findings of previous research done at the NSTL, the method used to process the pseudolite measurements is an extended Kalman filter of the double differenced carrier phase measurements. By employing simulations of the system, as well as processing previously collected data in a real time manner, sub-meter tracking of a moving receiver with carrier phase measurements in the extended Kalman filter appears to be possible.
Date: March 2004
Creator: Monda, Eric W.
Partner: UNT Libraries Government Documents Department
open access

Theoretical Investigation of the Performance of Proportional Navigation Guidance Systems: Effect of Method of Positioning the Radar Antenna on the Speed of Response

Description: Memorandum presenting a linear theoretical analysis made of the performance of three proportional navigation guidance systems installed in a given supersonic, variable-incidence, boost-glide, antiaircraft missile at Mach numbers of 2.7 and 1.3. Three guidance systems are compared on the basis of the maximum obtainable speed of response of the missile and guidance-system combination consistent with adequate stability. Results regarding the effect of method of positioning the radar antenna on the speed of response, effect of Mach number on response, and effect of networks are provided.
Date: August 13, 1952
Creator: Abramovitz, Marvin
Partner: UNT Libraries Government Documents Department
open access

Model Study of Channel Improvement and Stabilization in the Pryors Island Reach of the Ohio River

Description: This technical memorandum constitutes a complete report on a model study of the Pryors Island reach of the Ohio River, made for the purpose of determining the most effective plan of regulating works for the further improvement and stabilization of the navigable channel.
Date: September 1, 1938
Creator: Waterways Experiment Station (U.S.)
Partner: UNT Libraries Government Documents Department
open access

Model Study of Plans for Channel Improvement at Dogtooth Bend, Mississippi River, Folder 1

Description: This memorandum, constitutes a report on the results of experiments conducted at the U. S. Waterways Experiment Station on a small scale model of that reach of the Mississippi River near and including Dogtooth Bend (Mile 32.7 above to Mile 4.0 below Cairo).
Date: April 2, 1938
Creator: Waterways Experiment Station (U.S.)
Partner: UNT Libraries Government Documents Department
open access

The effects of target and missile characteristics on theoretical minimum miss distance for a beam-rider guidance system in the presence of noise

Description: Report presenting a study to determine the relative importance of the factors that place an inherent limitation on the minimum obtainable miss distance for a beam-rider navigation system operating in the presence of glint noise and target evasive maneuver. The factors considered include missile natural frequencies and damping ratios, missile steady-state acceleration capabilities, target evasive maneuver characteristics, and angular scintillation noise characteristics.
Date: February 10, 1958
Creator: Stewart, Elwood C.; Druding, Frank & Nishiura, Togo
Partner: UNT Libraries Government Documents Department
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